Entries |
Document | Title | Date |
20080205487 | CLEAN SENSING FOR DYNAMIC FREQUENCY HOPPING IN DYNAMIC SPECTRUM ACCESS NETWORKS - Clean and reliable channel sensing during dynamic frequency hopping over a plurality of overlapping wireless regional area network (WRAN) cells is conducted using a minimum number of channels. By coordinating a phase-shift of the operation periods of each WRAN cell over a minimum number of working channels, interruption-free communication and data transmission for each of the WRAN cells as well as interference-free channel sensing can be achieved. | 08-28-2008 |
20080219323 | FAST AND RELIABLE CHANNEL CLASSIFICATION ALGORITHMS IN BLUETOOTH NETWORKS TO DETECT AND AVOID 2.4 GHZ INTERFERERS - Aspects of a method and system for fast and reliable channel classification in Bluetooth networks to detect and avoid channel interferers may include one or more processors that may enable performance of signal strength measurements on received Bluetooth signals at a current selected frequency. At least one data packet received via the Bluetooth signals may be processed to determine the presence of bit errors. The processor(s) may enable characterization of the Bluetooth signals at the current selected frequency based on the signal strength measurements and/or the processing of the data packets. The current selected frequency may be selected during adaptive frequency hopping based on the characterization. | 09-11-2008 |
20080219324 | METHOD AND APPARATUS FOR GENERATING A HOPPING SEQUENCE IN A COMMUNICATION SYSTEM - A method and apparatus for generating a hopping sequence according to a seed value in a communication system are provided. The apparatus and method for generating a hopping sequence indicating a hopping pattern of carrier frequencies or time slots in a communication system include, when a seed value is input, setting a window to be applied to the seed value, calculating a window value according to the set window and generating a sequence by storing values in sequence arrangement to the calculated window value. The apparatus and method reduce the necessary size of a memory unit for storing a hopping sequence. | 09-11-2008 |
20080240204 | METHOD AND SYSTEM FOR CHANNEL ESTIMATION - The present invention is directed to a system and method for channel estimation for a communication channel such as, for example, that found in a wireless communication network. One or more synchronization and channel estimate symbols can be combined to compute a refined channel estimate. | 10-02-2008 |
20080240205 | WIRELESS DEVICE - A wireless device including a first radio communication portion configured to effect radio communication with a first external communication device while using frequency bands selected one after another from among a group of frequency bands, a field intensity measuring portion which is configured to measure a field intensity value for each of a plurality of frequency bands belonging to at least the group of frequency bands and which is provided in a portion different from the first radio communication portion, and an excluding portion configured to exclude each of the above-indicated plurality of frequency bands for which the measured field intensity value is higher than a predetermined threshold value, from the above-indicated group of frequency bands. | 10-02-2008 |
20080273575 | Method and apparatus for cooperative coexistence between wireless communication protocols - A method and apparatus of reducing interference between subsystems implementing wireless communication protocols is disclosed. The method comprises reducing interference in a first subsystem implementing a first wireless communication protocol operating in a first frequency band caused by a second subsystem implementing a second wireless communication protocol operating in a second frequency band, the second wireless communication protocol employing Adaptive Frequency Hopping (AFH), the method comprising calculating one or more frequencies to be avoided by the second subsystem on the basis of one or more frequencies in use by the first subsystem. | 11-06-2008 |
20080273576 | RADIO TRANSMISSION APPARATUS, RADIO RECEPTION APPARATUS, TRANSCEIVER, AND RADIO COMMUNICATION METHOD - A radio transmission apparatus that uses a plurality of band groups and that transmits a signal subjected to frequency hopping between a plurality of bands in each band group at a local frequency apart from the center frequency of each band includes a local frequency generating unit that generates a local frequency lower than the center frequency of each band in a first band group in the transmission with the first band group. The local frequency generating unit generates a local frequency higher than the center frequency of each band in a second band group in the transmission with the second band group, the local frequency to be generated being the same as the local frequency generated in the transmission with the first band group. | 11-06-2008 |
20080279257 | Random Access Dimensioning Methods And Procedues For Frequency Division Multiplexing Access Systems - A method of determining random access resources performed by a mobile terminal, the method comprising: receiving information on available random access resources from a network; deciding how to derive the random access resources to be allowed based on default values or information received from the network; measuring received signal quality of at least one of a cell to be accessed and a neighboring cell; and deriving the allowed random access resources based on the deciding and the measuring. | 11-13-2008 |
20080285625 | FREQUENCY SYNTHESIZER APPLIED TO FREQUENCY HOPPING SYSTEM - A frequency synthesizer applied to a frequency hopping system includes a voltage controlled oscillator (VCO), a phase lock loop (PLL) system, a second frequency divider, a first SSB mixer, a second SSB mixer, and a multiplexer. The VCO generates an oscillating frequency. The PLL system includes a first frequency divider and divides the oscillating frequency by 10 to generate a first dividing signal. The second frequency divider divides the oscillating frequency by 2 to generate a second dividing signal and further divides the second dividing signal by 2 to generate a third dividing signal. The first SSB mixer mixes frequencies of the second and third dividing signals to generate a first mixing signal. The second SSB mixer mixes frequencies of the first mixing signal and the first dividing signal to generate a second mixing signal. The Multiplexer determines to output the first mixing signal or the second mixing signal. | 11-20-2008 |
20080291975 | Method for Operating an Enciphered Radio Network - An approach is provided for operating a radio network, wherein the operating frequency is varied systematically according to an enciphered sudden-frequency-change scheme and retained only during a hop. Several hops are combined to form a service interval, a service window being arranged at a variable position within the service interval. Given hops for different functionalities (late traffic entry, break-in, hailing, late network entry) of the radio network are specified in the service window. | 11-27-2008 |
20080291976 | COMMUNICATION DEVICE, COMMUNICATION METHOD, COMMUNICATION SYSTEM AND PROGRAM - A communication device of the present invention includes channel compensations, an adaptive processor, a MAC and a controller. The channel compensations weight each of signals received by a plurality of antennas based on an SN ratio of the received signals so as to control the antennas to operate as combining diversity systems. The adaptive processor weights each of the signals received by the plurality of antennas so as to suppress the interference signal and to control the antennas to operate as adaptive array antennas. The MAC detects frequency hopping information of the received signals. The controller changes between the operation of the combining diversity systems and the operation of the adaptive array antennas, based on the frequency hopping information. | 11-27-2008 |
