Noise Or Interference Elimination Patents (Class 455/296)
  • Patent number: 10659065
    Abstract: Apparatus and methods for phase synchronization of phase-locked loops (PLLs) are provided. In certain configurations, an RF communication system includes a PLL that generates one or more output clock signals and a phase synchronization circuit that synchronizes a phase of the PLL. The phase synchronization circuit includes a sampling circuit that generates samples by sampling the one or more output clock signals based on timing of a reference clock signal. Additionally, the phase synchronization circuit includes a phase difference calculation circuit that generates a phase difference signal based on the samples and a tracking digital phase signal representing the phase of the PLL. The phase synchronization circuit further includes a phase adjustment control circuit that provides a phase adjustment to the PLL based on the phase difference signal so as to synchronize the PLL.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: May 19, 2020
    Assignee: ANALOG DEVICES, INC.
    Inventors: Christopher Mayer, David J. McLaurin, Christopher W. Angell, Sudhir Desai, Steven R. Bal
  • Patent number: 10637403
    Abstract: The present disclosure relates to digital up-conversion for a multi-band Multi-Order Power Amplifier (MOPA) that enables precise and accurate control of gain, phase, and delay of multi-band split signals input to the multi-band MOPA. In general, a multi-band MOPA is configured to amplify a multi-band signal that is split across a number, N, of inputs of the multi-band MOPA as a number, N, of multi-band split signals, where N is an order of the multi-band MOPA and is greater than or equal to 2. A digital upconversion system for the multi-band MOPA is configured to independently control a gain, phase, and delay for each of a number, M, of frequency bands of the multi-band signal for each of at least N?1, and preferably all, of the multi-band split signals.
    Type: Grant
    Filed: January 4, 2017
    Date of Patent: April 28, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Bradley John Morris, Harpreet Panesar
  • Patent number: 10637521
    Abstract: A receiver device includes an I-Q mixer circuit configured to provide an I-phase signal and a Q-phase signal. The receiver device also includes a first analog-to-digital converter (ADC) circuit configured to digitize the I-phase signal. The receiver device also includes a second ADC circuit configured to digitize the Q-phase signal. The receiver device also includes a 25% duty cycle clock generator configured to provide 25% duty cycle clock signals to the I-Q mixer. The 25% duty cycle clock generator includes a divider circuit with an inverter ring arrangement.
    Type: Grant
    Filed: December 28, 2018
    Date of Patent: April 28, 2020
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Prasanth K
  • Patent number: 10623047
    Abstract: A system for interference mitigation includes: a first transmit coupler; a receive-band noise cancellation system; a first transmit-band filter; a second transmit coupler; a first receive coupler; a transmit-band noise cancellation system; a first receive-band filter; and a second receive coupler.
    Type: Grant
    Filed: January 15, 2019
    Date of Patent: April 14, 2020
    Assignee: Kumu Networks, Inc.
    Inventors: Jung-il Choi, Mayank Jain, Wilhelm Steffen Hahn, Alfred Riddle
  • Patent number: 10616768
    Abstract: In one implementation, a wireless communication terminal includes a sense antenna module configured to sample an interference signal. The wireless communication terminal also includes a primary antenna module configured to receive a desired signal. The sense antenna module has a first polarization type, and the primary antenna module has a second polarization type, substantially orthogonal to the first polarization type of the sense antenna module. In addition, the wireless communication terminal includes at least one signal combiner configured to receive output from the sense antenna module and output from the primary antenna module. The at least one signal combiner is configured to mitigate interference with the desired signal by shifting the phase of the output from the sense antenna module by substantially 180 degrees and combining the phase-shifted output from the sense antenna module with the output of the primary antenna module to produce an interference mitigated signal.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: April 7, 2020
    Assignee: Iridium Satellite LLC
    Inventor: Jeffrey Bull
  • Patent number: 10601456
    Abstract: A passive intermodulation detection system is provided to remotely identify passive intermodulation at a base station site and diagnose the type of intermodulation and location of the non-linearity that is the source of the passive intermodulation. A passive intermodulation cancelation system can generate an equivalent signal to a received interference signal and use the equivalent signal to generate an error signal. The error signal can then be used to reinforce a learning system and converge on a steady state of the interference signal to cancel other interference signals.
