Entries |
Document | Title | Date |
20080198773 | System and method for transmitter leak-over cancellation - The present disclosure relates generally to systems and methods for transmitter leak-over cancellation. In one example, a method includes transmitting a signal via a transmit chain in a wireless device, where a portion of the signal leaks over into a receive chain of the wireless device and generates higher order products that interfere with a signal being received by the wireless device. A portion of the signal from the transmit chain is diverted into cancellation circuitry coupled to the receive chain prior to a location in the transmit chain where leak-over occurs, and an amplitude and phase of the portion is manipulated. The manipulated portion is combined with the received signal and other portion to at least partially cancel interference caused by the portion leaking over into the receive chain. | 08-21-2008 |
20080259825 | METHOD AND APPARATUS FOR PERFORMING JRNSO IN FDD, TDD AND MIMO COMMUNICATIONS - A method and apparatus for performing Joint Randomness Not Shared by Others (JRNSO) is disclosed. In one embodiment, JRNSO is determined in Frequency Division Duplex (FDD) using a baseband signal loop back and private pilots. In another embodiment, JRNSO is determined in Time Division Duplex (TDD) using a baseband signal loop back and combinations of private pilots, private gain functions and Kalman filtering directional processing. In one example, the FDD and TDD JRSNO embodiments are performed in Single-Input-Single-Output (SISO) and Single-Input-Multiple-Output (SIMO) communications. In other examples, the FDD and TDD embodiments are performed in Multiple-Input-Multiple-Output (MIMO) and Multiple-Input-Single-Output (MISO) communications. JRNSO is determined by reducing MIMO and MISO communications to SISO or SIMO communications. JRNSO is also determined using determinants of MIMO channel products. Channel restrictions are removed by exploiting symmetric properties of matrix products. | 10-23-2008 |
20080279121 | Signal to interference ratio error as a load instability indicator for load control in cellular systems - An uplink signal-to-interference ratio for each of multiple mobile radio terminal connections supported in a cell in a cellular communications system is estimated. A signal-to-interference ratio error is determined for selected ones of the estimated uplink signal-to-interference ratios. One or more signal-to-interference ratio errors are identified that exceed a signal-to-interference ratio error threshold. An instability indicator associated with the cell is determined based on the one or more identified signal-to-interference ratio errors. A load control decision and/or a decision for scheduling one or more uplink mobile radio transmissions in the cell may then be made based on the instability indicator, e.g., to prevent a transmission power rush in the uplink in the cell and/or to efficiently use available resources for uplink transmissions. | 11-13-2008 |
20080279122 | LEAKAGE POWER REDUCTION APPARATUS - A circulator extracts a transmission signal sent from a transmitter to antenna via the circulator and a duplexer, reflected by an antenna, and returned via the duplexer to the transmitter side. The amplitude and phase of the extracted signal are adjusted by an amplitude-and-phase adjuster to generate an offset signal having the same amplitude and the opposite phase with respect to a leaking transmission signal included in a signal output from a third terminal of the duplexer when combined by a combiner. The offset signal is combined in the combiner with the leaking transmission signal included in the signal output from the third terminal of the duplexer to suppress the leaking transmission signal. | 11-13-2008 |
20080304430 | Method and Device For Decreasing a Transmission Delay in a Multi-Channel Data Transmission - The present invention relates to a method and a device to improve the transmission characteristics of physical layer (PHY) hybrid automated repeat request (HARD) in multi subchannel frequency division duplex (FDD) links. The present invention provides a method for decreasing a transmission delay in a multi-sub-channel data transmission of physical layer frames using hybrid automated repeat request with acknowledgement signaling, wherein said method comprises: determining, if no physical layer frame needs to be transmitted in a provided sub channel, determining, if there is a physical layer frame of another sub-channel with pending acknowledgement, selecting said physical layer frame with pending acknowledgement, if no physical layer frame needs to be transmitted in the provided sub-channel, and transmitting said selected frame in said provided sub-channel. The method can also or additionally comprise determining a threshold number, based on the number of sub-channels in said multi-sub-channel data transmission, determining the number of physical layer frames to be transmitted in all subchannels, and controlling the transmission power of the transmission of the physical layer frames, on the basis of the relationship between said threshold number and said determined number of physical layer frame. | 12-11-2008 |
20090028074 | Antenna feed network for full duplex communication - The present invention provides a wireless device for effecting two way wireless transmission, an antenna feed network ( | 01-29-2009 |
20090034437 | Apparatus and method for canceling interference in relay station in a communication system - A method and apparatus for canceling interference between a transmission signal and a received signal in a full-duplex RS in a communication system are provided, in which an RF/IF signal received from a first node through an antenna is converted to a baseband received signal, demodulated and decoded, a baseband transmission signal is generated by encoding and decoding the decoded data, a baseband interference estimate is calculated using the baseband received signal and the baseband transmission signal, a baseband interference is eliminated from the baseband received signal according to the baseband interference estimate, the baseband transmission signal is converted to an RF/IF transmission signal for a second node, an RF/IF interference estimate is calculated by converting amplitude of the RF/IF transmission signal and delaying it, and an RF/IF interference is eliminated from the RF/IF received signal according to the RF/IF interference estimate. | 02-05-2009 |
20090109880 | Impedance control apparatus and method for portable mobile communication terminal - An impedance control apparatus and method for portable mobile communication terminal is disclosed capable of accurately adjusting impedances relative to environment when the portable mobile communication terminal is being used, wherein an impedance of a first variable impedance matching part is varied to receive a reception impedance correction signal transmitted by a base station and to detect a reception strength, an impedance of the first variable impedance matching part is set by a impedance value of the largest reception strength out of the reception strengths, the portable mobile communication terminal varies the impedance of a second variable impedance matching part to transmit a transmission impedance correction signal to a base station and to allow the base station to detect the reception strength, and the impedance setting of the second variable impedance matching part is performed using the reception strength detected by the base station. | 04-30-2009 |
20090135744 | OPPORTUNISTIC SPECTRUM SENSING OPTIMIZATION FOR A COMMUNICATION SYSTEM - A combination of subscriber clustering and link interleaving provides a cognitive radio system (CR) | 05-28-2009 |
20090213765 | Terminal having a variable duplex capability - A cellular telecommunications terminal having a full-duplex mode of operation and a half-duplex mode of operation, including a first cellular transmitter and a first cellular receiver operable, when the terminal is in the full-duplex mode, to transmit and receive at the same time and operable, when the terminal is in the half-duplex mode, to transmit and receive at different times and not at the same time; and a switching control for changing the mode of operation of the terminal while operating in the full-duplex mode from the full-duplex mode to the half-duplex mode. | 08-27-2009 |
20090213766 | FRAME STRUCTURES WITH FLEXIBLE PARTITION BOUNDARY FOR WIRELESS NETWORKS - Various example embodiments are disclosed herein. According to an example embodiment, an apparatus may include a wireless interface, and a controller, the apparatus being configured to: transmit a downlink subframe of a frequency division duplex (FDD) frame to one or more mobile stations in a wireless network, each wireless station being assigned to one of a plurality of groups, such as, for example, one of group | 08-27-2009 |
20090213767 | Apparatus and method of block acknowledgements with reduced recipient state information - An apparatus and method for block acknowledgements with reduced recipient state information are described. In one embodiment, the method comprises the storing of a receive state for a block of frames received during a transmission opportunity (TXOP) with an on-chip state memory. Once stored, an immediate block acknowledgement, including the receive state information, may be transmitted to an originator according to a block acknowledgement request (BAR) received during the TXOP. In the embodiments described, the BAR is received during the TXOP in which the block of data frames were transmitted to a recipient. In one embodiment, the recipient is free to discard the receive state information to free space within the on-chip system memory by requiring the originator to maintain the receive state information of blocks of data frames transmitted during TXOPs. Other embodiments are described and claimed. | 08-27-2009 |
20090219837 | SIGNAL TRANSCEIVE FOR WIRELESS COMMUNICATION DEVICE - A signal transceiver for saving the production cost of a wireless communication device includes an antenna, an antenna switch module, a radio frequency (RF) transceiver, an RF front-end circuit, a first selection unit and a second selection unit. The signal transceiver uses the RF front-end circuit unit to meet requirements of multi-band for the wireless communication device through the operation of the first selection unit and the second selection unit to greatly reduce the production cost of the wireless communication device. | 09-03-2009 |
20090219838 | CLOSED-LOOP MIMO SYSTEMS AND METHODS - Methods, devices and systems are provided for transmitting and receiving MIMO signals. Transmitting of the MIMO signals involves pre-coding each of at least two data symbols using a respective pre-coding codeword to preclude a corresponding plurality of pre-coded data symbols. A respective signal is transmitted from each of a plurality of antennas, the respective signal including one of the pre-coded signals and at least one pilot for use in channel estimation. The signals collectively further include at least one beacon pilot vector consisting of a respective beacon pilot per antenna, the beacon pilot vector containing contents known to a receiver for use by the receiver in determining the codeword used to pre-code the at least one data signal. Receiving of the MIMO signals involves receiving a MIMO signal containing data symbols pre-coded with a codeword. The MIMO signal includes pilots, and including at least one beacon pilot vector containing contents known to a receiver/each beacon pilot vector containing one symbol from each transmit antenna. Processing is performed on the at least one beacon pilot vector to determine which codeword was used to pre-code the data symbols. | 09-03-2009 |
20090262669 | NETWORK INTERFACE DEVICE WITH SHARED ANTENNA - An improved network interface device includes at least two wireless network transceivers where the transceivers share at least one antenna. In one embodiment, one of the transceivers is a 2×2 MIMO WiFi N transceiver and the other of the transceivers is a 2×1 MIMO WiMAX transceiver. A priority selector and lockout control circuit is used to control which transceiver has access to the shared antenna. The control circuit of one embodiment is arranged so the WiMAX transceiver is given priority access to the shared antenna. | 10-22-2009 |
20090268643 | RADIO TRANSCEIVER ON A CHIP - An entire radio transceiver can be completely integrated into one IC chip. In order to integrate the IF filters on the chip, a heterodyne architecture with a low IF is used. A single, directly modulated VCO is used for both up-conversion during transmission, and down-conversion during reception. Bond-wires are used as resonators in the oscillator tank for the VCO. A TDD scheme is used in the air interface to eliminate cross-talk or leakage. A Gaussian-shaped binary FSK modulation scheme is used to provide a number of other implementation advantages. | 10-29-2009 |
20090274072 | Antenna feed network for full duplex cummunication - The present invention provides a wireless device for effecting two way wireless transmission, an antenna feed network, and a patch antenna. The wireless device includes an antenna assembly having two inputs accepting two feed signals shifted a feed signal phase difference apart. The antenna assembly receives a radiated signal and produces first and second received signals. First and second reflected feed signals are also produced at the two antenna inputs. A transmitter produces a transmission signal and a receiver receives the radiated signal while the transmission signal is transmitted by the antenna assembly. The antenna feed network interconnects the transmitter port, the receiver port, and the antenna assembly and produces the received signal while effecting substantial cancellation of the first and second reflected feed signals. Additionally, or alternatively, first and second transmission leakage signals at the received signal output substantially cancel each other. | 11-05-2009 |
20100027445 | TRANSMISSION CIRCUIT, METHOD FOR DETERMINING DELAY TIME USED IN THE TRANSMISSION CIRCUIT, AND COMMUNICATION APPARATUS USING THE TRANSMISSION CIRCUIT - Provided are generating an amplitude signal and a frequency signal through signal processing of data, angle-modulating the frequency signal, adjusting a delay time of the amplitude signal, amplitude amplifying of outputting a signal based on a magnitude of the amplitude signal having the delay time adjusted, amplitude-modulating a signal outputted through the angle modulating, by the signal outputted through the amplitude amplifying, so as to output an obtained signal as a modulated signal, and delay processing of calculating a delay time difference between the amplitude signal and the frequency signal, based on the modulated signal, and performing feedback control for the delay time until the delay time difference is eliminated, only in a test period. Through the signal generating, a sinusoidal signal is outputted as each of the amplitude signal and the frequency signal during the test period. | 02-04-2010 |
20100061279 | Transmitting and Receiving Wireless Signals Via Dual Antennas - Systems, methods, and devices to transmit and receive wireless signals are described. | 03-11-2010 |
20100085901 | SYSTEM AND METHOD FOR COORDINATING HALF-DUPLEX COMMUNICATIONS PROTOCOLS - The present disclosure is directed to a system and method for operating a user agent (UA) and access device located within a communications cell according to a half-duplex (HD), frequency-division duplexing (FDD) protocol. The system and method are designed to accommodate a guard period (GP) between downlink (DL) and uplink (UL) communications from the UA, while addressing the loss of at least part of the DL communication before a subsequent UL subframe to accommodate the GP. | 04-08-2010 |
20100110941 | MANAGEMENT UNIT NETWORK FOR COLLABORATIVELY MANAGING A PLURALITY OF MULTISERVICE COMMUNICATION DEVICES - A management unit includes a communication device interface for facilitating a bidirectional data communication with multiservice communication devices via a wireless control channel, the bidirectional data communication including outbound control data sent to at least one of the multiservice communication devices and inbound control data received from at least one of the multiservice communication devices. At least one of the multiservice communication devices includes a collaboration module. A network interface receives network resource data from a plurality of networks. A management processing unit processes the inbound control data and the network resource data and that generates the outbound control data in response thereto to collaboratively establish at least one device setting of at least one of the multiservice communication devices via the collaboration module. The wireless control channel may be separate from the communication between the multiservice communication devices and the networks or embedded in network communications. | 05-06-2010 |
20100118744 | WIRELESS TRANSCEIVER SYSTEM FOR SUPPORTING DUAL MODE - The present invention relates to a wireless transceiver system for supporting a dual mode, and more particularly to a wireless transceiver system for supporting a dual mode that simultaneously supports the Frequency Division Duplex (FDD) method and the Time Division Duplex (TDD) method in a certain frequency band. The present system supports the FDD system conducting transmission and reception simultaneously by using different frequency bands for transmission and reception as well as the TDD system temporally alternating transmission and reception by using the common frequency band among an upper frequency band and a lower frequency band used in the FDD system as well as another frequency band adjacent thereto, thereby selectively supporting both of the two communication systems in a wireless transceiver system. Therefore, efficient use of various wireless communication standards and the limited frequency resource is provided, and on this basis, an efficient application of all wireless transceiver systems adopting the TDD system and the FDD system as well as the mobile communication base station and the terminal is provided. | 05-13-2010 |
20100150033 | SOFTWARE RADIO FREQUENCY CANCELLER - A full-duplex RF communication system and corresponding methods use digital adaptive filters for interference cancellation. As provided, the techniques allow full-duplex radio frequency communication without frequency-, time-, or code-division multiplexing and without the use of hardware RF cancellers. Such techniques may be useful for wireless communication, such as cellular communication, radio communication, broadcasting, short-range point-to-point communication, wireless sensor networks, and wireless computer networks. | 06-17-2010 |
20100165891 | LOCAL SIGNAL GENERATOR FOR WIRELESS TELECOMMUNICATION AND LOCAL SIGNAL GENERATION METHOD AND RADIO ACCESS SYSTEM OF WIRELESS TELECOMMUNICATION SYSTEM USING THE SAME - Disclosed is an apparatus and a method for generating a local signal and a Radio Access Station (RAS) using the same in a wireless telecommunication system. The apparatus includes: an Intermediate Frequency (IF) local unit for generating an IF local signal; and a Radio Frequency (RF) local unit for generating an RF local signal, wherein the IF local unit comprises: a first frequency synthesizer for generating the IF local signal; and a first distributor for distributing the IF local signal into an IF local signal for transmission and an IF local signal for reception, and wherein the RF local unit comprises: a second frequency synthesizer for generating the RF local signal; and a switch for distinguishing the RF signal into an RF local signal for transmission and an RF local signal for reception, and switching the RF local signal for transmission to a transmission path and the RF local signal for reception to a receive path. An optimized circuit configuration is provided so that the local signals for transmission/reception can be generated by a single frequency synthesizer, and the distributor is used instead of the switch in generating the IF local signals for transmission/reception, so that spurious emissions due to the operation of the switch are prevented from occurring, and the characteristic of phase noise can be improved. | 07-01-2010 |
20100226290 | METHOD FOR COMMUNICATING DATA BETWEEN MOBILE STATION AND BASE STATION, AND MOBILE COMMUNICATION TERMINAL THEREOF - A method for transmitting and receiving data by a mobile station (MS), a method for transmitting and receiving data by a base station (BS), and a mobile communication terminal are provided. The method for transmitting and receiving data by an MS includes generating an uplink subframe by placing an uplink control channel so as to have a margin with a time allocated to a MAP of a downlink subframe and transmitting the uplink subframe to a BS. A new frame structure compatible with a full duplex FDD MS is applied in a mobile communication system. | 09-09-2010 |
20100238844 | MULTIBAND WIRELESS COMMUNICATION METHOD AND MULTIBAND WIRELESS COMMUNICATION APPARATUS - A multiband wireless communication method for performing a reception operation in a second frequency band while performing a transmission operation in a first frequency band selectively changes a gain characteristic of a power amplifier ( | 09-23-2010 |
20100246454 | NOVEL TRANSMIT/RECEIVE BALUN STRUCTURE - A technique for efficient balun duplexing includes providing a switchless path through a balun. In a receive mode, a transmit path is blocked and signal is directed along a switchless receive path. In a transmit mode, a receive path is blocked and signal is directed along a switchless transmit path. | 09-30-2010 |
20100260077 | RADIO CIRCUIT DEVICE - A radio circuit device capable of reducing a cross-modulation interference which occurs at a reception circuit due to a transmission signal leakage is provided. | 10-14-2010 |
20100265851 | WIMAX BASED POINT TO MULTIPOINT SYSTEM OPERATING IN FREQUENCIES BELOW 1 GHZ - A system for the delivery of high speed data mission critical, private broadband wireless networks based on a modified version of the ieee802.16e-2005 standard and subsequent versions of this standard referred to, known as “mobile WiMAX”. The system comprises a plurality of base stations, each of said base stations covering at least one sector, which maintain two-way data communication, with a plurality of mobile stations and fixed subscriber stations in its serving area, over licensed frequency bands below 1 GHz in accordance with the mobile WiMAX standard. The mobile WiMAX air interface standard (ieee802.16e) is modified for channel sizes below 1.25 MHz. | 10-21-2010 |
20100265852 | Circuit Configuration for a Mobile Radio Device and Method for Operating the Same - A circuit arrangement for a mobile radio device includes a first transmission path for a first communication system with TDD duplex operation and a second transmission path for a second communication system with FDD duplex operation. The first transmission path contains a first transmission filter and the second transmission path contains a first duplexer. The first and second communication systems use transmission frequency bands that are arranged within the same octave. A transmitted signal from the first communication system can be routed switchably and thus either via the first or the second transmission path. | 10-21-2010 |
20100271985 | Device for receiving and transmitting mobile telephony signals with multiple transmit-receive branches - An improved device for receiving and transmitting mobile telephony signals comprises at least 4 channels. Each of the at least 4 channels (K | 10-28-2010 |
20100271986 | RADIO FREQUENCY MODULE AND WIRELESS COMMUNICATION DEVICE USING THE SAME - An RF module for multimode-multiband communication includes an RF switch, a GPS communication module, a CDMA communication module, a GSM communication module, a WLAN communication module. The GPS communication module, the CDMA communication module, the GSM communication module and the WLAN communication module are connected the RF switch. The RF switch can switch among the GPS communication module, the CDMA communication module, the GSM communication module and the WLAN communication module to transmit/receive signals correspondingly. | 10-28-2010 |
20100271987 | Full Division Duplex System and a Leakage Cancellation Method - An exemplary embodiment of a full division duplex system comprises a receiver, a transmitter and an auxiliary circuit. The receiver receives an inbound RF signal of a first band to generate an inbound baseband signal, and the transmitter up converts an outbound baseband signal by an oscillation signal to generate an outbound RF signal of a second band for transmission. The auxiliary circuit calculates leakages from the outbound RF signal to generate a blocker replica, in which a LNA is coupled to a non-conductive coupling path extended from the input of receiver to collect leakages from the outbound RF signal to produce an induction signal. The induction signal is down converted to perform an adjustment, and thereafter up converted again to generate the blocker replica. In this way, the inbound baseband signal is generated from a subtraction of the inbound RF signal and the blocker replica. | 10-28-2010 |
