Antinoise Or Distortion (includes Predistortion) Patents (Class 375/296)
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Patent number: 10148328Abstract: The present disclosure provides a method of generating codebook in a wireless communication system with multiple antenna arrays, as well as a wireless communication system, base station and terminal using the codebook for communication. The method comprises steps of: providing a basic codebook which contains multiple pre-coding matrices; and assigning phase offsets to certain pre-coding matrices in the basic codebook to form a codebook with phase offset. The feedback overhead from a client to a base station side is reduced and a good precision of feedback for multi-antenna array is kept by applying the method of generating codebook and using the generated codebook in the wireless communication system, base station and terminal.Type: GrantFiled: October 3, 2017Date of Patent: December 4, 2018Assignee: Sun Patent TrustInventors: Hui Tong, Masayuki Hoshino, Ming Xu, Seigo Nakao, Daichi Imamura
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Patent number: 10148230Abstract: A predistortion circuit receives an input polar signal to be transmitted, including an input amplitude signal and an input phase signal. The input polar signal is predistorted using at least one predistortion parameter selected from a lookup table. A phase-and-amplitude modulated radio-frequency signal is generated corresponding to the predistorted polar signal. A copy of the generated radio-frequency signal is provided to a polar receiver. The polar receiver is operated to generate, from the copy of the radio-frequency signal and without information relating to the generated transmit signal, a feedback polar signal including a feedback amplitude signal and a feedback phase signal. The feedback polar signal is compared to the input polar signal, the lookup table is updated in response to the comparison.Type: GrantFiled: July 19, 2017Date of Patent: December 4, 2018Assignee: Innophase, Inc.Inventors: Yang Xu, Sara Munoz Hermoso
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Patent number: 10148231Abstract: An apparatus includes an RF power amplifier with a controller and an impedance matching network. The RF power amplifier is configured to drive a load in electrical communication with the RF power amplifier. The impedance matching network is located electrically between the RF power amplifier and the load. The impedance matching network is configured to match an output impedance of the RF power amplifier and an impedance of the load. The impedance matching network includes a set of fixed value impedance matching circuits configured to provide different discrete values. The RF amplifier includes a variable DC power supply powering RF transistors to result in a variable output impedance for the amplifier. The controller selects an impedance matching circuit of the capacitor presets and/or the right setting for the variable DC supply that result in minimum reflected power to match the output impedance of the amplifier to the output load impedance.Type: GrantFiled: June 14, 2016Date of Patent: December 4, 2018Assignee: Analogic CorporationInventors: Ahmed A. Hussein, Gerald A. Brimmer, Robert G. Haefner, Jr., Matthew Hanlon
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Patent number: 10149306Abstract: Techniques disclosed herein involve network-side and device-side operations that provide for the advantageous use of a reduced set of precoders within a larger full set of precoders. The reduced set is identified dynamically, based on characteristics of the channel between a radio network node and a wireless device, and the use of a defined mapping function that maps the reduced set of precoders within the larger full set to a reduced set of index values. Reporting precoders from the reduced set offers significant reductions in signaling overhead because of the smaller size of the index values used to index the reduced set, while simultaneously offering the ability to choose from precoders matched to current channel conditions.Type: GrantFiled: April 7, 2017Date of Patent: December 4, 2018Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Jonas Fröberg Olsson, Mirsad Cirkic, Martin Hessler, Kristina Hessler
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Patent number: 10142801Abstract: Embodiments of the disclosure relate to a transceiver circuit employing shared digital signal processing circuitry for communicating radio frequency (RF) analog communications signals received by a remote unit in a wireless distribution system (WDS). A transceiver circuit includes downlink digital signal processing circuitry that receives and processes a downlink digital communications signal(s) having a first downlink digital baseband signal and a second downlink digital baseband signal. A first downlink analog signal path and a second downlink analog signal path share the downlink digital signal processing circuitry. The first downlink analog signal path generates a first downlink analog RF communications signal. The second downlink analog signal path generates a second downlink analog RF communications signal.Type: GrantFiled: August 4, 2016Date of Patent: November 27, 2018Assignee: Corning Optical Communications Wireless LtdInventor: Maor Saig
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Patent number: 10142150Abstract: An exemplary embodiment of the present invention provides a pilot signal generating apparatus, including: a changed amount estimating unit which estimates a changed amount of a pilot symbol due to interference of a data symbol which is adjacent to a predefined position of the pilot symbol; and a symbol generating unit which generates the pilot symbol in consideration of the estimated changed amount.Type: GrantFiled: October 6, 2016Date of Patent: November 27, 2018Assignees: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATIONInventors: Young Su Kim, Dong Seog Han, Myung Chul Park, Hyoung Soo Lim, Nam Ho Hur
