| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 455020000 | With frequency conversion | 24 |
| 20090104873 | FULLY INTEGRATED COMPACT CROSS-COUPLED LOW NOISE AMPLIFIER - Fully integrated compact cross-coupled low noise amplifier. A circuitry implementation that includes two pairs of metal oxide semiconductor field-effect transistors (MOSFETs) (either N-type of P-type) operates as an LNA, which can be used within any of a wide variety of communication devices. A majority of the elements are integrated within the design and need not be implemented off-chip, and this can provide for a reduction in area required by the circuitry. A differential 100Ω input impedance is provided by this design. A higher than typical power supply voltage can be employed (if desired) to accommodate one possible implementation that includes two parallel implemented resistors to ground. | 04-23-2009 |
| 20090111377 | FREQUENCY CONVERTER AND RECEIVER AND TRANSMITTER USING THE SAME - A frequency converter includes a voltage-current converter circuit which generates a positive-phase input current signal and a negative-phase input current signal, a switching circuit which switches between the positive-phase input current signal and the negative-phase input current signal according to a positive-phase local oscillator signal and a negative-phase local oscillator signal to generate a positive-phase output current signal and a negative-phase output current signal, an amplifier circuit which current-voltage converts and amplifies the positive-phase output current signal and negative-phase output current signal to generate a positive-phase output voltage signal and a negative-phase output voltage signal, and a plurality of CR circuits which are inserted at least either between the voltage-current converter circuit and the switching circuit or between the switching circuit and the amplifier circuit and each of which includes at least one capacitor through which high-frequency components pass and at least one resistance through which low-frequency noise components pass. | 04-30-2009 |
| 20090197527 | SERVICE RELAY DEVICE, SERVICE RECEIVER FOR RECEIVING THE RELAYED SERVICE SIGNAL, AND METHODS THEREOF - A service relay device is provided. The service relay device includes a receiving unit which receives a service signal, and a service processing unit which changes information regarding an order of changing frequency channels included in the received service signal, using replacement frequency channels, and broadcasts the service signal. The service processing unit includes a detecting unit which detects the information regarding the order of changing frequency channels, a storage unit which stores information regarding replacement frequency channels, an information processing unit which replaces the information regarding the order of changing frequency channels, using the replacement frequency channels stored in the storage unit, and a relay unit which broadcasts a service signal. As a result, service signals are provided stably even in the fringe area. | 08-06-2009 |
| 20090203311 | RADIO WAVE RECEPTION DEVICE, RADIO WAVE CLOCK, AND REPEATER - A received low-frequency standard radio wave, which is an amplitude modulation signal, is converted to an intermediate frequency signal Sa, and is output to a detection circuit and an AGC circuit. The detection circuit and AGC circuit generates an RF control signal Sf | 08-13-2009 |
| 20090209201 | APPARATUS AND METHOD OF ON-CHANNEL REPEATER - Provided are an on-channel repeater and a method thereof. The on-channel repeater can extract reception channel information from signals transmitted from a main transmitter or another repeater, compensate for channel distortion caused on a transmission channel by inversely reflecting the extracted reception channel information to the received signals, and transmit the channel-distortion compensated signals through the same channel as a reception channel, and a method thereof. The on-channel repeater includes: a receiver for receiving RF signals transmitted from outside; a down-converter for down-converting the received RF signals into signals of a desired band; a channel-estimator for estimating an inverse value of a reception channel based on the down-converted signals; an adaptation filter for compensating for channel distortion by using a filter having the inverse value of the estimated reception channel; an up-converter for up-converting the channel distortion-compensated signals into RF signals; and a transmitter for transmitting the up-converted RF signals. | 08-20-2009 |
| 20090247076 | RADIO FREQUENCY SIGNAL DISTRIBUTION USING DATA CABLE SYSTEM - A system for distributing radio frequency signals using a data cable system includes a method and components that receive a radio frequency (RF) signal, identify at least one unoccupied channel on the data cable system, convert the RF signal to the frequency associated with an unoccupied channel as a converted signal, insert the converted signal into the cable, extract the converted signal from the cable as an extracted signal, convert the extracted signal to a transmission frequency as a transmission signal, and transmit the transmission signal at the transmission frequency. | 10-01-2009 |