20100290368 | HALF-DUPLEX RFID TRANSPONDER AND A METHOD OF OPERATING A HALF-DUPLEX RFID TRANSPONDER - A half-duplex RFID transponder with an integrated three-dimensional front-end circuit which includes three LC resonant circuits arranged in a three-dimensional configuration. Each LC resonant circuit is coupled to a different one of three storage capacitors which are charged during a capacitor charging phase by energy in an RF signal received by the associated LC resonant circuit. The front-end circuit includes three receiver channels and each receiver channel is associated to a different one of the three LC resonant circuits. A channel selector is adapted to detect, which one of the three storage capacitors is first charged to a threshold voltage, to select the receiver channel associated to the LC resonant circuit which is coupled to the storage capacitor which is first charged and to deactivate the two other receiver channels. A method of operating a half-duplex RFID transponder with three LC resonant circuits arranged in a three-dimensional configuration with each LC resonant circuit coupled to a different storage capacitor which is charged during a capacitor charging phase by energy in an RF signal received by the associated LC resonant circuit. Three receiver channels are associated to the three LC resonant circuits. The method includes monitoring the charge level of each of the three storage capacitors, detecting which storage capacitor is first charged to a threshold voltage, selecting the receiver channel associated to the first charged storage capacitor and deactivating the two other receiver channels. | 11-18-2010 |
20100302976 | Front-End Circuit - A front-end circuit for a mobile radio includes a first Frequency Division Duplexing (FDD) transmission path for a first FDD mobile radio system, where the first FDD transmission path includes a transmission amplifier and a duplexer that includes a transmission filter element; a first Time Division Duplexing (TDD) transmission path for a first TDD mobile radio system, where the first TDD transmission path includes a transmission amplifier; an antenna connection configured for connecting to the duplexer or to the first TDD transmission path; at least one transmission filter; and a switch configuration to connect the at least one transmission filter to the first FDD transmission path or to the first TDD transmission path. The first TDD mobile radio system and the first FDD mobile radio system use a same first frequency band. | 12-02-2010 |
20100309825 | METHODS, SYSTEMS AND DEVICES FOR WIRELESS DEVICES HAVING MULTIPLE WIRELESS MODULES - Wireless communications devices, methods and systems are implemented in various fashions. According to one such implementation, a method is used in a device using time-division-multiple access and multiple-mode wireless modules. Logic generates a signal indicative ( | 12-09-2010 |
20100322114 | METHOD FOR ALLOCATING UPLINK ACK/NACK CHANNELS - Present invention provides a method for impliedly binding CCE indexes in one sub-frame to ACK/NACK channel indexes in one uplink sub-frame, and a method for impliedly binding CCE indexes in a plurality sub-frames to ACK/NACK channel indexes in one uplink sub-frame. | 12-23-2010 |
20100329157 | Even-Order Harmonics Calibration - Circuits and methods for a differential circuit involve having one of more pairs of differential transistors with back-gate terminals, where each of the back-gate terminals is biased by a tunable back-gate voltage to compensate for circuit mismatches in the differential circuit and reduce or eliminate even-order harmonics in the output signal. A compensation circuit can be configured to receive data relating to the differential output signal of the differential circuit, and to supply one or more back-gate voltages to the back-gate terminals of the differential transistors to adjust threshold voltages of the differential transistors and suppress even-order harmonics in the differential output signal of the differential circuit. | 12-30-2010 |
20100329158 | RF SINGLE-ENDED TO DIFFERENTIAL CONVERTER - Techniques for designing a highly differential single-ended-to-differential converter for use in, e.g., communications receivers. In an exemplary embodiment, an auxiliary current path including cascomp transistors is coupled to a main current path including input transistors and cascode transistors. The transistors are biased such that inter-modulation products generated by the auxiliary current path cancel out inter-modulation products generated by the main current path. In another exemplary embodiment, current source transistors for the main current path are adaptively biased depending on the level of the input signal received. In an exemplary embodiment, the techniques may be applied to designing a converter for interfacing a single-ended low-noise amplifier (LNA) output voltage with a differential mixer input in a communications receiver. | 12-30-2010 |
20110026442 | APPARATUS AND METHOD FOR PROTECTING RECEIVE CIRCUITS IN TDD WIRELESS COMMUNICATION SYSTEM - An apparatus and a method for protecting receive circuits in a Time Division Duplexing (TDD) wireless communication system are provided. The receive circuit protecting apparatus includes a TDD controller for controlling transmission and reception modes according to transmission and reception intervals, a transmitter for power-amplifying and outputting a Radio Frequency (RF) signal in the transmission mode under control of the TDD controller, and a Transmit/Receive Antenna Switch (TRAS) for, in the transmission mode, forwarding a signal of the transmitter to an antenna feed line under the control of the TDD controller and for absorbing an output signal of the transmitter flowing to the receive circuits using a reflection structure positioned in a reception path, and, in the reception mode, for forwarding a signal fed from the antenna feed line to the receive circuits under the control of the TDD controller. | 02-03-2011 |
20110032848 | MOBILE COMMUNICATIONS SYSTEM, BASE STATION APPARATUS, USER APPARATUS AND METHOD - A base station apparatus used for a FDD mobile communications system which uses at least a predetermined frequency bandwidth is disclosed. The base station apparatus includes a control unit which provides an instruction signal which at least indicates a frequency band used in wireless communications; and a unit which wirelessly communicates with a user apparatus according to the instruction signal, wherein, if the base station apparatus belongs to a predetermined border area between mobile communications systems, an instruction signal which indicates that use of one part of the predetermined frequency band is permitted, but use of another part is prohibited is provided by the control unit, and, if the base station apparatus belongs to a predetermined non-border area, an instruction signal which indicates that use of one part and use of the other part are permitted. | 02-10-2011 |
20110044214 | MOBILE COMMUNICATION SYSTEM - In a mobile communication system including a base station and a user terminal which communicate with each other according to FDD (frequency division duplex), an uplink frequency band and a downlink frequency band which are adjacent to each other are divided into plural time slots. The user terminal includes an interference detecting unit configured to detect interference in the downlink frequency band; and a time slot information generating unit configured to generate information about an available time slot in the downlink frequency band based on the detected interference. The base station includes a time slot allocating unit configured to allocate a time slot to be used in the downlink frequency band based on the information about the time slot received from the user terminal. | 02-24-2011 |
20110051628 | BROADBAND COMBINING SYSTEM WITH HIGH SPECTRUM EFFICIENCY FOR USE IN WIRELESS COMMUNICATIONS - A system for combining a plurality of signals in a wireless communication device employs a plurality of base station duplexers each coupled to a corresponding base station from a plurality of collocated base stations, each base station capable of receiving and transmitting signals in accordance with a corresponding transmission protocol. Each duplexer includes a transmit and receive paths for allowing signals to be transmitted from the base station and further allowing signals to be received by the base station. Isolators are each coupled to a corresponding one of the transmit path of each of the duplexers. Bandpass filters are each coupled to an output port of a corresponding one of the isolator and a combiner receives signals provided by each one of the band pass filters. An antenna duplexer is coupled to an output port of the combiner via a transmit path, where the duplexer provides a combined signal of the collocated base stations to an antenna. The duplexer further includes a receive path for providing signals received by the antenna to a corresponding receive path of each of the base station duplexers. | 03-03-2011 |
20110058503 | RADIO COMMUNICATION SYSTEM, BASE STATION, INTER-BASE STATION SYNCHRONIZATION METHOD, AND PROGRAM - A radio communication system includes a terminal and base stations that transmit subframes to and receive subframes from said terminal by means of OFDMA/TDD. The base stations include a first base station and a second base station that is adjacent to the first base station and that establishes frame synchronization with the first base station. The second base station: receives a specific uplink signal contained in an uplink subframe that is transmitted to the first base station from the terminal that is located at the cell boundary of the first base station and the second base station; based on the timing of the reception of the specific uplink signal, estimates the timing of the transmission of the header of uplink subframes transmitted from the terminal; and based on the timing of the transmission of the header of the uplink subframes that was estimated, controls the timing of the transmission of downlink subframes that are transmitted to the terminal. | 03-10-2011 |
20110064005 | RF Front-End with Wideband Transmitter/Receiver Isolation - Embodiments of a four-port isolation module are presented herein. In an embodiment, the isolation module includes a step-up autotransformer comprising a first and second winding that are electrically coupled in series at a center node. The first port of the isolation module is configured to couple an antenna to a first end node of the series coupled windings. The second port of the isolation module is configured to couple a balancing network to a second end node of the series coupled windings. The third port is configured to couple a transmit path to the center node. The fourth port is configured to couple a differential receive path across the first end node and the second end node. The isolation module effectively isolates the third port from the fourth port to prevent strong outbound signals received at the third port from saturating an LNA coupled to the fourth port. | 03-17-2011 |
20110069644 | Apparatus for Sharing a Wireless Communication Base Station - A wireless communication base station shares one antenna between a main system and a subsystem. A signal combiner/divider is connected to each of the transmission/reception signal lines of a main and a subsystem duplexer and combines signals according to their phases and divides other signals. A filter is provided in the signal paths between the combiners/dividers. | 03-24-2011 |
20110080856 | DUPLEXER AND METHOD FOR SEPARATING A TRANSMIT SIGNAL AND A RECEIVE SIGNAL - The present disclosure provides a duplexer for separating a transmit signal and a receive signal. The duplexer comprises a transmit filter, a receive filter and an analogue quadrature splitter, a first filtering element and a second filtering element. By choosing the first filtering element and the second filtering element substantially identical, it is possible to transform filtering characteristics of the first and second filtering element such that stop bands are substantially transformed into an effective pass band, and vice versa. The analogue quadrature splitter is adapted to increase an attenuation of the transmit signals outside the transmit band, such as in the receive band. Therefore out-of-band emissions by the transmitter will be substantially reduced. The present disclosure further provides a method for separating a transmit signal and a receive signal, and computer program products for the manufacture for carrying out the method of separating transmit signals and receive signals. | 04-07-2011 |
20110090824 | LOW-PASS FILTER DESIGN - Techniques for low-pass filtering with high quality factor (Q). In an exemplary embodiment, an input current is coupled to the drain of a first transistor. The drain and the gate of the first transistor are coupled together by a resistor R | 04-21-2011 |
20110134810 | MODULE FOR USE IN MOBILE COMMUNICATION TERMINAL AND MOBILE COMMUNICATION TERMINAL APPLYING THE SAME THEREIN - For providing a module for use of a mobile communication terminal, being small in sizes and high in reliability, and enabling with plural numbers of bands, and also a mobile communication terminal with using the same therein, canceling is conducted on transmission signal and/or noises of reception band on reception side with using a feed forward technology, for maintaining a degree of suppression of the transmission signal and/or the noises of reception band on the reception side. In this case, for achieving the cancellation of wide band signals from the transmission signal to the reception band, a delay adjusting function is used, in addition to gain and phase adjusting functions. Also, for conducting stable canceling of jamming signals, controls are conducted on the gain, the phase and the delay of a loop with using a reception SN and/or a CQI signal, etc. | 06-09-2011 |
20110205940 | WIRELESS COMMUNICATION DEVICE, WIRELESS COMMUNICATION SYSTEM, AND WIRELESS COMMUNICATION METHOD - A second wireless communication device transmits a data using a plurality of carrier frequencies to a first wireless communication device which transmits by a beam with directivity. The first wireless communication device forms the beam with directivity in accordance with a wireless propagation path when receiving the data from the second wireless communication device. The second wireless communication device comprises a control unit for controlling the transmission of the data. The control unit selects at least one carrier frequency, controls the transmission of the data so as to transmit the data using the carrier frequency selected, and controls the transmission of the data so as to transmit the data using carrier frequency not selected in an immediately preceding frame when transmitting the data in a next frame. | 08-25-2011 |
20110274014 | DUAL MODE BASE STATION - The present application pertains to a dual mode radio base station that is operable to operate in either a TDD mode of operation or an FDD mode of operation. The dual mode base station may include a base-band unit (BU) and a radio unit (RU). The base-band unit may include (1) a first set of components each of which is configured to provide functionally while (a) the dual mode base station is operating in the FDD mode of operation and (b) the dual mode base station is operating in the TDD mode of operation; and (2) a second set of components each of which is configured to provide functionally (a) only while the dual mode base station is operating in the FDD mode of operation or (b) only while the dual mode base station is operating in the TDD mode of operation. | 11-10-2011 |
20110292844 | USER EQUIPMENT FOR SIMULTANEOUSLY TRANSMITTING SIGNALS TO WHICH DIFFERENT WIRELESS COMMUNICATION SYSTEMS ARE APPLIED THROUGH A PLURALITY OF FREQUENCY BANDS - A user equipment (UE) including first and second antennas; a first wireless communication chip configured to output first and second signals corresponding to first and second frequency bands, respectively; a second wireless communication chip configured to output thirds signals corresponding to a third frequency band; and a radio frequency (RF) front-end module configured to transmit the first and second signals corresponding to the first and second frequency bands output from the first wireless communication chip to the first antenna, transmit the third signal corresponding to the third frequency band output from the second wireless communication chip to the first antenna, transmit the second signal corresponding to the second frequency band externally received in the first antenna to the first wireless communication chip through a secondary Rx path, transmit the second signal corresponding to the second frequency band externally received in the second antenna to the first wireless communication chip through a primary Rx path, and transmit the third signal corresponding to the third frequency band received in the first and second antennas to the second wireless communication chip. | 12-01-2011 |
20110299434 | REDUCING POWER CONSUMPTION BY TAKING ADVANTAGE OF SUPERIOR IN-CIRCUIT DUPLEXER PERFORMANCE - Although the duplexer in a full-duplex transceiver circuit may only be guaranteed by the duplexer manufacturer to have a transmit band rejection from its TX port to its RX port of a certain amount, and may only be guaranteed to have a receive band rejection of another amount, the actual transmit band rejection and the actual receive band rejection of a particular instance of the duplexer may be better than specified. Rather than consuming excess power in the receiver and/or transmitter in order to meet performance requirements assuming the duplexer only performs as well as specified, the duplexer's in-circuit performance is measured as part of a transmitter-to-receiver isolation determination. Transmitter and/or receiver power settings are reduced where possible to take advantage of the measured better-than-specified in-circuit duplexer performance, while still meeting transceiver performance requirements. Power settings are not changed during normal transmit and receive mode operation. | 12-08-2011 |
20110299435 | FRONT END MODULE WITH ACTIVE TUNING OF A BALANCING NETWORK - A radio front end includes a duplexer, a tunable balancing network, a detector module, and a processing module. The duplexer is operably coupled to an antenna and is operable to provide electrical isolation between an outbound wireless signal and an inbound wireless signal. The tunable balancing network is operably coupled to the duplexer and operable to establish an impedance that substantially matches an impedance of the antenna based on a tuning signal. The detector module is operable to generate an error signal based on an electrical performance characteristic of the duplexer. The processing module is operable to generate the tuning signal based on the error signal. | 12-08-2011 |
20110299436 | FRONT END MODULE WITH SCALABLE IMPEDANCE BALANCING - A radio front end includes a power amplifier, a duplexer, a detection module, a processing module, and a tunable balancing network. The duplexer is operable to provide electrical isolation between the outbound wireless signal and an inbound wireless signal. The detection module is operable to detect non-linear function of the power amplifier to produce a detected non-linearity and to detect transmit leakage of the duplexer to produce detected transmit leakage. The processing module is operable to generate a coarse tuning signal based on the detected non-linearity and to generate a fine tuning signal based on the detected transmit leakage. The tunable balancing network is operably coupled to the duplexer and operable to establish an impedance based on the coarse and fine tuning signals. | 12-08-2011 |
20110299437 | FRONT END MODULE WITH COMPENSATING DUPLEXER - A front end module includes a duplexer and a balancing network. The duplexer includes a compensation circuit and a transformer three windings having five nodes. The first node for operably coupling an antenna to the first winding; the second node operable to receive an outbound wireless signal and operably couples the first winding to the second winding; the third node operably couples the second winding to a balancing network; the fourth node operably coupled to output a first signal component corresponding to an inbound wireless signal from the third winding; and the fifth node operably coupled to output a second signal component corresponding to an inbound wireless signal from the third winding. The duplexer provides electrical isolation between the first and second signal components and the outbound wireless signal. The compensation module is operable to compensate the electrical isolation between the first and second signals and the outbound wireless signal. | 12-08-2011 |
20110305171 | TRANSMISSION CIRCUIT AND TRANSMISSION METHOD - A transmission circuit that performs modulation based on a phase difference signal and an amplitude signal includes an asymmetrical phase rotation device. The asymmetrical phase rotation device performs an operation of subtracting 2π from a value of the phase difference signal when the value of the phase difference signal is greater than a predetermined positive threshold value, or an operation of adding 2π to the value of the phase difference signal when the value of the phase difference signal is less than a predetermined negative threshold value. Accordingly, the transmission circuit has distortion reduction characteristics improved uniformly over a range of frequencies higher or lower than a carrier wave band. | 12-15-2011 |
20110310775 | DE-MULTIPLEXING A RADIO FREQUENCY INPUT SIGNAL USING OUTPUT TRANSFORMER CIRCUITRY - The present disclosure relates to de-multiplexing at least one RF input signal feeding RF power amplifier circuitry to create multiple de-multiplexed RF output signals, which may be used to provide RF transmit signals in an RF communications system. Output transformer circuitry is coupled to outputs from the RF power amplifier circuitry to provide the de-multiplexed RF output signals, which may support multiple modes, multiple frequency bands, or both. The de-multiplexed RF output signals may be used in place of RF switching elements in certain embodiments. As a result, RF front-end switching circuitry in the RF communications system may be simplified, thereby reducing insertion losses, reducing costs, reducing size, or any combination thereof. Additionally, the output transformer circuitry may provide load line transformation, output transistor biasing, or both to the RF power amplifier circuitry. | 12-22-2011 |
20120020256 | Method and System for Time Synchronization of WiMAX and LTE-TDD Networks - Embodiments of a method and system for supporting co-existence of first and second cellular networks in adjacent channels in the same geographical area are provided. The method and system synchronize the two cellular networks such that their respective uplink transmissions are aligned in time and their respective downlink transmissions are aligned in time. Such synchronization prevents (or substantially prevents) the uplink transmissions from one of the two cellular networks from overlapping with the downlink transmissions of the other cellular network, and vice versa, thereby mitigating interference between the two networks. | 01-26-2012 |
20120020257 | WIRELESS COMMUNICATION APPARATUS AND WIRELESS COMMUNICATION METHOD - When communicating with a second wireless station, a first wireless station judges, based on link-related information received from the second wireless station and link-related information extracted from a signal transmitted by a fourth wireless station, whether a transmission link from the third wireless station to the fourth wireless station and a transmission link from the first wireless station to the second wireless station can be concurrently established without interference with each other. If judging affirmatively, the first wireless station transmits a signal to the second wireless station in synchronization with a signal transmitted by the third wireless station to the fourth wireless station. | 01-26-2012 |
20120076055 | A METHOD AND A DEVICE FOR CALIBRATION - An eNodeB in a TDD system ( | 03-29-2012 |
20120093039 | PORTABLE COMPUTING DEVICE HAVING AN RF BASED ARCHITECTURE - A portable computing device includes a radio frequency (RF) wired link, a data wired link, a core module, a plurality of multi-mode RF units, and a plurality of data modules. The core module is operable to communicate control information with one or more of the plurality of multi-mode RF units in a first frequency band via the RF wired link. The core module is further operable to communicate data of a wireless communication with one or more of the plurality of multi-mode RF units in a second frequency band via the RF wired link. The core module is further operable to communicate clock information to the plurality of multi-mode RF units in a third frequency band via the RF wired link. | 04-19-2012 |
20120106402 | POLAR MODULATOR - A polar modulator of the present invention includes: a first function block which generates an amplitude signal and a phase signal; a second function block which adjusts the signal delay between the amplitude signal and the phase signal; a third function block which allows the low frequency component of the amplitude signal to pass therethrough; a fourth function block which modulates the phase of the phase signal; a fifth function block which outputs a modulation voltage, based on the amplitude signal; a sixth function block which modulates the amplitude of the phase signal, based on the modulation voltage; a seventh function block which measures the temperature of at least one function block; and an eighth function block which calculates a compensation amount for the signal delay, based on the measured temperature. The second function block adjusts the signal delay, based on the compensation amount. | 05-03-2012 |
20120106403 | TRANSMISSION CIRCUIT - A transmission circuit according to the present invention includes: an amplitude signal driving section ( | 05-03-2012 |
20120134304 | ACOUSTIC PORTING FOR A PORTABLE COMMUNICATION DEVICE - A portable full duplex communication device ( | 05-31-2012 |
20120147791 | PRESELECTOR INTERFERENCE REJECTION AND DYNAMIC RANGE EXTENSION - A wireless telemetry module and associated method reject interference in a received signal. The wireless telemetry module includes an antenna receives a communication signal transmitted at a desired channel frequency and having a channel bandwidth. A transceiver is controlled to operate in receiving and transmitting modes by a processor. An interference rejection module receives control signals from the processor corresponding to the desired channel frequency and is coupled between the antenna and the transceiver when the transceiver is operating in the receiving mode. | 06-14-2012 |