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Patent number: 10103775Abstract: A method and radio node for controlling transmission of radio signals in a transmitter band to avoid or reduce interference in a victim band, the victim band being separate from the transmitter band in frequency domain. The radio node applies Digital Pre-Distortion, DPD, on signals to be transmitted on at least one carrier in the transmitter band, such that Intermodulation Distortion, IMD, components of the signals are pre-distorted asymmetrically relative the at least one carrier to suppress at least one of the IMD components falling within the victim band. The pre-distorted signals are then amplified in a power amplifier and transmitted on the at least one carrier.Type: GrantFiled: May 27, 2014Date of Patent: October 16, 2018Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Kauko Heinikoski, Marko E Leinonen
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Patent number: 10084630Abstract: A system for use with beam signals, the system including: a crest factor reduction (CFR) module having inputs and corresponding outputs, wherein each of the inputs is for receiving a corresponding different beam signal of the beam signals and wherein each output corresponds to a different input of the plurality of inputs and is for outputting a different CFR-adjusted signal of a plurality of CFR-adjusted signals, each CFR-adjusted signal of the plurality of CFR-adjusted signals corresponding to a different beam signal of the plurality of beam signals; and a transmitter connected to the outputs of the CFR module, wherein the CFR module is configured to perform crest factor reduction on the beam signals to generate the plurality of CFR-adjusted signals, and wherein the crest factor reduction performed on the beam signals is based on a weighted sum of the magnitudes of multiple beams signals among the beam signals.Type: GrantFiled: December 22, 2016Date of Patent: September 25, 2018Assignee: Blue Danube Systems, Inc.Inventors: Chris Tsun Kit Ng, Ramesh Chembil-Palat
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Patent number: 10084463Abstract: A transceiver including: a reconfigurable circuit including a plurality of units including at least a converter, the converter including: a digital-to-analog converter (DAC); successive approximation register (SAR) logic configured to selectively couple to the DAC; and a plurality of switches configured to reconfigure the plurality of units of the reconfigurable circuit to operate the transceiver in a receive mode or transmit mode.Type: GrantFiled: January 24, 2017Date of Patent: September 25, 2018Assignee: QUALCOMM IncorporatedInventors: Haim Mendel Weissman, Mahim Ranjan
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Patent number: 10075137Abstract: Power amplification system for radio frequency communications, comprising a input port of an input radio frequency signal, an output port of an output radio frequency signal; a digital predistortion unit operatively interposed between the input port and the output port and quadrature modulation correction means operatively interposed between the digital predistortion unit and between at least one of the input port and the output port.Type: GrantFiled: May 22, 2015Date of Patent: September 11, 2018Assignee: Teko Telocom, S.r.l.Inventors: Davide Durante, Massimo Notargiacomo, Giovanni Chiurco, Flavia Martelli
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Patent number: 10075324Abstract: A predistortion processing apparatus: an auxiliary feedback module, configured to: extract a nonlinear distortion signal from an analog signal, and input an obtained feedback signal corresponding to the nonlinear distortion signal into an auxiliary model coefficient training module; the auxiliary model coefficient training module, configured to: train an auxiliary coefficient according to the feedback signal and a predistortion signal, and transmit a first auxiliary coefficient obtained through training to a predistortion processing module; a radio frequency signal feedback module, configured to extract a fundamental wave feedback signal; a predistortion model coefficient training module, configured to: train a predistortion coefficient according to the predistortion signal and the fundamental wave feedback signal, and transmit an obtained predistortion coefficient to the predistortion processing module; the predistortion processing module, configured to: perform predistortion processing on an input intermediType: GrantFiled: May 19, 2017Date of Patent: September 11, 2018Assignee: Huawei Technologies Co., Ltd.Inventors: Yanqing Zhao, Chunlei Yu, Tingjian Tian
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Patent number: 10069659Abstract: Embodiments of a noise-shaping crest factor reduction method for a carrier signal (and a device that performs the method) include (a) clipping the carrier signal by selecting at least one carrier signal peak that has a magnitude exceeding a predetermined crest factor reduction threshold, (b) subtracting the resulting clipped signal from the carrier signal, (c) confining, by a noise shaping filter, the resulting clipping noise signal in a frequency band corresponding to that of the carrier signal, and (d) subtracting the resulting spectrally shaped clipping noise signal from a delayed version of the carrier signal. The confining process includes selecting first sub-areas of the noise shaping filter response at one or more guard bands, selecting at least one second sub-area of the noise shaping filter response elsewhere in the frequency band, and setting the first sub-areas to a first predetermined magnitude higher than the magnitude of the second sub-area.Type: GrantFiled: May 5, 2017Date of Patent: September 4, 2018Assignee: NXP USA, INC.Inventor: Vincent Martinez