| 20090286474 | RADIO REPEATER FOR MOBILE COMMUNICATION SYSTEM AND REPEATING METHOD USING THE SAME - Disclosed herein is a radio frequency (RF) repeater comprising an analog signal processing unit and a digital signal processing unit, wherein the analog signal processing unit includes a filtering unit; an amplification unit on receiving side; a frequency conversion unit on receiving side; a frequency conversion unit on transmitting side; and an amplification unit on transmitting side, and the digital signal processing unit includes a receiving signal detection unit; the automatic gain control unit; a feedback signal detection unit; a feedback signal combining unit; a feedback signal elimination unit; an automatic delay control unit; and the control unit. | 11-19-2009 |
| 20100056044 | RADIO FREQUENCY (RF) TRANSCEIVER - Systems and methods are disclosed for transmitting and receiving RF signals. An exemplary RF transceiver includes a signal generator, a frequency multiplier circuit, a receiver circuit, a transmitter circuit, and a switching device. The signal generator is configured to output a first signal and a second signal. The first signal comprises a local oscillator signal, and a frequency of the second signal is derived from a frequency of the first signal. The frequency multiplier circuit is configured to upconvert the output of the signal generator by frequency multiplication. The receiver circuit is configured to process a received signal using an upconverted first signal, and the transmitter circuit is configured to provide an upconverted second signal to a transmitter channel. The switching device is configured to provide the upconverted first signal to the receiver circuit and the upconverted second signal to the transmitter circuit. | 03-04-2010 |
| 20100221998 | ON-CHANNEL REPEATER AND ON-CHANNEL REPEATING METHOD - Provided are an on-channel repeater and method for increasing output of the on-channel repeater by removing feed-back signals caused by low isolation of transmission/reception antennas. The on-channel repeater includes: a receiver for receiving RF signals and converting the RF signals into baseband signals; a subtractor for subtracting replicas of feedback signals from the received signal; an inverse channel estimator for estimating inverse of a reception channel and generating a filter tab coefficients; a first adaptive filter for compensating for channel distortion of the subtracted signal; a transmitter for converting the signals whose channel distortion is compensated into an RF signal and performing radio transmission; a down-converter for down-converting the RF signal converted by the transmitter into the baseband signal; and a replica generator for calculating replicas and feeding back the replicas to the subtractor. The present invention is applied to the on-channel repeater. | 09-02-2010 |
| 20100227548 | REPEATER INTERFACE UNIT AND SIGNAL CONVERTING METHOD THEREOF - A repeater interface unit for a TX path includes a first reference signal generator for generating a reference signal for an intermediate band conversion; a first mixer for mixing an input signal with the reference signal to generate an intermediate band signal; a second reference signal generator for generating a reference signal for output conversion with one of a plurality of frequencies; a second PLL circuit for stabilizing the reference signal for output conversion; a second mixer for mixing the intermediate band signal generated by the second mixer with the reference signal for output conversion to generate an output signal; and a second filtering means for filtering the output signal of the second mixer. | 09-09-2010 |
| 20110159809 | ACTIVE ANTENNA ARRAY WITH A SINGLE COMMON CLOCK AND A METHOD FOR RELAYING A PLURALITY OF RADIO SIGNALS - An active antenna system for a mobile communications network and a method for relaying radio signal in the mobile communications network is disclosed. The active antenna system comprises a plurality of antenna elements for relaying radio signals at a first frequency band. The plurality of antenna elements is connected to a plurality of signal paths. A plurality of signal inputs for inputting radio signals at a second frequency band is connected to the plurality of signal paths. A plurality of first mixers in the plurality of the signal paths converts the frequency of the radio signals between the first frequency band and the second frequency band. A plurality of first local oscillators is connected to the plurality of first mixers and a single reference oscillator can be connected through a plurality of first dispersion elements to different ones of the plurality of local oscillators through a plurality of first oscillator signal paths and to a digital signal processor. | 06-30-2011 |