20080298433 | Coordinated cyclic shift and sequence hopping for Zadoff-Chu, modified Zadoff-Chu, and block-wise spreading sequences - A cyclic shift of a reference signal is quantized as a combination of a cell specific cyclic shift with an outcome of a pseudo-random hopping, and an indication of the cell specific cyclic shift is broadcast in the cell. In one embodiment the cyclic shift is quantized as a modulo operation on a sum of the cell specific cyclic shift, the outcome of the pseudo-random hopping, and a user specific cyclic shift, in which case an indication of the user specific cyclic shift is sent in an uplink resource allocation and a user sends its cyclically shifted reference signal in the uplink resource allocated by the uplink resource allocation. The cyclic shift may also be quantized according to length of the reference signal as cyclic_shift_symbol=(cyclic_shift_value*length of the reference signal)/12; where cyclic_shift_value is between zero and eleven and cyclic_shift_symbol is the amount of cyclic shift given in reference signal symbols. | 12-04-2008 |
20080317100 | Method and Device for Blind Dehopping - A method and device are disclosed for real-time characterization of frequency-hopping networks, in which the signal to be characterized is converted into a digital signal and the frequency characteristics of the signal are determined. A frequency hop is sought for synchronization with the start of the transmission. The frequency is tracked and the central frequency Fc of the required transmission channel is sought. A delay is applied to the digitized samples during the tracking phase. The samples corresponding to the signal step are determined on the basis of the delayed samples and the identified central frequency. | 12-25-2008 |
20090022208 | METHOD AND SYSTEM FOR RAPIDLY DETECTING THE PRESENCE OF INTERFERERS IN BLUETOOTH FREQUENCY HOPPING - Methods and systems for wireless communication are disclosed and may include sweeping a signal detection frequency one or more times across a plurality of steps in a frequency range. The measured signal strength at each step may be compared to a threshold, and a status may be stored, which may depend on the presence of a measured signal strength above threshold. The detection frequency may be swept utilizing a voltage controlled oscillator, which may be tuned via a control voltage and/or calibration capacitors. Steps may be skipped when a measured signal strength may be greater than the threshold, and may occur after multiple above threshold measurements. The steps may have variable frequency width, and the range may include the Bluetooth band from 2.40 GHz to 2.48 GHz. The frequency may be swept over a subset of the Bluetooth band, and may be swept on a periodic basis. | 01-22-2009 |
20090041088 | METHODS AND APPARATUSES FOR CHANNEL ASSESSMENT - An embodiment of an apparatus for channel assessment is provided, comprising a radio frequency (RF) unit, a baseband unit and a microprocessor control unit (MCU). The baseband unit coupling to the RF unit directs the RF unit to selectively hop into one of a plurality of available channels in a frequency band using a pseudorandom sequence to receive a plurality of packets via the hopped channel. The MCU coupling to the baseband unit accumulates a measure for the hopped channel according to reception results of the packets and marks the hopped channel as a bad channel when the accumulated measure exceeds a predetermined threshold. The measure represents the inaccuracy extent during packet reception via the hopped channel. | 02-12-2009 |
20090052499 | SYSTEM, METHOD AND APPARATUS FOR MANAGING COMMUNICATION IN A PUBLIC SAFETY COMMUNICATION NETWORK - A method, system and apparatus for managing communication in a Public Safety Communication Network (PSCN). The PSCN includes a plurality of Mobile Stations (MSs) ( | 02-26-2009 |
20090074032 | DISTRIBUTED SPECTRUM ALLOCATION SCHEME FOR COGNITIVE RADIO - A technique ( | 03-19-2009 |
20090074033 | COST EFFICIENT SPECTRAL-REUSE TRANSCEIVER - An operational mechanism enables frequency re-use techniques, including selective frequency hopping and channel aggregation, on very low-cost transceiver hardware. | 03-19-2009 |
20090080497 | SYSTEM AND METHOD FOR CONCURRENT FREQUENCY HOPPING OF RADIO COMMUNICATIONS - A method and system for selecting frequency channels for a concurrent dual transceiver system are provided. In one aspect, a single hop table for at least two transceivers is used. The single hop table tracks information associated with a plurality of frequency channels that the transceivers can use. An available frequency channel is randomly selected using the single hop table and a transceiver is allowed to communicate via the selected frequency channel for allowed time duration. If communication has not completed for the current communication request, another frequency channel that is available is selected randomly and used. Multiple transceivers may communicate concurrently using this frequency channel selection and hopping method. | 03-26-2009 |
20090086791 | METHOD FOR DATA TRANSMISSION AND COMMUNICATION SYSTEM - In one embodiment, a method for data transmission is provided comprising determining a set of frequency bands available for data transmission from a plurality of frequency bands; determining whether there is a frequency band of the plurality of frequency bands that lies between two frequency bands of the set of frequency bands and is not in the set of frequency bands; selecting, in case that there is a frequency band of the plurality of frequency bands that lies between two frequency bands of the set of frequency bands and is not in the set of frequency bands, another set of frequency bands from the plurality of frequency bands such that there is no frequency band of the plurality of frequency bands that lies between two frequency bands of the other set and is not in the other set; and transmitting the data using the other set of frequency bands. | 04-02-2009 |
20090092174 | OPTIMIZING TRANSMISSION FOR BROADCAST MULTICAST SERVICE - The present invention is method and system for transmitting a signal in a wireless communication system. The present invention includes differentiating a data stream into at least a first layer data stream and a second layer data stream. At least the first layer data stream and the second layer data stream are then channel coded. Afterward, at least one of the channel coded first layer data stream and the channel coded second layer data stream is spread. | 04-09-2009 |
20090122837 | Approach For Managing The Use Of Communications Channels Based On Performance - An approach for selecting sets of communications channels involves determining the performance of communications channels. A set of channels is selected based on the results of performance testing and specified criteria. The participant generates data that identifies the selected set of channels and provides that data to other participants of the communications network. The participants communicate over the set of channels, such as by using a frequency hopping protocol. When a specified time expires or monitoring of the performance of the channel set identifies poor performance of the set of channels, the participant selects another set of channels for use in communications based on additional performance testing. By selecting channels based on the initial performance testing and performance monitoring, the communications network adaptively avoids channels with poor performance. | 05-14-2009 |
