Antinoise Or Distortion (includes Predistortion) Patents (Class 375/296)
  • Patent number: 11025203
    Abstract: The inventive concept relates to a communication device comprising a DPD processor configured to output a plurality of pre-distorted signals by pre-distorting each of a plurality of input signals using an extracted feedback signal, a first signal combiner configured to combine a plurality of feedback signals corresponding to the plurality of pre-distorted signals and output a combined feedback signal, an analog-to-digital converter configured to convert the combined feedback signal into a digital signal and output a digital-converted combined feedback signal and a signal extractor configured to extract the digital-converted combined feedback signal and output the extracted feedback signal.
    Type: Grant
    Filed: July 31, 2020
    Date of Patent: June 1, 2021
    Assignee: SOLiD, INC.
    Inventors: Kwangnam Seo, Doyoon Kim, Hyoungho Kim, Daesung Baek
  • Patent number: 10998950
    Abstract: A method for receiving Channel State Information (CSI) by a base station (BS) in a wireless communication system, includes receiving an encoded value for a specific CSI report mode, wherein the encoded value is joint encoded value of a rank indicator (RI) and a first precoding matrix indicator (PMI), obtaining the RI and a codebook index for the first PMI based on the encoded value, wherein the RI and the first PMI are jointly encoded into the encoded value in a way that following conditions are satisfied: when the encoded value is an integer ranging from 0 to 7, the RI is 1 and a codebook index for the first PMI is same as the encoded value, and when the encoded value is integer ranging from 8 to 15, the RI is 2 and the codebook index for the first PMI is the encoded value minus 8.
    Type: Grant
    Filed: October 4, 2019
    Date of Patent: May 4, 2021
    Assignee: LG ELECTRONICS INC.
    Inventors: Hyungtae Kim, Hanjun Park
  • Patent number: 10972326
    Abstract: Disclosed are methods, systems, devices, apparatus, media, design structures, and other implementations, including a method that includes receiving a signal for radio transmission, and configuring crest factor reduction (CFR) processing characteristics, at a wireless device, to apply to the received signal to modify one or more portions of the signal based on an asymmetrical spectral mask, representative of an asymmetric frequency envelope limiting allowed magnitudes for frequency components bounded by the asymmetrical spectral mask, with the asymmetrical spectral mask being defined based on spectral characteristics requirements specified by multiple regulatory radio frequency (RF) power requirements at frequencies affecting a frequency range of the asymmetrical spectral mask.
    Type: Grant
    Filed: March 5, 2020
    Date of Patent: April 6, 2021
    Assignee: NanoSemi, Inc.
    Inventors: Alexandre Megretski, Zohaib Mahmood, Helen H. Kim, Andrew Feldman
  • Patent number: 10951249
    Abstract: A transmit circuit operated with time-interpolated digital pre-distortion (DPD) coefficients to improve adjacent channel power ratio (ACPR) performance during a power mode change is provided. The transmit circuit includes a DPD circuit configured to operate with a first DPD coefficient according to a first transmit power level of a transmit power amplifier of the transmit circuit. The transmit circuit further includes a DPD coefficient management engine configured to retrieve a second DPD coefficient corresponding to the second transmit power level. The transmit circuit further includes a DPD coefficient time-interpolation engine configured to compute a set of time-interpolated DPD coefficients corresponding to a set of time instants for a transient period when the transmit power amplifier is adapted to the second DPD coefficient.
    Type: Grant
    Filed: March 26, 2020
    Date of Patent: March 16, 2021
    Assignee: Xilinx, Inc.
    Inventors: Hongzhi Zhao, Vince C Barnes, Xiaohan Chen, Hemang Parekh
  • Patent number: 10944606
    Abstract: A method and system for error scaling for crest factor reduction (CFR) are disclosed. According to one aspect, a method for regulating peak to average power ratio (PAR) of an output signal of the CFR circuit is disclosed. In one embodiment, the method includes receiving an input signal at an input of the CFR circuit. The magnitude of the input signal is determined and clipped to a target level to produce an error signal by comparing the input signal magnitude to a threshold in a comparator. The error signal is filtered to produce a processed error signal. The filter provides a bandpass filter frequency response. The PAR of the output signal is regulated by scaling the processed error signal by an error scaling factor to achieve a target signal to noise ratio (SNR) for the output signal corresponding to a target error vector magnitude (EVM).