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Patent number: 10055372Abstract: Orthogonal differential vector signaling codes are described which support encoded sub-channels allowing transport of distinct data and clocking signals over the same transport medium. Embodiments are described which are suitable for implementation in both conventional high-speed CMOS and DRAM integrated circuit processes.Type: GrantFiled: November 25, 2015Date of Patent: August 21, 2018Assignee: KANDOU LABS, S.A.Inventor: Amin Shokrollahi
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Patent number: 10057096Abstract: A transmitting apparatus according to one aspect of the present disclosure transmits a plurality of first transmission data and a plurality of second transmission data by using an OFDM (Orthogonal Frequency-Division Multiplexing) method. The transmitting apparatus includes frame configuring circuitry, which in operation, generates a frame including a first period in which a preamble is transmitted, a second period in which the plurality of first transmission data is multiplexed by a time division multiplexing method and is transmitted, and a third period in which the plurality of second transmission data is multiplexed by a frequency division multiplexing method and is transmitted; and transmitting circuitry that transmits the frame.Type: GrantFiled: October 17, 2016Date of Patent: August 21, 2018Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICAInventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
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Patent number: 10050816Abstract: A user equipment, apparatus, and method are provided for wireless communication with at least one base station. The user equipment includes a transceiver configured to communicate with the at least one base station by transmitting radio frequency signals to the at least one base station and by receiving radio frequency signals from the at least one base station. The user equipment also includes processing circuitry. The processing circuitry is configured to identify an occupied signal bandwidth of the radio frequency signals. The processing circuitry is also configured to identify a spectral mask for the occupied signal bandwidth. The processing circuitry is also configured to identify an unused available spectrum between the occupied signal bandwidth and the spectral mask. The processing circuitry is also configured to modulate a spectral mask filling (SMF) signal in the unused available spectrum, the SMF signal configured to reduce the peak-to-average power ratio of the radio frequency signals.Type: GrantFiled: March 31, 2015Date of Patent: August 14, 2018Assignee: Samsung Electronics Co., Ltd.Inventors: Sridhar Rajagopal, Shadi Abu-Surra
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Patent number: 10033452Abstract: Provided is a frame configuration usable for both SISO transmission and MISO and/or MIMO transmission. A frame configurator of a transmission device configures a frame by gathering data for SISO and configures a frame by gathering data for MISO and/or MIMO data, thereby to improve the reception performance (detection performance) of a reception device.Type: GrantFiled: July 26, 2017Date of Patent: July 24, 2018Assignee: SUN PATENT TRUSTInventors: Mikihiro Ouchi, Yutaka Murakami, Tomohiro Kimura
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Patent number: 10033445Abstract: A transmission device comprising: a weighting circuity which, in operation, generates transmission signals of n streams (n is an integer of 3 or more) by weighting modulated signals of the n streams using a predetermined fixed precoding matrix; a phase changing circuity which, in operation, regularly changes each phase of a symbol series included in each of the transmission signals of the n streams; and a transmitter which, in operation, transmits the transmission signals of the n streams from different antennas, the phases of each of the transmission signals of the n streams being changed in each symbol, wherein the transmission signal of an i-th stream has an mi kind of phase change value yi(t) (i is an integer between 1 and n (inclusive), 0?yi<2?, and mi is set in each stream, t is an integer of 0 or more, and indicates a symbol slot), and the phase changing circuity changes the phase in one or more u (u=m1×m2× . . .Type: GrantFiled: March 6, 2017Date of Patent: July 24, 2018Assignee: SUN PATENT TRUSTInventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
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Patent number: 10027356Abstract: Devices and methods of compensating for a bandpass filter are generally described. A DTx includes a BPF from which an output signal is produced and a DFE having a zero crossing (ZC) pre-distorter (ZCPD). The ZCPD compensates for ZC distortion from a desired analog signal caused by the BPF. The ZCPD adjusts a DTC code word to generate a DTx output signal to be applied to the BPF. The compensation is dependent on a magnitude of the square wave immediately prior to and after the ZC. The compensated DTC and a DPA code word are used to generate the DTx output signal. The compensation produced by the ZCPD is free from compensation for non-linear responses to the DTC and DPA code words.Type: GrantFiled: September 23, 2016Date of Patent: July 17, 2018Assignee: Intel IP CorporationInventors: Elan Banin, Uri Parker, Ofir Degani, Michael Kerner