20090161728 | SYSTEM AND METHOD FOR INTEGRATING MULTIPLE RADIOS OF DIFFERENT PROTOCOLS - A method, apparatus, and electronic device for regulating communication are disclosed. A first radio | 06-25-2009 |
20090168844 | OFDM signal spectrum shaping - An orthogonal frequency division multiplexing (OFDM) signal spectrum shaping device comprises an input interface configured to receive an input signal, a modulation portion coupled to the input interface, configured to modulate the input signal to generate a plurality of uncompensated sub-carriers, and a sub-carrier gain control module configured to selectively apply a plurality of gain factors to the plurality of uncompensated sub-carriers to generate a plurality of compensated sub-carriers that are substantially equal in amplitude. | 07-02-2009 |
20090185599 | Adjusting a transmit time of a wireless device - Methods of adjusting a transmit time of a wireless device are disclosed. One method includes a receiver determining a frequency hopping sequence of an interfering signal. The receiver obtains an observed pattern of at least one of time and frequency overlap between the interfering signal and a signal of interest. The receiver determines a desired pattern of at least one of time and frequency overlap between the interfering signal and the signal of interest. A desired transmit time delay of the signal of interest is adjusted based on a difference between the observed pattern and the desired pattern. | 07-23-2009 |
20090257473 | RFID Fast Hop Frequency Hopping - Methods and apparatus, including computer program products, for RFID fast hop frequency hopping. A method including transmitting from a radio frequency identification (RFID) interrogator a continuous wave un-modulated radio frequency (RF) signal from a frequency synthesizer based on digital waveform reconstruction with Direct Memory Access (DMA), the continuous wave un-modulated RF signal conforming to a fast hop frequency hopping protocol in which each hop of a plurality of hops spans at least one bit but less than the totality of bits to be sent from a single RFID device data in a single communications session. | 10-15-2009 |
20090296785 | Multi-Mode Coexistence Method of a Multi-Mode Communication Device - The present invention discloses a multi-mode coexistence method of a multi-mode communication device comprising steps of: setting priorities of frequency usage for all modes supported by the multi-mode communication device; determining a channel where a signal of a lower priority mode are interfered with by that of a higher priority mode; performing frequency hopping to outside said determined channel by the lower priority mode. The invention allows signals of various modes to coexist in the multi-mode communication device without modifying the existing RF reception system, and thus reduces the system cost and implementation complexity. | 12-03-2009 |
20090304044 | FREQUENCY-HOPPING ARRANGEMENT - A frequency-hopping arrangement comprises a basic-frequency branch (DIV | 12-10-2009 |
20090316754 | METHOD FOR DECODING DIGITAL DATA IN A FREQUENCY HOPPING COMMUNICATION SYSTEM - An improved method is provided for decoding data in a frequency hopping communications system. The method includes: monitoring transition points between data bits in a demodulated data stream, where the data bits are transmitted to a receiver over different transmission frequencies; determining a frequency over which data bits are transmitted to the receiver; determining a reliability metric for each frequency over which data bits were received, where the reliability metric is based on transition points of data bits transmitted over a given frequency; and performing a decoding operation using the reliability metric for each frequency over which data bits were received. | 12-24-2009 |
20100046582 | Gigabit Spread-Spectrum Wireless Networking - The patent of Nathan Parker on the related spectrum-sensing broadband modem/router is capable of producing gigabit transfer rates of data. However, none of the current wireless networking standards are capable of producing gigabit data transfer rates. This patent would allow this type of standard to exist, as well as produce the wireless cards that would take advantage of this new standard. The transmitter for this new standard would also be integrated into the spectrum-sensing broadband modem/router. | 02-25-2010 |
20100086010 | COGNITIVE RADIO COMMUNICATION DEVICE FOR PERFORMING SPECTRUM SENSING AND DATA COMMUNICATION - A cognitive radio communication device including at least two radio frequency chains is provided. In order to perform a feature detection, the cognitive radio frequency device may reduce or eliminate a quiet time where a data communication is suspended using the at least two RF chains. While one RF chain performs the feature detection, another RF chain may perform the data communication. | 04-08-2010 |
20100158077 | SPREAD SPECTRUM TRANSCEIVER MODULE UTILIZING MULTIPLE MODE TRANSMISSION - A data transceiver module for digital data communications in a portable hand-held data terminal has multiple data spread spectrum modes which include direct sequence and frequency function modulation algorithms. The transceiver module has multiple user or program configurable data rates, modulation, channelization and process gain in order to maximize the performance of radio data transmissions and to maximize interference immunity. Various module housings, which may be PCMCIA type, are able to be mated with a suitably designed data terminal. Media access control protocols and interfaces of multiple nominal operational frequencies are utilized. Wireless access devices in a cell based network each consider a variety of factors when choosing one of a plurality of modes of wireless operation and associated operating parameters. Such selection defines a communication channel to support wireless data, message and communication exchanges. In further embodiments, the wireless access devices also support a second channel, a busy/control channel, for managing communication on the main communication channel and to overcome roaming and hidden terminal problems. Roaming terminal devices are also configured to support the dual channel design. Such configuration in both circumstances may involve the use of a multimode radio that is timeshared between the two channels or two radios, one dedicated to each channel. | 06-24-2010 |
20100172393 | PULSE ARBITRATION FOR NETWORK COMMUNICATIONS - An apparatus for communications configured to support first and second spread-spectrum channels, each of the first and second channels being based on a different pseudorandom sequence. The apparatus further configured to select one of the first and second channels for communications to avoid a collision of information that would otherwise occur based on their pseudorandom sequences. | 07-08-2010 |
20100195700 | Cyclic Shift Sequence Generation Method, Radio Communication Terminal Device, and Radio Communication Base Station Device - Provided is a cyclic shift sequence generation method which can prevent coming of an interference wave into a desired wave detection window even if a cyclic shift sequence has a high mutual correlation in different bandwidths, thereby improving a channel estimation accuracy in a base station. In this method, a cyclic shift sequence number to be allocated to a cell is decided in advance. Moreover, when the cyclic shift amount between cyclic shift sequences allocated in cells is Δ | 08-05-2010 |