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: March 9, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Pierre-Andre Laporte
  • Patent number: 10939384
    Abstract: A power control method, including receiving indication information, where the indication information indicates a power control parameter specific to a bandwidth part, and sending uplink information on the bandwidth part by using a transmit power, where the transmit power is based on the power control parameter specific to the bandwidth part and is further based on a common power control parameter of a carrier in which the bandwidth part is disposed.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: March 2, 2021
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Junchao Li, Yafei Wang, Hao Tang, Zhenfei Tang
  • Patent number: 10939389
    Abstract: Network nodes, wireless devices and methods of reducing signaling overhead are provided. In one embodiment, a method includes transmitting to the wireless device at least one power threshold parameter to be used by the wireless device to determine a number of beams to be included in a multi-beam precoder codebook and transmitting to the wireless device a signal to interference plus noise ratio (SINR) to be used by the wireless device to determine to use one of a single beam precoder and a multiple beam precoder.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: March 2, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Siva Muruganathan, Sebastian Faxér, Shiwei Gao, Stephen Grant, Robert Mark Harrison
  • Patent number: 10924174
    Abstract: A precoding matrix indication method relating to the field of wireless communications technologies, an apparatus, and a system that are in a wireless communications system are provided. A combination of a plurality of stages of codebooks and a corresponding PMI feedback method are further provided. User equipment receives indication information sent by a network device, where the indication information includes information about codebooks used to report precoding matrix indicators (PMI), the information about the codebooks indicates that the used codebooks are at least two of a first codebook to an Nth codebook, the PMIs include at least two of a first PMI to an Nth PMI, and the first PMI to the Nth PMI are respectively used to indicate a precoding matrix in the first codebook to a precoding matrix in the Nth codebook; and sends the PMIs based on the indication information.
    Type: Grant
    Filed: May 2, 2019
    Date of Patent: February 16, 2021
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yi Huang, Haibao Ren, Shengyue Dou, Yuanjie Li
  • Patent number: 10911195
    Abstract: Disclosed is a method for uplink transmission and reception in a wireless communication system and an apparatus therefor. Particularly, a method for performing uplink transmission by a user equipment (UE) in a wireless communication system includes: receiving sounding reference signal (SRS) resource configuration information form a base station, in which the SRS resource configuration information includes SRS resource information and association configuration information between a first SRS and a second SRS that is a target of the SRS resource configuration information; and transmitting precoded the second SRS to the base station on an SRS resource indicated by the SRS resource information, and the second SRS may be transmitted based on the precoding applied to the first SRS indicated by the association configuration information.
    Type: Grant
    Filed: January 8, 2018
    Date of Patent: February 2, 2021
    Assignee: LG Electronics Inc.
    Inventors: Jonghyun Park, Kijun Kim, Jiwon Kang, Haewook Park, Minki Ahn, Sangrim Lee
  • Patent number: 10911162
    Abstract: A MIMO transceiver may include a communication chain configured to generate a signal at a first frequency. The communication chain may include a pre-distorter configured to accept pre-distortion parameters to pre-distort signals. The communication chain may include a PA to amplify the signals. The MIMO transceiver may include a DPD chain configured to receive the signal at the first frequency. The DPD chain may include a data converter to sample the signal using a sampling rate based on a baseband frequency. The data converter may be configured to generate a sample signal based on the sampling of the signal. The DPD chain may include a buffer configured to buffer the sample signal. The MIMO transceiver may include a DPD circuit configured to calibrate the pre-distortion parameters calibrated based on the buffered sample signal to compensate for non-linearity in amplification provided by the PA of the communication chain.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: February 2, 2021
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Abhishek Kumar Agrawal, Hossein Dehghan
  • Patent number: 10904060
    Abstract: A peak suppression circuit includes a memory, and a processor coupled to the memory and the processor configured to suppress a first peak of a transmission signal according to a first sampling signal having a predetermined period, delay the transmission signal where the first peak is suppressed by a predetermined time corresponding to a period shorter than the predetermined period, and suppress a second peak of the delayed transmission signal according to a second sampling signal having the predetermined period.
    Type: Grant
    Filed: August 1, 2019
    Date of Patent: January 26, 2021
    Assignee: FUJITSU LIMITED
    Inventors: Hiroyoshi Ishikawa, Shinichiro Kobayashi
  • Patent number: 10892788
    Abstract: A method and a transmitter arrangement for cancelling cross talk and correcting power amplifier (PA) distortion for a transmitter branch of a multiple-input multiple-output (MIMO) configuration having multiple branches. The method comprises combining an original baseband input signal of a first MIMO transmitter branch with a crosstalk output signal generated from two or more signals associated with two or more respective MIMO branches, the two or more signals used as input to, and processed by, a crosstalk model. The method further comprises processing the combined signal to generate an output signal in order to minimize the error of the original baseband input signal caused by the crosstalk and/or PA distortion.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: January 12, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Haiying Cao, Spendim Dalipi, Per Landin
  • Patent number: 10892786
    Abstract: An apparatus that implements DPD in a manner that can address OOB instability issues, PE instability issues, or both, is disclosed. The apparatus includes an actuator circuit configured to use a model of a power amplifier (PA) to apply a predistortion to at least a portion of an input signal, and an error correction circuit configured to generate an error signal indicative of a deviation of the output of the actuator circuit from the target output, e.g., in terms of OOB or PE. The apparatus also includes an adaptation circuit configured to update the model based on the error signal. By using such an error in adapting the model used for the DPD, undesirable effects of performing DPD, such as creation or amplification of OOB frequency components, or increasing amplitude of some samples, may be reduced or eliminated.