    Type: Grant
    Filed: January 2, 2019
    Date of Patent: March 24, 2020
    Assignee: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: Ernest Tsui, Paul Maxwell, Weihua Ye
  • Patent number: 10601542
    Abstract: Methods and apparatus for transmitting Ethernet data along an Ethernet link with a BASE-T transceiver are disclosed. One exemplary BASE-T Ethernet transceiver includes an Ethernet data framing module having an input interface to receive Ethernet block data bits at a first data rate. Logic associates the Ethernet block data bits with an auxiliary bit and a number of zero bits. An error encoder is coupled to the logic to encode all of the data bits, auxiliary bit and zero bits into an error encoded transport frame having plural error check bits. A symbol mapper receives the error encoded transport frame and transforms the error encoded transport frame into multiple symbols. A transmitter coupled to the symbol mapper transmits the multiple symbols over an Ethernet link at one of a selection of symbol rates. The data rate of data transmitted over the Ethernet link is based on the number of zero bits.
    Type: Grant
    Filed: August 27, 2018
    Date of Patent: March 24, 2020
    Assignee: Marvell Asia Pte, LTD.
    Inventors: Ramin Farjadrad, Paul Langner, Hossein Sedarat, Ramin Shirani, Kamal Dalmia
  • Patent number: 10593337
    Abstract: To enable to favorably send a compressed digital audio signal at a high data rate. First, second, and third metadata are added to a compressed digital audio signal of a predetermined number of channels. The first metadata is metadata indicating a sending frequency of the compressed digital audio signal. The second metadata is metadata indicating a sampling frequency used for converting an uncompressed digital audio signal of each channel into an analog signal. The third metadata is metadata indicating a ratio of the sending frequency to the sampling frequency. The compressed digital audio signal provided with each type of the metadata is transmitted to an external device through a predetermined sending path.
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: March 17, 2020
    Assignee: SONY CORPORATION
    Inventor: Gen Ichimura
  • Patent number: 10582537
    Abstract: Embodiments of an access point (AP), station (STA) and method for channel access are generally described herein. The AP may contend for access to a channel. The contention may be performed in accordance with an omni-directional enhanced distributed channel access function (EDCAF) for transmission within an omni-directional pattern. The contention may be further performed in accordance with a directional EDCAF for transmission to a station (STA) in a directional pattern. The AP may determine whether to transmit within the omni-directional pattern based at least partly on an omni-directional backoff parameter. The AP may further determine whether to transmit in the directional pattern based at least partly on a directional backoff parameter.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: March 3, 2020
    Assignee: Intel IP Corporation
    Inventors: Laurent Cariou, Carlos Cordeiro, Ou Yang, Solomon B. Trainin
  • Patent number: 10567020
    Abstract: A device for processing an audio signal arising from a radiofrequency signal, including: an instantaneous multipath sensor able to analyze the radiofrequency signal so as to determine an instantaneous multipath rate, an instantaneous filter block able to attenuate the audio signal in line with an instantaneous attenuation that is an increasing function of the instantaneous multipath rate, also including a mean multipath sensor able to determine a mean multipath rate, and a mean filter block able to attenuate the audio signal in line with a mean attenuation that is an increasing function of the mean multipath rate. A radio receiver having such a processing device is also disclosed.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: February 18, 2020
    Assignees: Continental Automotive France, Continental Automotive GmbH
    Inventors: Jean-Christophe Grzeskowiak, Laurent Thery
  • Patent number: 10567210
    Abstract: Methods and apparatus for facilitating wireless communication using digital Quadrature Amplitude Modulation are disclosed. A mapping module electronic component of a wireless communication device utilizes a signal constellation for quadrature modulating a signal for transmission or quadrature demodulating a received signal. The signal constellation includes multiple constellation symbols and associated bit sequences. Specific signal constellations are disclosed. The signal constellations may be obtained through an optimization procedure which accounts for both phase noise and power amplifier nonlinearity.
    Type: Grant
    Filed: October 10, 2017
    Date of Patent: February 18, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Guido Montorsi, Sergio Benedetto, Yan Xin, Min Yan
  • Patent number: 10523182
    Abstract: Disclosed systems and methods relate to an adaptive harmonic cancellation circuit for communication. The adaptive harmonic cancellation circuit includes a harmonic generator circuit configured to generate a reference harmonic of an interference signal. The adaptive harmonic cancellation circuit includes a harmonic prediction circuit coupled to the harmonic generator circuit. The harmonic prediction circuit is configured to receive an input signal including a target signal at a frequency and a radiated harmonic of the interference signal. The harmonic prediction circuit is configured to generate a predicted harmonic of the interference signal by modifying the reference harmonic of the interference signal to match the radiated harmonic of the interference signal in the input signal. The adaptive harmonic cancellation circuit includes a cancellation circuit coupled to the harmonic prediction circuit.