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Patent number: 10018707Abstract: A novel methodology for automatically linearizing a harmonic radar transmitter—termed Feed-Forward Filter Reflection (FFFR)—is disclosed. The method combines the reflected second harmonic from a filter with the signal passing directly through the filter. The second harmonic from these two paths are combined with equal and opposite amplitudes to reduce the second harmonic beyond filtering alone. This methodology has been experimentally verified at transmit frequencies between 800 and 1000 MHz. Implemented properly, the technique provides greater than 100 dB rejection between 1.6 and 2.0 GHz. Although the tuning has been automated, further optimization is possible. Automated tuning is demonstrated over 400 MHz of bandwidth with a minimum cancellation of 110 dB. One application for the harmonic cancellation is to create a linear radar transmitter for the remote detection of non-linear targets.Type: GrantFiled: May 4, 2015Date of Patent: July 10, 2018Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Gregory J. Mazzaro, Kyle A. Gallagher
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Patent number: 10003390Abstract: Systems and methods of precoded faster than Nyquist (FTN) signalling are provided. In the transmitter, Tomlinson-Harashima Preceding (THP) is applied to produce precoded symbols. The THP is based on inter-symbol interference (ISI) due to using faster than Nyquist (FTN) signalling. An inverse modulo operation is not performed in the receiver. Instead, in the receiver, FTN processing is performed based on a matched filter output by determining log a-posteriori probability ratio LAPPR values computed for an nth bit bn of a kth received symbol and pre-computed a-priori probabilities of an extended constellation for a given pulse shape h(t) and FTN acceleration factor combination.Type: GrantFiled: November 2, 2016Date of Patent: June 19, 2018Assignee: HUAWEI TECHNOLOGIES CANADA CO., LTD.Inventors: Mrinmoy Jana, Jeebak Mitra, Lutz Hans-Joachim Lampe, Ahmed Mohamed Ibrahim Medra
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Patent number: 10002658Abstract: A highly configurable, extremely dense, high speed and low power artificial neural network is presented. The architecture may utilize DRAM cells for their density and high endurance to store weight and bias values. A number of primary sense amplifiers along with column select lines (CSLs), local data lines (LDLs), and sense circuitry may comprise a single neuron. Since the data in the primary sense amplifiers can be updated with a new row activation, the same hardware can be reused for many different neurons. The result is a large amount of neurons that can be connected by the user. Training can be done in hardware by actively varying weights and monitoring cost. The network can be run and trained at high speed since processing and/or data transfer that needs to be performed can be minimized.Type: GrantFiled: November 2, 2016Date of Patent: June 19, 2018Assignee: Green Mountain Semiconductor Inc.Inventors: Wolfgang Hokenmaier, Ryan A. Jurasek, Donald W. Labrecque
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Patent number: 9985811Abstract: Disclosed herein is an apparatus and methodology for reducing peak-to-average-power ratio (PAPR) for IQ radio frequency digital-to-analog converter (RFDAC). Processing circuitry may be configured to generate a digital signal comprising an in-phase (I) signal component and a quadrature (Q) signal component having a peak-to-average-power-ratio (PAPR). The processing circuitry may determine the I signal component and the Q signal component are higher than a predetermined threshold value, and limit the I signal component and the Q signal component to be less than or equal to the predetermined threshold value. The processing circuitry may rotate the signal components to generate rotated signal components to reduce the PAPR based on the I and Q signal components having less than or equal to the predetermined threshold value, and may generate an output radio frequency (RF) signal based on the rotated signal components.Type: GrantFiled: September 23, 2016Date of Patent: May 29, 2018Assignee: Intel IP CorporationInventors: Christian Mayer, Franz Kuttner
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Patent number: 9985741Abstract: The present invention discloses a method for adjusting parameters of a sending device and a receiving device, and a terminal device. In the method, a new precoding parameter that needs to be used by a sending device on a line when a precoding matrix in a downlink direction of the line changes, and a new signal recovery parameter that needs to be used by a receiving device and matches the new precoding parameter are first acquired; and then the new precoding parameter, the new signal recovery parameter, and a set moment and/or symbol at which the sending device starts to use the new precoding parameter are sent to the sending device, and the new signal recovery parameter and the set moment and/or symbol are sent to the receiving device by using the sending device.Type: GrantFiled: September 15, 2015Date of Patent: May 29, 2018Assignee: Huawei Technologies Co., Ltd.Inventors: Xiang Wang, Weiyang Wang
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Patent number: 9967123Abstract: The disclosure provides a circuit. The circuit includes an IFFT (inverse fast fourier transform) block. The IFFT block generates a modulated signal in response to a data signal. A clip logic block is coupled to the IFFT block, and generates a clipped signal in response to the modulated signal. A first subtractor is coupled to the clip logic block and the IFFT block, and subtracts the modulated signal from the clipped signal to generate an error signal. A cyclic filter is coupled to the first subtractor, and filters the error signal to generate a filtered error signal. A second subtractor is coupled to the cyclic filter and the IFFT block. The second subtractor subtracts the filtered error signal from the modulated signal to generate a processed signal.Type: GrantFiled: February 7, 2017Date of Patent: May 8, 2018Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Jaiganesh Balakrishnan, Sarma Sundareswara Gunturi, Pankaj Gupta, Indu Prathapan