    Type: Grant
    Filed: October 17, 2019
    Date of Patent: January 12, 2021
    Assignee: ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANY
    Inventors: Patrick Pratt, David Jennings
  • Patent number: 10893490
    Abstract: Network nodes, wireless devices and methods of reducing signaling overhead are provided. In one embodiment, a method includes transmitting to the wireless device at least one power threshold parameter to be used by the wireless device to determine a number of beams to be included in a multi-beam precoder codebook and transmitting to the wireless device a signal to interference plus noise ratio (SINR) to be used by the wireless device to determine to use one of a single beam precoder and a multiple beam precoder.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: January 12, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Siva Muruganathan, Sebastian Faxér, Shiwei Gao, Stephen Grant, Robert Mark Harrison
  • Patent number: 10887079
    Abstract: Digital predistortion (DPD) timing alignment in a remote unit(s) for a wireless communications system (WCS) is disclosed. In examples discussed herein, a remote unit includes a power amplifier (PA) configured to amplify a radio frequency (RF) signal before transmission. The RF signal may include an unwanted distortion term and a DPD circuit is provided in the remote unit to create an artificial distortion term to help cancel out the unwanted distortion term. The remote unit includes a DPD front-end circuit configured to generate a digital training signal corresponding to a predefined waveform pattern. The DPD circuit can be configured to perform a DPD timing alignment based on the predefined waveform pattern to determine a timing offset that is need to create the artificial distortion term. As such, it may be possible to effectively cancel the unwanted distortion term in the RF signal to improve efficiency and linearity of the PA.
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: January 5, 2021
    Assignee: Corning Research & Development Corporation
    Inventors: Nir Geron, Roi Yosy Ziv
  • Patent number: 10879971
    Abstract: Disclosed are methods and apparatuses for transmitting coding indication information and determining a pre-coding matrix, for use in resolving the problem that the resolution of code words in a codebook generated by using a combination of a beam vector subgroup and column selection cannot be flexibly adjusted.
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: December 29, 2020
    Assignee: China Academy of Telecommunications Technology
    Inventors: Hui Li, Qiubin Gao, Runhua Chen, Wenhong Chen, Tamrakar Rakesh
  • Patent number: 10873522
    Abstract: An apparatus and method for testing an upstream path of a cable network are disclosed. The upstream path is tested by capturing and analyzing upstream data packets generated by a specific terminal device. A test instrument is connected at a node of the cable network. The test instrument establishes a communication session with the headend, informing the headend of an identifier of the device that will generate the test upstream data packet. The test upstream data packet is captured and analyzed at the headend, so that the results of the analysis can be communicated back to the test instrument. To speed up the packet capturing and filtering process, the upstream data packets can be pre-filtered based on packet duration and/or arrival time.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: December 22, 2020
    Assignee: VIAVI SOLUTIONS INC.
    Inventors: Michael D. Gotwals, David W. Jones
  • Patent number: 10862516
    Abstract: A digital pre-distortion circuit and a digital pre-distortion method are provided. In the method, pre-distortion, digital-to-analog conversion and an amplifying process are performed on an input signal in sequence, to generate an output signal. A first bandwidth of the input signal after the pre-distortion is greater than a second bandwidth of the input signal after the digital-to-analog conversion. Signals outside the second bandwidth are filtered out from the output signal, to generate a second output signal. A third output signal, which is a signal after a pre-distorted signal is amplified, is estimated according to the pre-distorted signal and the second output signal. The pre-distorted signal is a signal after the pre-distortion is performed on the input signal. A third bandwidth of the third output signal is greater than the second bandwidth. Parameters of the pre-distortion can be determined according to the third output signal and the pre-distorted signal.
    Type: Grant
    Filed: September 24, 2019
    Date of Patent: December 8, 2020
    Assignee: Sercomm Corporation
    Inventors: Kun-Lin Chiang, Jia-Ming Chen
  • Patent number: 10826741
    Abstract: Adjacent channel leakage-power ratio (ACLR) can be reduced at a transmitter of a device. A modulated signal can be mapped into a plurality of tone sets in a frequency domain, wherein the plurality of tone sets include a first, a second, and a third set of tones. The first and the third set of tones can be converted in the frequency domain to a fourth and a fifth set of tones, respectively, in a time domain. A zero padding of one or more symbols associated with the fourth and the fifth set of tones can be performed to output a sixth and a seventh set of tones, respectively. The sixth and the seventh set of tones can be converted to an eighth and a ninth set of tones, respectively, in the frequency domain. The eighth and the ninth set of tones can be processed for transmitting to another wireless device.