20120155335 | Method for a Canceling Self Interference Signal Using Active Noise Cancellation in the Air for Full Duplex Simultaneous (In Time) and Overlapping (In Space) Wireless Transmission & Reception on the Same Frequency band - A method for full duplex communication includes creating a canceling self interference signal using active noise cancelation in the air by using a plurality of transmit antennas and feeding the plurality of antennas with an RF signal in so that part of said RF signal is destructively combined at a receive antenna, and attaining full-duplex simultaneous in time and overlapping in space wireless transmission and reception on same frequency band responsive to the step of creating a canceling self interference signal. | 06-21-2012 |
20120155336 | Method For A canceling Self Interference Signal Using Passive Noise Cancellation For Full-Duplex Simultaneous (in Time) and Overlapping (In Space) Wireless transmission and Reception On The Same Frequency Band - A method for full duplex communication that includes creating a canceling self interference signal using a passive noise cancellation, and attaining full-duplex simultaneous in time and overlapping in space wireless transmission and reception on same frequency band responsive to the step of creating a canceling self interference signal. | 06-21-2012 |
20120163247 | RADIO-FREQUENCY MODULE AND RADIO COMMUNICATION SYSTEM - There is provided a radio-frequency module and a radio communication system capable of supporting multiple bands at low cost or small size. A high-frequency power amplifier device includes a power amplifier circuit unit for GSM and a control circuit outputting antenna switch control signals with a VSW | 06-28-2012 |
20120182906 | High isolation signal routing assembly for full duplex communication - A signal routing assembly accepts a first transmission signal at an input and outputs a substantial portion of the signal at a common port of the signal routing assembly. A second transmission signal is received at the common port and is routed through the signal routing assembly delivered to output of the signal routing assembly. Leakage signals from routing devices leaking the first transmission signal are terminated inside the signal routing assembly. Leakage signal from a divider/combiner are cancelled by reflect signal from at least one reflector device. A transmitter produces the first transmission signal and the signal routing assembly delivers this signal to the common port of the signal routing assembly. In full duplex operation, second transmission signals received at the common port are routed to the output to be applied to a receiver. | 07-19-2012 |
20120188918 | ELECTROMAGNETIC WAVE CIRCUIT DISRUPTOR AND METHOD - Disclosed herein is an electromagnetic wave circuit disruptor apparatus suitable for disrupting the action of electromagnetic signals, the apparatus including: a biasable non-reciprocal device having terminals for receiving and transmitting the electromagnetic signals wherein the electromagnetic signals propagate around the non-reciprocal device terminals in a first direction when the non-reciprocal device is biased to operate in a first mode and the electromagnetic signals propagate around the non-reciprocal device terminals in a second direction when the non-reciprocal device is biased in a second mode; a controllable biaser coupled to the non-reciprocal device so as to bias the non-reciprocal device to operate in one of the first mode and second mode; a signal detector connected to at least one terminal of the non-reciprocal device to detect the electromagnetic signals at the at least one terminal; and a controller connected to the signal detector and the controllable biaser to selectively reverse the bias of the controllable biaser upon the detection of a condition in the electromagnetic signals at the at least one terminal, thereby causing the electromagnetic signals to propagate in a reverse direction so as to disrupt the action of the electromagnetic signals. The energy level at the receiver terminal of the non-reciprocal device is monitored to detect a condition such as an inappropriate amount of power at a circuit, such as receiver circuitry. When a failure mode is detected the bias of the controllable biaser is reversed, thus reversing the direction of the non-reciprocal device. Instead of flowing into the circuit, energy flows into a properly matched load on a provided terminal of the non-reciprocal device and is dissipated. | 07-26-2012 |
20120195237 | DUPLEXER BYPASS - Disclosed are circuits, techniques and methods for implementing a process of selectively bypassing a duplexer in a transmission path. In a particular embodiment, a receiver and a transmitter are coupled to a shared antenna through a duplexer. The duplexer may be selectively bypassed under certain conditions while the receiver is disabled and/or powered off. | 08-02-2012 |
20120201174 | Duplexer/Multiplexer Having Filters that Include at Least One Band Reject Filter - A wireless communications device includes an antenna, a multi-port path selection structure having an antenna port connected to the antenna, and plural ports connected to respective one or more receive and transmit paths of the wireless communications device. The multi-port path selection structure has a transmit band reject filter connected to the transmit path and a second filter connected to the receive path. | 08-09-2012 |
20120201175 | FILTERING USING IMPEDANCE TRANSLATOR - This disclosure relates to low noise amplifiers (LNAs) and more particularly to LNAs integrated on integrated circuit (IC) chips along with radio frequency (RF) amplifiers. In one implementation, an impedance translator is coupled to an amplifier, the impedance translator to cause the amplifier to selectively amplify the one or more components of a received signal. | 08-09-2012 |
20120207064 | Receiver for Receiving RF-Signals in a Plurality of Different Communication Bands and Transceiver - A receiver for receiving RF-signals in a plurality of different communication bands, each communication band including a receive frequency range and a transmit frequency range includes a plurality of receiving ports, a plurality of input circuits, a first inductor and a second inductor. Each receiving port is configured to receive RF-signals in a receive frequency range of a communication band. Each input circuit is connected to an associated receiving port for processing RF-signals applied to the receiving port. The first inductor is connected to a first group of input circuits and the second inductor is connected to a second group of input circuits, wherein the first group of input circuits and the second group of input circuits are disjunct. The receiving ports associated with the first group of input circuits are configured to receive RF-signals in a first group of communication bands, wherein in the first group of communication bands, none of the transmit frequency ranges overlap with one of the receive frequency ranges. The receiving ports associated with the second group of input circuits are configured to receive RF-signals in a second group of communication bands, wherein in the second group of communication bands, none of the transmit frequency ranges overlaps with one of the receive frequency ranges. | 08-16-2012 |
20120230230 | RESOURCE ALLOCATION FOR OFDMA SYSTEMS WITH HALF-DUPLEX RELAY(S) AND CORRESPONDING TRANSMISSION PROTOCOL - A transmission protocol is provided for wireless communications in an OFDMA system that uses a rateless code and techniques are provided for dynamically adjusting the subcarrier resources allocated to an OFDMA relay node so that the relay is used at the right time according to the instantaneous channel state information (CSI). As a result, a higher throughput is achieved between source and destination nodes based on a low complexity algorithm for determining when relay assistance is helpful for completing a transmission between the source and destination nodes. | 09-13-2012 |
20120269102 | FREQUENCY AGILE DUPLEX FILTER - Systems and methods are disclosed for an electronically adjustable signal filter system, which comprises, in some embodiments, a first filter coupled to an antenna coupling network and a second filter, a power amplifier coupled to the first filter, an antenna connected to an antenna coupling network, a pilot tone generator coupled to the first filter, and a first signal source connected to the power amplifier and first filter. In some embodiments, the power amplifier amplifies the first signal, the first filter places a notch into the first signal transmitted to the antenna coupling network, the antenna coupling network combines the first signal and a second signal received from the antenna and transmits a third signal to the second filter. | 10-25-2012 |
20120300679 | COMMUNICATION MODULE - A communication module includes: a plurality of receiving filters that are connected between an antenna terminal and a receiving terminal and have a receive band different from each other; and a passive circuit that is commonly connected to at least two of the plurality of receiving filters and makes a receive band of one of said at least two of the plurality of receiving filters suppressed when making another receive band of said at least two of the plurality of receiving filters transitable, wherein receiving terminals of said at least two of the plurality of receiving filters are commonalized through the passive circuit. | 11-29-2012 |
20130016634 | ELECTRONIC DUPLEXERAANM SMILEY; RussellAACI RichmondAACO CAAAGP SMILEY; Russell Richmond CA - The present disclosure relates to an electronic duplexer for at least one transmit path and at least one receive path in a radio system where the transmit and receive paths share the use of at least one antenna. A first feedforward correction loop is used to correct broadband noise emissions (that do not include linearity related close-in emissions) from the power amplifier in a radio system. A second feedforward correction loop is used to reduce the interference of the transmit signal in the receive path. A third feedforward correction loop is used to identify interference signals other than the transmit signal and correct those additional interferers. | 01-17-2013 |
20130028148 | MOBILE TERMINAL - A mobile terminal includes a main body and a wireless communication module mounted in the main body. The wireless communication module includes a first transceiver including transmit and receive terminals of a first signal, a second transceiver including transmit and receive terminals of a second signal, a first duplexer connected to the transmit terminal of the first signal and the receive terminal of the second signal to separate a transmit frequency of the first signal from a receive frequency of the second signal, and a second duplexer connected to the receive terminal of the first signal and the transmit terminal of the second signal to separate a receive frequency of the first signal from a transmit frequency of the second signal. | 01-31-2013 |
20130039228 | DUPLEXER WITH ACTIVE TEMPERATURE COMPENSATION - Embodiments disclosed herein relate to programmable duplexers. The frequency pass band of the programmable duplexer is changed according to a selection of a channel-pair to control or maximize the transition band between the receiver path and the transmitter path. The programmable duplexer permits selections of desired pass bands without the need for multiple duplexer filters. | 02-14-2013 |
20130044650 | METHOD AND APPARATUS FOR PROVIDING ELEVATION PLANE SPATIAL BEAMFORMING - In one embodiment, the present disclosure provides a method and apparatus for spatially filtering inter-cell co-channel interference in the elevation plane, which in turn will improve network spectral efficiency. | 02-21-2013 |
20130051286 | ADAPTIVE SYNCHRONOUS PROTOCOL FOR MINIMIZING LATENCY IN TDD SYSTEMS - Systems and methods are presented that offer significant improvements in the performance of time division duplex (TDD) systems by utilizing an adaptive synchronous protocol. Conventional TDD systems are limited because data is transmitted during discreet and limited intervals of time, and because TDD transceivers may not simultaneously transmit and receive for reasons of insufficiently separated frequencies and limited receiver selectivity. Typically, TDD systems have significant latency due to the time to change from transmission to reception and the propagation delay time. By synchronizing the master nodes and the one or more remotes and by scheduling the traffic loads between these nodes, remote nodes may begin transmitting before the master node is finished with its transmission, and vice versa. This method reduces latency and improves the frame efficiency. Further, the frame efficiency may improve as the distance from the master node to the remote node increases. | 02-28-2013 |
20130051287 | RADIO-FREQUENCY FRONT-END MODULE - An RF front-end module includes power amplifiers, transmission-side filters, a reception-side filter, and a switch IC. A first transmission signal is output from a first transmission signal input terminal to a first common terminal via the power amplifier and the transmission-side filter. A second transmission signal is output from a second transmission signal input terminal to a second common terminal via the power amplifier and the transmission-side filter. A first reception signal input from the first common terminal and a second reception signal input from the second common terminal are input via the switch IC to the reception-side filter, common to the first and second reception signals, and are output from the reception-side filter to a reception signal output terminal. | 02-28-2013 |
20130058263 | RADIO COMMUNICATION SYSTEM, RADIO COMMUNICATION METHOD, AND DATA TRANSMITTER - Disclosed is a radio communication system capable of reducing the cost for introducing a system utilizing RFID technology into a radio network environment. A radio communication system pertaining to the present invention includes a first radio equipment that transmits first data using a first radio wave; a data transmitter that outputs a second radio wave generated by modulating the first radio wave depending on second data which is an object for transmission; and a second radio equipment that receives the first and second radio waves and includes a separation and demodulation circuit that separates and demodulates the first data transmitted from the first radio equipment and the second data transmitted from the data transmitter included in the received radio waves. The data transmitter includes an amplifier for generating the second radio wave by amplifying the first radio wave. | 03-07-2013 |
20130089009 | METHOD AND APPARATUS FOR INTERFERENCE CANCELLATION FOR ANTENNA ARRAYS - Embodiments of the claimed subject matter provide methods and apparatuses for interference cancellation. One embodiment of a method includes estimating, for an antenna in an antenna array including a plurality of antennas, interference parameters using analog signals received at the antenna on each of a plurality of subcarriers. Each interference parameter is associated with one of a plurality of symbols transmitted to one of a plurality of users on one of the plurality of subcarriers. This embodiment also includes canceling interference from analog signals received by the antenna on the plurality of subcarriers using the estimated interference parameters. | 04-11-2013 |
20130107763 | DISTRIBUTED ANTENNA SYSTEM USING TIME DIVISION DUPLEXING SCHEME | 05-02-2013 |
20130114469 | Power-Efficient Multi-Mode Transceiver Synthesizer Configurations - Embodiments of the present disclosure provide power-efficient time division duplexing (TDD) mode configurations of frequency division duplexing (FDD) transceivers. Embodiments avoid time slotted operation of the receive and transmit synthesizers, thereby avoiding undesired operation under transient conditions, frequent calibration, and reduced power supply efficiency. In embodiments, a single synthesizer is used to enable TDD operation, thereby reducing power consumption and calibration requirements by approximately 50%. The single synthesizer may be maintained ON at all times, thus allowing the power supply's switching regulator to operate with substantially constant load conditions. | 05-09-2013 |
20130114470 | DUPLEXER WITH ENHANCED ISOLATION - A system includes a transmit filter ( | 05-09-2013 |
20130114471 | AMPLIFIER SUPPORTING MULTI MODE AND AMPLIFYING METHOD THEREOF - An amplifier and an amplifying method are provided. The amplifier includes: an amplifying unit amplifying and transferring a transmission target signal to a TDD switch; the TDD switch transferring a signal received from the amplifying unit to a filter unit when the amplifier operates in a TDD mode, and transferring a signal received from the filter unit to a duplex mode selection switch; the duplex mode selection switch transferring a signal received from the filter unit to a receiving side; and a controller controlling the duplex mode selection switch to transfer the signal received from the filter unit to the receiving side without passing through the TDD switch when the received duplex mode selection signal is a FDD mode selection signal. | 05-09-2013 |
20130128779 | AMPLIFYING CIRCUIT AND WIRELESS COMMUNICATIONS APPARATUS INCLUDING THE SAME - The amplifying circuit includes: an input transistor having a gate electrode connected to a signal input terminal inputting a wireless signal, a drain electrode connected to a power supply terminal, and a source electrode connected to a ground terminal; a first switch installed between the signal input terminal and the gate electrode; and a second switch installed between the power supply terminal and the drain electrode, wherein the input transistor has a predetermined bias voltage applied to the gate electrode thereof to simultaneously turn the first and second switches on during reception of the wireless signal and simultaneously turn the first and second switches off while applying the predetermined bias voltage to the gate electrode during transmission of the wireless signal. | 05-23-2013 |
20130176913 | Method and Apparatus for Time Division Duplex Communication - Embodiments provide a method and apparatus for performing time division duplex communication, such as may be performed over a wireless communications network. In the embodiments a first circuit pathway is used to transmit a first radio frequency signal in a transmission mode and a second circuit pathway is used to receive a second radio frequency signal in a reception mode. In the reception mode, the first radio frequency signal is switched to an alternate circuit pathway. This may be performed by a radio frequency integrated circuit or by other control circuitry. Switching to an alternate circuit pathway reduces leakage of the first radio frequency signal into the second radio frequency signal. | 07-11-2013 |
20130176914 | RF DUPLEXING DEVICE - Radio frequency (RF) duplexing devices and methods of operating the same are disclosed. In one embodiment, an RF duplexing device includes a transmission port, a receive port, a first duplexer, and a second duplexer. The first duplexer is coupled to the transmission port and the receive port, and is configured to provide a first phase shift from the transmission port to the receive port. The second duplexer is also coupled to the transmission port and the receive port. However, the second duplexer is configured to provide a second phase shift that is differential to the first phase shift from the transmission port to the receive port. By providing the second phase shift so that the second phase shift is differential to the first phase shift, the RF duplexing device can provide isolation through cancellation without needing to introduce significant insertion losses. | 07-11-2013 |
20130176915 | HIGH-FREQUENCY MODULE - A compact high-frequency module that increases isolation between a transmission-side circuit and a reception-side circuit of a duplexer includes a switch element and duplexers. The duplexers include transmission-side SAW filters and reception-side SAW filters. The transmission-side SAW filters are mounted near one edge of a multilayer body. The reception-side SAW filters are mounted near another edge opposite to the one edge of the multilayer body. The switch element is mounted at the center of the multilayer body | 07-11-2013 |
20130176916 | HIGH-FREQUENCY MODULE - A small high-frequency module has a structure such that a high-power signal is prevented from leaking to a switch device. On the top surface of a multilayer body, a switch device and a duplexer are mounted so as to be spaced apart from each other by a predetermined distance. An inductor and resistors connected to a circuit different from a transmission system circuit are mounted between the switch device and the duplexer. The inductor and the resistors are mounted such that external connection terminals connected to the switch device are on the switch device side and external connection terminals connected to external connection power system port electrodes of the high-frequency module are on the duplexer side. | 07-11-2013 |
20130188528 | FREQUENCY AGILE FILTER USING A DIGITAL FILTER AND BANDSTOP FILTERING - A method of providing frequency dependent signal attenuation. An RF input signal is split into a first signal portion and a second signal portion. The first signal portion is discrete time filtered and bandstop filtered to provide a filtered signal portion. The second signal portion is applied to a component and a component output signal portion is received from the component. The component output signal portion is combined with the filtered signal portion to provide an RF output signal having frequency dependent attenuation. | 07-25-2013 |
20130188529 | SYSTEMS AND METHODS OF OPERATIONAL MODES FOR A TRANSCEIVER - A transceiver circuit is configured to operate in a first mode of operation and a second mode of operation such that a receive signal propagates from an antenna through a first filter to a low noise amplifier while simultaneously a transmit signal propagates from a power amplifier through a second filter to the antenna when operating in the first mode. The receive signal propagates from the antenna to the low noise amplifier without being filtered while alternating with the transmit signal propagating from the power amplifier to the antenna without being filtered when operating in the second mode. | 07-25-2013 |
20130194978 | Transceiver and Communication Device - A transceiver comprises a receiver, a transmitter, a signal transmission arrangement, a first signal transferring element, and a transformer having magnetically-connected first and second windings. The first signal transferring element is between the transmitter output and the signal transmission arrangement, which is arranged to transmit signals from the transmitter and to receive signals and provide them to the receiver. The first winding of the transformer is connected in parallel with the first signal transferring element, which has input and output impedances so that signals from the transmitter output reach the signal transmission arrangement, while signals from the signal transmission arrangement do not reach the transmitter output. As such, the first signal transferring element is arranged to transfer signals from the transmitter to the signal transmission arrangement such that the transmitter contribution to the signal in the first winding is suppressed. | 08-01-2013 |
20130194979 | OPTIMAL SWITCHING FREQUENCY FOR ENVELOPE TRACKING POWER SUPPLY - A radio frequency (RF) communications system, which includes an RF power amplifier (PA) and an envelope tracking power supply, is disclosed. The RF communications system processes RF signals associated with at least a first RF communications band, which has a first bandwidth. The RF PA receives and amplifies an RF input signal to provide an RF transmit signal using an envelope power supply signal. The envelope tracking power supply provides the envelope power supply signal, which has switching ripple based on a programmable switching frequency. The programmable switching frequency is selected to be greater that the first bandwidth. | 08-01-2013 |
20130201883 | MULTI-RADIO COEXISTENCE - In a multi-radio user equipment (UE) for wireless communication, potential interference between the individual radios may be managed through the use of configurable logical connections between the radios. The connections send signals among the radios to indicate when a particular radio is active. The connections may be configured to indicate different activity types among the radios based on the operating conditions of the radios. | 08-08-2013 |
20130201884 | METHOD AND APPARATUS FOR COEXISTENCE AMONG WIRELESS TRANSMIT/RECEIVE UNITS (WTRUS) OPERATING IN THE SAME SPECTRUM - A method and apparatus for coexistence among wireless transmit/receive units (WTRUs) operating in the same spectrum are disclosed. A WTRU includes a memory, a receive unit, a transmit unit and a control unit. The memory stores coexistence gap patterns. Each of the coexistence gap patterns defines a pattern of transmission periods and silent periods for the WTRU and corresponds to a respective duty cycle. The receive unit receives from a base station information regarding a duty cycle for a wireless cell operated by the base station. The control unit selects one of the coexistence gap patterns based on the received information regarding the duty cycle for the wireless cell and controls the transmit unit to transmit information during the transmission periods and not transmit information during the silent periods of the selected one of the plurality of coexistence gap patterns. | 08-08-2013 |