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Patent number: 9966906Abstract: A radio apparatus includes an amplifier that amplifies electrical power of a signal that is wirelessly transmitted, and a processor that executes a process including: performing, by using a distortion compensation coefficient that compensates distortion generated in the amplifier, distortion compensation of an input signal; reading, from a predetermined memory, a threshold that varies in accordance with the electrical power of the input signal; and comparing the read threshold with a monitoring target which includes the distortion compensation coefficient used with respect to the input signal to monitor whether an abnormality is present in the distortion compensation of the input signal.Type: GrantFiled: April 25, 2017Date of Patent: May 8, 2018Assignee: FUJITSU LIMITEDInventors: Akihiko Komatsuzaki, Satoshi Matsubara, Shinichiro Kobayashi, Hideharu Shako
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Patent number: 9960900Abstract: Methods and apparatus are provided for modeling of a physical system using two-dimensional look-up tables.Type: GrantFiled: March 31, 2014Date of Patent: May 1, 2018Assignee: Intel CorporationInventor: Kameran Azadet
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Patent number: 9960942Abstract: The invention relates to a method for reducing the PAPR in FRFT-OFDM systems, which belongs to the field of broadband wireless digital communications technology. The method is based on fractional random phase sequence and fractional circular convolution theorem, which can effectively reduce the PAPR of the system. The method of the invention has the advantages of simple system implementation and low computational complexity. In this method, the PAPR of the system can be effectively reduced while maintaining the reliability of the system. When the number of candidate signals is the same, the PAPR performance of the present method was found to be almost the same as that of SLM and better than that of PTS. More importantly, the present method has lower computational complexity than that of SLM and PTS methods.Type: GrantFiled: January 9, 2017Date of Patent: May 1, 2018Assignee: Beijing Institute of TechnologyInventors: Hao Huan, Ran Tao, Yue Zhao, Teng Wang
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Patent number: 9954626Abstract: A method of calibrating parameters for a polar transmitter (Polar TX) system includes receiving phase information derived from transmission information in a Polar TX for producing a radio frequency (RF) broadcast signal. An Inphase local oscillator (LO_I) signal and a quadrature phase local oscillator (LO_Q) signal are derived from a combination of a first signal and the phase information using a digital phase lock loop. A feedback receiver (FBR) receives the RF broadcast signal provided by the Polar TX. The LO_I signal and the LO_Q signal are mixed with the RF broadcast signal to obtain mixer output signals. RF path delay and IQ phase imbalance are concurrently determined as a function of the first signal and of the mixer output signals.Type: GrantFiled: August 8, 2016Date of Patent: April 24, 2018Assignee: Intel IP CorporationInventors: Alexander Belitzer, Bernhard Sogl
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Patent number: 9923595Abstract: A signal processing circuit arrangement may include a preamplifier circuit configured to map a first dimension input and a second dimension input to a first subset of a plurality of lookup table coefficients of a two-dimensional (2D) lookup table, wherein the first dimension input and the second dimension input each represent a signal level of one or more input signals, extrapolate from the first subset of the plurality of lookup table coefficients to generate a lookup table output, and apply the lookup table output to the one or more input signals to generate a predistorted input signal for an amplifier.Type: GrantFiled: June 24, 2016Date of Patent: March 20, 2018Assignee: Intel CorporationInventors: Albert Molina, Kameran Azadet
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Patent number: 9923582Abstract: A high-frequency signal predistortion device includes a high-frequency signal estimator, a predistortion estimator, and a predistorter. The high-frequency signal estimator is configured to determine non-linear distortion characteristics of high-frequency signals transmitted by antennas. The predistortion estimator is coupled to the high-frequency signal estimator. The predistortion estimator is configured to determine a predistortion coefficient based on the non-linear distortion characteristics. The predistorter is coupled to the predistortion estimator. The predistorter is configured to distort a base signal of the high-frequency signals based on the predistortion coefficient.Type: GrantFiled: September 14, 2016Date of Patent: March 20, 2018Assignees: Samsung Electro-Mechanics Co., Ltd., Korea Advanced Institute of Science and TechnologyInventors: Yong Hoon Lee, Sang Il Lee, Min Hyun Kim, Young Wook Sirl, Eui Rim Jeong, Soon Il Hong, Jong Ok Ha, Seong Jin Kim
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Patent number: 9906428Abstract: A method and apparatus is provided. The method includes determining a training data set comprising input and output data of a power amplifier, determining compensation data by regressing the training data using a frequency domain weighting function, storing the compensation data, and linearizing an output of the power amplifier using the stored compensation data.Type: GrantFiled: June 23, 2016Date of Patent: February 27, 2018Assignee: Samsung Electronics Co., Ltd.Inventors: Jaeyoung Kim, Pranav Dayal, Jungwon Lee
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Patent number: 9876516Abstract: A method of suppressing interference in a communication sent over a channel includes assessing characteristics of channel-induced distortion in a channel, and applying pre-distortion to a signal sent over the channel. The pre-distortion is based on the assessed characteristics of the channel-induced distortion.Type: GrantFiled: August 2, 2012Date of Patent: January 23, 2018Assignee: Texas State University—San MarcosInventor: Stan McClellan