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: November 3, 2020
    Assignee: QUALCOMM Incorporated
    Inventors: Seyong Park, Peter Gaal, Yi Huang, Renqiu Wang, Hao Xu, Tao Luo
  • Patent number: 10826745
    Abstract: Embodiments are provided for guard band utilization for synchronous and asynchronous communications in wireless networks. A user equipment (UE) or a network component transmits symbols on data bands assigned for primary communications. The data bands are separated by a guard band having smaller bandwidth than the data bands. The UE or network component further modulates symbols for secondary communications with a spectrally contained wave form, which has a smaller bandwidth than the guard band. The spectrally contained wave form is achieved with orthogonal frequency-division multiplexing (OFDM) modulation or with joint OFDM and Offset Quadrature Amplitude Modulation (OQAM) modulation. The modulated symbols for the secondary communications are transmitted within the guard band.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: November 3, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Usa Vilaipornsawai, Javad Abdoli, Jianglei Ma, Ming Jia
  • Patent number: 10819554
    Abstract: A polar transmitter and method thereof generate a filtered IQ waveform in IQ space representing an input bit stream. The filtered IQ waveform is modified to avoid a zero crossing region by intermittently adding thereto a zero crossing avoidance signal with a frequency spectrum comprising at least first and second tones defining first and second peaks on opposite sides of a center-frequency valley. A polar signal comprising a polar amplitude and phase is generated based on the modified IQ waveform. An RF carrier is modulated using the polar signal.
    Type: Grant
    Filed: November 18, 2019
    Date of Patent: October 27, 2020
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Jacob Christopher Sharpe
  • Patent number: 10819408
    Abstract: Disclosed is a method for uplink transmission and reception in a wireless communication system and an apparatus therefor. Specifically, a method for performing uplink transmission by a user equipment (UE) in a wireless communication system may comprise the steps of: receiving downlink control information (DCI) including sounding reference signal (SRS) resource indication (SRI) and precoding indication from a base station; and transmitting an uplink to the base station by applying precoding indicated by the precoding indication on an antenna port of an SRS transmitted within an SRS resource selected by the SRI.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: October 27, 2020
    Assignee: LG Electronics Inc.
    Inventors: Jonghyun Park, Jiwon Kang, Kijun Kim, Haewook Park
  • Patent number: 10819405
    Abstract: A method for managing beam squint in a phased antenna array system operating at millimeter wavelengths using carrier aggregation includes determining a minimum array gain threshold, determining an upper bound for a fractional bandwidth for a fixed number of antennas, and constructing a codebook with a predetermined coverage range based on at least one of an angle of arrival or an angle of departure and further based on the upper bound. The method further includes performing carrier aggregation for the fixed number of antennas and selecting at least two antennas based on the codebook.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: October 27, 2020
    Assignee: University of Notre Dame du Lac
    Inventors: Mingming Cai, J. Nicholas Laneman, Bertrand Hochwald
  • Patent number: 10819407
    Abstract: Disclosed is a method for uplink transmission and reception in a wireless communication system and an apparatus therefor. Specifically, a method for performing uplink transmission by a user equipment (UE) in a wireless communication system may comprise the steps of: receiving downlink control information (DCI) including sounding reference signal (SRS) resource indication (SRI) and precoding indication from a base station; and transmitting an uplink to the base station by applying precoding indicated by the precoding indication on an antenna port of an SRS transmitted within an SRS resource selected by the SRI.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: October 27, 2020
    Assignee: LG Electronics Inc.
    Inventors: Jonghyun Park, Jiwon Kang, Kijun Kim, Haewook Park
  • Patent number: 10812215
    Abstract: Embodiments of the present disclosure provide a data transmission method, including: performing polar code coding on to-be-coded bits, to obtain a mother code, where a code length of the mother code is related to K and Mi, i=1, 2, . . . , K, K is a quantity of sending times, Mi is a length of bits sent at an ith time, and K and Mi are positive integers greater than 1; performing rate matching on the mother code, to obtain to-be-sent bits, where a quantity of the to-be-sent bits is a sum of lengths of bits sent at K times; and sending Mi to-be-sent bits at the ith time.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: October 20, 2020
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Ying Chen, Hejia Luo, Rong Li
  • Patent number: 10797929
    Abstract: A method is disclosed of generating a frequency shift keying (FSK) signal comprised in an orthogonal frequency division multiplexing (OFDM) signal comprising a plurality of sub-carriers. The FSK signal comprises FSK symbols wherein each FSK symbol has a corresponding FSK symbol frequency. The method comprises assigning a set of adjacent sub-carriers to transmission of the FSK signal (wherein the set is a sub-set of the plurality of sub-carriers), and associating each FSK symbol frequency with a corresponding sub-carrier in the set of adjacent sub-carriers. The method also comprises selecting, for each FSK symbol to be transmitted, an FSK symbol phase such that an FSK signal phase at a start of the FSK symbol to be transmitted meets a phase difference criterion in relation to the FSK signal phase at an end of an immediately previous FSK symbol.