20100202494 | ULTRA WIDEBAND MODULATION FOR BODY AREA NETWORKS - A symbol modulation system applicable to a body area network is disclosed herein. The symbol modulation system includes a symbol mapper. The symbol mapper is configured to determine a time within a predetermined symbol transmission interval at which a transmission representative of the symbol will occur. The time is determined based on a value of a symbol and a value of a time-hopping sequence. The time is selected from a plurality of symbol value based time slots, and a plurality of time-hopping sequence sub-time-slots within each symbol value based time slot. The symbol mapper is configured to generate a single guard interval within the symbol transmission interval. The single guard interval is positioned to terminate the symbol transmission interval. | 08-12-2010 |
20100272151 | TRANSCEIVER WITH PLURAL SPACE HOPPING PHASED ARRAY ANTENNAS AND METHODS FOR USE THEREWITH - A wireless transceiver includes a plurality of phased array antennas, that transmit an outbound RF signal containing outbound data to remote transceivers and that receives an inbound RF signal containing inbound data from the remote RF transceivers, wherein the plurality of phased array antennas are each configurable based on a control signal. An antenna configuration controller generates the control signal to configure the phased array antenna to hop among a plurality of radiation patterns based on a hopping sequence. An RF transceiver section generates the outbound RF signal based on the outbound data and that generates the inbound data based on the inbound RF signal. In one configuration, a switching section selectively couples a selected one of the plurality of phased array antennas to the RF transceiver section, based on the control signal. In figuration, the RF transceiver section includes an RF section for each antenna array. | 10-28-2010 |
20100296547 | METHOD TO MODIFY THE FREQUENCY HOPPING SCHEME BY EXTENDING THE VALIDITY OF THE REFERENCE SIGNALS - The present invention increases the interference diversity in systems with the frame structure described above by using frequency hopping sequences that are selected considering characteristics of the channel relating to how the channel varies. According to a first embodiment, the channel characteristics relate to channel coherence time and according to a second embodiment, the channel characteristics relate to channel coherence bandwidth. For channels with long coherence times, the transmission hops back and forth several times during a TTI on the different available frequencies. For channels with widecoherence bandwidths, hopping may be performed between the frequency used by the reference signals and its neighbor frequencies. For channels with both long coherence times and widecoherence bandwidths, a combination may be used. | 11-25-2010 |
20100303128 | AGGREGATING LOWER BANDWIDTH ASYNCHRONOUSLY CLOCKED COMMUNICATION LINKS INTO A HIGHER BANDWIDTH LINK - A spread spectrum generator module is configured to provide data for spreading frequency spectra of at least first and second lower bandwidth asynchronously clocked communication links. A packet scheduling module aggregates the two (or more) lower bandwidth links into a higher bandwidth link or interface. The frequency spectra of the lower bandwidth links are spread in accordance with the data for spreading the frequency spectra. A downstream disaggregation element filters high frequency noise resulting from the spreading of the spectra. | 12-02-2010 |
20100303129 | FREQUENCY HOPPING METHOD FOR LOCALIZATION SYSTEM - A frequency hopping method for localization system is aimed to overcome the degradation of location accuracy due to radio interference if there are some other radio devices using the same radio frequency as a localization system. A Packet Reception Rate (PRR) thresholding or a learning-based approach for the diagnostic test is proposed. In that, a PRR thresholding or a set of parameters trained by Hidden Markov Model (HMM) is used as a criterion to decide whether or not to hop. The proposed hopping mechanism provides an accurate and stable localization with a minimum delay. | 12-02-2010 |
20100309952 | Distortion identification apparatus, test system, recording medium and distortion identification method - Provided is a signal output control section that inputs to a digitizer a reference signal whose frequency changes at each prescribed measurement cycle; a data extracting section that extracts a number of pieces of data corresponding to an integer multiple of a period of the reference signal in each measurement cycle, from pieces of data of a reference digital signal output by the digitizer according to the reference signal that come after a prescribed wait interval has passed since an initiation timing of each measurement cycle; a distortion identifying section that calculates the non-linear distortion caused by the digitizer for each frequency of the reference signal, based on the data in each measurement cycle extracted by the data extracting section; and a distortion calculating section that calculates the non-linear distortion caused by the digitizer when the analog signal input to the digitizer has a frequency that differs from any of the plurality of frequencies at which the reference signal transitions, based on the non-linear distortion detected by the distortion identifying section for each frequency. | 12-09-2010 |
20110002360 | PERMISSION-BASED SECURE MULTIPLE ACCESS COMMUNICATION SYSTEMS | 01-06-2011 |
20110019717 | HUMAN BODY COMMUNICATION APPARATUS FOR NON-CONTACT COMMUNICATIONS AND HUMAN BODY COMMUNICATION METHOD FOR NON-CONTACT COMMUNICATIONS IN THE SAME USING FREQUENCY SELECTIVE BASEBAND - Provided are a human body communication apparatus for non-contact communications using a frequency-selective baseband and a human body communication method for non-contact communications in the same. The human body communication apparatus may be useful to perform stable communications between users by reducing interference induced from other communication apparatuses without affecting interference between the users since data are transmitted/received between communication apparatuses adjacent to a human body by spreading and despreading the data using only spreading codes of a limited frequency band (frequency-selective baseband) in which an inductive electromagnetic field formed by an antenna shows the most effective characteristics. | 01-27-2011 |
20110069740 | METHODS AND SYSTEMS TO DIGITALLY SWITCH BETWEEN FREQUENCIES AND CORRESPONDING BANDWIDTHS IN A TRANSCEIVER - Methods and systems to maintain a tuner at a fixed frequency and to switch between frequencies and bandwidths in a digital domain. IQ imbalance equalization coefficients may be determined with respect to a frequency and bandwidth of a first signal, and the coefficients may be applied to baseband data associated with one or more other frequencies and/or bandwidths. Methods and systems disclosed herein may be applied in a multi-mode Multimedia over Coax Alliance (MoCA) environment, such as to digitally switch between a MoCA 2 standard and a MoCA 1.x standard. | 03-24-2011 |
20110075703 | FREQUENCY HOPPING METHOD AND BASE STATION FOR DOWNLINK DEDICATED PILOT FREQUENCY - A method for frequency hopping of a downlink dedicated pilot frequency, comprises: for the downlink dedicated pilot frequency, determining a frequency hopping offset corresponding to the downlink dedicated pilot frequency according to a cell identity of a cell to which it pertains (S | 03-31-2011 |