20130215800 | METHOD AND ARRANGEMENT FOR FEEDER SHARING IN A TELECOMMUNICATION SYSTEM - A filter arrangement comprises a first terminal that handles duplex radio antenna feeder signals for at least two transceiver modules, a second terminal that handles at least duplex signals for a first transceiver module, a third terminal that outputs a first multi carrier power amplifier system input signal, the input signal representing a transmit signal from the first transceiver module, and a fourth terminal that receives a multi carrier power amplifier system output signal. The output signal includes an amplified representation of the transmit signals from the two transceiver modules. The first and second terminals are connected via first a single filter, the second and third terminals are connected via a second single filter, and the fourth and first terminals are connected via a third single filter. | 08-22-2013 |
20130229952 | METHOD AND APPARATUS FOR AVOIDING INTERFERENCE BETWEEN MULTIPLE RADIOS IN A USER EQUIPMENT - In accordance with an example embodiment of the present invention, an apparatus, comprising at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least the following: deciding to switch to a half-duplex mode of operations upon detecting a triggering condition including that multiple radio stacks are activated at the apparatus simultaneously; signaling an associated base station the decision of switching to the half-duplex mode half-duplex mode; and entering the half-duplex mode of operation, is disclosed. | 09-05-2013 |
20130242812 | SUPPORT FOR ASYNCHRONOUS ADAPTATION TO UPLINK AND DOWNLINK TRAFFIC DEMANDS FOR WIRELESS COMMUNICATION - Technology is discussed to allow transmission points within a Wireless Wide Area Network (WWAN) to adapt to Up Link (UL) and Down Link (DL) traffic demands independently. To mitigate potential interference arising from transmission points scheduled for conflicting UL and DL transmissions, measurements between transmission points can be made to indicate a level of coupling. Based on the various levels of coupling between transmission points, clusters can be formed. Where a high level of coupling is present, transmission points can be included in a common cluster. Where a low level of coupling is present, they can be isolated. Transmission points within the same cluster are scheduled with a common pattern of UL and DL transmissions to avoid interference. Transmission points in different clusters can have different patterns of UL and DL transmission to independently adapt to the relative demands for UL and DL transmissions experienced within these different clusters. | 09-19-2013 |
20130250819 | CARRIER AGGREGATION FRONT END ARCHITECTURE - Radio frequency (RF) front end circuitry includes a notch diplexer. The notch diplexer includes a high pass filter coupled between a high band port and an antenna port, and a low pass notch filter coupled between a low band port and the antenna port. The high pass filter is adapted to receive a high band receive signal having a high band carrier frequency at the antenna port, and pass the high band receive signal to the high band port. The low pass notch filter is adapted to receive a low band transmit signal having a low band carrier frequency at the low band port, and attenuate distortion in the low band transmit signal about a notch stop band before passing the low band transmit signal to the antenna port. According to one embodiment, the notch stop band includes the high band carrier frequency. | 09-26-2013 |
20130265912 | Antenna and RF Front-end Arrangement - An antenna and RF front-end arrangement include at least one LTE or WCDMA Tx&Rx antenna, one MIMO Rx or diversity antenna adapted for low band LTE or WCDMA and one MIMO Rx or diversity antenna adapted for high band LTE or WCDMA. At least one of the MIMO Rx or diversity antennas is adapted for transmitting and receiving WLAN and/or BlueTooth signals. Therefore, a dedicated WLAN antenna is not required and the number of antennas can be reduced. | 10-10-2013 |
20130272168 | REDUCING TRANSIENT EFFECTS WHEN CHANGING TRANSMIT CHAIN POWER - A method, an apparatus, and a computer program product for a wireless communication device are provided. The apparatus determines a receive timing for receiving through at least one receive chain element. The apparatus determines a time to turn on/off at least one transmit chain element based on the determined receive timing and based on receiver impact to the at least one receive chain element caused by turning on/off the at least one transmit chain element. The apparatus reduces receiver impact to the at least one receive chain element by turning on/off the at least one transmit chain element at the determined time. | 10-17-2013 |
20130294295 | TRANSMIT SIGNAL CANCELATION APPARATUS AND METHODS - Apparatus and methods disclosed herein implement an RF receive-band filter at a receive chain input of a wireless base station with a co-located transmitter and receiver. The RF receive-band filter includes an adaptive filter component to perform filtering operations on samples of a digital baseband or intermediate frequency signal x(n) from a transmit chain associated with the wireless base station. An adaptive filter transfer function is determined in real time such that samples of the baseband transmit signal x(n) are transformed into a cancellation baseband signal z(n). The digital cancelation baseband signal z(n) is then digital-to-analog converted and the resulting analog baseband signal z(t) is up-converted to obtain a subtractive RF cancelation signal c(t). C(t) is summed with a desirable received signal RF component r(t) and an undesirable transmitter leakage RF signal component l(t) appearing at the input to the base station receiver. C(t) cancels l(t), leaving r(t) to be processed by the receiver section of the base station. | 11-07-2013 |
20130301487 | Full Duplex Wireless Transmission with Self-Interference Cancellation - Two-way (full-duplex) wireless communications. Various embodiments measure interference channels and provide for interference cancellation in both analog and digital domains to mitigate self-interference. The system supports multiple clients wherein new clients can join the network asynchronously, and also supports Multiple-Input Multiple-Output (MIMO) antennas. | 11-14-2013 |
20130301488 | SYSTEMS AND METHODS FOR CANCELLING INTERFERENCE USING MULTIPLE ATTENUATION DELAYS - A wireless communication device includes, in part, at least one antenna for receiving or transmitting a signal, and a cancelation circuit adapted to cancel or reduce the self-interference signal. The cancelation circuit includes, in part, a control block, N delay and attenuation paths, a combiner, and a subtractor. Each path includes a delay element and a variable attenuator whose attenuation level varies in response to a control signal generated by the control block. Each path receives a sample of the transmit signal and generates a delayed and attenuated (weighted) version of the sample signal. The combiner combines the N delayed and weighted versions of the sample signal to construct a signal representative of the self-interference signal. The subtractor subtracts the constructed signal from the received signal thereby the cancel or reduce the self-interference signal therefrom. | 11-14-2013 |
20130308502 | Wireless Device with Multi-Port Distributed Antenna - Methods and systems for an on-chip and/or on-package T/R switch and antenna are disclosed and may include selectively coupling one or more low noise amplifiers (LNAs) and/or one or more power amplifiers (PAs) to one or more ports of a multi-port distributed antenna utilizing configurable transmit/receive (T/R) switches integrated on a chip with the LNAs and PAs. The LNAs and PAs may be impedance matched to the antenna by coupling them to a port based on a characteristic impedance at the port. The T/R switches may be integrated on a package to which the chip may be coupled. The signals transmitted and received by the antenna may be time division duplexed. The antenna, which may include a microstrip antenna, may be integrated on the chip or the package. The LNA and the PA may be coupled to different ports on the antenna via the T/R switches. | 11-21-2013 |
20130329611 | HIGH-FREQUENCY MODULE - In a high frequency module, mounting lands for reception signal output side ports of SAW duplexers, respectively, on a top surface of a multilayer body are arranged so as to be superposed on reception side external connection lands on a bottom surface of the multilayer body along the layer direction and the mounting lands are directly connected to the reception side external connection lands via holes. Transmission side external connection lands are located on the bottom surface of the multilayer body. The transmission side external connection lands are connected to mounting lands for transmission signal input side ports on the top surface of the multilayer body via certain inner layer electrodes that do not come close to the via holes of the reception system and the via holes. | 12-12-2013 |
20130343235 | FULL-DUPLEX WIRELESS COMMUNICATION SYSTEM USING POLARIZATION - A system, apparatus, and method use full duplexing with polarization. A wireless communication system includes a first transceiver configured to transmit and receive wireless signals to and from at least a second transceiver. The first transceiver includes a plurality of transmitter antennas and a plurality of receiver antennas. At least one of the transmitter antennas is configured to transmit a first signal with a first polarization weight to at least the second transceiver. At least one of the receiver antennas is configured to receive a second signal with a second polarization from the second transceiver. The second polarization is cross polarized with the first polarization. | 12-26-2013 |
20130343236 | RADIO COEXISTENCE IN WIRELESS NETWORKS - Technology for reducing interference in collocated radios is disclosed. One method comprises identifying a repeating transmit/receive (Tx/Rx) pattern for multiple radios located in a mobile communication device having a Bluetooth radio collocated with an OFDMA radio. A persistent reservation is requested for at least one sub-frame from the OFDMA radio when the repeating Tx/Rx pattern indicates a Bluetooth packet wherein the Bluetooth radio can not transmit without interference with the OFDMA radio. The repeating Tx/Rx pattern is modified based on the persistent reservation. The Bluetooth radio can communicate based on the modified repeating Tx/Rx pattern to enable interference free communication for the Bluetooth radio and the OFDMA radio in the multi-radio mobile communication device. A collocated WiFi radio's transceiver can align its Tx/Rx with the Tx/Rx pattern, and transmit and receive at the same time slots that other collocated radios are transmitting, and receiving. | 12-26-2013 |
20130343237 | Front End Module With Tone Injection - A radio front end includes a power amplifier, a tone injection module, a duplexer, a balancing network, and a processor. The tone injection module is operable, in a first mode, to produce a tone having a carrier frequency that is substantially similar to a carrier frequency of an inbound wireless signal. The duplexer is operable, in the first mode, to provide electrical isolation between the outbound wireless signal and a combination signal of the tone and inbound wireless signal and is operable, in a second mode, to provide electrical isolation between the outbound wireless signal and the inbound wireless signal. The processor is operable to determine an amplitude of a tone component of the combination signal; correlate the amplitude of the tone component to an inbound frequency band isolation; and adjust baseband processing of a down converted representation of the combination signal based on the inbound frequency band isolation. | 12-26-2013 |
20140016515 | SYSTEM AND METHOD FOR FULL DUPLEX CANCELLATION - Disclosed herein are systems, methods, and computer-readable storage media for enabling improved cancellation of self-interference in full-duplex communications, or the transmitting and receiving of communications in a single frequency band without requiring time, frequency, or code divisions. The system estimates the signal strength and phase of a self-interference signal, generates a cancellation signal based on this estimate, then uses the cancellation signal to suppress the self-interference before sampling received analog signal. After applying the cancellation signal, the system samples and digitizes the remaining analog signal. The digitized signal is then subjected to additional digital cancellation, allowing for extraction of the desired signal. | 01-16-2014 |
20140016516 | SYSTEM AND METHOD FOR MEDIUM ACCESS CONTROL ENABLING BOTH FULL-DUPLEX AND HALF-DUPLEX COMMUNICATIONS - Disclosed herein are systems, methods, and non-transitory computer-readable storage media for a modified MAC protocol which can facilitate communications with both full-duplex and half-duplex devices. A system configured according to the disclosed method can enable communications between an Access Point (AP) and a client in either full duplex or half duplex. The system can similarly enable peer-to-peer communications in both full duplex and half duplex communication modes. | 01-16-2014 |
20140016517 | DE-MULTIPLEXING A RADIO FREQUENCY INPUT SIGNAL USING OUTPUT TRANSFORMER CIRCUITRY - The present disclosure relates to de-multiplexing at least one RF input signal feeding RF power amplifier circuitry to create multiple de-multiplexed RF output signals, which may be used to provide RF transmit signals in an RF communications system. Output transformer circuitry is coupled to outputs from the RF power amplifier circuitry to provide the de-multiplexed RF output signals, which may support multiple modes, multiple frequency bands, or both. The de-multiplexed RF output signals may be used in place of RF switching elements in certain embodiments. As a result, RF front-end switching circuitry in the RF communications system may be simplified, thereby reducing insertion losses, reducing costs, reducing size, or any combination thereof. Additionally, the output transformer circuitry may provide load line transformation, output transistor biasing, or both to the RF power amplifier circuitry. | 01-16-2014 |
20140022958 | PRINTED CIRCUIT BOARD AND DIPLEXER CIRCUIT - A printed circuit board | 01-23-2014 |
20140029480 | TRANSCEIVER FILTER AND TUNING - A radio transceiver including a transmitter and a receiver. A filter coupled to an output of the transmitter, the filter has one or more inductors and one or more capacitors, where the filter is tuned by varying one or more capacitance values of the one or more capacitors in the filter to tune the filter. The one or more capacitors are Barium Strontium Titanate (BST) ceramic integrated capacitors that are each tuned by application of a bias voltage thereto. A filter tuner circuit is configured to apply the bias voltage to the one or more capacitors, where the bias voltage is initially established as a stored initial value, and where the bias voltage is refined by a proportional-integral-derivative (PID) controller configured to optimize a power within the transceiver. This abstract is not to be considered limiting since various implementations may incorporate more, fewer or different elements. | 01-30-2014 |
20140029481 | TRANSCEIVER FILTER AND TUNING - A radio transceiver including a transmitter and a receiver. A filter coupled to an output of the transmitter, the filter has one or more inductors and one or more capacitors, where the filter is tuned by varying one or more capacitance values of the one or more capacitors in the filter to tune the filter. The one or more capacitors are Barium Strontium Titanate (BST) ceramic integrated capacitors that are each tuned by application of a bias voltage thereto. A filter tuner circuit is configured to apply the bias voltage to the one or more capacitors, where the bias voltage is initially established as a stored initial value, and where the bias voltage is refined by a proportional-integral-derivative (PID) controller configured to optimize a power within the transceiver. This abstract is not to be considered limiting since various implementations may incorporate more, fewer or different elements. | 01-30-2014 |
20140029482 | SIMULTANEOUS BIDIRECTIONAL TRANSMISSION FOR RADIO SYSTEMS - Disclosed are methods, systems, and apparatus for maximizing the spectral efficiency of a communications spectrum by providing a means to transmit information continuously in both directions of a radio link on the same center frequency at any given time. One embodiment may be directed to a method of communicating in a point-to-point radio system. The method may include receiving a first signal at a first antenna of a radio head. The first signal may include a transmitted data signal and interfering signals. The method continues by determining a correction signal from a transmitter of the radio head and processing the first signal to remove the interfering signals using the correction signal, and sending a second signal using a second antenna. The first and second signals may be sent and received at substantially the same time. | 01-30-2014 |
20140036736 | PIM COMPENSATION IN A RECEIVER - The present disclosure relates to compensation for Passive Intermodulation (PIM) distortion in a receiver. In one embodiment, a main receiver receives a radio frequency receive signal and outputs a main receiver output signal. In order to compensate for PIM distortion, a tunable non-linear circuit generates an Intermodulation Products (IMP) signal that includes a number of IMPs as a function of a signal that is indicative of the radio frequency transmit signal. An auxiliary receiver receives the IMP signal and outputs an auxiliary receiver output signal that includes only a subset of the IMPs that fall within a passband of the main receiver. The auxiliary receiver output signal is adaptively filtered to provide a PIM estimate signal, which is then subtracted from the main receiver output signal to provide a compensated output signal. | 02-06-2014 |
20140044021 | TUNABLE INTER-ANTENNA ISOLATION - A method and system performs antenna tuning to minimize interference affecting signal reception within a wireless communication device. An antenna tuner controller determines whether the wireless communication device concurrently provides (a) simultaneous signal transmission and reception and (b) dual signal propagation. In response to determining that the wireless communication device concurrently provides the simultaneous signal transmission and reception and the dual signal propagation, the antenna tuner controller determines a current mode of operation corresponding to simultaneous signal transmission and reception and the dual signal propagation. Based on the mode of operation determined, the antenna tuner controller identifies a priority for performing antenna isolation to minimize interference affecting signal reception when the wireless communication device actively communicates within the specific mode of operation. In response to the identifying the priority for performing antenna isolation, the antenna tuner controller performs antenna impedance tuning that provides antenna isolation corresponding to the priority. | 02-13-2014 |
20140044022 | HIGH-FREQUENCY CIRCUIT AND COMMUNICATION DEVICE - A high-frequency circuit includes: first duplexers, each including a first transmit filter having a first transmit band, a first receive filter having a first receive band, and a first common terminal to which first ends of the first transmit filter and the first receive filter are commonly connected; a first switch that selects and connects one of the first common terminals to a first antenna; an LPF or BPF that is connected between the first antenna and the first switch, and passes a signal in the first transmit band and the first receive band; and a second duplexer including: a second transmit filter having a second transmit band, a second receive filter having a second receive band, and a second common terminal that is connected to a second antenna and to which first ends of the second transmit filter and the second receive filter are commonly connected. | 02-13-2014 |
20140044023 | Methods and Network Nodes in a Telecommunication System - A method in a user equipment ( | 02-13-2014 |
20140050124 | FULL DUPLEX SYSTEM WITH SELF-INTERFERENCE CANCELLATION - An apparatus and method enable a full duplex system with self-interference cancellation. Receiving circuitry forming a signal receiving path is arranged for transferring communication signals received via air interface. Transmitting circuitry forming a signal transmission path is arranged for transferring communication signals to be transmitted via air interface. Interference cancellation circuitry is in operable connection between the signal receiving path and the signal transmission path. The receiving circuitry and the transmitting circuitry are arranged to receive and transmit communication signals at the same time and at the same frequency. The interference cancellation circuitry comprises resistance, inductance and capacitance arranged to constitute a center frequency of an isolation range between the signal receiving path and the signal transmission path which substantially falls into the center of a communication band for the signals received and/or to be transmitted via air interface. | 02-20-2014 |
20140056183 | HIGH-FREQUENCY CIRCUIT MODULE - Provided is a high-frequency circuit module that has high mounting density. In a high-frequency circuit module, an RFIC that performs transmission and reception processes for high-frequency signals, a power amplifier IC that amplifies a transmission signal from the RFIC, and a duplexer that separates a transmission signal outputted from the power amplifier IC to an antenna and a reception signal that is inputted from the antenna to the RFIC are formed on the top surface thereof. The duplexer is disposed between the RFIC and the power amplifier IC. | 02-27-2014 |
20140078940 | SYSTEM AND METHOD FOR FULL-DUPLEX MEDIA ACCESS CONTROL USING REQUEST-TO-SEND SIGNALING - A system and method for full-duplex communications provided by modifying the Media Access Control sub-layer of communication node protocols. The modification allows communication nodes to communicate with one another in full-duplex, where each node transmits and receives data simultaneously with other nodes in a single frequency. A timing of the simultaneous data transmissions, acknowledgments, and short-interframe-space waiting periods can be determined based on network-allocation-vector data transmitted in association with request-to-send or clear-to-send signals. | 03-20-2014 |
20140086109 | BYPASSING DUPLEX FILTER - The disclosed invention relates to a transceiver system having a bypass signal path that enables low power consumption. The transceiver system has transmission path and a reception path. The transmission path provides a signal from a transmission chain to an antenna for wireless transmission. The reception path provides a signal from the antenna to a reception chain. A duplex filter that provides isolation between the transmission and reception paths is connected between the antenna and the transmission and reception paths. A bypass signal path selectively exchanges signals between the transmission chain and the antenna along a conductive path that bypasses the duplex filter. By using the bypass signal path to selectively exchange signals between the transmission chain and the antenna the insertion loss of the duplex filter can be mitigated, allowing for the transceiver system to operate at a lower power. | 03-27-2014 |
20140105074 | NODE IN A WIRELESS COMMUNICATION SYSTEM, THE NODE HAVING DIFFERENT FUNCTIONAL MODES - The present invention relates to a node ( | 04-17-2014 |
20140112214 | TRANSMISSION ANGLE CONTROL DEVICE, BASE STATION, TRANSMISSION ANGLE CONTROL METHOD, AND PROGRAM - A transmission angle control device in a wireless communication system based on a TDD scheme includes: an interference signal detection unit that detects a level of interference on a second base station caused by a signal transmitted by a first base station based on a received signal received from the second base station and that outputs the interference level as an interference information signal; and a transmission angle determining unit that adjusts a transmission angle of a signal transmitted by the first base station in a vertical direction according to the interference information signal. | 04-24-2014 |
20140119244 | COGNITIVE RADIO RF FRONT END - Embodiments are directed to a circuit comprising separately tunable receive and transmit frequency bands, wherein the circuit is configured to minimize undesired transmitter signals in a receiver path by dynamically adjusting an input to a receiver low noise amplifier by using a transmit baseband conversion signal and a transmit output signal from a transmit power amplifier as feedback to the receiver low noise amplifier. | 05-01-2014 |
20140119245 | SHARED LTE-ISM RF FRONT-END AND ANTENNA - A front-end module and antenna can be shared between two radio transceivers operating in coexistent radio frequency (RF) communication bands. For example, a first of the two radio transceivers may operate in one of a Long Term Evolution (LTE) band or an Industrial Scientific Medical (ISM) band, while a second of the two radio transceivers may operate in an alternative one of the LTE band and the ISM band. Use of a diplexer in the shared front-end module to pass RF signals between the two radio transceivers and the shared antenna can allow for sufficient isolation to avoid interference between transmit and receive operations in the coexistent RF communication bands. | 05-01-2014 |
20140133365 | Indication And Processing Method And Device For Resource Occupancy Mode - There is disclosed a method of indicating a resource occupancy scheme and processing a resource occupancy scheme indicator so as to enable a UE to be aware a resource occupancy scheme of the network side and avoid an unnecessary power waste and unnecessary interference, and in the method, a base station generates a corresponding resource indicator for a resource occupancy scheme of a legacy control resource area and an enhanced control resource area in each downlink subframe to be transmitted in a specific periodicity and sends the resource indicator to a UE in a resource indication message, and the UE determines from the obtained resource indicator the resource occupancy scheme of the legacy control resource area and the enhanced control resource area in each downlink subframe to be transmitted in the specific periodicity and performs a corresponding resource handling mode, so that the UE can blindly detect in PDCCH common and user spaces or receive control information carried on PHICH resource at an accurate position to thereby avoid an unnecessary power waste of and unnecessary interference to the UE due to blind detection or reception and improve effectively the performance of a system. | 05-15-2014 |