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: October 6, 2020
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
    Inventors: Leif Wilhelmsson, Miguel Lopez
  • Patent number: 10797757
    Abstract: An RF system using amplitude modulation (AM) with orthogonal offset is disclosed. The orthogonal offset generator can shift the AM signal trajectory away from the origin while maintaining the time domain requirements for an RFID signal, such as waveform edge rise and fall times. In some embodiments stored waveforms incorporating the controlled orthogonal offset are used to synthesize a sequence of symbols. The stored waveforms may also include nonlinear and/or linear predistortion to reduce computational complexity. The waveforms can be represented in Cartesian coordinates for use in a direct conversion transmitter or polar coordinates for use in a polar modulation transmitter. An RFID system can also include a receiver to receive incoming RFID signals.
    Type: Grant
    Filed: February 19, 2019
    Date of Patent: October 6, 2020
    Assignee: Clairvoyant Technology, Inc.
    Inventor: Thomas J. Frederick
  • Patent number: 10771133
    Abstract: A signal transmission method and apparatus, capable of determining suitable precoding granularity to enable a balance between a precoding gain and channel estimation performance. The method comprises: a first apparatus determining a first numerology employed for transmitting a signal; the first apparatus determining, according to the first numerology, first precoding granularity employed for transmitting the signal; and using the first precoding granularity to transmit the signal between the first apparatus and a second apparatus.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: September 8, 2020
    Assignee: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.
    Inventor: Yanan Lin
  • Patent number: 10750492
    Abstract: Certain aspects of the present disclosure relate to a method and apparatus for receiving a medium occupation and a resource block group (RBG) size from a gNB, wherein the radio block group size is based on a bandwidth part (BWP) configuration. In one example, UEs with smaller BWP have finer granularity in RBG size in terms of PRBs, while UEs with larger BWP may have a coarser granularity in RBG size in terms of PRBs. An additional guard band may be used if the gNB reserves some channels such that not all of the BW is occupied. For example, if the gNB reserves the 20 MHz channel, it may perform better by adding additional guard band on each side of the 20 MHz bandwidth to accommodate an adjacent channel leakage-power ratio (ACLR). Another aspect of the present disclosure relates to assigning a UE an interlace with equally spaced PRBs.
    Type: Grant
    Filed: December 18, 2018
    Date of Patent: August 18, 2020
    Assignee: QUALCOMM Incorporated
    Inventors: Xiaoxia Zhang, Kapil Bhattad, Jing Sun
  • Patent number: 10735229
    Abstract: In general, techniques are described for limiters used in wireless transmitters. A transmitter comprising a frontend circuit and a backend circuit may perform various aspects of the limiter techniques. The frontend circuit may obtain a data symbol of a plurality of data symbols representative of data to be transmitted wirelessly, and determine an amplitude and a phase representative of the data symbol. The frontend circuit may also transform the phase to a frequency, compare the frequency to a threshold frequency, and adjust, based on the comparison of the frequency to the threshold frequency, the frequency to obtain an adjusted frequency. The backend circuit configured may obtain, based on the amplitude and the adjusted frequency, a wireless signal, and transmit the wireless signal.