| 20120156989 | Frequency Shifting Repeater - Aspects of a method and system for frequency control in a frequency shifting repeater are provided. In this regard, a reference frequency may be divided to generate a first pair of local oscillator (LO) signals, the first pair of LO signals may be divided to generate a second pair of LO signals. The two pairs of LO signals may be utilized to frequency shift a received signal for repeating the signal on a different frequency. The frequency shifted signal may be generated by down-converting the received signal utilizing the first pair of LO signals, up-converting the down-converted signal utilizing the second pair of LO signals, and combining the resulting up-converted signals. The reference frequency may be divided by a first scaling factor to generate the first pair of LO signal which, in turn, may be divided by a second scaling factor to generate the second pair of LO signals. | 06-21-2012 |
| 20120220215 | MICROWAVE RELAY RECEIVING METHOD AND APPARATUS, MICROWAVE RELAY TRANSMITTING METHOD AND APPARATUS, AND MICROWAVE RELAY NODE - An embodiment of the present invention discloses a microwave relay receiving method and apparatus, a microwave relay transmitting method and apparatus, and a microwave relay node. The embodiment of the present invention relates to the field of communications technologies and is invented to enable free scheduling of microwave signals at low costs. The microwave relay receiving method includes: receiving a microwave signal; separating the microwave signal to obtain service information at an intermediate frequency band and control information at a low frequency band and sending the separated service information to a switch matrix; and sending the control information to the switch matrix so that a corresponding switch in the switch matrix is turned on and the service information is transmitted by the turned on switch. | 08-30-2012 |
| 20130244573 | Frequency Control in a Frequency Shifting Repeater - Aspects of a method and system for frequency control in a frequency shifting repeater are provided. In this regard, a reference frequency may be divided to generate a first pair of local oscillator (LO) signals, the first pair of LO signals may be divided to generate a second pair of LO signals. The two pairs of LO signals may be utilized to frequency shift a received signal for repeating the signal on a different frequency. The frequency shifted signal may be generated by down-converting the received signal utilizing the first pair of LO signals, up-converting the down-converted signal utilizing the second pair of LO signals, and combining the resulting up-converted signals. The reference frequency may be divided by a first scaling factor to generate the first pair of LO signal which, in turn, may be divided by a second scaling factor to generate the second pair of LO signals. | 09-19-2013 |
| 20130267165 | ACTIVE ANTENNA ARRAY WITH A SINGLE COMMON CLOCK AND A METHOD FOR RELAYING A PLURALITY OF RADIO SIGNALS - An active antenna system for a mobile communications network and a method for relaying radio signal in the mobile communications network is disclosed. The active antenna system comprises a plurality of antenna elements for relaying radio signals at a first frequency band. The antenna elements are connected to a plurality of signal paths. A plurality of signal inputs for inputting radio signals at a second frequency band is connected to the plurality of signal paths. A plurality of mixers in the signal paths converts the frequency of the radio signals between the first frequency band and the second frequency band. A plurality of local oscillators is connected to the mixers and a single reference oscillator can be connected through a plurality of first dispersion elements to different ones of the plurality of local oscillators through a plurality of first oscillator signal paths and to a digital signal processor. | 10-10-2013 |
| 20130309962 | METHOD AND APPARATUS FOR IN-BUILDING COMMUNICATIONS - A system for repeating radio signals to the outside of a structure, from transmitters operating within a structure that normally prevents radio transmissions from propagating out of the structure. A system for repeating radio signals to the inside of a structure, from transmitters operating outside a structure that normally prevents radio transmissions from propagating into the structure. | 11-21-2013 |
| 20140057556 | APPARATUS AND METHOD FOR WIRELESS RELAYING - An apparatus for wireless relaying comprises: a transmission unit for generating a wireless signal; an amplification unit for amplifying and outputting the wireless signal; a conversion unit for converting the wireless signal into a digital signal; and an adjustment unit for adjusting the amplification ratio of the amplifying unit so that the difference between an output level value of the digital signal and a predetermined target power is lower than a predetermined numerical value. | 02-27-2014 |