20110110398 | METHOD AND APPARATUS FOR INTERACTION OF CELL-SPECIFIC AND USER-EQUIPMENT-SPECIFIC SOUNDING REFERENCE SIGNAL PERIODICITY AND OFFSET - Certain aspects of the present disclosure relate to a technique for enabling transmission of sounding reference signals for uplink and downlink scheduling. | 05-12-2011 |
20110134963 | PHASE-LOCKED LOOP BASED CHAOTIC SPREAD SPECTRUM GENERATOR - Embodiments of the invention relate to apparatus and method for reducing electromagnetic interference (EMI) and radio frequency interference (RFI) in computer systems via a chaotic frequency modulation. In one embodiment, an apparatus comprises a first cell comprising a chaotic signal generator to generate a chaotic signal and a phase-locked loop (PLL) to generate a modulated output signal based at least on an un-modulated reference signal and the chaotic signal. | 06-09-2011 |
20110134964 | FREQUENCY SYNTHESIZER AND CONFIGURATION FOR AN ENHANCED FREQUENCY-HOPPING RATE - A frequency generating arrangement for generation of at least two predetermined frequencies is introduced. The arrangement comprises a phase locked loop circuit with at least two control value storage units and at least one controlled oscillator unit, wherein the control value storage units being configured to selectively output a control signal to the at least one voltage controlled oscillator unit, causing generation of one of the at least two predetermined frequencies. Frequency generating system for generation of ultra-fast hopping-frequency sequences comprises at least a first and a second frequency generating arrangement and further a controlling unit and a multiplexer unit for selectively connecting only one of the outputs of the two frequency generating arrangements with an output of the system. The controlling unit can be configured to control the system to generate a predetermined frequency sequence by controlling the two frequency generating arrangements such that during the period, in which one of the frequency generating arrangements is connected with the output of the system, the other frequency generating arrangement is controlled to lock to a next predetermined frequency of the predetermined frequency sequence, and to control the multiplexer unit pass the output of the other frequency generating arrangement to the system output after a predetermined time period; and repeating the controlling step in order to generate the predetermined frequency sequence. | 06-09-2011 |
20110150041 | MOBILE COMMUNICATION METHOD AND EXCHANGE STATION - A mobile communication method according to the present invention includes step of causing a mobile station | 06-23-2011 |
20110170574 | METHOD FOR THE SECURE TRANSMISSION OF INFORMATION USING MULTIPLE LPD AND LPI SECONDARY CARRIERS UNDER A PRIMARY CARRIER WITH RELATIVE CARRIER OFFSET - A method of reducing probability of detection and interception of a sub-carrier signal comprising encoding, using an encoder, information that is to be transmitted via the sub-carrier signal, modulating, using a modulator, the encoded information such that a modulated sub-carrier signal results, spreading, using a spreader, the modulated sub-carrier signal such that a spread sub-carrier signal results, and transmitting the spread sub-carrier signal at a frequency that is dynamic relative to an original carrier signal having a static frequency. | 07-14-2011 |
20110176580 | TECHNIQUES FOR ENABLING COMPATIBILITY OF ULTRA WIDEBAND DEVICES | 07-21-2011 |
20110182326 | EMBEDDED RF ENVIRONMENTAL EVALUATION TOOL TO GAUGE RF TRANSCEIVERS PERFORMANCE NEED - The present technology relates to protocols relative to utility meters associated with an open operational framework. More particularly, the present subject matter relates to protocol subject matter for advanced metering infrastructure, adaptable to various international standards, while economically supporting a 2-way mesh network solution in a wireless environment, such as for operating in a residential electricity meter field. The present subject matter supports meters within an ANSI standard C12.22/C12.19 system while economically supporting a 2-way mesh network solution in a wireless environment, such as for operating in a residential electricity meter field, all to permit cell-based adaptive insertion of C12.22 meters within an open framework. Cell isolation is provided through quasi-orthogonal sequences in a frequency hopping network. Additional features relate to apparatus and methodology subject matters related to Embedded RF environmental evaluation tool features to gauge the performance need of RF transceivers. | 07-28-2011 |
20110182327 | RADIO TRANSMISSION DEVICE AND RADIO TRANSMISSION METHOD - Provided are a radio transmission device and a radio transmission method which can reduce the transmission packet collision generation ratio even when a reception of scheduling information has failed in the retransmission method using a combination of the adaptive HARQ and the non-adaptive HARQ. In ST | 07-28-2011 |
20110188542 | COMMUNICATION APPARATUS AND METHOD - A communication apparatus and method for operating a communication apparatus are provided. The communication apparatus is configured to determine whether a sub-frequency band causing interference is present among sub-frequency bands included in a reception frequency band group, and to send to another communication apparatus an interference avoidance request signal which requests the other communication apparatus to transmit signals by use of remaining sub-frequency bands except the sub-frequency band causing interference, leading to simpler and more efficient interference avoidance. | 08-04-2011 |
20110206087 | CELL ISOLATION THROUGH QUASI-ORTHOGONAL SEQUENCES IN A FREQUENCY HOPPING NETWORK - The present technology relates to protocols relative to utility meters associated with an open operational framework. More particularly, the present subject matter relates to protocol subject matter for advanced metering infrastructure, adaptable to various international standards, while economically supporting a 2-way mesh network solution in a wireless environment, such as for operating in a residential electricity meter field. The present subject matter supports meters within an ANSI standard C12.22/C12.19 system while economically supporting a 2-way mesh network solution in a wireless environment, such as for operating in a residential electricity meter field, all to permit cell-based adaptive insertion of C12.22 meters within an open framework. Cell isolation is provided through methodology and apparatus subject matter relating to quasi-orthogonal sequences in a frequency hopping network. | 08-25-2011 |
20110222587 | Power efficient FHSS base-band hardware architecture - The present invention provides a power efficient FHSS (Frequency Hopping Spreading Spectrum) base-band hardware architecture, and more particularly to a combinational design to reduce the system jitter of a frequency hopping communication system and bring system synchronization to higher level of performance, thereby achieving better immunity to faulty access header recognition, data corruption by sending and tracking the package header of each package more precise, therefore reduces the uncertain window of access header check. With above-mentioned features, this invention has less error packets resend over wireless link, and maintain same system functionality using MCU clocked at relative lower frequency. Hence it becomes possible to reduce the area of the silicon implementation, extend standby time when used in mobile device, and save power consumption system wide. Moreover, the present invention is applicable for use in various types of base-band hardware communication architectures or similar architectures. | 09-15-2011 |
