Intersymbol Interference Patents (Class 375/348)
  • Patent number: 11895518
    Abstract: Systems and methods for transferring data via a two-way radio transmission are described herein. An example method commences with collecting asset data, determining conditions for transmission of the asset data to a data server, and determining a mode for the transmission of the asset data. The method continues with preprocessing the asset data for the transmission. The preprocessing includes determining that the conditions for transmission of the asset data satisfy predetermined criteria and setting priorities for one or more parts of the asset data. The priorities are set based at least on a type of the data and a location of the data collection device. The method further includes transmitting the asset data to a data server. The asset data is transmitted based on the mode for the transmission and the priorities via at least one of the one or more communication channels.
    Type: Grant
    Filed: February 6, 2023
    Date of Patent: February 6, 2024
    Assignee: HDWB, LLC
    Inventors: Eric William Hoffmann, John Myrl Warren
  • Patent number: 11888661
    Abstract: A method and apparatus are provided for demodulating a wireless signal modulated by phase-shift keying. The signal comprises a plurality of symbols. The method includes: obtaining a first sequence of samples based on the signal; converting the first sequence of samples to a first sequence of frequency domain samples; selecting, as a decision variable, the sample that has the maximum magnitude among the first sequence of frequency domain samples; and identifying a symbol or a symbol-transition based on the decision variable.
    Type: Grant
    Filed: December 3, 2021
    Date of Patent: January 30, 2024
    Assignee: u-blox AG
    Inventor: Zhenlan Cheng
  • Patent number: 11876650
    Abstract: An equalizer includes a first feed-forward stage that provides a measure of low-frequency ISI and a second feed-forward stage that includes a cascade of stages each making an ISI estimate. The ISI estimate from each stage is further equalized by application of the measures of low-frequency ISI from the first feed-forward stage and fed to the next in the cascade of stages. The ISI estimates from the stages thus become progressively more accurate. The number of stages applied to a given signal can be optimized to achieve a suitably low bit-error rate. Power is saved by disabling stages which are not required to meet that goal.
    Type: Grant
    Filed: November 1, 2022
    Date of Patent: January 16, 2024
    Assignee: Cadence Design Systems, Inc.
    Inventors: Prashant Choudhary, Nanyang Wang
  • Patent number: 11876622
    Abstract: Examples relate to a Forward Error Correction (FEC) encoder, an FEC decoder, Passive Optical Network (PON) systems, an Optical Line Terminal (OLT), an Optical Networking Unit (ONU), and to corresponding methods and computer programs. A forward-error-correction (FEC) encoder that is suitable for generating FEC data for use with hard-decision input at a receiver and for use with soft-decision input at the receiver is configured to generate the FEC data based on payload bits using a Low-Density Parity-Check (LDPC) code. The generated FEC data is generated using a single LDPC code that is suitable for use with soft-decision input and hard-decision input at the receiver or using one of two LDPC codes that are suitable for soft-decision input and hard-decision input, respectively.
    Type: Grant
    Filed: March 15, 2021
    Date of Patent: January 16, 2024
    Assignee: Intel Corporation
    Inventors: Rainer Strobel, Santhosh K. Vanaparthy
  • Patent number: 11856081
    Abstract: The present disclosure is directed to timestamp detection using a cable modem and to a control apparatus, control device and control method for detecting time stamps in various signals such as orthogonal frequency division multiplexing (OFDM) signals. The control apparatus comprising processing circuitry being configured to obtain information a channel frequency response of the multi-path channel, the channel frequency response being based on a signal comprising a sequence of symbols. The processing circuitry is configured to transform the channel frequency response into a channel impulse response. The processing circuitry is configured to identify a peak in the channel impulse response. The processing circuitry is configured to determine a timestamp offset time between the peak in the channel impulse response and a trigger time indicative of a beginning of a symbol in the signal. The processing circuitry is configured to synchronize the device clock based on the timestamp offset time.
    Type: Grant
    Filed: April 15, 2020
    Date of Patent: December 26, 2023
    Assignee: MaxLinear, Inc.
    Inventors: Thushara Hewavithana, Barak Hermesh
  • Patent number: 11831747
    Abstract: A receiver includes a feed-forward equalizer, a first detector, a jitter estimation circuit, and a jitter mitigation circuit. The feed-forward equalizer is configured to equalize channel gain of digitized samples of a received signal and to output equalized samples. The first detector is configured to detect symbols in the equalized samples. The jitter estimation circuit is configured to estimate jitter in the equalized samples by estimating a deviation in periodicity between pairs of the equalized samples. The jitter mitigation circuit comprises a linearized FIR filter configured to receive an input including the equalized samples or the detected symbols and to compensate inter symbol interference in the equalized samples due to the jitter as a function of the estimated jitter and an estimate of the inter symbol interference.