    Type: Grant
    Filed: August 22, 2018
    Date of Patent: December 31, 2019
    Assignee: ROCKWELL COLLINS, INC.
    Inventor: William Bascom Sorsby
  • Patent number: 10511290
    Abstract: In a sine-wave multiplier, signal components included in an output signal Qu1 and corresponding to the product of a third-order harmonic component of a first square wave W1 and an input signal Vi and the product of a fifth-order harmonic component of the first square wave W1 and the input signal Vi are offset by a signal component included in an output signal Qu2 and corresponding to the product of a fundamental component of a second square wave W2 and the input signal Vi and a signal component included in an output signal Qu3 and corresponding to the product of a fundamental component of a second square wave W3 and the input signal Vi.
    Type: Grant
    Filed: April 11, 2018
    Date of Patent: December 17, 2019
    Assignee: ALPS ALPINE CO., LTD.
    Inventors: Akira Asao, Kiyoshi Sasai, Tatsumi Fujiyoshi
  • Patent number: 10482810
    Abstract: A portable information handling system display integrates a MIMO antenna configuration that cooperates with a radio to adapt display operations for supporting wireless communication. For example, plural antenna nanowires integrated with display pixel control wires selectively interface with a MIMO radio with the antenna wires selected based upon display operational characteristics, such as the presentation of visual information at the display and the enablement or disablement of touch detection circuits.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: November 19, 2019
    Assignee: Dell Products L.P.
    Inventors: Deeder M. Aurongzeb, Jung-Hwan Hong, Brian Hargrove Leonard, Christopher A. Torres, Erin K. Walline
  • Patent number: 10477479
    Abstract: According to one embodiment, a wireless communication device includes: a wireless communicator configured to transmit and receive a signal; and controlling circuitry configured to detect a first wireless communication device through the wireless communicator. The wireless communicator is configured to transmit a control signal preset between the wireless communication device and the first wireless communication device to activate the first wireless communication device when the controlling circuitry has not detected the first wireless communication device.
    Type: Grant
    Filed: September 14, 2017
    Date of Patent: November 12, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tomoko Adachi, Takafumi Sakamoto
  • Patent number: 10454733
    Abstract: Disclosed is a sequence generation method for: generating a basic sequence structure comprising C52, which is composed of 52 tones, and D12, which is composed of 12 tones; selecting any one among a plurality of phase rotation factors, which are determined in advance for a bandwidth and applied to the basic sequence structure by unit of C52 or C52D12; and generating a sequence inserted into a preamble to be transmitted to a terminal.
    Type: Grant
    Filed: October 5, 2015
    Date of Patent: October 22, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Kilbom Lee, Jinsoo Choi, Wookbong Lee, Hangyu Cho, Jiwon Kang
  • Patent number: 10419047
    Abstract: In one embodiment, a noise cancellation circuit includes: a window generator to generate a window having a first set of samples; a band splitter to split the window into pairs of symmetric frequency components; a processing circuit, for each of the pairs, to: compare a first magnitude of a first symmetric frequency component to a second magnitude of a second symmetric frequency component and modify one of the components based at least in part on the comparison; an integrator to integrate the pairs output from the processing circuit; and a second window generator to generate a second window having a second set of samples.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: September 17, 2019
    Assignee: Silicon Laboratories Inc.
    Inventors: Carl Harry Alelyunas, Russell Croman, Thomas Glen Ragan, Tarang Shah
  • Patent number: 10321338
    Abstract: A method and an apparatus for cancelling interference in a wireless communication system are provided. The method includes acquiring interference signal information on a reception signal received from a base station based on a preconfigured constellation set, and cancelling an interference signal from the reception signal by using the acquired interference signal information. Accordingly, reception performance in a cell edge can be improved by acquiring dominant interference signal information.
    Type: Grant
    Filed: April 2, 2018
    Date of Patent: June 11, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Taeyoon Kim, Mingoo Kim, Jonghan Lim, Chaeman Lim
  • Patent number: 10277184
    Abstract: Devices, systems and methods for analog automatic gain control (AGC) based on estimated distributions of signal characteristics are described. One example method includes generating a digital measurement of a first signal characteristic based on a second signal characteristic of an input signal received by the device, where the second signal characteristic is based on a level of the input signal. The digital measurement of the signal characteristic is used to update a statistical model for the input signal and the posterior probability distribution of the second signal characteristic conditioned on previous digital measurements of the first signal characteristic. The updated posterior probability distribution is used to generate a gain estimate, which is then used to adjust the power level of the input signal. Another example method may use multiple statistical models for each waveform supported by the system.