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: August 4, 2020
    Assignee: QUALCOMM Incorporated
    Inventors: Ondrej Jakubov, Steven Meade, Matthew Collins
  • Patent number: 10735065
    Abstract: A transmission apparatus that (i) generates a Quadrature Phase Shift Keying (QPSK) modulation signal s1(t) by applying a QPSK modulation scheme to a first data sequence, (ii) generates a 16-Quadrature Amplitude Modulation (QAM) modulation signal s2(t) by applying a 16-QAM modulation scheme to a second data sequence, (iii) generates a transmission signal z1(t) and a second transmission signal z2(t) by applying a phase hopping process, a precoding process, and a power adjust process to the QPSK modulation signal s1(t) and the 16-QAM modulation signal s2(t), wherein an average transmission power of the 16-QAM modulation signal s2(t) being the same as an average transmission power of the QPSK modulation signal s1(t), and (iv) transmits the transmission signal z1(t) from a first antenna at a first time and a first frequency and the second transmission signal z2(t) from a second antenna at the first time and the first frequency.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: August 4, 2020
    Assignee: SUN PATENT TRUST
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 10715185
    Abstract: A digital-to-analog conversion system is provided. The digital-to-analog conversion system includes a digital-to-analog converter configured to receive a pre-distorted digital signal from a digital circuit, and to generate an analog signal based on the pre-distorted digital signal. Further, the digital-to-analog conversion system includes a feedback loop for providing a digital feedback signal to the digital circuit. The feedback loop includes an analog-to-digital converter configured to generate the digital feedback signal based on the analog signal, and wherein a sample rate of the analog-to-digital converter is lower than a sample rate of the digital-to-analog converter.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: July 14, 2020
    Assignee: Intel Corporation
    Inventors: Daniel Gruber, Ramon Sanchez, Kameran Azadet, Martin Clara
  • Patent number: 10698095
    Abstract: Systems and methods in accordance with embodiments of the invention transmit and detect electromagnetic signals using an offset IQ modulation technique. Offset IQ modulation systems use a digital to analog converter to generate a transmitted waveform that is frequency offset from direct current by an amount equal or larger than half the signal bandwidth, so that the level of any local oscillator leakage present within the frequency band containing the transmitted signal is insignificant. When the transmitted signal is received, an IQ mixer is also used to down convert the received signal. In many embodiments, the down converted signal is over sampled and provided to a digital signal processing system to perform linear filtering to remove intermodulation and/or crossmodulation components that can be introduced by nonlinearities in components such as (but not limited to) Power Amplifiers, Low Noise Amplifiers and/or the IQ mixer used during the down conversion.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: June 30, 2020
    Assignee: California Institute of Technology
    Inventors: Eva Peral, Simone Tanelli, Chaitali R. Parashare, Douglas L. Price, Ninoslav Majurec
  • Patent number: 10700914
    Abstract: Embodiments may relate to digital predistortion (DPD). DPD logic may identify whether the wireless signal output power of a wireless signal that is to be transmitted is above a power threshold. The signal output power is over (or, in some embodiments, equal to) the power threshold, then the DPD logic may operate in accordance with a pre-stored DPD mode wherein DPD is performed on the wireless signal based on one or more pre-stored DPD coefficients. If the signal output power is under (or, in some embodiments, equal to) the power threshold, then the DPD logic may operate in accordance with a continuously-updated DPD mode. Other embodiments may be described or claimed.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: June 30, 2020
    Assignee: Analog Devices, Inc.
    Inventor: Steve Summerfield
  • Patent number: 10693695
    Abstract: A transmitter comprises a first peak-to-average-power ratio (PAPR) suppression circuit and a second peak-to-average-power ratio (PAPR) suppression circuit. The first PAPR suppression circuit may receive a first sequence of time-domain symbols to be transmitted, alter the first sequence based on each of a plurality of symbol ordering and/or inversion descriptors to generate a corresponding plurality of second sequences of time-domain symbols, measure a PAPR corresponding to each of the second sequences, select one of the plurality of symbol ordering and/or inversion descriptors based on the measurement of PAPR, and convey the selected one of the symbol ordering and/or inversion descriptors to the second PAPR suppression circuit. The second PAPR suppression circuit may receive the first sequence of time-domain symbols to be transmitted, and alter the first sequence based on the selected one of the symbol ordering and/or inversion descriptors to generate a reordered and/or inverted symbol sequence.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: June 23, 2020
    Assignee: MAXLINEAR, INC.
    Inventors: Curtis Ling, Tim Gallagher, Elad Shaked
  • Patent number: 10686477
    Abstract: A method for reducing or eliminating an interference signal includes: coupling a transmission signal transmitted from a transmission antenna of a communication device so as to obtain a reference signal; adjusting a power and a phase of the reference signal, superimposing a cancellation signal obtained by the adjusting with a received signal received by a reception antenna of the communication device, and coupling the obtained superposition signal so as to obtain an acquisition signal; and repeating the adjusting until a voltage value of the acquisition signal is smaller than or equal to a historical minimum voltage value, the received signal including a useful signal and an interference signal formed by the transmission signal at the reception antenna; and determining the obtained superposition signal as a received signal for eliminating interference of the receive antenna, the received signal for eliminating interference of the receive antenna including the useful signal.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: June 16, 2020
    Assignee: BEIJING XIAOMI MOBILE SOFTWARE CO., LTD.
    Inventor: Chaoxi Chen
  • Patent number: 10680664
    Abstract: A communication device including: a transmitter for providing a first radio frequency (RF) signal to a first antenna; a second antenna for receiving the first RF signal from the first antenna to produce a second RF signal; a receiver for receiving the second RF signal from the second antenna, wherein the receiver generates a feedback signal from the second RF signal; and a controller configured to control pre-distortion based on the feedback signal.