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Patent number: 9866327Abstract: Since a sampling frequency of RRU is always constant, A/D conversion may be performed with a sampling frequency higher than necessary with respect to a frequency band width of a radio signal. A sampling frequency change function, and the sampling frequency is reduced in a range where a aliasing component does not deteriorate signal quality of a desired signal component when the sampling frequency is decreased, based on radio band allocation information, or signal transmission between BBU and RRU is stopped in a no signal section, whereby a band required for digital RoF transmission between the BBU and the RRU is reduced.Type: GrantFiled: October 10, 2013Date of Patent: January 9, 2018Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Naotaka Shibata, Seiji Yoshida, Shigeru Kuwano, Jun-ichi Kani, Jun Terada
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Patent number: 9866246Abstract: A digital transmitter channel optimization device can be employed within or in conjunction with a transmitter to perform a number of techniques in the digital domain to account for distortion introduced in the transmitter. The optimization device can be configured to perform such techniques on an arbitrary signal to thereby allow the optimization device to be used with virtually any transmitter. The optimization device may be particularly beneficial in wideband systems where accounting for distortion can be difficult to accomplish using existing techniques.Type: GrantFiled: August 25, 2016Date of Patent: January 9, 2018Assignee: L-3 Communications Corp.Inventors: June Y Sun, William K McIntire
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Patent number: 9866303Abstract: The present invention relates to a wireless communication system and, more specifically, to a method and device for reporting channel state information (CSI). The method by which a terminal in a wireless communication system reports CSI, according to one embodiment of the present invention, can comprise the steps of: receiving a reference signal from a base station; and reporting, to the base station, the CSI generated by using the reference signal. The CSI can include at least one first domain precoding matrix indicator (PMI) indicating a first precoding matrix for a first domain of a two-dimensional antenna structure and at least one second domain PMI indicating a second precoding matrix for a second domain of the two-dimensional antenna structure. A reporting period of the at least one first domain PMI can be shorter than a reporting period of the at least one second domain PMI.Type: GrantFiled: March 11, 2014Date of Patent: January 9, 2018Assignee: LG ELECTRONICS INC.Inventors: Hyunsoo Ko, Jiwon Kang, Jaehoon Chung
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Patent number: 9866269Abstract: A digital predistortion (DPD) system includes an input configured to receive a DPD input signal. The DPD system includes a first predistortion circuit configured to provide a first signal path coupled to the input to generate a first predistortion signal. The first predistortion circuit includes a first infinite impulse response (IIR) filter. A second predistortion circuit is configured to provide a second signal path coupled to the input in parallel with the first signal path to generate a second predistortion signal. The second predistortion circuit includes a second IIR filter. A combiner circuit is configured to combine the first predistortion signal and the second predistortion signal to generate a DPD output signal.Type: GrantFiled: November 17, 2016Date of Patent: January 9, 2018Assignee: XILINX, INC.Inventors: Hongzhi Zhao, Christopher H. Dick, Hemang M. Parekh
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Patent number: 9859946Abstract: Certain aspects and aspects of the present invention are directed to a distributed antenna system having a downlink communication path, an uplink communication path, and a non-duplexer isolator sub-system. The downlink communication path can communicatively couple a transmit antenna to a base station. The uplink communication path can communicatively couple a receive antenna to the base station. In one aspect, the non-duplexer isolator sub-system can be electronically configured for isolating uplink signals traversing the uplink communication path from downlink signals. In another aspect, a non-duplexer isolator sub-system can be configurable in one or more mechanical steps selecting a frequency response. In another aspect, a non-duplexer isolator sub-system can include an active mitigation sub-system.Type: GrantFiled: June 17, 2015Date of Patent: January 2, 2018Assignee: CommScope Technologies LLCInventors: Charles B. Morrison, Donald R. McAllister, Fred W. Phillips, Christopher G. Ranson, Van E. Hanson, Thomas Kummetz, Gregory Allan Maca
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Patent number: 9819318Abstract: Systems and methods for compensating for non-linearity of a non-linear subsystem using predistortion are disclosed. In one embodiment, a system includes a non-linear subsystem and a predistorter configured to effect predistortion of an input signal of the non-linear subsystem such that the predistortion compensates for a non-linear characteristic of the non-linear subsystem. In addition, the system includes a narrowband filter that filters a feedback signal that is representative of an output signal of the non-linear subsystem to provide a filtered feedback signal, and an adaptor that adaptively configures the predistorter based on the filtered feedback signal and a reference signal that is representative of an input signal of the non-linear subsystem. By utilizing the filtered feedback signal, rather than the feedback signal, a complexity, and therefore, cost of the adaptor is substantially reduced.Type: GrantFiled: December 21, 2011Date of Patent: November 14, 2017Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Chunlong Bai, Chunyun Jian, Edward Sich