20140133366 | APPARATUS AND METHOD FOR UPLINK POWER CONTROL FOR VARIABLE INTERFERENCE CONDITIONS - According to an example embodiment of this application, a method may include by a processor, processing communication with a network element, the communication comprising one or more frames, wherein each frame comprises at least two subframes; receiving a signaling indicating definition of subframe groups; receiving a power control command for controlling a transmission power; and applying the power control command. | 05-15-2014 |
20140140250 | METHOD AND SYSTEM FOR MITIGATING THE EFFECTS OF A TRANSMITTED BLOCKER AND DISTORTIONS THEREFROM IN A RADIO RECEIVER - A radio receiver processing path has a mixer with active interference/blocker cancellation to reduce the intensity of leaked and undesired signals by using a replica of the transmitted signal, emulating the phase and attenuation through the leakage path and subtracting the emulated signal within the mixer. Intermodulation distortions are predicted through the use of nonlinear modeling in the digital baseband between the baseband transmitter and baseband receiver and subsequently subtracted from the received signal. The nonlinear basis functions are combined to model the composite nonlinearity in the signal path based on digital baseband transmitted data. The modeled nonlinearity is subtracted from the received signal, and the result is observed and used to guide the nonlinear modeling parameters using self-contained control loops. | 05-22-2014 |
20140146717 | LOW-LOSS LARGE-SIGNAL ELECTRICAL BALANCE DUPLEXER - A circuit for a large-signal electrical balance duplexer (EBD) may include a circulator that can be configured to couple an output node of a transmit (TX) path to an antenna. An EBD circuit may be coupled to the circulator, at a first port of the EBD circuit. The EBD circuit may be configured to isolate the circulator from one or more input nodes of a receive (RX) path. An attenuator may be coupled between the output node of the TX path and a second port of the EBD circuit. The attenuator may be configured to provide an attenuated signal to the EBD circuit. | 05-29-2014 |
20140146718 | ELECTRICAL BALANCE DUPLEXER FOR CO-EXISTENCE AND CONCURRENT OPERATION OF MORE THAN ONE WIRELESS TRANSCEIVERS - A circuit for a common electrical balance duplexer (EBD) of a multi-path transceiver may include an EBD circuit. The EBD circuit may be coupled to output nodes of two or more transmit (TX) paths, one or more antennas, and input nodes of two or more receive (RX) paths. The EBD circuit may be configured to isolate the TX paths from the RX paths, and to provide low-loss signal paths between the output nodes of the transmit (TX) paths and one or more antennas. One or more balancing networks may be coupled to the EBD circuit to provide one or more impedances, each matching a corresponding impedance associated with one of the antennas. The output nodes of the transmit (TX) paths may include output nodes of a first and a second power amplifier (PA). The first and the second PA may share a matching transformer that is merged with the EBD circuit. | 05-29-2014 |
20140146719 | METHODS, APPARATUSES AND COMPUTER PROGRAM PRODUCTS FOR INTERFERENCE MITIGATION VIA CHANNEL RESERVATION IN LA TDD NETWORK - Apparatuses, methods and computer program products are proposed, by which resource elements in an uplink transmission of a user equipment are determined, on which interference may be caused and which are to be muted in the uplink transmission, and wherein the user equipment is configured to mute resource elements based on the determined resource elements. | 05-29-2014 |
20140169235 | WIDE BAND ELECTRICAL BALANCE DUPLEXER WITH BALANCED BRIDGE CIRCUIT - A circuit for a wideband electrical balance duplexer (EBD) may include a first impedance element and a second impedance coupled between a first and a second node and a second and a third node of the bridge circuit, respectively. An antenna may be coupled between the first and a fourth node of the bridge circuit to receive and transmit RF signals. A balancing network may provide an impedance substantially matching an impedance of the antenna. The balancing network may be coupled between the third and the fourth node of the bridge circuit. The first or the second impedance elements may facilitate balancing the bridge circuit. One or more output nodes of a transmit path may be coupled to an input node of the bridge circuit. One or more input nodes of a receive path may be coupled between the second and the fourth node of the bridge circuit. | 06-19-2014 |
20140169236 | FEED FORWARD SIGNAL CANCELLATION - A circuit that cancels a self-interference signal includes, in part, a pair of signal paths that are substantially in phase, each of which paths includes a passive coupler, a delay element and a variable attenuator. The circuit further includes, in part, a first group of P signal paths each of which is substantially in phase with the pair of paths, and a second group of M signal paths each of which is substantially out-of-phase relative to the pair of signal paths. Each of the P and M signal paths includes a delay element and a variable attenuator. Furthermore, (P−1) signal paths of the first group of P signal paths, and (M−1) signal paths of the second group of M signal paths include a passive coupler. Optionally, each of the M signal paths is optionally 180° out-of-phase relative to the pair of signal paths. | 06-19-2014 |
20140169237 | CIRCUIT FOR BASEBAND HARMONIC REJECTION - A circuit for reducing counter-intermodulation in a modulated signal caused by an oscillator frequency and harmonics of a baseband signal is disclosed. The circuit comprises a first and a second baseband section arranged for generating a first and a second version of a baseband signal, the second version being phase shifted with respect to the first version. The circuit further comprises three signal paths comprising mixers for multiplication of the first and second version of the baseband signal with a local oscillator signal, so that three upconverted signals with rotated phase with respect to each other are obtained, and arranged for applying a scaling with a scaling factor corresponding to the rotated phases. The circuit further comprises a combination unit arranged for combining the three upconverted signals. | 06-19-2014 |
20140177483 | REDUCING INTERFERENCE IN A WIRELESS NETWORK - Managing interference in a wireless network is disclosed. A signal quality level may be determined of a downlink signal on a downlink channel associated with an uplink channel of a first network element. Determination of an interference potential between the first network element and the second network element from the signal quality level may be performed. Adapting a network parameter associated with the downlink channel in response to the determined interference potential may be performed. | 06-26-2014 |
20140198688 | Method and Apparatus for Reducing Self Interference - A method, apparatus, and computer program product are provided to reduce self-interference in a transceiver. In the context of a method, a self-interference channel estimate may be determined. A reconstructed interference may further be determined based at least in part on the self-interference channel estimate and a signal to be transmitted and the reconstructed self-interference is caused to be subtracted from a received signal. According to a further embodiment, detection of a desired signal may be disabled while this process is repeated until a residual self-interference is below a threshold, at which point detection of the desired signal may be enabled. | 07-17-2014 |
20140204808 | TUNING ALGORITHM FOR MULTI-TAP SIGNAL CANCELLATION CIRCUIT - A self-interference signal cancellation circuit includes a transmitter for transmitting a transmit signal, a plurality of signal paths, a controller, and a receiver for receiving a signal. Each signal path includes a delay element and a variable attenuator having attenuation levels set by the controller. A combiner generates an output signal by combining outputs of the signal paths. The circuit computes a matrix based on first and second output signals associated with first and second attenuation levels. The controller concurrently varies the attenuation level of each signal path so that a product of the matrix and the attenuation levels of the signal paths is substantially equal to the received signal. The circuit may iteratively compute the matrix using different transmit signal frequencies or with an FFT. The controller iteratively varies the attenuation level of the attenuators until a sum of the product and the received signal satisfies a predefined condition. | 07-24-2014 |
20140219139 | SIGNAL CANCELLATION USING FEEDFORWARD AND FEEDBACK PATHS - A circuit that cancels a self-interference signal includes, in part, a pair of signal paths that are substantially in phase, each of which paths includes a passive coupler, a delay element and a variable attenuator. The circuit further includes, in part, a first group of P signal paths each of which is substantially in phase with the pair of paths, a second group of M signal paths each of which is substantially out-of-phase relative to the pair of signal paths, and at least a pair of feedback paths. Each of the P and M signal paths, as well as the feedback paths includes a delay element and a variable attenuator. Optionally, each of the M signal paths is optionally 180° out-of-phase relative to the pair of signal paths. | 08-07-2014 |
20140219140 | DISTRIBUTED ANTENNA SYSTEM USING TIME DIVISION DUPLEXING SCHEME - A communication system includes a master host unit that communicates wireless spectrum with a service provider interface using analog spectrum. Master host unit communicates digitized spectrum in N-bit words over a digital communication link. Master host unit converts between analog spectrum and N-bit words of digitized spectrum. Communication system includes hybrid expansion unit coupled to master host unit by digital communication link. Hybrid expansion unit communicates N-bit words of digitized spectrum with master host unit across digital communication link. Hybrid expansion unit converts between N-bit words of digitized spectrum and analog spectrum. Hybrid expansion unit communicates analog spectrum across analog communication link to analog remote antenna unit. Analog remote antenna unit communicates wireless signals using first antenna. Communication system further includes a switch in a data path between service provider interface and antenna. The switch selects between transmit path and receive path in response to switching control signal. | 08-07-2014 |
20140219141 | METHOD AND APPARATUS FOR TIME DIVISION DUPLEX COMMUNICATION - Embodiments provide a method and apparatus for performing time division duplex communication, such as may be performed over a wireless communications network. In the embodiments a first circuit pathway is used to transmit a first radio frequency signal in a transmission mode and a second circuit pathway is used to receive a second radio frequency signal in a reception mode. In the reception mode, the first radio frequency signal is switched to an alternate circuit pathway. This may be performed by a radio frequency integrated circuit or by other control circuitry. Switching to an alternate circuit pathway reduces leakage of the first radio frequency signal into the second radio frequency signal. | 08-07-2014 |
20140233436 | FULL-DUPLEX COMMUNICATION APPARATUS AND METHOD - An embodiment of the present invention discloses a full-duplex communication apparatus, including at least one transmit antenna and at least one signal synthesizing apparatus, where the signal synthesizing apparatus is connected to at least two receive antennas, the at least one transmit antenna is configured to transmit a first transmit signal, the at least two receive antennas are configured to separately receive the first transmit signal, and the signal synthesizing apparatus is configured to receive the first transmit signal from the at least two receive antennas, where a phase difference exists between the received first transmit signals, and synthesize the received first transmit signals, where strength of the synthesized first transmit signal is lower than strength of at least one of the first transmit signals received by the signal synthesizing apparatus. | 08-21-2014 |
20140241217 | HEADSET DEVICE, HEADSET, AND METHOD FOR PROCESSING SIGNAL BY USING HEADSET DEVICE - Disclosed are a headset device, a headset, and a method for processing a signal by the headset device. The headset device comprises: a first interface, a second interface, a switch and an isolation unit. The isolation unit comprises a first isolation body and a second isolation body connected to the first isolation body in parallel. The first interface is connected to the second interface through the isolation unit, wherein the first interface is configured to connect to a ground network of the headset, and the second interface is configured to connect to a ground line of a mobile terminal where the headset device is located. Through the disclosure, FM interference is reduced while TDD noise interference is reduced, thus user experience is improved. | 08-28-2014 |
20140247757 | MULTI-TAP ADAPTIVE FILTER FOR TRANSMIT SIGNAL LEAKAGE CANCELLATION - Exemplary embodiments are directed to systems, devices, and methods for mitigating effects of transmit signal leakage. A transceiver may include a transmitter and a receiver. The transceiver may further include a multi-tap analog adaptive filter coupled to each of the transmitter and the receiver and configured to generate an estimated transmit leakage signal based on at least a portion of a transmit signal from the transmitter and an error signal from the receiver. | 09-04-2014 |
20140269449 | FULL-DUPLEX WIRELESS TRANSCEIVER WITH HYBRID CIRCUIT AND RECONFIGURABLE RADIATION PATTERN ANTENNA - A method and circuit are provided that solve the problem of prolonged signal fading in transceivers utilizing dual antenna match in a hybrid transmitter-receiver cancellation circuit, thereby enabling practically implementable full-duplex single channel, or duplexerless frequency division duplex (FDD), wireless communication systems. The method includes controlling dynamic change in signal's amplitude and phase at the receiver port of a hybrid Tx-Rx circuit by continuously varying radiation pattern parameters of at least one antenna, while maintaining nearly constant impedance at the hybrid's antenna interface ports and equalizing propagation delays between the hybrid circuit and both antennas, using a novel circuit design. | 09-18-2014 |
20140286201 | MOBILE COMMUNICATION METHOD, RADIO BASE STATION, AND MOBILE STATION - A duplexer D | 09-25-2014 |
20140286202 | BEAMFORMING WITH PHASE COMPENSATION - A method and a base station for phase compensation in beamforming in a multi-antenna Time Division Duplex (TDD) communication network. In a first transmission mode, the base station estimates a first phase shift between a first antenna port and a reference antenna port in uplink based on a measurement of a first Sounding Reference Signal (SRS). Then the base station estimates in the first transmission mode a second phase shift between the first antenna port and the reference antenna port in downlink based on a Channel State Information (CSI) feedback from a User Equipment (UE), and calculates a parameter indicative of a difference between the first phase shift and the second phase shift. | 09-25-2014 |
20140286203 | Channel sharing within wireless communications - A wireless communication device includes communication interface configured to receive and transmit signals and a processor configured to generate and process such signals. The communication interface of the wireless communication device is configured to receive a first signal from a first other wireless communication device, and the processor of the wireless communication device is configured to process the first signal to determine one or more concurrent transmission parameters. The processor of the wireless communication device is configured to generate the second signal based on the one or more concurrent transmission parameters and direct the communication interface to transmit the second signal to a second other wireless communication device during receipt of the first signal from the first other wireless communication device. The wireless communication device may be configured to make such concurrent transmissions based on one or more considerations such as the power level of the first signal. | 09-25-2014 |
20140286204 | HIGH ISOLATION SIGNAL ROUTING ASSEMBLY FOR FULL DUPLEX COMMUNICATION - A signal routing assembly accepts a first transmission signal at an input and outputs a substantial portion of the signal at a common port of the signal routing assembly. A second transmission signal is received at the common port and is routed through the signal routing assembly delivered to output of the signal routing assembly. Leakage signals from routing devices leaking the first transmission signal are terminated inside the signal routing assembly. Leakage signals from a divider/combiner are cancelled by reflect signal from at least one reflector device. A transmitter produces the first transmission signal and the signal routing assembly delivers this signal to the common port of the signal routing assembly. In full duplex operation, second transmission signals received at the common port are routed to the output to be applied to a receiver. | 09-25-2014 |
20140293841 | RF Front End Arrangement and Method for Sharing First and Second Antennas by Different Frequency Bands - An RF front end arrangement comprises first filtering, second filtering, third filtering, fourth filtering and a switching arrangement. The switching arrangement is configured to selectively connect the filtering to plural antennas such that at a particular time the first and third filtering is connected to a first antenna and the second and fourth filtering is connected to a second antenna. This allows filtering with different frequency response characteristics to be in use simultaneously for the same frequency band. This can reduce the insertion loss associated with a signal path. | 10-02-2014 |
20140301251 | INTERFERENCE CANCELLATION/SUPPRESSION IN TDD WIRELESS COMMUNICATIONS SYSTEMS - A wireless user equipment (UE) may receive a downlink transmission from a base station in a first subframe of a first subframe configuration, and determine that a neighboring base station is operating according to a second subframe configuration. The UE may modify interference operations for the downlink transmission in the first subframe based on the determination to account for the neighboring base station operating according to the different subframe configuration. Modifying interference operations may include, for example, skipping interference operations, applying different interference operations to a subframe or a portion of a subframe, or a combination thereof. Modifying interference operations may be based on one or more characteristics of the neighboring base station communications. | 10-09-2014 |
20140301252 | METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting channel information by a User Equipment (UE) when an uplink sub-frame is used for downlink transmission in a communication system using a dynamic Time Division Duplex (TDD) UpLink-DownLink (UL-DL) configuration is provided. The method includes receiving reconfiguration information for reconfiguration of TDD uplink and downlink from an evolved Node B (eNB), measuring interference in a first sub-frame changed from an uplink sub-frame to a downlink sub-frame by the reconfiguration, and transmitting information on interference measured in only the first sub-frame to the eNB in an uplink sub-frame according to a predetermined timing. | 10-09-2014 |
20140301253 | DEM CIRCUIT, DELTA-SIGMA MODULATOR, D/A CONVERTER, AND WIRELESS COMMUNICATION DEVICE - DEM circuit ( | 10-09-2014 |
20140301254 | MOBILE COMMUNICATION SYSTEM, BASE STATION, AND USER TERMINAL - A mobile communication system that employs a frequency division duplex scheme, comprises: one or a plurality of UEs ( | 10-09-2014 |
20140307591 | SELECTING AN UPLINK-DOWNLINK CONFIGURATION FOR A CLUSTER OF CELLS - Information associated with a communication condition of at least one cell in a cluster of cells is received, where the communication condition is at least one selected from among a traffic pattern and interference. In response to the received information, a coordinating network node selects an uplink-downlink configuration for use by the cells in the cluster. | 10-16-2014 |
20140307592 | SPLIT BAND FILTERING WITH TWO SAW FILTERS AND SINGLE TUNABLE FILTER - The disclosure includes communication circuitry with a tunable filter configured to tunably filter in a split band. In a first embodiment, communication circuitry includes a tunable filter and a first additional filter. The communication circuitry is configured to communicate within a low target band and within a high target band, wherein an exclusion band is located between the low target band and the high target band. The tunable filter is configured to filter within a low tunable band when tuned within the low tunable band, and configured to filter within a high tunable band when tuned within the high tunable band. The first additional filter is configured to filter in a first additional filter band located in an upper edge of the low target band. | 10-16-2014 |
20140307593 | METHOD AND DEVICE FOR DATA TRANSMISSION - Disclosed are a method and device for data transmission, for improving a data transmission processing solution when a plurality of aggregated cells of user equipment have different TDD UL/DL configurations. The method includes: when the time division duplex up/downlink configurations of a plurality of aggregated cells of user equipment (UE) and only bidirectional data transmission is allowed in an up/downlink collision subframe, the UE determining the allowed data transmission direction of the up/downlink collision subframe, wherein in the time division duplex up/downlink configurations of the plurality of aggregated cells of UE, the data transmission directions of the same up/downlink collision subframe are different; the UE respectively determining available subframes for use in the uplink data transmission direction and available subframes for use in the downlink data transmission direction in each aggregated cell thereof, wherein in the available subframes counted in a data transmission direction opposite to the allowed data transmission direction, the up/downlink collision subframe is not included therein; and the UE performing data transmission in the available subframes. | 10-16-2014 |
20140313946 | Non-Linear Interference Cancellation For Wireless Transceivers - Non-linear interference cancellation techniques are provided for wireless transceivers. Non-linear reduction of interference of a transmit signal on a received signal in a transceiver device, comprises applying the transmit signal to a first non-linear system; applying the received signal to a second non-linear system; and subtracting an output of the first non-linear system output from an output of second non-linear system output to produce an interference mitigated received signal. The first non-linear system and/or the second non-linear system can be to implemented using one or more of a Volterra series and a Generalized Memory Polynomial Model. System parameters of the first non-linear system and/or the second non-linear system are adapted to reduce a power of the interference mitigated received signal. | 10-23-2014 |
20140313947 | WIRELESS COMMUNICATION UNIT, RADIO FREQUENCY MODULE AND METHOD THEREFOR - A wireless communication unit includes at least one antenna port; a transmitter and a receiver operably coupled to the at least one antenna port via a duplexer; wherein the duplexer includes a dynamically reconfigurable phase shift network that includes: at least one tunable radio frequency (RF) component; and at least one switch operably coupled to the tunable RF component and controllable to reconfigure the dynamically reconfigurable phase shift network to selectively support both normal and reverse duplexer modes of operation for RF signals passing there through. | 10-23-2014 |
20140321336 | Method and Apparatus for Access Point Communications - A method, apparatus and computer program product are provided according to some example embodiments to enable the exchange of inter cell messages among neighboring access points. In this regard, a method is provided that includes receiving a request for transmission of an inter cell (IC) message that is to be transmitted to a neighboring access point. The request for transmission further comprises scheduling information from the access point. The method further includes receiving an indication of scheduling priority from the neighboring access point. The method further includes receiving an uplink (UL) grant for the neighboring access point in response to a scheduling request (SR) transmitted to the neighboring access point. The method further includes causing the IC message to be (SR) transmitted to the neighboring transmitted to the neighboring access point. | 10-30-2014 |