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: June 9, 2020
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hong-min Choi, Dae-young Kim, Joo-hyun Do, Young-ik Cho
  • Patent number: 10673475
    Abstract: The disclosure provides a transmitter of a communication system using hybrid digital/analog beamforming and configured to perform digital pre-distortion (DPD). In an exemplary embodiment in accordance with the disclosure, the transmitter may generate a plurality of scrambling sequences. The transmitter may comprise a plurality of combining modules to receive a combined feedback signal. The transmitter may use the plurality of scrambling sequences to recover the signals output by the antenna arrays from the combined feedback signal. Thus, the transmitter may perform DPD for each antenna array.
    Type: Grant
    Filed: October 14, 2019
    Date of Patent: June 2, 2020
    Assignee: Industrial Technology Research Institute
    Inventors: Wei-Cheng Zhuo, Wei-Min Lai, Jia-Ming Chen, Jen-Yuan Hsu
  • Patent number: 10666340
    Abstract: A split radio access network is provided that efficiently transmits beamforming coefficients from a distributed baseband unit device to a remote radio unit device to facilitate beamforming at the remote radio unit. The beamforming coefficients can be determined at the baseband unit device and transmitted along with the IQ data (data to be beamformed) to the remote radio unit device. Due to the large number of antenna ports however, there can still be a very large number of coefficients to transmit, and the disclosure provides for a compressed set of coefficients that reduces the overhead signaling requirements. Instead of sending coefficients for every kth antenna port, the system can select a subset of the coefficients corresponding to a set of k antenna ports which can be used by the remote radio unit to approximate the full set of beamforming coefficients.
    Type: Grant
    Filed: June 14, 2019
    Date of Patent: May 26, 2020
    Assignee: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: SaiRamesh Nammi, Aditya Chopra, Arunabha Ghosh, Milap Majmundar
  • Patent number: 10666341
    Abstract: A wireless communication device including a controller and a non-transitory machine-readable storage medium operatively coupled to the controller is provided. The controller executes program code stored in the non-transitory machine-readable storage medium to perform operations including: transmitting or receiving wireless signals by sweeping beams in a non-sequential order.
    Type: Grant
    Filed: February 12, 2018
    Date of Patent: May 26, 2020
    Assignee: MEDIATEK INC.
    Inventors: Chiou-Wei Tsai, Guo-Hao Gau, Cheng-Po Liang, Xiu-Sheng Li
  • Patent number: 10659138
    Abstract: Precoding is a technique that may be used in wireless communications when antenna spacing in a multiple-input multiple-output (MIMO) system is smaller than optimum spacing conditions. A precoding system and method are disclosed herein that distributes power among streams to trade-off increased data throughput and complexity of interference cancellation. Distributing power among streams may increase data throughput compared to singular value decomposition (SVD) precoding, but interference may be reduced compared to other methods that result in relatively high interference.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: May 19, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Hoda Shahmohammadian, Ming Jian
  • Patent number: 10651869
    Abstract: A radio frequency digital-to-analog converter (RFDAC) circuit includes an RFDAC array circuit including an array of cells arranged into a plurality of segments. Each segment of the plurality of segments is configured to process input data signals. The RFDAC array circuit is configured to process an input data based on activating a set of segments of the plurality of segments, forming a set of active segments, and when the sign of the input data is changed, deactivate a partially active segment of the set of active segments and activate a sign change segment within the RFDAC array circuit. The sign change segment includes a segment within the plurality of segments of the RFDAC array circuit that is different from the set of active segments.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: May 12, 2020
    Assignees: Intel IP Corporation, Intel Corporation
    Inventors: Davide Ponton, Michael Kalcher, Alan Paussa, Edwin Thaller, Franz Kuttner, Daniel Gruber
  • Patent number: 10623118
    Abstract: The system and method for adaptively obtaining coefficients of an inverse model for both equalization and pre-distortion for a multi-channel and reconfigurable RF system. The system preforms real-time learning and adaption and does not require training sets. In some cases, the system learns new coefficients across time and transient changes in performance.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: April 14, 2020
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Ryan C. Lagoy, Gregory M. Flewelling, Thomas J. Johnson
  • Patent number: 10601630
    Abstract: Devices and methods for estimation of quadrature signal imbalance are provided. A quadrature signal is coupled to a computing system. The computing system determines several points on a symmetry function of corrected quadrature signals, and identifies a symmetry point that may satisfy a threshold level. An imbalance corresponding to the identified symmetry point may be used as an imbalance estimate. The imbalance estimate can be used for imbalance correction. Multiple imbalance estimates can be combined to reduce random errors caused by noise. Triangulation can be used to identify a value of symmetry that satisfies a threshold level. Triangulation allows the determination of the location of a symmetry trough by calculating as few as four symmetry points, thereby permitting embodiments to track rapidly changing imbalance. The disclosed embodiments may be employed in optical velocimetry systems, detection and ranging systems such as radar, sonar, and lidar, ultrasonics, and communications systems.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: March 24, 2020
    Inventors: Robert Dickerman, Christopher Dickerman
  • Patent number: 10587327
    Abstract: A transmission apparatus includes M signal processors that respectively generate modulated signals directed to M reception apparatuses, M being an integer equal to or greater than 2, and an antenna section. Each signal processor modulates a first bit sequence made up of two bits to generate a first modulated signal and a second modulated signal, and modulates a second bit sequence made up of other two bits to generate a third modulated signal and a fourth modulated signal, in a case of transmitting multiple streams to a corresponding one of the M reception apparatuses. The antenna section includes a first antenna that transmits the first modulated signal and the third modulated signal and a second antenna that transmits the second modulated signal and the fourth modulated signal. At least either the signals transmitted from the first antenna or the signals transmitted from the second antenna are phase-changed signals.