    Type: Grant
    Filed: January 31, 2022
    Date of Patent: November 28, 2023
    Assignee: MARVELL ASIA PTE LTD
    Inventors: Benjamin Smith, Jamal Riani
  • Patent number: 11824615
    Abstract: A beam weight obtaining method and an apparatus. An aggregation path is generated by using energy of a plurality of paths to help improve quality of a generated beam, thereby improving an SNR and a capacity of a terminal device. The method includes: a network device obtains a plurality of paths that meet a multipath aggregation condition, where the multipath aggregation condition includes one or more of the following conditions: a condition that every two paths in the plurality of paths need to meet in space, and a condition that every two paths in the plurality of paths need to meet in power. The network device determines aggregation information based on the plurality of paths, where the aggregation information includes information required by the network device to generate an aggregation path corresponding to the plurality of paths.
    Type: Grant
    Filed: September 10, 2021
    Date of Patent: November 21, 2023
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Xudong Zhu, Boya Qin, Youtuan Zhu
  • Patent number: 11817973
    Abstract: A method and a receiving node for determining a channel window length (l{circumflex over (?)}) for a transformed domain channel estimator, the channel window length (l{circumflex over (?)}) to be applied for a particular reference signal (RS) carrying symbol. At least two subsets (A1, A2, . . . ) of received RS carrying symbols are obtained out of a set of RS carrying symbols ({S1, S2, . . . }), where the particular RS carrying symbol is included in at least one of the at least two subsets (A1, A2, . . . ). A corresponding hypothesis channel window length (l*) is determined for the at least one of the subsets (A1, A2, . . . ) based on a set of channel responses. The channel window length (l{circumflex over (?)}) for the particular RS carrying symbol is then determined based on the corresponding hypothesis channel window length (l*).
    Type: Grant
    Filed: January 4, 2019
    Date of Patent: November 14, 2023
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Zhao Wang, Efthymios Stathakis
  • Patent number: 11811566
    Abstract: Embodiments herein disclose a receiver for performing adaptive equalization of data samples, wherein the receiver comprises an adaptation circuitry and an equalizer coupled to the adaptive circuitry. The adaptive circuitry is configured to estimate a pulse response of a channel, on receiving at least one data sample over the channel, wherein the pulse response of the channel identifies an intersymbol interference (ISI) present on the received at least one data sample. The equalizer is configured to perform equalization of the received at least one data sample by cancelling the identified ISI on the received at least one data sample.
    Type: Grant
    Filed: June 2, 2022
    Date of Patent: November 7, 2023
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Sushrant Monga
  • Patent number: 11764894
    Abstract: A method for inhibiting jammed signal use includes: receiving a desired signal wirelessly at a receiver; receiving an undesired signal wirelessly at the receiver, the undesired signal varying in strength over time; and inhibiting measurement of the desired signal, or use of a measurement of the desired signal, based on a determination that the undesired signal is a jamming signal based on a variation of the undesired signal being indicative of jamming.
    Type: Grant
    Filed: August 26, 2021
    Date of Patent: September 19, 2023
    Assignee: QUALCOMM Incorporated
    Inventors: Jordan Cookman, Daniel Carolin, Angelica Wong, Krishnaranjan Rao, Liang Zhao, Jeffrey Wong
  • Patent number: 11764857
    Abstract: Methods for improving multiple signal reception using receiver diversity in the context of a wideband radar and communications receiver. The method allows for improved signal reception as well as improved angle of arrival estimation. A first approach uses a method that improves angle of arrival estimation while using the standard diversity technique of selection combining. A second approach uses a method of equalization of the signal rather than equalization of the channel to both improve the signal SNR over standard selection combining and further improve the angle of arrival estimate over the first approach.
    Type: Grant
    Filed: September 3, 2021
    Date of Patent: September 19, 2023
    Assignee: The Boeing Company
    Inventor: Gary A. Ray
  • Patent number: 11750274
    Abstract: A controller is configured to control the adaptive notch filter and to execute a search technique (e.g., artificial intelligence (AI) search technique) to converge on filter coefficients and to recursively adjust the filter coefficients of the adaptive notch filter in real time to adaptively adjust one or more filter characteristics (e.g., maximum notch depth or attenuation, bandwidth of notch, or general magnitude versus frequency response of notch).