20140328220 | CARRIER AGGREGATION ARRANGEMENTS FOR MOBILE DEVICES - Front end circuitry for a wireless communication system includes a first antenna node, a second antenna node, a first triplexer, a second triplexer, and front end switching circuitry coupled between the first triplexer, the second triplexer, the first antenna node, and the second antenna node. The front end switching circuitry is configured to selectively couple the first triplexer to one of the first antenna node and the second antenna node and couple the second triplexer to a different one of the first antenna node and the second antenna node. By using a first triplexer and a second triplexer in the mobile front end circuitry, the mobile front end circuitry may operate in one or more carrier aggregation configurations while reducing the maximum load presented to the first antenna node and the second antenna node, thereby improving the performance of the front end circuitry. | 11-06-2014 |
20140328221 | METHOD AND SYSTEM FOR USING SELECTED BEARER CHANNELS - Using bearer channels for wireless nodes includes initiating communication among the wireless nodes that include a node and one or more neighbor nodes. An adaptive channel operable to communicate messages between the node and the neighbor nodes is established. One or more bearer channels are selected. The one or more neighbor nodes are notified of the one or more selected bearer channels using the adaptive channel. The node and the neighbor nodes communicate over the bearer channels. | 11-06-2014 |
20140328222 | INTERFERENCE CANCELLATION METHOD AND APPARATUS, FILTER DEVICE - An interference cancellation method and apparatus and also a filter are disclosed to cancel the interfering signals leaked to the receiving channel, and enable the receiving channel to suppress the transmitted signal. The method includes: dividing a transmitted signal into a first transmitted signal and a second transmitted signal, and then inputting the first transmitted signal into a first transmitting filter and inputting the second transmitted signal into a second transmitting filter symmetric to the first transmitting filter; adjusting the first interfering signal and the second interfering signal to make opposite phases of the signals; and combining the signals of opposite phases. The method provided herein can cancel the interfering signals leaked to the receiving channel, the receiving channel suppresses the transmitted signal effectively, and the interference caused by the transmitted signal onto the received signal is cancelled. | 11-06-2014 |
20140328223 | SEMICONDUCTOR DEVICE AND HIGH-FREQUENCY MODULE - Reduction of intermodulation distortion in a high-frequency switch is achieved. A semiconductor device ( | 11-06-2014 |
20140334347 | Method of Handling Interference Mitigation and Related Communication Device - A method of handling interference mitigation for a first cell in a first cell cluster of a time-division duplexing (TDD) system comprises determining an interference mitigation for a communication operation between the first cell and a communication device in the TDD system, to reduce an interference caused by the communication operation to a second cell in a second cell cluster of the TDD system; and performing the communication operation according to the interference mitigation. | 11-13-2014 |
20140334348 | FILTER CIRCUIT, INTEGRATED CIRCUIT, COMMUNICATION MODULE, AND COMMUNICATION APPARATUS - There is provided a filter circuit including one or more first capacitors which accumulate and emit a charge at a predetermined timing, one or more first amplifiers which are provided from an input terminal side to the one or more first capacitors and output a current proportional to an input voltage into the input terminal, and one or more second amplifiers which are provided from an output terminal side to the one or more first capacitors and output a current proportional to an output voltage from the output terminal. A proportionality coefficient of each of the one or more first amplifiers and each of the one or more second amplifiers is arbitrarily set. | 11-13-2014 |
20140334349 | METHOD AND TRANSCEIVER FOR CANCELLING MULTI-CARRIER TRANSMISSION INTERFERENCE - A method, an apparatus, and a transceiver for cancelling multi-carrier transmission interference are provided. The method includes: collecting a high order intermodulation signal in radio frequency signals output by a transmitter; processing the high order intermodulation signal so as to generate a first digital signal; establishing a high order intermodulation model by using the first digital signal and a first baseband signal output by the transmitter; generating a second digital signal by using a coefficient of the high order intermodulation model and a second baseband signal output by the transmitter; and counteracting interference in a digital signal output by a receiver with the second digital signal. By using the present invention, high order intermodulation interference of a multi-carrier transmitter on a receiver can be effectively canceled, and therefore, difficulty in duplexer design and requirements on a suppression degree are reduced. | 11-13-2014 |
20140341089 | Interference measurement method and apparatus for controlling inter-cell interference in wireless communication system - The present disclosure relates to an interference measurement method and apparatus for controlling inter-cell interference in a Time Division Duplex (TDD) radio communication system and, in particular, to a technology for a base station to configure a radio frame capable of controlling interference with adjacent base stations and to measure interference based on the radio frame configured as such. In an embodiment of the present disclosure, the first base station sends the second base station the first radio frame configuration information and the second radio frame configuration information including a subset of uplink subframes of the first radio frame configuration. The second base station configures the intersection of uplink subframes of the first and second radio frame configurations into the first interference measurement subframe set and difference of the sets of the subframes of the respective first and second radio frame configurations into the second interference measurement subframe set. The second base station measures uplink interference signals of the neighbor cell during the first interference measurement subframe set and the downlink interference signal of the neighbor cell during the second interference measurement set and transmits the measurement result to the first base station. Through this method, the base station is capable of predicting uplink coverage of the neighbor cell during the first interference measurement subframe set and the downlink coverage of the neighbor cell during the second interference measurement subframe set for controlling inter-cell interference. | 11-20-2014 |
20140341090 | FILTER CIRCUIT AND MODULE - A filter circuit includes: a first transmission filter connected between a first antenna terminal and a first transmission terminal; a second transmission filter connected between the first antenna terminal and a second transmission terminal; a first reception filter connected between a second antenna terminal and a first reception terminal, the second antenna terminal being connected to an antenna different from an antenna to which the first antenna terminal is connected; and a second reception filter connected between the second antenna terminal and a second reception terminal. | 11-20-2014 |
20140348034 | SYSTEMS AND METHODS FOR GROUP COMMUNICATION IN NOISY ENVIRONMENTS - A method, a system, and a network include combining communications from a plurality of subscribers providing a full-duplex communication channel therebetween; detecting noise on the full-duplex communication channel above a predetermined threshold; and selectively enabling a special half-duplex mode on one or more of the plurality of subscribers responsive to the noise, wherein the special half-duplex mode comprises a push-to-talk mode whereby a subscriber has to enable communications via push-to-talk while communicating on the full-duplex communication channel. The method, system, and network define a special half-duplex mode whereby participants are allowed to communicate via push-to-talk, but have their associated lines suppressed to remove noise from the full-duplex communication channel. | 11-27-2014 |
20140348035 | Half-Duplex Phased Array Antenna System - In an exemplary embodiment, a phased array antenna comprises a bidirectional antenna polarizer and is configured for bidirectional operation. The bidirectional antenna polarizer may combine active implementations of power splitters, power combiners, and phase shifters. Furthermore, in another exemplary embodiment a bidirectional antenna polarizer has extensive system flexibility and field reconfigurability. In yet another exemplary embodiment, the bidirectional phased array antenna operates in “radar-like” applications where the transmit and receive functions operate in half-duplex fashion. Furthermore, in exemplary embodiments, the phased array antenna is configured to operate over multiple frequency bands and/or multiple polarizations. | 11-27-2014 |
20140355492 | METHOD AND APPARATUS FOR MONITORING PERFORMANCE, AND REMOTE RADIO UNIT - The present application discloses a method for monitoring performance in a telecommunication system. The method comprises receiving transmitter observation receiver data from a transmission link; down-converting the transmitter observation receiver data to time-divisionally acquire a signal band, a high adjacent band and a low adjacent band of the transmitter observation receiver data; and calculating adjacent channel leakage ratio from power of the signal band, the high adjacent band and the low adjacent band of the transmitter observation receiver data. The present application also discloses an apparatus for monitoring performance and a remote radio unit including the same. | 12-04-2014 |
20140376418 | ENHANCED MODULATOR AND DEMODULATOR - Embodiments of this invention describe a method to reduce the effective inter carrier spacing between the sub-carriers of wireless, wired or optical transmissions and thereby increase the spectral efficiency of the communication system. Signal transmitted from multiple transmit chains are shifted in frequency at the transmitter. At the receiver a plurality of receive chains is used, the received signals are similarly shifted in frequency and used to reduce the inter carrier interference. Embodiments also describe a method for Full Duplex communication where the transmitters transmit using different frequency shifts. The receiver receives the transmitted signal and an echo of it's transmission. As the received transmission is shifted in frequency from it's transmission, it can cancel out the echo and receive the intended signal. | 12-25-2014 |
20140376419 | PASSIVE LEAKAGE CANCELLATION NETWORKS FOR DUPLEXERS AND COEXISTING WIRELESS COMMUNICATION SYSTEMS - A passive cancellation network may include a transmit input having a configuration that passively receives a transmit signal from a transmitter that is to be wirelessly transmitted; a transmit output having a configuration that passively delivers the transmit signal after processing by the passive cancellation network; a receive input having a configuration that passively receives a receive signal that includes undesirable leakage from the transmit signal; a receive output having a configuration that passively delivers the receive signal after processing by the passive cancellation network; and a passive feed forward cancellation circuit that passively cancels at least a portion of the undesired leakage from the transmit signal in the receive signal in a feed forward manner. | 12-25-2014 |
20140376420 | COMMUNICATIONS APPARATUS USING TRAINING SIGNAL INJECTED TO TRANSMISSION PATH FOR TRANSMISSION NOISE SUPPRESSION/CANCELLATION AND RELATED METHOD THEREOF - A communications apparatus has a transmitter path and a training signal generator. The transmitter path is arranged for transmitting a transmission signal. The training signal generator is arranged for generating a training signal in a receiver band, and injecting the training signal to the transmitter path. The training signal is utilized to obtain an accurate estimation of the channel which helps to suppress transmission noise comprised in at least one received signal of the communications apparatus, and the transmission noise is generated by the transmitter path. Specifically, the communications apparatus further has a receiver path and a transmission noise suppression device. The receiver path is arranged for receiving a received signal. The transmission noise suppression device is arranged for receiving the training signal, and processing the received signal to suppress transmission noise comprised in the received signal according to at least the training signal. | 12-25-2014 |
20150009866 | Cancellation of Spurious Responses From Local Oscillator Cross-Coupling - Interference cancellation techniques may be implemented in a radio transceiver configured to transmit a radio-frequency transmit signal at a transmit frequency and having two or more local oscillators operative to simultaneously generate local oscillator signals, at corresponding local oscillator frequencies, for simultaneously down-converting two or more corresponding received radio-frequency signals. An example method begins with identifying one or more self-interfering frequencies, based on the local oscillator frequencies and the transmit frequency. A baseband cancellation signal is then generated by weighting and frequency-shifting a baseband representation of the transmit signal, based on the identified self-interfering frequencies. The baseband cancellation signal is then combined with a down-converted received signal, to obtain an interference-reduced baseband signal. | 01-08-2015 |
20150009867 | SIMULTANEOUS TRANSMIT AND RECEIVE (STR) STRUCTURES IMMUNE TO PHASE AND AMPLITUDE IMBALANCES - An echo-canceling unit for a simultaneous transmit and receive (STR) system includes at least three phase shifters in which each respective phase shifter is coupled to a transmit signal to generate an output signal comprising a selected phase shift with respect to the transmit signal. A weight calculation unit generates a corresponding amplitude-weight signal for the output signal of the phase shifter. A variable attenuator attenuates the output signal of each respective phase shifter based on the corresponding amplitude-weight signal to form an echo-cancelation signal component corresponding to the phase shifter. A first summer then sums the respective echo-cancelation signal components into a received signal containing an echo signal to form an echo-canceled signal. | 01-08-2015 |
20150009868 | SYSTEM AND METHOD FOR FULL DUPLEX CANCELLATION - Disclosed herein are systems, methods, and computer-readable storage media for enabling improved cancellation of self-interference in full-duplex communications, or the transmitting and receiving of communications in a single frequency band without requiring time, frequency, or code divisions. The system estimates the signal strength and phase of a self-interference signal, generates a cancellation signal based on this estimate, then uses the cancellation signal to suppress the self-interference before sampling received analog signal. After applying the cancellation signal, the system samples and digitizes the remaining analog signal. The digitized signal is then subjected to additional digital cancellation, allowing for extraction of the desired signal. | 01-08-2015 |
20150009869 | Dual Band LTE Small Cell - A dual band LTE small cell base station communicates on both licensed bands and unlicensed bands. The small cell base station modifies the communication protocol utilized by the licensed band to enable communication over an unlicensed band. This modification involves replacing the physical (PHY) layer of the licensed band communication protocol with the PHY layer of a to-be-used protocol in an unlicensed band. | 01-08-2015 |
20150029906 | SYSTEM AND METHOD FOR REDUCING INTER-CELLSITE INTERFERENCE IN FULL-DUPLEX COMMUNICATIONS - Disclosed herein are systems, methods, and computer-readable storage devices for reducing inter-cellsite interference during full-duplex communication. A system receives a channel amplitude and a phase estimate between a first station and a second station, the first station and the second station creating inter-cellsite interference on a channel during full-duplex communications. The system calculates a level of the inter-cellsite interference between the first station and the second station based on the channel amplitude and the phase estimate and generates a cancellation signal based on the inter-cellsite interference. The system then communicates the cancellation signal to the first station for transmission with additional data during additional full-duplex communications. | 01-29-2015 |
20150029907 | METHOD TO OPTIMIZE ALMOST BLANK SUBFRAME USAGE IN A WIRELESS NETWORK - A method to optimize almost blank subframe usage in a wireless network including generating, an interfering base station, in order to minimize interference caused to a serving base station, an almost blank subframe pattern and sending the latter to the serving base station. The serving base station generating a set of preferred almost blank subframes, from said received almost blank subframe pattern, that their knows will be of use for providing a wireless connectivity to a user terminal, and sending the preferred almost blank subframes ordered by a priority of usage to said interfering base station. And the interfering base station, using, in the case of requiring the use of additional subframes for serving its own user terminals, the almost blank subframes indicated as low priority in said received set of preferred almost blank subframes from the serving base station. | 01-29-2015 |
20150029908 | Resource Management with Device-Device Communication in Next Generation Cellular Networks - At the beginning of every epoch the invention estimates the average traffic demand from cellular and device-to-device traffic in each sector in either DL or UL directions based on history from previous epochs. It partitions the network into interfering sectors and employing device-to-device traffic to determine the dynamic fractional frequency reuse FFR patterns for each of these clusters. Then, in every frame, for the set of sectors co-located at the same base station and instantaneous traffic demands, the invention solves the problem of device-to-device traffic placement and scheduling of cellular and device-to-device traffic jointly. | 01-29-2015 |
20150036557 | TIME DIVISION DUPLEX ADAPTIVE FRAME STRUCTURE RETRANSMISSION METHOD, NETWORK AND TERMINAL SIDE DEVICE - A technology of dynamically allocating uplink and downlink subframes in an LTE-advanced Time Division Duplex (TDD) communication system specifically relates to a TDD adaptive frame structure retransmission method, network and terminal side device. The method includes: in a TDD adaptive frame transmission process, for an uplink subframe, if a frame structure whose Round Trip Time (RTT) period of a Physical Hybrid-ARQ Indicator Channel (PHICH) and a Physical Uplink Shared Channel (PUSCH) corresponding to the uplink subframe is 10 ms is found in seven already defined frame structures, transmitting PHICH data on a corresponding downlink subframe in the found frame structure, and receiving retransmitted data on the corresponding uplink subframe in the found frame structure. The technical solution of the present application ensures the Hybrid Automatic Repeat Request (HARQ) compatibility with an uplink data channel of an R10UE. | 02-05-2015 |
20150043389 | METHOD AND APPARATUS FOR SIGNALING TO A MOBILE DEVICE WHICH SET OF TRAINING SEQUENCE CODES TO USE FOR A COMMUNICATION LINK - The present patent application improves DARP by allowing multiple users on one time slot (MUROS). It comprises means and instructions for signaling training sequence set information to a remote station, comprising receiving signaling from a remote station indicating if a new set of training sequences is supported, and using a channel description to signal the training sequence set to be used by the remote station for a communication channel being established. | 02-12-2015 |
20150049650 | SIMULTANEOUS TRANSMIT AND RECEIVE - A simultaneous transmit and receive technology is described. A downlink transmission and an uplink receive beam are formed at a base station (BS) having a beam pattern with predetermined nulls. The predetermined nulls are formed over predetermined elevation angles to reduce interference with a proximate BS. Transmission and reception occur simultaneously using the beam pattern from the BS. | 02-19-2015 |
20150049651 | DYNAMICALLY UPDATING FILTERING CONFIGURATION IN MODEM BASEBAND PROCESSING - Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to dynamically updating filtering configuration in modem baseband processing. A method is provided for wireless communications. The method may be performed, for example, by a user equipment (UE). The method generally includes detecting one or more conditions regarding one or more metrics of a received signal and updating, based on the detection, a configuration of one or more filters designed to mitigate an effect of spurious signals associated with (e.g., that fall within) a bandwidth of the received signal. | 02-19-2015 |
20150055514 | DUAL-LOOP TRANSMIT NOISE CANCELLATION - A transmitter circuit is described. The transmitter circuit includes a first local oscillator that generates a first frequency equal to a duplex frequency. The transmitter circuit also includes a second local oscillator that generates a second frequency equal to a receive frequency. The transmitter circuit further includes a first mixer that combines the first frequency with a first input signal. The transmitter circuit also includes a first feedback loop. The first feedback loop includes a second mixer that combines the second frequency with a transmit signal and a first filter and a first adder that combines an output of the first mixer with an output of the first filter. The transmitter circuit also includes a third local oscillator that generates a third frequency equal to the receive frequency. The transmitter circuit further includes a third mixer that combines the third frequency with an output of the first adder. | 02-26-2015 |
20150055515 | METHOD AND APPARATUS FOR HANDLING FULL-DUPLEX INTERFERENCE - The present invention provides a method and an apparatus for handling full-duplex interference. One method includes: obtaining an interference degree that is caused when a site device performs full-duplex transmission with at least two UEs; and determining, according to the interference degree, a UE allowed to transmit uplink and downlink signals on the same time and frequency resource among the at least two UEs. In embodiments of the present invention, a UE allowed to transmit uplink and downlink signals on the same time and frequency resource may be classified according to an interference degree that is caused when a site device performs full-duplex transmission with at least two UEs, thereby preventing the interference problem in the scenario of point-to-multipoint full-duplex communication as much as possible. | 02-26-2015 |
20150063175 | WIRELESS COMMUNICATION APPARATUS - According to an embodiment, a wireless communication apparatus includes a clock transmitting unit, a function circuit and a control unit. The clock transmitting unit is configured to transmit a clock signal through one of a plurality of transmission paths. The transmission paths are different from each other. The function circuit is configured to operate in synchronization with the clock signal transmitted by the clock transmitting unit. The control unit is configured to select one of the plurality of transmission paths according to an operation state of the wireless communication apparatus. | 03-05-2015 |
20150071133 | METHOD AND NODE FOR LISTENING - Embodiments of the present invention disclose a method and a node for listening. The method includes: receiving a listening reference signal in a listening pilot time slot; analyzing the listening reference signal received to obtain interference information of a node sending the listening reference signal and/or a resource configuration of a node sending the listening reference signal. By adopting the present invention, the node in the embodiments of the present invention receives the listening reference signal in the listening pilot time slot, and analyzes the received listening reference signal to obtain the interference information of a node sending the listening reference signal and/or the resource configuration of the node sending the listening reference signal, so as to listen to an interference condition and/or a resource configuration of an adjacent node. | 03-12-2015 |
20150078216 | SET UP AND MAINTENANCE FRAMEWORK FOR FLEXIBLE TIME DIVISION DUPLEX OPERATION IN HETEROGENEOUS NETWORK - One embodiment is directed to a method for operating base stations in a heterogeneous network. The method may include receiving, by a first base station, an indication for a second base station to use flexible time division duplex mode ( | 03-19-2015 |
20150078217 | SYSTEMS FOR DELAY-MATCHED ANALOG SELF-INTERFERENCE CANCELLATION - A system for delay-matched analog self-interference cancellation including a transmit coupler, that samples the analog transmit signal to create a sampled analog transmit signal; a delay matcher that imposes a variable delay on the sampled analog transmit signal to create a delayed analog transmit signal; an analog self-interference canceller that transforms the delayed analog transmit signal to an analog self-interference cancellation signal; and a receive coupler, that combines the analog self-interference cancellation signal with the analog receive signal. | 03-19-2015 |
20150078218 | PROVIDING DIFFERENT TRANSMIT AND/OR RECEIVE MODES IN DIFFERENT SECTORS OF A WIRELESS BASE STATION - A wireless base station simultaneously transmits or receives wireless communications in different modes in different sectors of the wireless base station. The different modes may comprise a Time Division Duplex (TDD) mode and a non-TDD mode, and/or different air interfaces. Related methods and systems are described. | 03-19-2015 |