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Patent number: 9813105Abstract: Certain aspects and aspects of the present invention are directed to a distributed antenna system having a downlink communication path, an uplink communication path, and a non-duplexer isolator sub-system. The downlink communication path can communicatively couple a transmit antenna to a base station. The uplink communication path can communicatively couple a receive antenna to the base station. In one aspect, the non-duplexer isolator sub-system can be electronically configured for isolating uplink signals traversing the uplink communication path from downlink signals. In another aspect, a non-duplexer isolator sub-system can be configurable in one or more mechanical steps selecting a frequency response. In another aspect, a non-duplexer isolator sub-system can include an active mitigation sub-system.Type: GrantFiled: June 17, 2015Date of Patent: November 7, 2017Assignee: CommScope Technologies LLCInventors: Charles B. Morrison, Donald R. McAllister, Fred W. Phillips, Christopher G. Ranson, Van E. Hanson, Thomas Kummetz, Gregory Allan Maca
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Patent number: 9813190Abstract: Described herein are technologies related to an implementation of a closed-loop system to measure and compensate non-linearity in a transceiver circuitry of a device.Type: GrantFiled: July 1, 2016Date of Patent: November 7, 2017Assignee: Intel IP CorporationInventors: Ilan Sutskover, Roy Nahum, Yuval Dafna, Ran Shimon, Tzahi Weisman, Roy Amel
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Patent number: 9800206Abstract: Methods and apparatus for detection and tracking of a signal envelope. The circuit comprises absolute value circuitry configured to receive data samples and output a first value corresponding to the magnitude of said data samples. An envelope tracker maintains an envelope output value and compares the first value to the current envelope output value and modifies the envelope output value based on said comparison to provide the envelope output value with predetermined attack and decay characteristics. The absolute value circuitry has a first input for receiving a first digital signal at a first sample rate and a second input for receiving an interpolated version of the first digital signal at a second sample rate which is higher than the first sample rate and outputs the first value based on the magnitudes of the samples received at the first input and the samples received at the second input.Type: GrantFiled: May 26, 2016Date of Patent: October 24, 2017Assignee: Cirrus Logic, Inc.Inventors: Malcolm Blyth, Graeme Gordon Mackay
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Patent number: 9794099Abstract: Embodiments of the present invention disclose a sending apparatus and a receiving apparatus, and a method for sending a physical layer signal, includes: constructing a signal with a frame structure comprising multiple Ga128 sequences, a —Ga128 sequence, and a single-frequency sequence of M in length; wherein the Ga128 and —Ga128 sequences are Golay sequences of 128 in length, M is an integer multiple of 128, and the single-frequency sequence comprises M single-frequency symbols and is used to enable a receiving apparatus to estimate an Inphase and Quadrature (IQ) imbalance parameter; and sending the signal with the frame structure.Type: GrantFiled: September 6, 2016Date of Patent: October 17, 2017Assignees: Huawei Technologies Co., Ltd., Tsinghua UniversityInventors: Zhenyu Xiao, Changming Zhang, Pei Liu
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Patent number: 9794105Abstract: A signal transmitting apparatus includes: a first converting device arranged to generate an up-converted in-phase signal according to an in-phase digital signal and a first pre-distortion signal; a second converting device arranged to generate an up-converted quadrature signal according to a quadrature digital signal and a second pre-distortion signal; an amplifying device arranged to generate an amplified signal according to the up-converted in-phase signal and the up-converted quadrature signal; and a processing device arranged to generate the first pre-distortion signal according to a first combination signal combined by a cube of the in-phase digital signal and a multiplication of the in-phase digital signal and a square of the quadrature digital signal, and to generate the second pre-distortion signal according to a second combination signal combined by a cube of the quadrature digital signal and a multiplication of the quadrature digital signal and a square of the in-phase digital signal.Type: GrantFiled: January 16, 2015Date of Patent: October 17, 2017Assignee: MediaTek Singapore Pte. Ltd.Inventors: Hsin-Hung Chen, Manel Collados Asensio, Wei-Kai Chang, Qian-Zhi Huang, Chi-Tsan Chen, Jun Hu
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Patent number: 9781747Abstract: A method for transmitting a random access preamble at a user equipment in a wireless communication system is disclosed. The method includes determining a random access sequence transmission period using a random access sequence, configuring a random access preamble by inserting a cyclic prefix at a front of the random access sequence transmission period and a guard time at an end of the random access sequence transmission period, and transmitting the random access preamble on a random access channel to a base station. The random access preamble is configured by repeating the random access sequence a predetermined number of times, if the length of the random access sequence is smaller than the random access sequence transmission period.Type: GrantFiled: August 20, 2013Date of Patent: October 3, 2017Assignee: LG ELECTRONICS INC.Inventors: Kitae Kim, Jinmin Kim, Hyunsoo Ko, Jaehoon Chung