    Type: Grant
    Filed: September 30, 2021
    Date of Patent: September 5, 2023
    Assignee: Deere & Company
    Inventors: Wei Yu, Mark P. Kaplan, Richard G. Keegan, David M. Li
  • Patent number: 11736179
    Abstract: Various embodiments of the present disclosure provide a method for multi-antenna transmission. The method which may be performed by a communication device comprises determining first correlation information in response to interference to data on a first subset of multiple antenna branches of the communication device. The first correlation information may indicate at least correlation between the data on the first subset of the multiple antenna branches and data on a second subset of the multiple antenna branches which is not affected by interference. The method further comprises correcting the data on the first subset of the multiple antenna branches, based at least in part on the first correlation information.
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: August 22, 2023
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Ang Feng, Zhicai Ma, Liushuan Zhou, Yanhui Zhao
  • Patent number: 11720071
    Abstract: A computing device is provided, including memory storing a cost function of a plurality of variables. The computing device may further include a processor configured to, for a stochastic simulation algorithm, compute a control parameter upper bound. The processor may compute a control parameter lower bound. The processor may compute a plurality of intermediate control parameter values within a control parameter range between the control parameter lower bound and the control parameter upper bound. The processor may compute an estimated minimum or an estimated maximum of the cost function using the stochastic simulation algorithm with the control parameter upper bound, the control parameter lower bound, and the plurality of intermediate control parameter values. A plurality of copies of the cost function may be simulated with a respective plurality of seed values.
    Type: Grant
    Filed: July 27, 2022
    Date of Patent: August 8, 2023
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Damian Silvio Steiger, Helmut Gottfried Katzgraber, Matthias Troyer, Christopher Anand Pattison
  • Patent number: 11693753
    Abstract: In various examples, permanent faults in hardware component(s) and/or connections to the hardware component(s) of a computing platform may be predicted before they occur using in-system testing. As a result of this prediction, one or more remedial actions may be determined to enhance the safety of the computing platform (e.g., an autonomous vehicle). A degradation rate of a performance characteristic associated with the hardware component may be determined, detected, and/or computed by monitoring values of performance characteristics over time using fault testing.
    Type: Grant
    Filed: October 15, 2019
    Date of Patent: July 4, 2023
    Assignee: NVIDIA Corporation
    Inventors: Gunaseelan Ponnuvel, Ashish Karandikar
  • Patent number: 11665028
    Abstract: An integrated circuit equalizes a data signal expressed as a series of symbols. The symbols form data patterns with different frequency components. By considering these patterns, the integrated circuit can experiment with equalization settings specific to a subset of the frequency components, thereby finding an equalization control setting that optimizes equalization. Optimization can be accomplished by setting the equalizer to maximize symbol amplitude.
    Type: Grant
    Filed: September 23, 2021
    Date of Patent: May 30, 2023
    Assignee: Rambus Inc.
    Inventor: Ramin Farjad-Rad
  • Patent number: 11653374
    Abstract: A system that incorporates the subject disclosure may include, for example, a method for measuring a power level in at least a portion of a plurality of resource blocks occurring in a radio frequency spectrum, wherein the measuring occurs for a plurality of time cycles to generate a plurality of power level measurements, calculating a baseline power level according to at least a portion of the plurality of power levels, determining a threshold from the baseline power level, and monitoring at least a portion of the plurality of resource blocks for signal interference according to the threshold. Other embodiments are disclosed.
    Type: Grant
    Filed: December 16, 2020
    Date of Patent: May 16, 2023
    Assignee: ISCO International, LLC
    Inventors: Amr Abdelmonem, Mikhail Galeev, Sean S. Cordone, Zhigang Wang, Howard Wong, Jorge Seoane
  • Patent number: 11595064
    Abstract: A receiver circuit includes an analog-to-digital converter (ADC), a decision feedback equalizer (DFE), a slicer, and a timing error detector (TED). The DFE is coupled to the ADC, and includes a first tap and a second tap. The slicer is coupled to the DFE. The TED is coupled to the slicer. The TED is configured to initialize timing of a sampling clock provided to the ADC while initializing the second tap of the DFE and holding the first tap of the DFE at a constant value.
    Type: Grant
    Filed: August 13, 2021
    Date of Patent: February 28, 2023
    Assignee: Texas Instruments Incorporated
    Inventors: Raghu Ganesan, Saravanakkumar Radhakrishnan, Gaurav Aggarwal, Rallabandi V Lakshmi Annapurna
  • Patent number: 11575425
    Abstract: Facilitating sparsity adaptive feedback in the delay doppler domain in advanced networks (e.g., 4G, 5G, 6G, and beyond) is provided herein. Operations of a method can comprise determining, by a first device comprising a processor, a channel covariance matrix in a time-frequency domain based on a channel estimation associated with reference signals received from a second device. The method also can comprise decomposing, by the first device, the channel covariance matrix into a group of component matrices. Further, the method can comprise transforming, by the first device, respective matrices of the group of component matrices into respective covariance matrices in a delay doppler domain. The method also can comprise determining, by the first device, channel state information feedback in the delay doppler domain.