20110235682 | Method and apparatus for determining reference signals in mobile communication system - Embodiments of the present invention provide a method and an apparatus for determining reference signals. A User Equipment (UE) obtains group hopping information and/or sequence hopping information of a UE-specific reference signal from cell-specific system information broadcasted by an eNB. The UE receives UE-specific control information transmitted by the eNB to the UE. The UE generates a UE-specific reference signal of a first slot according to the group hopping information and/or sequence hopping information of the broadcasted cell-specific reference signal. If the UE-specific control information indicates that group hopping and/or sequence hopping of UE-specific reference signals is disabled, the UE generates a UE-specific reference signal of a second slot in a same frame with the first slot according to the UE-specific reference signal of the first slot. The UE is able to determine the reference signals when multiple UEs share physical resource blocks. | 09-29-2011 |
20110243189 | Frequency alignment for narrow band radios - A communications protocol that allows the operating frequencies of multiple radios to be aligned, allowing the radios to use a narrower bandwidth than would otherwise be possible. | 10-06-2011 |
20110261861 | APPARATUS AND METHOD FOR AVOIDING INTERFERENCE NOISE IN FHSS SYSTEM - Disclosed are an apparatus and a method for reducing the effect of an interference signal present in the same channel in a frequency hopping spread spectrum (FHSS) system. The apparatus of the present invention comprises: a group classification part for classifying the entire channels of the FHSS system into a certain number of groups according to the channel bandwidth unit of an FS interference signal; an FS interference elimination part for eliminating a group in which an FS interference exists from said certain number of groups based on the packet error rate (PER) of said certain number of groups that have been classified; and an FD interference avoidance part for avoiding interference by transmitting a packet only if an interference signal does not exist by estimating the existence of said FD interference signal based on a time sequence with respect to the channel to be used for the next frequency hopping (FH), when transmitting a signal by utilizing FH using channels wherein said FS interference signal does not exist. Thus, the present invention enables further shortening of the time taken for FS interference avoidance, and efficient avoidance of FD interference, thereby being capable of obtaining enhanced transmission performance. | 10-27-2011 |
20110292971 | COMMUNICATIONS METHOD EMPLOYING ORTHONORMAL TIME-FREQUENCY SHIFTING AND SPECTRAL SHAPING - A wireless combination time, frequency and spectral shaping communications method that transmits data in convolution unit matrices (data frames) of N×N (N | 12-01-2011 |
20110310930 | SPECTRAL REUSE TRANSCEIVER-BASED AGGREGATION OF DISJOINT, RELATIVELY NARROW BANDWIDTH (VOICE) CHANNEL SEGMENTS OF RADIO SPECTRUM FOR WIDEBAND RF COMMUNICATION APPLICATIONS - A bandwidth usage control methodology uses the clear channel detection and frequency agile functionality of a spectral reuse transceiver to effectively ‘aggregate’ disjoint user channels into an overall bandwidth, the spectral extent of which is at least sufficient to meet a high bandwidth requirement (such as, but not limited to the transmission of data/video), that cannot be realized by a conventional, single channel radio. | 12-22-2011 |
20110317742 | BASE STATION - A cellular radio communication system includes a first mobile terminal, a base station that performs radio communication with first mobile terminals, a second mobile terminal, and a second base station that performs radio communication with second mobile terminals. In the downlink communication, the base station selects a high data rate mode when the radio interference from the base station to the second mobile terminals that are located close to an edge of a communication area of the second base station is small. The base station selects an interference mitigation mode in the downlink communication when the radio interference from the base station to the second mobile terminals that are located close to the edge of the communication area of the second base station is large. Thus, inter-cell interference control can be performed in collaboration with base stations in the radio communication system without having communication interface between the base stations. | 12-29-2011 |
20120069869 | OPERATING METHOD FOR A WPAN DEVICE - A method of operating a device capable of periodically hopping a predetermined interval using a channel hopping sequence in order to improve low radio frequency (RF) reliability caused by single frequency based channel access. | 03-22-2012 |
20120076173 | Method and Device for Implementation of Adaptive Frequency Hopping by Power Spectral Density - A wireless communication device is disclosed. The wireless communication device includes a frequency hopping communication circuit, a power spectral density circuit and a control circuit. The frequency hopping communication circuit includes a channel map. The frequency hopping communication circuit selects one of channel in a channel map to connect to another frequency hopping communication circuit according to the channel map. The power spectral density circuit for generating a power spectral density signal by measuring spectrums on all channels connected to the frequency hopping communication circuit. The control circuit receives the power spectral density and output statistical distribution data to the frequency hopping communication circuit. The frequency hopping communication circuit updates the channel map according to the statistical distribution data. | 03-29-2012 |
20120155510 | Method And System For Message Transmission And Reception - Wireless devices may contain multiple radio transceivers, each conforming to different communication protocols. A first transceiver conforming to a first communication protocol in a first wireless device may be able to receive, detect, and/or decode messages transmitted by a second transceiver in a second wireless device conforming to a second communication protocol. The first transceiver may communicate received, detected, and/or decoded information to a different transceiver in the same first wireless device, thus enabling the collocated transceivers to work in concert efficiently. A wideband transceiver using a set of multiple sub-channels in parallel may receive, detect, and/or decode messages transmitted by a narrowband transceiver using a set of multiple channels serially, thereby reducing scan time and power consumption. | 06-21-2012 |
20120224606 | DYNAMIC MANAGEMENT OF SIGNAL ROUTING CAPACITY FOR SATELLITES USING A DIGITAL TRANSPARENT PROCESSOR HAVING RAPID RECONFIGURATION - The present invention relates to a device for managing signal routing on board a satellite, and use of “agile” digital transparent processors. The device decorrelates the spreading band of the uplink to said satellite from the instantaneous useful band of each signal, used for routing on board the satellite and on the downlink. For a given protection dictating the spreading width of the uplink signals, the device makes it possible to optimize connectivity, i.e. the number of routes through said satellite, as well as the total capacity of the satellite by means of individualized control of the gain of each route. The routing band is limited to the instantaneous useful communication band and is not extended to the spreading band of the uplink. The band used in the downlink by each signal can also be limited to the instantaneous useful band or possibly widened by a new frequency spread. | 09-06-2012 |