    Type: Grant
    Filed: May 18, 2018
    Date of Patent: April 30, 2019
    Assignee: TrellisWare Technologies, Inc.
    Inventors: Cenk Köse, Keith M. Chugg
  • Patent number: 10263653
    Abstract: A noise reduction device according to an aspect of an embodiment includes a detection unit, a calculation unit, and a reduction unit. The detection unit detects frequency components of a plurality of noise signals that are included in a received signal, based on a frequency spectrum of the received signal. The calculation unit calculates a coefficient, based on the frequency components that are detected by the detection unit. The reduction unit reduces n noise signals that are at least a part of the plurality of noise signals from the received signal, depending on the coefficient that is calculated by the calculation unit (where n is a positive number that is greater than or equal to 2).
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: April 16, 2019
    Assignee: DENSO TEN Limited
    Inventor: Masaaki Taira
  • Patent number: 10158387
    Abstract: An frequency down-converter includes a mixer configured to receive a RF (radio frequency) signal having a first end and a second end and output an intermediate signal comprising a first end and a second end in accordance with a LO (local oscillator) signal having a first end and a second end, wherein the first end and the second end of the LO signal jointly form a two-phase periodic signal of a fundamental frequency approximately equal to a mean frequency of a desired component of the RF signal.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: December 18, 2018
    Assignee: REALTEK SEMICONDUCTOR CORP.
    Inventors: Serkan Sayilir, Poh Boon Leong, Chia-Liang (Leon) Lin
  • Patent number: 10094930
    Abstract: A system to detect spoofing attacks is provided. The system includes a satellite-motion-and-receiver-clock-correction module, a compute-predicted-range-and-delta-range module, a subtractor, and delta-range-difference-detection logic. The satellite-motion-and-receiver-clock-correction module periodically inputs, from a global navigation satellite system (GNSS) receiver, a carrier phase range for a plurality of satellites. The satellite-motion-and-receiver-clock-correction module outputs a corrected-delta-carrier-phase range for a current epoch to a first input of a subtractor. The compute-predicted-range-and-delta-range module outputs a predicted delta range to a second input of the subtractor. The predicted delta range is based on inertial measurements observed for the current epoch. The subtractor outputs a difference between the corrected-delta-carrier-phase range and the predicted delta range for the current epoch to delta-range-difference-detection logic.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: October 9, 2018
    Assignee: Honeywell International Inc.
    Inventors: Brian W. Schipper, Kevin Sweeney, Wesley J. Hawkinson
  • Patent number: 10033417
    Abstract: An interference signal cancellation apparatus, includes a first power divider configured to divide a cancellation reference signal link corresponding to a transmit antenna into a first reference link and a second reference link. The apparatus includes a second power divider configured to divide a signal receiving link connected to a receive antenna into a first receiving link and a second receiving link, and use the first receiving link as an output link. The apparatus includes a primary cancellation unit that is located at the first reference link and that is connected to the signal receiving link by using a coupler. The apparatus includes a secondary cancellation unit that is located at the second reference link and that is connected to the second receiving link by using a coupler. The apparatus includes a control module connected to the second receiving link, the primary cancellation unit, and the secondary cancellation unit.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: July 24, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventor: Yu Liu
  • Patent number: 10033353
    Abstract: An improved switchable capacitor array comprises a plurality of n?2 capacitor units, each comprising a capacitor with a capacitance and a switch unit. The capacitor units are electrically connected in series. Equidistantly spaced impedance values can be obtained if the values of the capacitances are chosen properly.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: July 24, 2018
    Assignee: QUALCOMM Technologies, Inc.
    Inventor: Maurice De Jongh
  • Patent number: 9986572
    Abstract: A method for reporting channel state information by a UE having an interference removal ability in a wireless communication system according to an embodiment of the present invention may comprise the steps of: receiving, from a serving cell, information for removal of interference by an adjacent cell; removing the interference or calculating the channel state information and transmitting the calculated channel state to the serving cell, wherein the information for removal of interference may comprise information indicating whether interference by a transmission signal of the adjacent cell exists in a CSI-interference measurement (IM) resource of the serving cell.