    Type: Grant
    Filed: May 23, 2019
    Date of Patent: March 10, 2020
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 10567067
    Abstract: A wireless base station that includes: a transmitter that employs a plurality of antenna elements to form a beam in each of a plurality of transmission directions and transmit a reference signal; a receiver that receives a value representing reception quality of the reference signal for a user device that has received the reference signal; a memory; and a processor connected to the memory, the processor being configured to employ an indicator value, representing reception quality for a user device group computed from values received by the receiver that represent reception quality for each of a plurality of user devices, in order to select a combination of beams to employ in user data transmission from the plurality of beams transmitted by the transmitter.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: February 18, 2020
    Assignee: FUJITSU LIMITED
    Inventor: Shinya Kumagai
  • Patent number: 10567211
    Abstract: An optical transmitter apparatus is disclosed. The apparatus includes a processor, a memory coupled to the processor, and one or more programs configured to be executed by the processor. The programs include instructions for nonlinearity estimation that characterizes nonlinearity in an optical communication and estimates an amount of symbol distortion caused by the nonlinearity, instructions for selecting and mapping symbols to provide, for the nonlinearity estimation, only symbols that meet predetermined nonlinearity criteria, and instructions for storing, in the memory, the amount of symbol distortion to be used for a nonlinearity pre-compensation.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: February 18, 2020
    Assignee: ZTE Corporation
    Inventors: Jianjun Yu, Hung-Chang Chien
  • Patent number: 10567030
    Abstract: The disclosure relates to a radio modem for a motor vehicle, having an antenna arrangement, an AD-DA converter and a processor for exchanging communications data between the motor vehicle and at least one object in the vicinity of the motor vehicle. The processor is configured to provide at least one communications standard, which in each case specifies a digital protocol stack for controlling the exchange of communications data and a radio frequency f0 for a radio signal, and implementing every provided communications standard by operating the associated protocol stack and by providing a digital mixer, which is coupled on a baseband side to the protocol stack and on an HF side to the AD-DA converter and which provides for the radio frequency f0 on the HF side, wherein the AD-DA converter is connected directly between the processor and the antenna arrangement.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: February 18, 2020
    Assignee: Audi AG
    Inventor: Jürgen Spehl
  • Patent number: 10560371
    Abstract: The present disclosure discloses a method and an apparatus for adjusting a working status of an aggregated link. The method includes: when determining to switch a modulation mode of a first sub-link of an aggregated link from a first modulation mode to a second modulation mode, determining a transmission delay of transmitting a data slice in the second modulation mode by using the first sub-link; comparing the transmission delay of transmitting a data slice in the second modulation mode by using the first sub-link with a transmission delay of transmitting a data slice by using another sub-link of the aggregated link, to obtain a difference; and if the difference meets a preset condition, sending information for controlling a working status of the first sub-link to a transmit end device, so that the transmit end device controls the working status of the first sub-link in the second modulation mode.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: February 11, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventor: Yu Meng
  • Patent number: 10560305
    Abstract: Approaches for compensating for RF imperfections in a system that comprises two or more independent modules. The two or more independent modules may be comprised within a remote PHY node (RPN). RF calibration data is stored in one or more non-volatile mediums for two or more independent modules. Each of the two or more independent modules are electronically coupled in a sequence via a transmission medium. A first independent module digital compensates a RF signal for a set of two or more modules that are coupled together in sequence via the transmission medium. The first independent module may correspond to a remote PHY device (RPD).
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: February 11, 2020
    Assignee: Harmonic, Inc.
    Inventor: Adi Bonen