20120307869 | Frequency Hopping in License-Exempt/Shared Bands - RRC signaling is used to configure a user device for N secondary cells SCells on license-exempt channels w | 12-06-2012 |
20120320947 | METHOD AND APPARATUS FOR ALLOCATING A BEACON SIGNAL IN A WIRELESS COMMUNICATIONS NETWORK - A method and apparatus for transmitting beacon signals in a wireless communications network. For a given cell site, a single frequency may be used for the beacon signal by assigning different beacon signal time slots to different sectors of the cell site. During one time slot, the beacon signal is transmitted to one of the sectors, and during another one of the time slots, the beacon signal is transmitted to a different one of the sectors. Because a single frequency can be used for all of the sectors of a cell site, more frequencies are available for other purposes, such as for user traffic, for example. The invention improves spectral efficiency, reduces adjacent channel interference and co-channel interference and allows power consumption to be controlled. | 12-20-2012 |
20130022083 | SUB-SLOTTING TO IMPROVE PACKET SUCCESS RATE IN CARRIER SENSE MULTIPLE ACCESS NETWORKS - In one embodiment, a communication device in a frequency hopping communication network determines an intention to forward a first packet in a particular timeslot of a frequency hopping sequence. As such, the device scans in receive mode for an initial portion of the particular timeslot on a particular frequency known to neighbors of the communication device for reaching the communication device. In response to determining that the communication device is receiving a second packet during the initial portion, the device remains in receive mode to receive a remainder of the second packet. Conversely, in response to not receiving the second packet during the initial portion, the device proceeds to transmit the first packet during a remainder of the particular timeslot. | 01-24-2013 |
20130028293 | TIME-SHARED AND CONCURRENT MULTI-PROTOCOL BEACON TRANSMISSION DESIGN - A base station in a cellular wireless communications system uses one or more control algorithms to control a transmission pattern of a 1xRTT or DO discovery beacon. The transmission pattern enables access terminals using any one of multiple wake-up periods and wake-up offsets to discover all macrocell frequencies in a finite amount of time. In addition, for base stations allocating a single transmit chain to both 1xRTT and DO beacons, the transmission pattern enables a definite maximum discovery time for both 1xRTT and DO beacons for all access terminals entering the base station coverage. | 01-31-2013 |
20130100986 | METHOD OF ADAPTING A WIRELESS SYSTEM FOR USE IN A GEOGRAPHIC LOCATION - A wireless communication system comprises a first computing device and a second computing device, wherein the first computing device and the second computing device communicate over a wireless channel that is selected based in part on a geographic location of at least one of the first computing device and the second computing device. The wireless channel that is selected provides long range communications, on the order of 60 miles and more. The computing devices may be a robot controller and a controlled robot, or they may be wireless router and a computing device configured with a wireless transceiver. | 04-25-2013 |
20130163639 | System for Modifying the Carrier Frequency - A system and method for modifying the carrier frequency of first and second signals associated with first and second sequences, respectively, of consecutive time intervals, comprises: first means determining two carrier frequencies respectively associated with each of the two signals based on one time interval or at least two consecutive and continuous time intervals, said time interval(s) belonging to a sequence of consecutive time intervals of known duration; and second means determining a first time interval or at least two first consecutive time intervals belonging to the first sequence, based on a second time interval belonging to the second sequence, by establishing a temporal correspondence between each end of said time interval of said second sequence and an interval of said first sequence including this end. The first means determines said carrier frequencies based on one time interval or at least two consecutive time intervals, belonging to said first sequence. | 06-27-2013 |
20130177043 | BLUETOOTH.RTM. AND WIRELESS LAN COEXISTENCE - A method and system for Bluetooth® and Wireless LAN coexistence may include controlling wireless local area network (WLAN) communication and Bluetooth® communication in a coexistence system that handles at least a WLAN communication protocol and a Bluetooth® communication protocol based on time division multiplexing (TDM) and adaptive frequency hopping (AFH). Switching may occur between the WLAN communication and the Bluetooth® communication based on the TDM and the AFH. In one embodiment of the invention, the switching may occur adaptively. Notwithstanding, in instances where it may be determined that AFH is disabled, switching to TDM may occur. WLAN communication and/or Bluetooth® communication may be disabled or enabled based on a state of at the WLAN communication and/or the Bluetooth® communication. Use of the AFH may be enabled or disabled based on a link status of the WLAN communication and/or the Bluetooth® communication. | 07-11-2013 |
20130235905 | GATEWAY WIRELESS COMMUNICATION INSTRUMENT, WIRELESS COMMUNICATION SYSTEM, AND COMMUNICATION CONTROL METHOD - A period is defined to execute the sequences (processes) of communication data acquisition, measuring communication quality, communication quality data acquisition, and channel change. Processing is controlled to execute each process within a time limit set for each process and execute all processes in one cycle. This avoids that a delayed sequence influences and delays other sequences and can suppress delays. If processing fails to finish a sequence, it will resume the same sequence in the next cycle. For communication stations sharing timeslots, there are provided offset periods differing in length before the start of carrier sense in the timeslots for these stations. Consequently, even under a condition in which packet collision may occur, the collision of packets can be avoided by detecting a packet sent to another station by carrier sense. Moreover, by controlling sending priority of packets in the send queue of the gateway, sending delay can be avoided. | 09-12-2013 |
20130301681 | Frequency Hopping for Dynamic Spectrum Access - Described is a technology by which available radio frequency channels are switched/varied by communicating devices according to a frequency hopping pattern. The pattern may be a pseudorandom pattern, which may be weighted based at least in part on channel interference data. As also described herein, interference-related data may be used in a decoding scheme. | 11-14-2013 |
20140003467 | Frequency Hopping Scheme for OFDMA System | 01-02-2014 |