    Type: Grant
    Filed: July 21, 2015
    Date of Patent: May 29, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Kijun Kim, Hyungtae Kim
  • Patent number: 9954699
    Abstract: The present invention proposes a demodulator device, a receiver and a demodulation method for M-ary amplitude shift keying systems (MASK) that requires partial knowledge of the CSI, namely, the channel attenuation coefficient. Therefore, the new demodulator, receiver and demodulation method do not require the knowledge of the channel phase shift. Consequently, no complicated channel estimation techniques are required, and the system will be very robust to the system impairments such as phase noise, I-Q imbalance, etc. In this sense, the new technique is denoted as semi-coherent demodulation (SCD). To reduce the complexity of the new SCD, a suboptimal demodulator is derived which has much lower complexity than the optimal while providing almost the same error probability.
    Type: Grant
    Filed: November 14, 2016
    Date of Patent: April 24, 2018
    Assignee: Khalifa University of Science and Technology
    Inventors: Arafat Jamil Al-Dweik, Youssef Iraqi, Mohammed Al-Mualla
  • Patent number: 9936398
    Abstract: A method and an apparatus for cancelling interference in a wireless communication system are provided. The method includes acquiring interference signal information on a reception signal received from a base station based on a preconfigured constellation set, and cancelling an interference signal from the reception signal by using the acquired interference signal information. Accordingly, reception performance in a cell edge can be improved by acquiring dominant interference signal information.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: April 3, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Taeyoon Kim, Mingoo Kim, Jonghan Lim, Chaeman Lim
  • Patent number: 9936400
    Abstract: Techniques for channel selection in a shared communication medium are disclosed. A communication apparatus may include one or more transceivers, a processor, and memory coupled to the processor and configured to store data and/or instructions. The one or more transceivers may be configured to monitor signaling on a plurality of available channels associated with a communication medium. The processor may be configured to determine an interference level for each of the plurality of available channels based on the monitored signaling, determine that the interference level for each of the plurality of available channels is greater than a first threshold, determine whether a triggering condition is met, and select the first channel of the plurality of channels as an operating channel for a primary radio access technology based on the triggering condition being met, the first channel having an interference level that is greater than a second threshold.
    Type: Grant
    Filed: September 12, 2015
    Date of Patent: April 3, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Heechoon Lee, Akula Aneesh Reddy, Ahmed Kamel Sadek, Tamer Adel Kadous
  • Patent number: 9900030
    Abstract: An apparatus comprises: radio frequency (RF) transceiver circuitry for electrical coupling to an antenna and including: a local oscillator (LO) circuit configured to generate a LO signal, and a mixer circuit configured to mix a CW tone signal with the LO signal; a measurement receiver path configured to measure an antenna signal, wherein the antenna signal includes the CW tone signal mixed with the LO signal; and baseband processing circuitry electrically coupled to the measurement receiver path and configured to adjust a clock duty ratio of the LO signal to reduce one or more counter intermodulation (CIM) signals in the antenna signal.
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: February 20, 2018
    Assignee: Futurewei Technologies, Inc.
    Inventors: Hong Jiang, Zhihang Zhang, Jamil Forrester, Wael Al-Qaq
  • Patent number: 9887717
    Abstract: There is provided systems and methods for mitigating foreign interference by complementing a receiver of a wireless network, comprising: using antennas for reception of desired signals and interference signals; determining the presence of an interference signal originating from at least one foreign transmitting source in the received signals, and for determining a termination of the interference signal; determining the presence of a desired signal originating from the wireless communication network in the received signals; calculating a suitable combination of the received signals, wherein the effect induced by the interference signal is reduced and the impact of an interference cancellation on the desired signals is reduced; and providing the suitable combination to a receiver of a wireless communication network; wherein the method is performed complementary to the receiver of the wireless network and the antennas.
    Type: Grant
    Filed: November 14, 2016
    Date of Patent: February 6, 2018
    Assignee: Ubiqam Ltd.
    Inventors: Baruch Cyzs, Amir Meir, Oren Amidan, Daniel Manor
  • Patent number: 9877259
    Abstract: Operational and environmental efficiency in virtual radio access networks (VRANs) can be improved by offloading data traffic and/or control signaling between physical transmit points (TPs) of a virtual TP. This may allow one or more physical TPs of the virtual TP to be muted in the downlink or uplink direction, thereby reducing energy consumption. The offloading may be performed during relatively short time-intervals such that physical TP are muted for one or more transmission time intervals (TTIs) before being re-activated. The offloading may also be implemented over longer time-intervals in accordance with a traffic engineering (TE) policy. Further it is possible to re-activate a de-activated downlink transmitter of physical TP by monitoring wireless signals via an activated receiver of the physical TP.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: January 23, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Mohamed Adel Salem, Jianglei Ma, Mohammadhadi Baligh
  • Patent number: 9872305
    Abstract: A method includes identifying interference mitigation capabilities of a first communication unit in a first cell of a cellular communication network. Transmissions of a second communication unit in a second cell of the cellular communication network are scheduled based on the identified interference mitigation capabilities of the first communication unit in the first cell.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: January 16, 2018
    Assignee: MARVELL INTERNATIONAL LTD.