    Type: Grant
    Filed: October 19, 2021
    Date of Patent: February 7, 2023
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Salam Akoum, Xiaoyi Wang, Ralf Bendlin
  • Patent number: 11569846
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding service data, a mapper for mapping the encoded service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a frequency interleaver for frequency interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, a modulator for modulating the frequency interleaved data by an OFDM scheme and a transmitter for transmitting the broadcast signals having the modulated data, wherein the different interleaving-seed is generated based on a cyclic shifting value and wherein an interleaving seed is variable based on an FFT size of the modulating.
    Type: Grant
    Filed: January 13, 2021
    Date of Patent: January 31, 2023
    Assignee: LG ELECTRONICS INC.
    Inventors: Jongseob Baek, Jongwoong Shin, Jaehyung Kim, Woosuk Ko, Sungryong Hong
  • Patent number: 11516053
    Abstract: Embodiments of the present disclosure provide a method, device, and computer readable medium for channel equalization. The method comprises receiving, at a first device, a first signal from a second device via a plurality of subcarriers over a communication channel; sampling the first signal to obtain sampled symbols; and generating a second signal based on the obtained sampled symbols using a direct association between sampled symbols and payloads, the second signal indicating a payload of the first signal carried on an effective subcarrier of the plurality of subcarriers. Through the use of the direct association between sampled symbols and payloads, it is possible to achieve channel equalization in a less complicated, more reliable, and cost-effective manner, so as to extract the payload in the received signal.
    Type: Grant
    Filed: February 27, 2019
    Date of Patent: November 29, 2022
    Assignee: NOKIA SOLUTIONS AND NETWORKS OY
    Inventors: Chenhui Ye, Xiaofeng Hu, Dongxu Zhang, Kaibin Zhang
  • Patent number: 11502879
    Abstract: An equalizer includes a first feed-forward stage that provides a measure of low-frequency IS I and a second feed-forward stage that includes a cascade of stages each making an IS I estimate. The IS I estimate from each stage is further equalized by application of the measures of low-frequency IS I from the first feed-forward stage and fed to the next in the cascade of stages. The IS I estimate from the stages thus become progressively more accurate. The number of stages applied to a given signal can be optimized to achieve a suitably low bit-error rate. Power is saved by disabling stages which are not required to meet that goal.
    Type: Grant
    Filed: July 31, 2019
    Date of Patent: November 15, 2022
    Assignee: Rambus Inc.
    Inventors: Prashant Choudhary, Nanyang Wang
  • Patent number: 11483079
    Abstract: The described technology is generally directed towards multidimensional grid sampling for radio frequency power feedback. A mobile device can sample radio frequency signal power at multiple sample points, and can send sample values to a base station. The multiple sample points can be defined with reference to a grid having a first dimension and a second dimension, such as time and frequency, or delay and Doppler. A variety of techniques are provided to define the multiple sample points.
    Type: Grant
    Filed: November 8, 2021
    Date of Patent: October 25, 2022
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Ralf Bendlin, Salam Akoum, Xiaoyi Wang
  • Patent number: 11451305
    Abstract: Upon receipt of a coherent optical signal that includes a training signal generated using a code sequence constituted by multi-value phase modulation symbols, in which a deviation angle of a vector average of a one-symbol delay differential component of a signal generated on the basis of the code sequence has a prescribed angle and a modulation phase difference between adjacent symbols has a fixed, repeated pattern, a reception training signal corresponding to a training code sequence for frequency offset estimation is detected within a reception signal acquired by converting the received coherent optical signal into an electric signal, a plurality of delay differential components are calculated on the basis of the detected reception training signal and at least two delay signals of the reception training signal, each delay signal having a different number of delay symbols, and an averaged frequency offset amount is calculated using the calculated plurality of delay differential components.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: September 20, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryo Igarashi, Masamichi Fujiwara, Takuya Kanai
  • Patent number: 11438198
    Abstract: There is disclosed a method of operating a radio node in a wireless communication network. The method includes communicating utilising signaling, wherein communicating utilising signaling is based on performing pulse-shaping pertaining to the signaling, wherein pulse-shaping is based on a pulse-shaping indication. The disclosure also pertains to related devices and methods.