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Patent number: 9768891Abstract: A distortion compensation device includes a multiplier, a subtracter, an LUT, and a distortion compensation unit. The multiplier calculates the product of amplitudes or the product of power of transmission signals at two different times or calculates the ratio of amplitudes or the ratio of power of transmission signals at two different times. The subtracter calculates the phase difference between the transmission signals at two different times. The LUT specifies a distortion compensation coefficient by using both the product or the ratio calculated by the multiplier and the phase difference calculated by the subtracter. The distortion compensation unit performs, by using the distortion compensation coefficient specified by the LUT, a predistortion process on the transmission signal that is input to the amplifier.Type: GrantFiled: November 15, 2016Date of Patent: September 19, 2017Assignee: FUJITSU LIMITEDInventors: Hiroyoshi Ishikawa, Tomoya Ota, Kazuo Nagatani
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Patent number: 9769834Abstract: Interference may be detected in a cellular network by receiving signals at a target base station in a quiet resource block in which no uplink transmissions to the target base station are scheduled to occur, identifying a plurality of user equipment attached to base stations neighboring a target base station as interfering user equipment, reconstructing signals transmitted by the interfering user equipment, removing the reconstructed signals from the signals received by the target base station in the quiet resource block, and determining interference in the signals from which the reconstructed signals are removed. Detected interference data can be used to create an interference cancelling receiver.Type: GrantFiled: September 10, 2013Date of Patent: September 19, 2017Assignee: SPECTRUM EFFECT, INC.Inventors: Chaz Immendorf, Rekha Menon, Eamonn Gormley
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Patent number: 9763222Abstract: A mobile terminal including a display; a wireless communication processor configured to transceive a message with an external device; and a controller configured to display a message interface including a plurality of messages transceived with the external device on the display, and in response to a message change condition indicating a change in a respective message among the plurality of messages transceived with the external device, update and display without user interaction the message interface to indicate the change to the respective message.Type: GrantFiled: January 28, 2016Date of Patent: September 12, 2017Assignee: LG ELECTRONICS INC.Inventors: Yoonseok Yang, Yunmi Kwon, Yeonsuk Na, Sungjin Kang, Juha Hyun, Shinnyue Kang, Seulah Lee
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Patent number: 9749161Abstract: A predistortion method and apparatus are provided which use a DPD actuator (225) to apply a memory polynomial formed with first DPD coefficients to a first input signal x[n], thereby generating a first pre-distorted input signal y[n] which is provided to the non-linear electronic device (253) to produce the output signal, where the memory polynomial may be adaptively modified with a digital predistortion adapter (224) which computes second DPD coefficients u[n] with an iterative fixed-point conjugate gradient method which uses N received digital samples of the first pre-distorted input signal y[n] and a feedback signal z[n] captured from the output signal to process a set of conjugate gradient parameters (u, b, v, r, ?, ?, ?) at each predetermined interval, thereby updating the first DPD coefficients with the second DPD coefficients u[n] generate a second pre-distorted input signal which is provided to the non-linear electronic device.Type: GrantFiled: February 23, 2016Date of Patent: August 29, 2017Assignee: NXP USA, Inc.Inventors: Avraham D. Gal, Roi M. Shor, Igor Levakov
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Patent number: 9729120Abstract: An audio loudness data collection module collects and stores audio data. The data can be stored for a first time period. A monitoring system can access and store the audio data collected and stored by the loudness data collection module according to a second time period. The stored audio data can be processed and displayed to a user in a number of ways. The data can also be used to provide loudness data control. For example, a loudness data control module can perform an audio AGC function to control audio loudness.Type: GrantFiled: July 13, 2011Date of Patent: August 8, 2017Assignee: The DIRECTV Group, Inc.Inventors: Kevin S. Culwell, Daniel M. Miner, Heather N. Truong, Uy X. Nguyen, Leon J. Stanger, James A. Michener
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Patent number: 9722843Abstract: A system comprises an analog front end (AFE), an analog-to-digital converter (ADC), and alias detection circuitry. The AFE may be operable to receive an analog signal via a communication medium, wherein a first frequency band of the analog signal is occupied by an OFDM symbol and a second frequency band of the analog signal is occupied by first aliases generated during digital-to-analog conversion of the OFDM symbol. The ADC is operable to digitize the particular band of the analog signal to generate a digital signal, wherein, during the digitization, aliasing of the first aliases results in second aliases which fall into the first frequency band. The alias detection circuitry is operable to detect the second aliases in the first frequency band of the digital signal, and process the digital signal based on the detected second aliases to generate an output signal.Type: GrantFiled: March 24, 2016Date of Patent: August 1, 2017Assignee: Maxlinear, Inc.Inventor: Curtis Ling