    Inventors: Shimon Moshavi, Ezer Melzer, Yona Perets
  • Patent number: 9843984
    Abstract: Operational and environmental efficiency in virtual radio access networks (VRANs) can be improved by offloading data traffic and/or control signaling between physical transmit points (TPs) of a virtual TP. This may allow one or more physical TPs of the virtual TP to be muted in the downlink or uplink direction, thereby reducing energy consumption. The offloading may be performed during relatively short time-intervals such that physical TP are muted for one or more transmission time intervals (TTIs) before being re-activated. The offloading may also be implemented over longer time-intervals in accordance with a traffic engineering (TE) policy. Further it is possible to re-activate a de-activated downlink transmitter of physical TP by monitoring wireless signals via an activated receiver of the physical TP.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: December 12, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Mohamed Adel Salem, Jianglei Ma, Mohammadhadi Baligh
  • Patent number: 9819424
    Abstract: Methods and apparatus to mitigate radio frequency interference generated by hardware circuitry and received by wireless circuitry of a wireless communication device are described. A processor obtains a set of wireless performance metrics for signals received by the wireless circuitry. The processor determines a preferred operating mode for the hardware circuitry based on the set of wireless performance metrics and provides an indication of the preferred operating mode to the hardware circuitry. The hardware circuitry is configured for operation in accordance with the preferred operating mode. The processor and/or a second processor provide an indication to the wireless circuitry when the hardware circuitry initiates and terminates an operation that can cause radio frequency interference into the wireless circuitry. The wireless circuitry is configured during a time period that the hardware circuitry is operational to mitigate effects of radio frequency interference generated by the hardware circuitry.
    Type: Grant
    Filed: September 9, 2014
    Date of Patent: November 14, 2017
    Assignee: Apple Inc.
    Inventor: Sanjeevi Balasubramanian
  • Patent number: 9813168
    Abstract: The present invention discloses a self-interference signal cancellation device. The device includes a first self-interference cancellation unit, configured to: obtain a first analog signal by coupling a transmit signal output by an analog transmit processing module; perform analog-to-digital conversion on the first analog signal, to obtain a first digital signal; perform interference reconstruction according to the first digital signal, to obtain a first digital interference cancellation signal; and cancel, according to the first digital interference cancellation signal, a self-interference signal included in a digital signal output by a first analog-to-digital conversion module, to obtain a first output signal, and output the first output signal to a digital receive processing module.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: November 7, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Taofu Mo, Huajiong Lin, Long Luo, Bo Han, Weimin Chen, Siqing Ye, Linjun Lv
  • Patent number: 9800218
    Abstract: The disclosure relates to an alternating current (AC) coupling circuit including first and second capacitors having first and second input terminals configured to receive an input differential signal and generate an output differential signal at first and second output terminals of the first and second capacitors. The AC coupling circuit further includes a baseline wander correction circuit configured to make the output differential signal resistant to baseline wander due to the input differential signal including one or more time intervals of unbalanced data. The baseline wander correction circuit includes a differential difference amplifier (DDA) having a first differential input configured to receive the input differential signal, a differential output configured to generate a compensation differential signal, and a second differential input configured to receive the compensation differential signal.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: October 24, 2017
    Assignee: QUALCOMM Incorporated
    Inventor: Todd Morgan Rasmus
  • Patent number: 9794104
    Abstract: Methods and apparatus for facilitating wireless communication using digital Quadrature Amplitude Modulation are disclosed. A mapping module electronic component of a wireless communication device utilizes a signal constellation for quadrature modulating a signal for transmission or quadrature demodulating a received signal. The signal constellation includes multiple constellation symbols and associated bit sequences. Specific signal constellations are disclosed. The signal constellations may be obtained through an optimization procedure which accounts for both phase noise and power amplifier nonlinearity.
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: October 17, 2017
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Guido Montorsi, Sergio Benedetto, Yan Xin, Min Yan
  • Patent number: 9749263
    Abstract: Disclosed herein are methods and systems for identifying and reducing LTE-system coverage holes due to external interference. One embodiment takes the form of a process that includes receiving a signal in a first wireless band. The received signal comprises a signal of interest. The process also includes determining that a received signal quality of the signal of interest is less than a signal-quality threshold. The process also includes determining that the received signal quality of the signal of interest is less than the signal-quality threshold due to interference external to the first wireless band, and responsively attenuating the received signal. The process also includes demodulating the attenuated received signal to obtain the signal of interest.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: August 29, 2017
    Assignee: MOTOROLA SOLUTIONS, INC.