20150078219 | DEVICE AND METHOD FOR TRANSMITTING RANDOM ACCESS PREAMBLE - Base Station (BS) and User Equipment (UE) apparatuses for configuring a Random Access CHannel (RACH), and methods thereof, are provided. The method for a BS to configure a RACH includes generating configuration information on RACH resources, transmitting the configuration information on the RACH resources to a UE, receiving a random access preamble multiplexed on a plurality of continuous RACH resources from the UE, extracting the random access preamble multiplexed on the plurality of continuous RACH resources, and detecting the extracted random access preamble. The method for a UE to configure a RACH includes receiving configuration information on RACH resources from a BS, selecting occupied RACH resources among a plurality of continuous RACH resources, generating a random access preamble, multiplexing the generated random access preamble on the selected RACH resources, and transmitting the random access preamble on the selected RACH resources to the BS. | 03-19-2015 |
20150085709 | Integrated On-Chip Duplexer for Simultaneous Wireless Transmission - An electrical balancing network combined with coupled inductors (EBN) replaces a transmit/receive switch was used for isolation for time division duplexing transmission techniques. The EBN allows simultaneous transmit operation, or simultaneous receive operation, of multiple wireless technologies that would otherwise have to be scheduled for transmit or receive in a time division multiplexing manner. The wireless technologies may be WLAN, LTE, Bluetooth or other wireless technologies. | 03-26-2015 |
20150085710 | WIRELESS TRANSCEIVER WITH CIRCULATOR-BASED QUADRATURE DUPLEXER AND METHODS FOR USE THEREWITH - A wireless transceiver includes a transmit path configured to generate a radio frequency (RF) transmit signal for transmission via an antenna. A receive path is configured to receive an RF receive signal via the antenna. A circulator-based quadrature duplexer includes an in-phase circulator and a quadrature-phase circulator configured to couple the transmit signal from the transmit path to the antenna while generating a residual transmit signal on the receive path, and to couple the receive signal from the antenna to the receive path. The circulator-based quadrature duplexer promotes cancellation of the residual transmit signal on the receive path. | 03-26-2015 |
20150092620 | Method And Apparatus For Improved Multicast Service Using Negotiated Feedback - Various methods and devices are provided to address the need for improved multicast operation. In one method, a feedback mobile device receives ( | 04-02-2015 |
20150092621 | Full Duplex System in Massive MIMO - A multiple input multiple output (MIMO) antenna system is implemented for communications in a wireless device. MIMO beamforming techniques are utilized to improve communications, and may be utilized in full-duplex mode. Techniques include the formation of beamforming patterns having orthogonal polarizations to one another at each communication device, but having matching polarization between transmit/receive pairs located at each respective communication device. Techniques also include the formation of beamforming patterns in a direction towards another communication device to maximize transmit power in that direction while inducing nulls in the beamforming pattern to reduce self-interference coupling via antennas configured for reception. Full-duplex communications are improved through monitoring of the self-interference coupling and adapting the beamforming patterns to reduce it. Beamforming vectors may be generated by solving a cost function that may include an additional constraint of reduction of self-interference coupling. | 04-02-2015 |
20150092622 | Diplexer Elimination in Microwave Point-to-Point FDD Systems - A circulator based transceiver sharing a common antenna between a receive signal path and a transmit signal path is disclosed. Techniques to reduce coupled transmit signals and coupled transmit noise in a receive signal path, implemented in a variety of embodiments is disclosed allowing elimination of a diplexer, simplification of circulator design and reduction of transceiver cost. The transceiver includes means to generate and couple a correction signal into the receive signal path to attenuate coupled transmit signal in the receive path. Furthermore, the transceiver includes echo cancellation techniques to attenuate transmit noise in the receive signal path. Methods to utilize the transceiver to attenuate coupled transmit signal and transmit noise may improve transceiver efficiency, for example, in demodulation techniques and processing of data signal. | 04-02-2015 |
20150092623 | ANTENNA MODULE AND A METHOD FOR WIRELESS COMMUNICATION - An antenna module for wireless communication comprises an antenna element, a first port and a second port. The antenna element comprises a first resonance frequency and a second resonance frequency. The first port is configured to receive or provide a first radio frequency signal with a first frequency range and the second port is configured to receive or provide a second radio frequency signal with a second frequency range. The first frequency range is different from the second frequency range. Further, the first resonance frequency is located in the first frequency range and the second resonance frequency is located in the second frequency range. The antenna element is configured to transmit or receive the first radio frequency signal and the second radio frequency signal simultaneously. | 04-02-2015 |
20150092624 | PUCCH Resource Allocation and Use - A base station determines a first set of PUCCH resources to use for a first set of UEs to send acknowledgment information to the base station for a first group of DL subframes. The first set of PUCCH resources starts at a first index. The base station determines a second set of PUCCH resources to use for a second set of UEs to send acknowledgment information to the base station for a second group of DL subframes. The second set of PUCCH resources starts at a second index. The UEs in the first set only use the first set of PUCCH resources. The UEs in the second set use the first and second sets of PUCCH resources. For an UL reception, acknowledgement information is received from the first UEs using the first set of PUCCH resources and from the second UEs using the first and second sets of PUCCH resources. | 04-02-2015 |
20150092625 | HYBRID ACTIVE AND PASSIVE TUNABLE RF FILTERS - RF communications circuitry includes a first RF filter structure, which is disclosed. The first RF filter structure includes a first passive group of RF resonators and active loss-reduction circuitry. The active loss-reduction circuitry is coupled to the first passive group of RF resonators. The active loss-reduction circuitry uses self-limiting positive feedback to reduce signal loss in the first passive group of RF resonators. Additionally, the active loss-reduction circuitry limits the self-limiting positive feedback to prevent self-oscillation in the active loss-reduction circuitry. | 04-02-2015 |
20150098366 | Method of Handling Uplink/Downlink Configurations for Time-Division Duplexing System and Related Communication Device - A method of handling an unlink/downlink (UL/DL) configuration for a communication device includes receiving a first UL/DL configuration in first system information from a first cell in an idle mode; applying the first UL/DL configuration; receiving a second UL/DL configuration on a physical DL control channel from the first cell in a connected mode; applying the second UL/DL configuration; receiving a third UL/DL configuration in second system information from the first cell in the connected mode; and applying the third UL/DL configuration. | 04-09-2015 |
20150098367 | METHOD AND APPARATUS OF CONTROLLING FOR UPLINK SCHEDULING AND HARQ TIMING - The present invention relates to an apparatus and method for controlling an uplink (UL) scheduling and Hybrid Automatic Repeat reQuest (HARD) timing supported in a TDD-FDD CA environment. According to aspects of the present invention, in a TDD-FDD carrier aggregation deployment environment, an efficient UL scheduling/HARQ operation may be performed for a UE in which a cross-carrier scheduling is configured. | 04-09-2015 |
20150109969 | FULL DUPLEX COMMUNICATION IN THE PRESENCE OF MIXED FULL AND HALF DUPLEX USERS - A method, an apparatus, and a computer program product for providing full duplex (FD) wireless communication to an FD capable (FDC) user equipment (UE) among one or more UEs include determining allocations of one or more resource blocks (RBs) to the one or more UEs, determining FD capabilities and scheduling parameters of the one or more UEs, determining at least one FD portion and at least one half duplex (HD) portion in the one or more RBs based on the FD capabilities and the scheduling parameters of the one or more UEs, wherein a concurrent downlink (DL) and uplink (UL) communication is scheduled in the at least one FD portion, and adjusting the allocations of the one or more RBs based on the at least one FD portion and the at least one HD portion. | 04-23-2015 |
20150109970 | METHOD AND APPARATUS FOR MANAGING PROCESSING IN TDD FRAMES TO ENABLE POWER DISSIPATION REDUCTION - The present invention relates to methods and apparatuses for managing the time slots in time division duplex (TDD) frames in an xDSL system. According to certain aspects, power savings in a TDD system operating with vectoring may be achieved with sending of quiet symbols in time slots that do not have data and through the efficient configuration of time slots with data and/or idle symbols so as to limit the amount of processing by the vectoring engine within the DO portion of each TDD frame. In embodiments, a central controller in a DPU monitors the data buffers at the transmitter input on each line and computes an optimal configuration of the time slots in the DO portion of the TDD frame to achieve an optimal balance between performance and power dissipation. | 04-23-2015 |
20150117270 | METHOD AND APPARATUS FOR DETERMINING GUARD PERIOD ON TIME DIVISION DUPLEX SYSTEM - Disclosed are a method and an apparatus for determining a Guard Period (GP) in a Time Division Duplexing (TDD) system. A communication method based on Time Division Duplexing (TDD) includes: determining, by a base station, a guard period based on information on a distance between user equipment and the base station; and performing, by the base station, downlink transmission to the user equipment based on the determined guard period, wherein the guard period is determined based on one of a default guard period mode, a reduced guard period mode, and a zero guard period mode, and the reduced guard period mode is a mode for setting a reduced guard period, which is shorter than the default guard period set based on the default guard period mode, and the zero guard period mode is a mode for setting a length of the guard period to 0. | 04-30-2015 |
20150124661 | MULTIMODE WIRELESS SYSTEMS AND METHODS - The present disclosure includes systems and methods for operating a wireless communication system in multiple modes. The system is configured in a first mode when a transmission interference in a receiver of a wireless device is below a first threshold. The system is configured in one or more intermediate modes when the transmission interference is above the first threshold and below a second threshold. The system is configured in a second mode when the transmission interference is above the second threshold. The one or more intermediate modes activate interference management processes and the wireless device transmits data and receives data simultaneously. In some embodiments, transmission interference may be based on an SINR measurement. | 05-07-2015 |
20150124662 | REVERSIBLE RADIO ARCHITECTURE BETWEEN TRANSMISSION AND RECEPTION FUNCTIONS IN A MOBILE COMMUNICATION SYSTEM - Disclosed is a reversible Time Division Duplex (TDD) and/or Time Division Multiple Access (TDMA) radio architecture between Transmission (Tx) and Reception (Rx) functions in a mobile communication system. Accordingly, all of the blocks/components in a Tx/Rx Radio Frequency unit are reversible between Tx and Rx functions. As such, the blocks/components are adapted to bi-directionally process a signal, either in a Tx or Rx direction, based on switching. | 05-07-2015 |
20150124663 | METHOD AND APPARATUS FOR CONFIGURATON, MEASUREMENT AND REPORTING OF CHANNEL STATE INFORMATION FOR LTE TDD WITH DYNAMIC UL/DL CONFIGURATION - A method of operating a time division duplex (TDD) wireless communication system is disclosed. The method includes establishing communications with a remote transceiver. A subframe configuration including static and flexible subframes is determined and transmitted to the remote transceiver. A channel state information (CSI) report is received from the remote transceiver in response to the subframe configuration. | 05-07-2015 |
20150131490 | Bidirectional Voice Transmission System and Method Thereof - The present invention relates to a bidirectional voice transmission system and a method thereof, wherein the system timing of the system is divided into three time slots for carrying a control signal, a broadcast voice signal and a mobile device voice signal. The bidirectional voice transmission system is able to carry out the signal transmission by way of frequency frogging, so as to effectively avoid the signal interference from occurring between any two different signal transmitting and receiving devices. Besides, all of the mobile devices can be added into the bidirectional voice transmission system by way of dynamic building, without using any specific communication interface. The most important is that, the number of node routers can be expanded to about 65,000 in order to apply the bidirectional voice transmission system in a huge range network communication or a wild rescue field. | 05-14-2015 |
20150131491 | Tracking - The present invention relates to methods, apparatuses and computer program products for use in bi-directional channel tracking. The invention includes allocating, at a first network entity, a sub-carrier in a frequency domain for transmitting a tone to a second network entity, prohibiting, at the first network entity, receiving signals on the sub-carrier allocated for transmitting the tone, estimating, at the first network entity, a channel of residual self-interference based on the transmitted tone. | 05-14-2015 |
20150131492 | ADAPTIVE FILTER RESPONSE SYSTEMS AND METHODS - The present subject matter relates to systems, devices, and methods for adaptively tuning antenna elements and/or associated filter elements to support multiple frequency bands. For example, a tunable filter having an input node and an output node can be selectively tunable to define one or more pass bands associated with one or more first signal bands and one or more reject bands associated with one or more second signal bands. The tunable filter can be configured to pass signals having frequencies within the first signal bands between the input node and the output node and to block signals having frequencies within the second signal bands. Furthermore, the tunable filter can be configured to selectively tune the pass bands to have a minimum pass band insertion loss at any of a variety of frequencies, including frequencies that are greater than and less than frequencies within the reject bands. | 05-14-2015 |
20150131493 | Adjacent Channel Interference Cancellation in Multi-Channel Systems - A method for adjacent channel interference cancellation may be disclosed, comprising collecting adjacent channel usage samples at a first time; assigning coefficient weights in an adjacent channel interference model based on the adjacent channel usage samples; determining whether a radio may be available for measuring current adjacent channel usage; adjusting coefficient weights based on the current adjacent channel usage; and canceling noise in an adjacent channel at a second time based on the coefficient weights. A radio frequency chain may be coupled to the output of the radio transceiver and configured to sample adjacent channel interference caused by the radio transceiver. | 05-14-2015 |
20150139046 | TRANSMITTER AND RECEIVER CALIBRATION FOR OBTAINING THE CHANNEL RECIPROCITY FOR TIME DIVISION DUPLEX MIMO SYSTEMS - A communication device operating in time division duplex (TDD) mode using multiple antennas is provided herein. The communication device uses receive channel estimation measurements to perform transmit beamforming and multiple input multiple output (MIMO) transmission, based on self-calibration of the various up/down paths via a method of transmission and reception between its own antennas, thus achieving reciprocity mapping between up and down links. Either user equipment (UE) or a base station may routinely perform this self-calibration to obtain the most current correction factor for the channel reciprocity to reflect the most current operating conditions present during TDD MIMO operation. | 05-21-2015 |
20150139047 | RADIO TRANSCEIVER ON A CHIP - An entire radio transceiver can be easily integrated into one IC chip. In order to integrate the IF filters on the chip, a heterodyne architecture with a low IF is used. A single, directly modulated VCO is used for both up-conversion during transmission, and down-conversion during reception. Bond-wires are used as resonators in the oscillator tank for the VCO. A TDD scheme is used in the air interface to eliminate cross-talk or leakage. A Gaussian-shaped binary FSK modulation scheme is used to provide a number of other implementation advantages. | 05-21-2015 |
20150146582 | SYSTEM FOR ENABLING DUPLEX COMMUNICATION ON PORTABLE RADIOS - A portable radio communication system for enabling duplex communication on portable radios is provided. The portable radio communication system comprises a host radio having a host radio antenna and an accessory having an accessory antenna. The host radio antenna is operated to receive signals simultaneously on at least two channels during a dual watch mode of operation or receive signals on a single channel during a single watch mode of operation. The portable radio communication system further comprises at least one switch coupled to the host radio antenna and the accessory antenna. The switch enables duplex communication during the dual watch mode of operation or single watch mode of operation by routing transmit signals from the host radio to the accessory antenna for transmission while the host radio antenna receives signals during the dual watch mode of operation or single watch mode of operation. | 05-28-2015 |
20150146583 | WIRELESS TRANSCEIVER WITH CIRCULATOR AND ACTIVE CANCELLATION AND METHODS FOR USE THEREWITH - A wireless transceiver includes a transmit path configured to generate a radio frequency (RF) transmit signal for transmission via an antenna, the transmit path generating a feedforward signal having at least one adjustable phase. A receive path is configured to receive an RF receive signal via the antenna. A circulator-based duplexer includes a circulator configured to couple the transmit signal from the transmit path to the antenna and to couple the receive signal from the antenna to the receive path. A controller is configured to process feedback from the receive path and to control the at least one adjustable phase to cancel portions of the transmit signal on the receive path. | 05-28-2015 |
20150146584 | SYSTEM AND METHOD FOR TRANSMIT AND RECEIVE ANTENNA PATTERNS CALIBRATION FOR TIME DIVISION DUPLEX (TDD) SYSTEMS - A method and system for calibrating transmit and receive antenna patterns for time division duplex (TDD) is described. A station in a communications network comprises at least two antennas configured to operate together for both transmitting and receiving modes. A phase setting difference between the transmit and receive antenna patterns may be determined and used to determine a relative amplitude setting for the transmit antenna pattern and/or a relative amplitude setting for the receive antenna pattern. | 05-28-2015 |
20150146585 | APPARATUSES AND METHOD USING ENHANCED CONTROL CHANNEL INFORMATION FOR TDD-FDD CARRIER AGGREGATION - Apparatuses and methods for carrier aggregation are generally described herein. An evolved NodeB (eNB) may transmit downlink control information (DCI) on a control channel portion for a primary cell (PCell) downlink (DL) subframe. The DCI can include an offset field indicating an offset, relative to a first secondary cell (SCell) subframe, to identify a second SCell subframe for which the DCI is providing control information. Other apparatuses and methods are also described. | 05-28-2015 |
20150295699 | METHOD OF CONTROLLING TDD TX/RX SWITCHING TIMING IN CLOUD RADIO ACCESS NETWORK - Provided is a method for controlling a time division duplexing (TDD) Tx/Rx switching timing in a cloud radio access network (CRAN) that can finely control a switching timing between transmission and reception of TDD signals with an additional component added to a digital unit (DU) and a radio unit (RU) in the CRAN. | 10-15-2015 |
20150303981 | TRANSCEIVER FRONT-END - A transceiver front-end for a communication device is connectable to a signal transmission and reception arrangement adapted to transmit a transmit signal having a transmit frequency and to receive a receive signal having a receive frequency. The transceiver front-end is also connectable to a transmitter adapted to produce the transmit signal, and to a receiver adapted to process the receive signal. The transceiver front-end comprises a transmit frequency suppression filter arrangement and a receive frequency suppression filter arrangement. The transmit frequency suppression filter arrangement is adapted to suppress transfer of a signal having the transmit frequency and to pass a signal having the receive frequency. The receive frequency suppression filter arrangement is adapted to suppress transfer of a signal having the receive frequency and to pass a signal having the transmit frequency. The transceiver front-end also comprises a transmit frequency cancellation arrangement and a receive frequency cancellation arrangement. The transmit frequency cancellation arrangement is adapted to produce a first cancellation signal for cancellation, at receiver nodes, of a suppressed signal having the transmit frequency, transferred by the transmit frequency suppression filter arrangement. The receive frequency cancellation arrangement is adapted to produce a second cancellation signal for cancellation, at signal transmission and reception arrangement nodes of a suppressed signal having the receive frequency, transferred by the receive frequency suppression filter arrangement. Corresponding transceiver, communication device and method are also disclosed. | 10-22-2015 |
20150312018 | Radio Frequency Circuit and Mobile Terminal - A radio frequency circuit. In the circuit, a first directional coupler receives a second transmit signal, uses a part of the second transmit signal as a third transmit signal, directly sends the third transmit signal to a first port of a circulator, and obtains a first coupling signal from the second transmit signal; the circulator outputs the third transmit signal through a second port; an impedance tuner transmits the third transmit signal to an antenna port and transmits, to the second port of the circulator, a first input signal from the antenna port; the circulator inputs the first input signal to a second directional coupler through a third port; the second directional coupler obtains a second coupling signal from the first input signal; and a controller adjusts impedance of the impedance tuner according to the first coupling signal and the second coupling signal. | 10-29-2015 |
20150318976 | Full-Duplex Self-Interference Cancellation Systems - Embodiments of full-duplex self-interference cancellation systems are described. In one embodiment, a full-duplex transceiver includes a digital signal processor that processes digital signals, a transmit chain that receives a first digital baseband signal from the digital signal processor and converts it to a first RF signal, a receive chain that receives a second RF signal and converts the second RF signal to a second digital baseband signal, and an auxiliary receive chain that receives a portion of the first RF signal and converts it to an auxiliary digital baseband signal. The transceiver may further include a self-interference canceller that applies a channel transfer function to the auxiliary digital baseband signal to generate a cancellation signal and subtracts the cancellation signal from the second digital baseband signal to cancel self-interference at the transceiver. The suppression of self-interference in the transceiver assists the transceiver to achieve higher efficiency in full-duplex communications. | 11-05-2015 |
20150326377 | METHOD AND APPARATUS FOR COEXISTENCE AMONG WIRELESS TRANSMIT/RECEIVE UNITS (WTRUS) OPERATING IN THE SAME SPECTRUM - A method and apparatus for coexistence among wireless transmit/receive units (WTRUs) operating in the same spectrum are disclosed. A wireless transmit/receive unit (WTRU) may include a processor that receives a configuration of a coexistence gap pattern defining a pattern of transmission periods and silent periods for the WTRU. The processor may control the WTRU to transmit information during the transmission periods and to not transmit information during the silent periods of the coexistence gap pattern. | 11-12-2015 |