20140023118 | Approach For Managing The Use Of Communications Channels Based On Performance - An approach for selecting sets of communications channels involves determining the performance of communications channels. A set of channels is selected based on the results of performance testing and specified criteria. The participant generates data that identifies the selected set of channels and provides that data to other participants of the communications network. The participants communicate over the set of channels, such as by using a frequency hopping protocol. When a specified time expires or monitoring of the performance of the channel set identifies poor performance of the set of channels, the participant selects another set of channels for use in communications based on additional performance testing. By selecting channels based on the initial performance testing and performance monitoring, the communications network adaptively avoids channels with poor performance. | 01-23-2014 |
20140050249 | CONSTRAINED HOPPING IN WIRELESS COMMUNICATION SYSTEMS - Embodiments described provide for resource allocation for a transmission to a wireless device. The frequency band is partitioned into at least two contiguous subbands. A determination is made whether it is desirable to transmit in a single subband or in more than one subband. The transmission is assigned to occur in either the single subband or to operate in more than one subband. If the transmission is restricted to one subband, the hop pattern is also restricted to subcarriers within the particular subband. | 02-20-2014 |
20140334527 | METHOD AND SYSTEM FOR ALLOCATING COMMUNICATION RESOURCES - The present invention relates to a method for allocating communication resources in a multi-user cellular communication system, wherein communication resources are divided in time periods and frequency sub-bands, wherein part of the communication resources are used for frequency-localized communication channels, and part of the communication resources are used for frequency distributed channels The method further comprises the steps of: classifying part of the frequency sub-bands as frequency sub-bands carrying frequency-distributed channels, classifying the remaining part of the frequency sub-bands as frequency sub-bands carrying frequency-localized channels. The present invention also relates to a system, a transmitter and a communication system. | 11-13-2014 |
20150303990 | WIRELESS INTERFERENCE SCANNING METHOD AND DEVICE FOR ADAPTIVE FREQUENCY HOPPING - The present disclosure provides a wireless interference scanning method and device for adaptive frequency hopping. The wireless interference scanning method comprise detecting the overall signal magnitude over a wide-band; determining whether the overall signal magnitude over the wide-band is larger than a threshold; sequentially detecting a plurality of channels in the wide-band to determine whether there is an interference signal in the channels when the overall signal magnitude over the wide-band is larger than the threshold; and redetecting the overall signal magnitude over the wide-band for determining whether the overall signal magnitude over the wide-band is larger than the threshold when the overall signal magnitude over the wide-band is not larger than the threshold. | 10-22-2015 |
20150326274 | WIRELESS COMMUNICATION WITH PROBING BANDWITH - A system embodiment includes a first device and a second device configured to communicate over a selected wireless communication channel selected from a band of channels or over a selected set of channels used in an adaptive frequency hopping scheme. The first device is configured to transmit a probe signal that has a plurality of frequencies contained within the band of channels, and the second device is configured to determine a signal strength of the probe signal for each of a plurality of potential communication channels within the band of channels. The first and second devices configured to switch to another wireless communication channel based at least in part on the signal strength of the probe signal for each of a plurality of potential wireless communication channels. | 11-12-2015 |
20150326275 | Frequency Hopping Sequence Generation - Techniques for frequency-hopping sequence-generation are described herein. In one example, a sequence of pseudo random numbers may be used to generate a scrambling sequence. The scrambling sequence may be used to map an unscrambled sequence of channels into a scrambled sequence of channels. Channel-repeats may be detected in the scrambled sequence of channels and resolved. Channel whitening may be performed to reduce channel overuse resulting from the channel-repeat resolutions. The scrambled sequence of channels may be provided to a radio to enable the radio to tune to the channels indicated by the scrambled sequence of channels. | 11-12-2015 |
20150373626 | METHOD AND APPARATUS FOR PERFORMING DATA TRANSMISSION IN WIRELESS COMMUNICATION SYSTEM - A method for and apparatus for performing data transmission in a wireless communication system is provided. A wireless device checks a configuration including virtual cell groups, the virtual cell group each including two more serving cells which are shared an identical virtual cell identification (ID), checks discovery signals scrambled with the identical virtual cell ID and system information including a physical random access channel (PRACH) configuration, from master cells each of the virtual cell groups. Thus, the UE performs data transmission seamlessly because serving cells are belonged to the identical virtual cell ID even if a serving cell is switched from one to another in view of a physical cell. | 12-24-2015 |
20160050679 | MANAGING INTERFERENCE BETWEEN COLLOCATED RADIOS - A device implementing a system for managing interference between collocated radios may include a first radio module, a collocated second radio module, and a host processor. The first radio module may be configured to generate a collocated radio tolerance indicator that indicates a tolerance of the first radio module to interference caused by the collocated second radio module when the collocated second radio module is transmitting, and provide the collocated radio tolerance indicator to a host processor when a second collocated radio module is transmitting. The host processor may be configured to control the second radio module based at least in part on the collocated radio tolerance indicator. | 02-18-2016 |
20160099747 | ADD-ON APPARATUS FOR CHANNEL COMPENSATION OF FREQUENCY DIVERSITY COMMUNICATIONS AND METHODS USEFUL IN CONJUNCTION THEREWITH - A communication system, typically wireless and comprising at least one wireless (say) communication network node having a capacity for communicating with at least one additional wireless (say) communication network node at a given center frequency; and at least one external frequency converter, external to the node, operative to cause at least one wireless (say) communication network node, from outside said node, to communicate with at least one additional wireless (say) communication network node, at least on occasion, according to a given e.g. wireless communication protocol, at at least one converted center frequency which differs from the given center frequency, wherein a Channel Compensation Signal (CCS) is employed. | 04-07-2016 |
20160204827 | NETWORK DEVICE WITH FREQUENCY HOPPING SEQUENCES FOR ALL CHANNEL-NUMBERS FOR CHANNEL HOPPING WITH BLACKLISTING | 07-14-2016 |
20160254839 | Multicarrier Communication System Employing Explicit Frequency Hopping | 09-01-2016 |
20180026675 | METHOD FOR MANAGING INTERFERENCE | 01-25-2018 |
20190149189 | IMPROVED DATA TRANSMISSION/RECEPTION BY FREQUENCY HOPPING | 05-16-2019 |
20190149190 | LOGICAL CHANNEL HOPPING SEQUENCE DESIGN | 05-16-2019 |