    Inventors: Xiaowei Jin, Michael H Baker, Isam R Makhlouf
  • Patent number: 9726574
    Abstract: A zeroing method and zeroing device for an optical time-domain reflectometer (OTDR) are disclosed. The zeroing method includes: before starting the optical time-domain reflectometer, when a laser device is in an off state, sending a zeroing signal; and performing zeroing processing according to the zeroing signal. In the embodiments of the present invention, the feedback zeroing can be performed on a receiving circuit by utilizing the idle time prior to a test or during the test, thus the influence of an offset voltage is reduced, and a problem of operational-amplifier zero drift also can be solved in the meantime, which improves a detectability of the OTDR, and overcomes a disadvantage that a manual zeroing method is not intelligent and a measured waveform introduced in an automatic zeroing method is bad.
    Type: Grant
    Filed: September 16, 2013
    Date of Patent: August 8, 2017
    Assignee: ZTE CORPORATION
    Inventors: Meidong Zhu, Han Xu, Jianzhang Chen, Jianxin Lu
  • Patent number: 9723572
    Abstract: Methods and systems for facilitating uplink power control (PC) and scheduling in a wireless network are provided. In one example, common interference patterns are obtained from long term channel statistics, and used to perform local PC and scheduling by distributed base stations (eNBs). In some implementations, the common interference patterns are obtained through statistical narrowing techniques that identify common ones out of a plurality of potential interference patterns. The common interference patterns may specify maximum interference thresholds and/or individual eNB-to-eNB interference thresholds which may govern the local PC and scheduling decisions of the distributed eNBs.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: August 1, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Nimal Gamini Senarath, Hang Zhang, Liqing Zhang, Ho Ting Cheng
  • Patent number: 9712205
    Abstract: A duplex unit allowing simultaneous transmission and reception of microwave signals on at least partly overlapping frequency bands, comprising an interference canceller unit and a control unit, the duplex unit being arranged to receive a transmit signal and to output a first part of the transmit signal at an antenna port, the duplex unit further being arranged to receive a receive signal comprising a payload signal at the antenna port, and to output a combination of the receive signal and a filtered transmit signal as an interference suppressed receive signal of the duplex unit.
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: July 18, 2017
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Ola Tageman, Mats Rydström, Yinggang Li, Dan Weinholt
  • Patent number: 9681807
    Abstract: Systems and methods for processing, transmitting and displaying data received from an analyte sensor, such as a glucose sensor, are disclosed. In an embodiment, a method for transmitting data between a first communication device associated with an analyte sensor and a second communication device configured to provide user access to sensor-related information comprises: activating a transceiver of a first communication device associated with an analyte sensor at a first time; and establishing a two-way communication channel with the second communication device; wherein the activating comprises waking the transceiver from a low power sleep mode using a forced wakeup from the second communication device.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: June 20, 2017
    Assignee: DexCom, Inc.
    Inventors: Thomas Miller, Mark Dervaes, Phong Lieu, Peter C. Simpson, Shawn Larvenz, Jacob S. Leach, Sebastian Bohm
  • Patent number: 9673959
    Abstract: A method that calibrates a device for echo cancellation and a device with calibration for echo cancellation are provided. Devices may be calibrated such that the echo residual error is less than a threshold determined by the calibration accuracy. Non-ideal factors such as mismatch may be eliminated during calibration.
    Type: Grant
    Filed: September 12, 2014
    Date of Patent: June 6, 2017
    Assignee: Lattice Semiconductor Corporation
    Inventors: Kai Zhou, Shinje Tahk, Kai Lei, Qiming Wu, Gijung Ahn, Min-Kyu Kim, Fei Song, Kexin Luo
  • Patent number: 9667292
    Abstract: A data processing system may include a transmit circuit configured to transmit a first signal sequence comprising one or more signals, a receive circuit configured to transmit a second signal sequence comprising one or more additional signals, wherein one or more signals of the second signal sequence comprise an interference component related to the first signal sequence, and a processing circuit.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: May 30, 2017
    Assignee: INTEL CORPORATION
    Inventors: Feng Xue, Yang-Seok Choi, Shu-Ping Yeh, Shilpa Talwar
  • Patent number: 9654274
    Abstract: Systems and methods for mitigating self-interference at a wireless device in a cellular communications network are disclosed. In one embodiment, a network node obtains one or more self-interference parameters for self-interference at the wireless device within a downlink frequency band utilized by the wireless device. In one embodiment, the one or more self-interference parameters include a frequency location of the self-interference, a strength of the self-interference, or both the frequency location and the strength of the self-interference. The network node then controls uplink transmission by the wireless device, downlink reception by the wireless device, and/or downlink transmission to the wireless device in such a manner that the self-interference at the wireless device is mitigated.
