| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 455024000 | Transmitter/receiver feedback compensation | 16 |
| 20080254743 | Wireless Communication System - In a wireless repeater apparatus communicating with wireless communication apparatuses, a switching circuit transfers a data packet received through any one of antennas to any one of antennas for transmission. A correspondence table memory stores a correspondence table that includes relations of an identifier of each antenna between an identifier of each wireless communication apparatus. A wireless repeater apparatus control circuit controls transfer of the data packet by the switching circuit based on the correspondence table. | 10-16-2008 |
| 20080274692 | Scheduling in a Wireless Multi-Hop Relay Network - A wireless relaying network having a number of network nodes including a designated originating node, at least one relaying node, and at least two receiving nodes. The designated originating node transmits a pilot signal, and the relaying node(s) receives and forwards the pilot signal to the receiving nodes, each of which measures channel quality based on the received pilot signal. At least part of the receiving nodes feed information on the measured channel quality all the way back to the designated originating node, and the originating node then schedules data for transmission to at least one selected node of the receiving nodes based on the received channel quality information. Subsequently, the designated originating node transmits data to the selected receiving node(s) via the same relaying node(s) that forwarded the pilot signal. In this way, multi-user diversity scheduling is introduced to relaying networks that provides significant data rate enhancements. | 11-06-2008 |
| 20080293360 | On frequency repeater with AGC stability determination - An on frequency repeater for wireless networks with feedback oscillation detection is disclosed. The on frequency repeater includes an automatic gain control loop which samples amplified signal envelope. The automatic gain control loop is monitored and a characteristic saw tooth pattern in the gain control loop indicating feedback oscillation is detected. A nonlinear gain expander circuit may be periodically activated to allow feedback oscillation detection in repeater applications employing linearized amplifiers. | 11-27-2008 |
| 20090270028 | Rateless Coding for Multiuser Interference Relay Channel - An interference relay channel (IRC) utilizes a single relay to assist communications between multiple source-destination links under the half-duplex (HD) constraint. It is assumed that each source has an independent message and its transmitted signal may cause interference at the other destinations. It is also assumed that each node only estimates its backward channels and has no knowledge of its forward channels as well as the other links. The role of the relay is to generate signals to cooperate with the intended signal and mitigate the interference at all destinations. | 10-29-2009 |
| 20100062708 | RADIO RELAY APPARATUS AND METHOD - A disclosed radio relay apparatus receives signals from a transmitter via multiple receive antennas and transmits relay signals derived from the received signals to a receiver via multiple transmit antennas. The apparatus includes a channel estimation unit configured to estimate a forward channel matrix H | 03-11-2010 |
| 20100105320 | WIRELESS RELAY DEVICE - A wireless device connected to a plurality of wireless control devices connecting with a monitoring device, and controlled and monitored by the monitoring device via the wireless control device, the wireless device includes a transmitting and receiving unit transmitting and receiving a signal to and from the wireless control device. The wireless device includes a selecting unit selecting, from within the plurality of wireless control devices, the one wireless control device which transmits and receives a control and monitor signal, contained in the signal, by which the monitoring device controls and monitors a self-device. | 04-29-2010 |
| 20100167639 | SYSTEM AND METHOD FOR FEEDBACK CANCELLATION IN REPEATERS - An apparatus for repeating signals includes a receive antenna for receiving input signals, processing circuitry for processing the input signals to form repeated signals, and a transmit antenna for transmitting the repeated signals. The processing circuitry includes an adaptive digital filter configured to generate cancellation signals that are added to the input signals to cancel unwanted feedback signals from the input signals. A frequency shifting circuit adds a frequency shift to the input signals, after the addition of the cancellation signals, to form repeated signals that are frequency shifted from the input signals. A digital signal processor is coupled to the adaptive digital filter for digitally adapting the filter. The digital signal processor utilizes the frequency shift of the transmission signals to adapt the adaptive digital filter. | 07-01-2010 |
| 20100285744 | GAIN CONTROL METRIC COMPUTATION IN A WIRELESS REPEATER - A method for computing a gain control metric used in controlling gain in a wireless repeater operates to store correlation and normalization values associated with the gain control metric for the previous N samples in registers. For each new sample of the gain control input signal, the correlation and normalization values are computed by discarding the multiplication terms of the obsolete sample and adding the multiplication terms of the new sample to the stored correlation and normalization values. In this manner, the complexity of the computation is greatly reduced and the complexity of the computation does not increase with the integration length. | 11-11-2010 |