20150341096 | ANTENNA CALIBRATION METHOD, SYSTEM AND APPARATUS - An embodiment of the present invention relates to the technical field of wireless communications, in particular to an aerial calibration method, system and device. In the prior art, an air interface calibration method involving a user equipment (UE) requires the UE to feed back a channel coefficient, and a channel coefficient direct quantization method occupies a great deal of uplink overhead and reduces system efficiency. The present invention solves the above problem. The method in the embodiment of the present invention comprises: the UE measures a downlink channel and determines a downlink channel matrix; the UE determines a first weighting matrix for aerial calibration according to the downlink channel matrix; the UE notifies a network side of the determined first weighting matrix. In the embodiment of the present invention, a UE decomposes the characteristic value of the downlink channel matrix, or reports the identifier corresponding to the first weighting matrix to the network side device, thus reducing the occupied uplink overhead and improving system efficiency. | 11-26-2015 |
20150341157 | Full Duplex Reconfigurable Antenna Self-Interference Cancellation Systems - Embodiments of full-duplex systems with reconfigurable antennas are described. In one embodiment, a full-duplex reconfigurable antenna transceiver includes a transmit chain, a receive chain, and a reconfigurable antenna having a plurality of reconfigurable modes. The transceiver may also include an antenna controller configured to set a mode of the reconfigurable antenna. According to other aspects, the transceiver may also include a signal processor configured to transmit a set of training symbols during a training interval. The antenna controller may be further configured to select a respective mode of the reconfigurable antenna for each training symbol in the set of training symbols. Additionally, the antenna controller may be configured to calculate a received Signal-of-Interest to Interferer Ratio (SIR) for each training symbol of the set of training symbols. In this context, a full-duplex system utilizing a reconfigurable antenna may achieve significant rate improvement compared to half-duplex systems. | 11-26-2015 |
20150381333 | NOVEL APPROACH FOR ENABLING MIXED MODE BEHAVIOR USING MICROPHONE PLACEMENT ON RADIO TERMINAL HARDWARE - Method for operating a portable communication device (PCD) ( | 12-31-2015 |
20150381335 | INTERFERENCE CANCELLATION - A method implemented in an access point (AP) used in a wireless communications system including a first uplink (UL) client device, a second UL client device, and a first downlink (DL) client device is disclosed. The method comprises: receiving, from the first DL client device, first composite channel matrix M | 12-31-2015 |
20160020817 | Method and Apparatus for Antenna Calibration - Method and apparatus for antenna calibration have been disclosed. A radio unit ( | 01-21-2016 |
20160020894 | FULL DUPLEX WIRELESS COMMUNICATIONS ON DEVICES WITH LIMITED ECHO CANCELLATION CAPABILITIES - Disclosed in some examples are methods, systems, and machine readable mediums which allow for wireless devices with limited echo cancellation capabilities to participate in full-duplex communications. In some examples, by carefully controlling transmission powers and the modulation and coding schemes (MCS) used in the transmissions, both devices can engage in full-duplex communication. | 01-21-2016 |
20160020895 | BI-DIRECTIONAL FULL-DUPLEX LOCK SYSTEM APPLIED IN DATA TRANSMISSION INTERFACE AND OPERATING METHOD THEREOF - A bi-directional full-duplex lock system applied in a data transmission interface of a liquid crystal display is disclosed. The data transmission interface includes a transmitter and a receiver. The bi-directional full-duplex lock system includes a detection module and a control module. The detection module detects a transmitter link state of transmitter and a receiver link state of receiver respectively. The control module controls transmitter to transmit a lock signal to receiver, controls receiver to transmit the lock signal to transmitter, and controls one receiver to transmit the lock signal to another receiver. The lock signal relates to transmitter link state and receiver link state. When transmitter transmits the lock signal to receiver, a phase of the lock signal will be reversed for the receiver to detect whether its own frequency is correct. | 01-21-2016 |
20160021669 | MAC PROTOCOL FOR FULL DUPLEX WIRELESS COMMUNICATIONS - Disclosed in some examples are systems, methods, and machine readable mediums which allow for the deployment of advanced radios which are capable of simultaneous transmission and reception on the same frequency in existing wireless networks, while maintaining backward compatibility with older devices. | 01-21-2016 |
20160036582 | SYSTEM AND METHOD FOR FULL DUPLEX CANCELLATION - Disclosed herein are systems, methods, and computer-readable storage media for enabling improved cancellation of self-interference in full-duplex communications, or the transmitting and receiving of communications in a single frequency band without requiring time, frequency, or code divisions. The system estimates the signal strength and phase of a self-interference signal, generates a cancellation signal based on this estimate, then uses the cancellation signal to suppress the self-interference before sampling received analog signal. After applying the cancellation signal, the system samples and digitizes the remaining analog signal. The digitized signal is then subjected to additional digital cancellation, allowing for extraction of the desired signal. | 02-04-2016 |
20160043767 | Transmitter Receiver Leakage Reduction In A Full Duplex System Without The Use Of A Duplexer - A transceiver suitable for frequency duplex division communication is disclosed. The transceiver comprises a transmitter, wherein the transmitter comprises a power amplifier; a receiver; an auxiliary power amplifier which is arranged to provide a controllable phase shift and gain output; a first filter arranged at an output of the power amplifier arranged to attenuate frequencies at a receiving frequency of the receiver; a second filter arrangement at an output of the auxiliary power amplifier arranged to attenuate frequencies at a receiving frequency of the receiver; and a signal transmission arrangement. The signal transmission arrangement is arranged to transmit signals provided from the transmitter through its power amplifier to a radio frequency, RF, connecting point, receive signals from the RF connecting point and provide the signals to the receiver, and provide signals from the auxiliary amplifier towards an input of the receiver. The transceiver also comprises a controller, wherein the controller is arranged to control the auxiliary power amplifier output to provide a signal that has a phase and amplitude in relation to the output of the power amplifier of the transmitter such that the transmitter contribution to the signal at the input of the receiver is suppressed. A method of controlling the transceiver, a communication device and computer program are also disclosed. | 02-11-2016 |
20160043858 | AMPLIFIER SUPPORTING MULTI MODE AND AMPLIFYING METHOD THEREOF - An amplifier and an amplifying method are provided. The amplifier includes: an amplifying unit amplifying and transferring a transmission target signal to a TDD switch; the TDD switch transferring a signal received from the amplifying unit to a filter unit when the amplifier operates in a TDD mode, and transferring a signal received from the filter unit to a duplex mode selection switch; the duplex mode selection switch transferring a signal received from the filter unit to a receiving side; and a controller controlling the duplex mode selection switch to transfer the signal received from the filter unit to the receiving side without passing through the TDD switch when the received duplex mode selection signal is a FDD mode selection signal. | 02-11-2016 |
20160049985 | SWITCHABLE RF TRANSMIT/RECEIVE MULTIPLEXER - A switchable RF transmit/receive (TX/RX) multiplexer, which includes a group of RF TX bandpass filters, a group of RF TX switching elements, and a group of RF RX bandpass filters; is disclosed. The group of RF TX bandpass filters includes a first RF TX bandpass filter and a second RF TX bandpass filter, such that each of the first RF TX bandpass filter and the second RF TX bandpass filter is coupled to a first filter connection node. The group of RF TX switching elements includes a first RF TX switching element coupled between the first filter connection node and a first common connection node, which is coupled to a first RF antenna. Each of the group of RF RX bandpass filters is coupled to the first common connection node. | 02-18-2016 |
20160049986 | DEVICE FOR TRANSMITTING AND RECEIVING CARRIER AGGREGATION SIGNAL - Disclosed is a signal transmit and receive device capable of receiving and processing both a carrier-aggregated (CA) receive signal and a non-CA receive signal, and transmitting both a CA transmit signal and a non-CA transmit signal, through a common antenna. The CA receive signal and the non-CA receive signal may be amplified by receiving circuits having differing receiver sensitivities to optimize performance. The CA transmit signal and non-CA transmit signal may be provided at differing signal levels so as to minimize power consumption. | 02-18-2016 |
20160050062 | System and Method for Radio Full Duplex - In one embodiment, a method for calibrating a full-duplex radio system includes transmitting, by a first radio transmitter, a first signal and receiving, by a first radio receiver, a first version of the first signal. The method also includes receiving, by a second radio receiver, a second version of the first signal and transmitting, by a second radio transmitter, a second signal. Additionally, the method includes receiving, by the first radio receiver, a received version of the second signal and determining a response from the second radio transmitter to the first radio receiver in accordance with the first version of the first signal, the second version of the first signal, and the received version of the second signal. | 02-18-2016 |
20160072618 | TOWER MOUNTED AMPLIFIER AND FILTER THEREOF - A tower mounted amplifier and a filter The filter includes a transmission part having a first tunable portion and a reception part having a second tunable portion and a third tunable portion. The transmission part is coupled between a first port and a second port. The second tunable portion of the reception part is coupled between the first port and a third port, and the third tunable portion of the reception part is coupled between a fourth port and the second port. The first tunable portion is configured to work in a first frequency range different from a first pass band in which the second and third tunable portions are controlled to work when a radio frequency signal is to be transmitted from the first port to the second port, the radio frequency signal being rejected by the first tunable portion to the second port. | 03-10-2016 |
20160087673 | CANCELLATION CIRCUITS AND TRANSCEIVER CIRCUITS TO SUPPRESS INTERFERENCE - An interference-cancelling circuit includes a main delay line, a first power divider, a first power combiner, and first circuits. The main delay line delays a number of transmitting signals. The first power divider is coupled to the main delay line. Each of the first circuits including n branch circuits is configured to generate cancellation signals for canceling leakage signals (where “n” is an integer of 2 or more). A first branch circuit of the n branch circuits is coupled between the first power divider and the first power combiner. A (k−1)-th branch circuit of the n branch circuits is coupled to a k-th branch circuit of the n branch circuits (where “k” is an integer from 2 to n). The first power combiner outputs cancellation signals generated by the first circuit. A transceiver circuit is also provided. | 03-24-2016 |
20160094331 | Multiplexers and Duplexers Having Active Cancellation for Improved Isolation between Transmit and Receive Ports - A multiplexer is configured to receive a transmit signal from a first amplifier and to provide a receive signal to a second amplifier. A leakage signal is transmitted to a path leading to the second amplifier. A first device configured to provide a portion of the transmit signal to an active cancellation circuit, the active cancellation circuit configured to substantially invert the phase of the portion of transmit signal and to attenuate the amplitude of the portion of the transmit signal. A second device configured to receive the portion of the transmit signal from the active cancellation circuit, and to combine the portion of the transmit signal from the active cancellation circuit with the leakage signal prior to an input to the second amplifier. | 03-31-2016 |
20160094332 | Systems and Methods for Analog Cancellation for Division Free Duplexing for Radios Using MIMO - System and method embodiments are provided for analog cancellation for division free duplexing for radios using MIMO. In an embodiment, a system for minimizing transmitted signals from a transmitter appearing at a co-located receiver in a division free duplexing radio includes a transmitter to transmit an analog transmitted signal; an antenna; a circulator coupled to the transmitter and the antenna; a tuning algorithm component configured to receive a copy of the analog transmitted signal from the transmitter and a sampled analog received signal from a received signal path from the circulator, wherein the sampled analog received signal is sampled at a point in the received signal path before the analog received signal is provided to a receiver; and a multitap cancellation component configured to provide a cancellation signal to couple to the analog received signal such that an amount of the analog transmitted signal appearing at the receiver is reduced. | 03-31-2016 |
20160105211 | METHOD AND APPARATUS FOR RECONSTRUCTING DESIRED SIGNAL IN CASE OF USING FULL DUPLEX RADIO (FDR) SCHEME - The apparatus for reconstructing a desired signal using a full duplex radio (FDR) scheme includes: a digital self-interference cancellation unit configured to output a first digital signal; a demodulator configured to demodulate the first digital signal; a modulator configured to modulate the demodulated first digital signal; an attenuator configured to attenuate the modulated first digital signal by applying an attenuation coefficient to the modulated first digital signal; and an operation unit configured to receive the attenuated first digital signal and the first digital signal, and transmit a residual signal to the digital self-interference cancellation unit, wherein the residual signal is obtained by subtracting the attenuated first digital signal from the first digital signal. | 04-14-2016 |
20160105213 | METHODS FOR CANCELLATION OF RADIO INTERFERENCE IN WIRELESS COMMUNICATION SYSTEMS - A full duplex radio includes self-interference cancellation circuitry for reducing self-interference. The self-interference cancellation circuitry may receive analog radio frequency signals that are to be transmitted by an antenna, and downconvert and digitize the signals to provide a digital baseband signal for processing, for example by an adaptive filter. The filtered signal may be Cconverted to an analog signal and applied in an analog portion of a receive chain of a receiver of the full duplex radio. Preferably the analog signal is applied in the receive chain after low noise amplification of received signals of interest. | 04-14-2016 |
20160105272 | Systems and Methods for Leak Suppression in a Full Duplex System - A system and method for leak suppression in a full duplex system is disclosed. In an embodiment, a system for wireless transmission and reception includes a circulator having a common port, an input port and an output port; a conjugate matching tuner coupled to the common port; and an antenna coupled to the conjugate matching tuner, an impedance of the antenna being conjugate matched to an impedance of the common port of the circulator by the conjugate matching tuner. | 04-14-2016 |
20160112078 | TERMINAL AND POWER CHARCHING METHOD THEREOF - Disclosed herein are a terminal and a power charging method thereof. The terminal may include: an information transmitter generating a first signal corresponding to an uplink signal transmitted to a base station; and a power harvester receiving a self-interference signal generated by the first signal and charging power using the self-interference signal. | 04-21-2016 |
20160119016 | ANTENNA SWITCHING IN A COMMUNICATION CIRCUIT - Aspects disclosed in the detailed description include antenna switching for a communication circuit. A communication circuit includes an antenna switching circuit that couples the communication circuit to a first antenna and/or a second antenna for radio frequency (RF) signal transmission and reception. The antenna switching circuit is configured to include fewer antenna switches compared to a conventional antenna switching circuit to reduce the cost and footprint of the communication circuit. Furthermore, by reducing the number of antenna switches in the antenna switching circuit, it is possible to improve RF isolation between the first antenna and the second antenna, thus leading to improved RF performance of the communication circuit. | 04-28-2016 |
20160119019 | FULL DUPLEX RADIO - Embodiments of full duplex radios are disclosed herein. For example, a radio may include: a first transmitter, a second transmitter, and a receiver. The first transmitter may be configured to receive an input signal, process the input signal to generate a first transmit signal, and transmit the first transmit signal. The second transmitter may be configured to receive the input signal, process the input signal to generate a second transmit signal, and couple the second transmit signal into an input path of the receiver. Leakage at the receiver may thus be reduced. Some embodiments of a radio may also include a base band correction circuit and means for reducing transmitter noise that leaks into the receiver. | 04-28-2016 |
20160119020 | MIMO Antenna Leakage Canceller System - A system includes a first duplexer that receives samples of a signal transmitted from a first transmit portion of a communication device and outputs a filtered signal based on sampled transmitted signal. A first modulator adjusts the filtered signal based on at least one of a phase, amplitude, and delay of leakage associated with the transmitted signal. The leakage corresponds to leakage from the first transmit portion of the communication device to a first receive portion of the communication device. The first modulator provides a leakage cancellation signal based on the adjusted filtered signal. A first coupler subtracts the leakage cancellation signal from a signal received by the first receive portion of the communication device. | 04-28-2016 |
20160119110 | APPARATUS AND METHOD FOR CANCELLING SELF-INTERFERENCE SIGNAL IN RF FRONT END - The apparatus includes a transmission signal divider for dividing and transmitting a received signal to a transmission antenna and an attenuator, an attenuator for applying a predetermined attenuation factor to the transmitted signal divided to the attenuator, a phase shifter for phase-shifting the signal to which the attenuation factor is applied by a predetermined phase, and a time delayer for time-delaying the phase-shifted signal by a predetermined time. | 04-28-2016 |
20160127065 | SWITCHING SUB-SYSTEM FOR DISTRIBUTED ANTENNA SYSTEMS USING TIME DIVISION DUPLEXING - A switching control module can optimize time division duplexing operations of a distributed antenna system (“DAS”). The switching control module can include a measurement receiver and a processor. The measurement receiver can measure signal powers of downlink signals in a downlink path of the DAS. The processor can determine start times for downlink sub-frames transmitted via the downlink path based on downlink signal powers measured by the measurement receiver exceeding a threshold signal power. The processor can identify a clock setting that controls a timing of switching signals used for switching the DAS between an uplink mode and a downlink mode. The processor can statistically determine a switching time adjustment for the clock setting based on switching time differentials between the clock setting and the start times. The processor can update the clock setting based on the switching time adjustment. | 05-05-2016 |
20160127112 | SYSTEMS FOR MULTI-PEAK-FILTER-BASED ANALOG SELF-INTERFERENCE CANCELLATION - A system for multi-peak filter-based analog self-interference cancellation includes a transmit coupler that samples the analog transmit signal to create a sampled analog transmit signal; an analog self-interference canceller, using multi-peak filters, that generates an analog self-interference cancellation signal; and a receive coupler that combines the analog self-interference cancellation signal with the analog receive signal. | 05-05-2016 |
20160127113 | Wireless Full-Duplex System and Method Using Sideband Test Signals - A full-duplex transceiver is provided with componentry and methods for cancellation of nonlinear self-interference signals. The transceiver is capable of receiving an incoming radio-frequency signal that includes both a desired radio-frequency signal component and a self-interference component caused by the transceiver's own radio-frequency transmission. The transceiver demodulates the incoming radio-frequency signal to generate a first demodulated signal. The transceiver combines an analog corrective signal with the first demodulated signal to generate a second demodulated signal with reduced self-interference. The transceiver processes the first and second demodulated signals to determine a desired incoming baseband signal and to determine nonlinear components of the self-interference signal, such as nonlinearities introduced by the transceiver's power amplifier. | 05-05-2016 |
20160127115 | FRONT-END CIRCUIT - A front-end circuit includes a switching circuit and a low-pass filter. The switching circuit includes common terminals and to-be-selected terminals. The common terminals are connected to each other, and a connection point at which the common terminals are connected to each other is connected to an antenna. The common terminal is directly connected to the connection point. The common terminal is connected to the connection point with the low-pass filter interposed there between. | 05-05-2016 |
20160142198 | RF DUPLEXING DEVICE - Radio frequency (RF) duplexing devices and methods of operating the same are disclosed. In one embodiment, an RF duplexing device includes a transmission port, a receive port, a first duplexer, and a second duplexer. The first duplexer is coupled to the transmission port and the receive port, and is configured to provide a first phase shift from the transmission port to the receive port. The second duplexer is also coupled to the transmission port and the receive port. However, the second duplexer is configured to provide a second phase shift that is differential to the first phase shift from the transmission port to the receive port. By providing the second phase shift so that the second phase shift is differential to the first phase shift, the RF duplexing device can provide isolation through cancellation without needing to introduce significant insertion losses. | 05-19-2016 |
20160156456 | SINGLE CHANNEL FULL DUPLEX WIRELESS COMMUNICATION | 06-02-2016 |
20160173138 | DEVICE FOR BI-DIRECTIONAL AND MULTI-BAND RF COMMUNICATION OVER SINGLE RESONANT TRANSMISSION LINE AND METHOD OF ITS REALIZATION | 06-16-2016 |
20160173164 | METHOD OF CANCELLING SI SIGNAL AT RF-FRONT END AND UE FOR THE SAME | 06-16-2016 |
20160173263 | MOBILE TERMINAL APPARATUS, BASE STATION APPARATUS AND COMMUNICATION CONTROL METHOD | 06-16-2016 |
20160182210 | DUPLEXER | 06-23-2016 |
20160183304 | Spatial reuse clear to send (CTS) within wireless communications | 06-23-2016 |
20160197690 | METHODS, USER EQUIPMENT AND RADIO NETWORK NODE FOR INTERFERENCE MITIGATION IN A DYNAMIC TIME DIVISION DUPLEX SYSTEM | 07-07-2016 |
20160198410 | Low Power Operations In A Wireless Tunneling Transceiver | 07-07-2016 |
20160204825 | TERMINAL AND METHOD FOR IMPROVING TERMINAL RECEPTION SENSITIVITY | 07-14-2016 |
20160204929 | Single Channel Full-Duplex Joint Radar and Communication | 07-14-2016 |
20160254828 | HIGH-FREQUENCY FRONT END CIRCUIT | 09-01-2016 |
20160380668 | COMMUNICATION DEVICE AND RECEIVING METHOD - A communication device includes a sending unit that sends a plurality of signals that are to be wirelessly sent with different frequencies; an acquiring unit that acquires a reception signal to which an intermodulation signal that is produced due to intermodulation of the plurality of signals is added; and a processor that is connected to the sending unit and the acquiring unit. The processor generates, on the basis of the plurality of signals sent by the sending unit, a cancellation signal corresponding to the intermodulation signal and combines the generated cancellation signal with the reception signal acquired by the acquiring unit. | 12-29-2016 |
20160380799 | METHOD AND APPARATUS FOR TUNING FINITE IMPULSE RESPONSE FILTER IN IN-BAND FULL DUPLEX TRANSCEIVER - A method and an apparatus for tuning an FIR filter in an in-band full duplex transceiver. The method for tuning an FIR filter may include: setting attenuation of the FIR filter to be a first value and then estimating input information of the FIR filter; estimating a delta response using the estimated input information of the FIR filter; and updating the attenuation of the FIR filter to a second value using the estimated delta response. | 12-29-2016 |
20170237547 | FULL DUPLEX RECONFIGURABLE ANTENNA SELF-INTERFERENCE CANCELLATION SYSTEMS | 08-17-2017 |
20180026606 | DUPLEXER | 01-25-2018 |
20180026619 | POWER SOURCE SUPPLY CIRCUIT, AMPLIFIER, COMMUNICATION DEVICE, BASE STATION, AND POWER SOURCE SUPPLY METHOD | 01-25-2018 |
20180026673 | METHOD AND SYSTEM FOR MITIGATING THE EFFECTS OF A TRANSMITTED BLOCKER AND DISTORTIONS THEREFROM IN A RADIO RECEIVER | 01-25-2018 |
20180026773 | METHOD FOR ESTIMATING, BY DEVICE USING FDR SCHEME, NON-LINEAR SELF-INTERFERENCE SIGNAL CHANNEL | 01-25-2018 |
20180026775 | METHODS AND DEVICES FOR SELF-INTERFERENCE CANCELATION | 01-25-2018 |
20180026776 | SELF-INTERFERENCE SIGNAL CANCELLATION APPARATUS AND TRANSCEIVER INCLUDING THE SAME | 01-25-2018 |
20190149186 | ANALOG SELF-INTERFERENCE CANCELLATION SYSTEMS FOR CMTS | 05-16-2019 |