    Type: Grant
    Filed: November 7, 2013
    Date of Patent: May 16, 2017
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Chester Park, Jung-Fu Cheng
  • Patent number: 9641215
    Abstract: A transceiver arrangement (200) for a fixed point-to-point radio link. The transceiver arrangement (200) comprising a transceiver (215) connected to a first antenna (210) and to a second antenna (220). The transceiver (215) being arranged to transmit a first transmit signal (211) via the first antenna (210) in a first frequency band (f1), the transceiver (215) also being arranged to receive a first receive signal (212) via the first antenna (210) in a second frequency band (f2), the transceiver (215) further being arranged to transmit a second transmit signal (221) via the second antenna (220) in the second frequency band (f2), the transceiver (215) also being arranged to receive a second receive signal (222) via the second antenna (220) in the first frequency band (f1).
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: May 2, 2017
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Robert Lindgren, Per-Arne Thorsén
  • Patent number: 9641272
    Abstract: Methods, systems, and devices are described for eliminating interference from a convoluted signal comprising several signals of different radio access technologies (RATs), such as a Long Term Evolution (LTE) signal and wireless local area network (WLAN) signal, in an unlicensed or shared radio frequency spectrum band are described. In accordance with the present disclosure, a dual-radio mobile device may utilize a multiple radios to assist in the operation of interference cancellation. Specifically, in some examples, a first radio (e.g., WLAN radio) may process the received convoluted signal to reconstruct a first signal (e.g., WLAN signal). The reconstructed first signal may be utilized by a second radio (e.g., LTE radio) to identify a second signal (e.g., LTE signal) in the received convoluted signal by cancelling or removing the reconstructed first signal from the convoluted signal.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: May 2, 2017
    Assignee: QUALCOMM Incorporated
    Inventor: Jibing Wang
  • Patent number: 9621132
    Abstract: An antenna tuning apparatus for a multiport antenna array used for sending and/or receiving electromagnetic waves for radio communication comprises: 4 antenna ports, 4 user ports, 10 adjustable impedance devices each presenting a negative reactance and having a terminal coupled to one of the antenna ports, 4 windings each having a first terminal coupled to one of the antenna ports and a second terminal coupled to one of the user ports, and 10 adjustable impedance devices each presenting a negative reactance and having a terminal coupled to one of the user ports. All adjustable impedance devices are adjustable by electrical means. Any small variation in the impedance matrix of the antenna array, caused by a change in operating frequency or a change in the medium surrounding the antennas, can be compensated with a new adjustment of the adjustable impedance devices.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: April 11, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Frédéric Broyde, Evelyne Clavelier
  • Patent number: 9577686
    Abstract: A method and system for providing radio frequency auto gain control (RF AGC) for a specific frequency is provided herein. The method includes obtaining a noise measurement (N) and radio frequency level for the specific frequency; scanning a band of frequencies that the specific frequency is part of, and storing a plurality of undesired frequencies; computing a frequency intermodulation up to a predetermined level based on the plurality of undesired frequencies; and in response to the frequency intermodulation being not equal to the specific frequency, performing an iterative process to readjust the RF AGC, the iterative process including a readjustment of the RF AGC based on a noise floor performance.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: February 21, 2017
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Yao H. Kuo, Christopher John Barranger
  • Patent number: 9571143
    Abstract: Systems, methods, apparatuses, and computer readable media are disclosed for providing interference rejection in ultra-wideband real time locating systems. In one embodiment, an ultra-wideband (UWB) receiver is configured to: receive a composite signal, the composite signal comprising a UWB signal transmitted from within a monitored region and an interference signal transmitted from a source positioned outside the monitored region; filtering at least a first component of the composite signal representing the interference signal with a tunable notch filter to generate a filtered signal; determining an interference level in the filtered signal; and adjust the tunable notch filter to reduce the interference level. Corresponding systems, methods, and computer-readable storage medium are also provided.
    Type: Grant
    Filed: July 15, 2013
    Date of Patent: February 14, 2017
    Assignee: ZIH Corp.
    Inventor: Edward A. Richley