| 20150365111 | WIDEBAND AND MULTI-BAND FREQUENCY UP CONVERTER - Disclosed is a wideband and multi-band frequency up converter used in a satellite earth station. The converter includes a first mixer configured to mix an intermediate frequency (IF) signal and a first local signal, and generate an IF′ signal; a narrow band filter configured to filter the IF signal; a first local oscillator configured to generate a first local signal so that the IF′ signal passes the narrow band filter; a second local oscillator configured to generate a second local signal needed to convert the IF′ signal into a desired frequency (RF) band; a second mixer configured to mix the IF′ signal filtered in the narrow band filter and the second local signal, and generate an RF signal; a wideband filter configured to filter the generated RF signal; and a control unit configured to vary a frequency of the first local signal. | 12-17-2015 |
| 455021000 | With demodulator | 2 |
| 20110207399 | CYCLIC PREFIX SCHEMES - Methods and systems are proposed for transmitting data from a source ( | 08-25-2011 |
| 20140065951 | APPARATUS AND METHOD FOR PROVIDING A RELAYED WIRELESS COMMUNICATION PATH BETWEEN CELLS - A first apparatus at a first base station changes directivity of a first antenna connected in a direction of a cell of a second base station adjacent to the first base station, where directivity of some antennas of a second apparatus at the second base station is changed to a cell of the first base station and some radio resources are assigned to wireless communication with the first apparatus. The first apparatus receives a signal of a first frequency from the second apparatus via the first antenna, converts the received signal into a signal of a second frequency, demodulates the signal of the second frequency, corrects a delay of the demodulated signal caused by propagation of a radio wave and frequency conversion, and modulates the corrected signal to a signal of a third frequency which is transmitted to a cell of the first base station via a second antenna. | 03-06-2014 |
| 455022000 | Plural conversion stages | 4 |
| 20090088074 | ENCLOSED SPACE COMMUNICATION SYSTEMS AND RELATED METHODS - Systems and methods for communication in enclosed areas. Implementations of a method may include sending a first high frequency (HF) signal using a first HF radio, receiving the first HF signal with a first medium frequency (MF) repeater, converting the first HF signal to an MF signal using the first MF repeater, and sending the MF signal to one or more second MF repeaters located in an enclosed space. The method may include receiving the MF signal with the one or more second MF repeaters, converting the MF signal to a second HF signal using the one or more second MF repeaters, and sending the second HF signal to a second HF radio. Implementations of radio communication systems may utilize MF repeaters with MF antennas which may be omnidirectional. | 04-02-2009 |
| 20110105018 | HARMONIC REJECTION MIXER - A harmonic rejection mixer for carrying out a frequency translation of a mixer input signal having a mixer input frequency, the mixer including an up-conversion mixer for generating an intermediate signal by multiplying the mixer input signal with a first local oscillation signal having a first local oscillation frequency, and a down-conversion mixer for generating a mixer output signal by multiplying the intermediate signal with a second local oscillation signal having a second local oscillation frequency. The first local oscillation frequency and the second local oscillation frequency are greater than the mixer input frequency. The first local oscillation signal is an l-time oversampled sine wave and the second local oscillation signal is an m-time oversampled sine wave. | 05-05-2011 |
| 20120064824 | APPARATUS FOR MIXING FREQUENCY - A frequency mixing apparatus includes a local oscillator, a signal distributor, a first frequency mixer and a second frequency mixer and a combiner. The signal distributor divides a signal generated from the local oscillator into two signals having a phase difference and outputs the two signals. The first frequency mixer has a first input port through which one of the two signals outputted through the signal distributor is inputted and a second input port connected to an RF signal. The a second frequency mixer has a first input port through which one of the two signals outputted through the signal distributor and a second input port is connected to a termination signal. The combiner combines signals respectively outputted from the first and second frequency mixers. | 03-15-2012 |
| 20140378047 | SYSTEMS AND METHODS FOR A FRONTHAUL NETWORK - Various embodiments provide for systems, methods, or apparatuses that provide a fronthaul architecture that facilitates high fidelity and low latency communication between a radio processing unit, such as a baseband unit (BBU), which may be located a central office (CO), and a remote transceiver, which may comprise a remote radio head (RRH) or a remote radio unit (RRU), which may be located at remote cell site. | 12-25-2014 |