| 20110111694 | ON-CHANNEL REPEATING APPARATUS AND METHOD - An on-channel repeating apparatus and method is provided. The method includes subtracting a replica of a feedback signal from a signal received from a main transmitter or another repeating apparatus; demodulating and equalizing the signal to remove noise, a multipath signal, and the remaining feedback signal from the signal; inserting identification signal having good correlation properties into the signal; modulating the signal; and transmitting the modulated signal. | 05-12-2011 |
| 20110151778 | RANGING UP-SIGNAL PRE-DISTORTION SYSTEM AND METHOD - Provided is a ranging up-signal pre-distortion system and method. The ranging-up signal pre-distortion system may include a channel gain estimator to estimate a channel gain based on a down-signal, and a signal distortion unit to distort a ranging up-signal based on the estimated channel gain. | 06-23-2011 |
| 20110244790 | RELAY AND METHOD FOR SIGNAL TRANSMISSION THEREOF - A method for signal transmission of a relay, includes estimating a first modulation/demodulation channel between a transmitter and the relay and a second modulation/demodulation channel between the relay and a receiver, and an interference channel of the relay, receiving a radio frequency signal from a transmitter, generating a transformation vector using the channel estimate in order to reduce self-interference of the relay under a predetermined level, converting the radio frequency signal using the transformation vector, and transmitting the converted radio frequency signal to the receiver. | 10-06-2011 |
| 20130065515 | REPEATER WITH MOBILE COMMUNICATION DEVICE FEEDBACK - The apparatus comprises a plurality of antennas that are configured to receive wireless signals comprising communication signals and interference signals. Each antenna provides an antenna output signal that is processed by a wireless signal processor of the apparatus to generate a processed wireless signal. A user equipment (UE) communication interface is configured to transmit the processed wireless signal to the mobile wireless communication device. A signal quality feedback interface receives, from the mobile wireless communication device, a wireless feedback signal indicating the characteristic of the processed wireless signal received at the mobile wireless communication device. The wireless signal processor combines the antenna output signals based on the wireless feedback signal to minimize interference signals received at the mobile wireless communication device. | 03-14-2013 |
| 20130130620 | REPEATERS FOR WIRELESS COMMUNICAITON SYSTEMS - A repeater and associated method of use includes at least one antenna element for communicating in one direction and at least one antenna element for communicating in another direction. A radio frequency uplink path and a radio frequency downlink path are coupled between the antennas. At least one of the radio frequency uplink path or the radio frequency downlink path includes an adaptive cancellation circuit. The adaptive cancellation circuit is configured to generate a cancellation signal without requiring an injected signal. The cancellation signal, when added to a radio frequency signal in the respective uplink and downlink paths, substantially reduces feedback signals present in the radio frequency signal. | 05-23-2013 |
| 20140127989 | REPEATERS FOR WIRELESS COMMUNICATION SYSTEMS - A signal repeating element for repeating a signal includes a housing, at least one transmit antenna element positioned on one side of the housing and at least one receive antenna element positioned on the same one side of the housing. Receiver and transmitter circuitry is coupled with respective ones of the receive and transmit antenna elements. Phase circuitry for affecting the phase of signals from the at least one receive antenna element and at least one transmit antenna element is coupled between the respective receive or transmit antenna element and the receiver or transmitter circuitry. | 05-08-2014 |
| 20140141712 | Methods And Apparatus For Active Reflection - An electromagnetic reflector includes an antenna that receives an incoming signal and that transmits an outgoing signal. A three-port device, such as a circulator, has a first port electromagnetically coupled to the antenna. An RF circuit has an input that is electromagnetically coupled to the second port of the three-port device and an output that is electromagnetically coupled to the third port of the three-port device. The RF circuit changes at least one of a gain and a phase of the incoming signal to generate a desired outgoing signal that passes through the three-port device to the antenna. | 05-22-2014 |
| 20150038071 | INTERFERENCE CANCELLATION REPEATER AND REPEATING METHOD - Disclosed herein an interference cancellation repeater and repeating method. The interference cancellation repeater includes a reception unit, an analog-to-digital (AD) converter unit, a digital processing unit, a digital-to-analog (DA) converter unit, and a transmission unit. The reception unit receives an analog signal. The AD converter unit converts the analog signal into a digital signal. The digital processing unit determines whether a feedback signal is present by analyzing the correlation between the digital signal and a previous transmission signal, and performs an operation of cancelling the feedback signal if, as a result of the determination, it is determined that the feedback signal is present. The DA converter unit converts a signal output from the digital processing unit into a transmission analog signal. The transmission unit sends the transmission analog signal. | 02-05-2015 |