    Type: Grant
    Filed: December 2, 2019
    Date of Patent: September 6, 2022
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Robert Baldemair, Mehrnaz Afshang, Jung-Fu Cheng, Ning He, Dennis Hui, Stefan Parkvall
  • Patent number: 11431368
    Abstract: Described are concepts, systems, devices and methods that enhance decoding performance of channels subject to correlated noise. The concepts, systems, devices and methods can be used with any combination of codes, code-rates and decoding techniques. In embodiments, a continuous realization of effective noise is estimated from a lead channel by subtracting its decoded output from its received signal. This estimate is then used to improve the accuracy of decoding of an otherwise orthogonal channel that is experiencing correlated effective noise. In this approach, channels aid each other through the post-decoding provision of estimates of effective noise. In some embodiments, the lead channel is not pre-determined, but is chosen dynamically based on which of a plurality of decoders completes first, or using soft information including an estimate of effective noise that is least energetic or most likely to have occurred.
    Type: Grant
    Filed: March 16, 2021
    Date of Patent: August 30, 2022
    Assignees: Massachusetts Institute of Technology, National University of Ireland, Maynooth
    Inventors: Muriel Medard, Kenneth R. Duffy, Amit Solomon, Alejandro Cohen
  • Patent number: 11415665
    Abstract: An ultra-wideband radar transceiver and an operating method thereof are provided. The ultra-wideband radar transceiver includes a receiving module. The receiving module includes an I/Q signal generator, a first sensing circuit and a second sensing circuit. The I/Q signal generator receives M consecutive echo signals and generates M consecutive in-phase signals and M consecutive quadrature-phase signals accordingly, wherein M is an integer greater than 1. The first sensing circuit is coupled to the I/Q signal generator to receive the M consecutive in-phase signals and is configured to perform integration and analog-to-digital conversion on the M consecutive in-phase signals to generate a first digital data. The second sensing circuit is coupled to the I/Q signal generator to receive the M consecutive quadrature-phase signals and is configured to perform integration and analog-to-digital conversion on the M consecutive quadrature-phase signals to generate a second digital data.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: August 16, 2022
    Assignee: RichWave Technology Corp.
    Inventor: Hsiang-Feng Chi
  • Patent number: 11381267
    Abstract: In one aspect, an apparatus includes: a fast Fourier transform (FFT) engine to receive orthogonal frequency division multiplexing (OFDM) samples of one or more OFDM symbols and convert the one or more OFDM samples into a plurality of frequency domain carriers; and a tone cancellation circuit coupled to the FFT engine to receive the one or more OFDM samples and generate a plurality of frequency carriers for the one or more OFDM samples, identify a highest magnitude frequency carrier of the plurality of frequency carriers, and remove tone interference from the OFDM samples based at least in part on the highest magnitude frequency carrier.
    Type: Grant
    Filed: December 15, 2020
    Date of Patent: July 5, 2022
    Assignee: Silicon Laboratories Inc.
    Inventor: Alexander Kleinerman
  • Patent number: 11303282
    Abstract: An apparatus is described and includes a current integrating phase interpolator core having a programmable bias current; an inverter circuit coupled to an output of the current integrating phase interpolator core for receiving a signal comprising a periodic sawtooth waveform therefrom; a digital-to-analog (D/A) converter for setting an input common mode voltage of the inverter circuit; a duty cycle measurement (DCM) circuit for measuring a duty cycle distortion (DCD) of a clock signal output from the inverter circuit; and a circuit for computing a difference between a first state of the DCD of the clock signal corresponding to the input common mode voltage of the inverter circuit being set to a high voltage and a second state of the DCD of the clock signal corresponding to the input common mode voltage of the inverter circuit being set to a low voltage.
    Type: Grant
    Filed: July 21, 2021
    Date of Patent: April 12, 2022
    Assignee: Analog Devices, Inc.
    Inventor: John Kenney
  • Patent number: 11251999
    Abstract: A symbol boundary detection method includes: calculating desired signal power according to a receiving signal by a receiver device; calculating interference power according to the receiving signal by the receiver device; calculating a signal-to-interference power ratio according to the desired signal power and the interference power by the receiver device; finding a best signal-to-interference power ratio to determine a reference symbol boundary time by the receiver device; and processing the receiving signal according to the reference symbol boundary time by the receiver device for a subsequent demodulation process performed by a demodulator circuit.
    Type: Grant
    Filed: October 19, 2020
    Date of Patent: February 15, 2022
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventor: Chi-Hsiang Tseng
  • Patent number: 11165443
    Abstract: Disclosed embodiments of the present disclosure relate, generally, to systems, methods, and devices for correction of burst-errors induced during transmission of encoded blocks of information. Some embodiments relate to decoders configured to test candidate corrections on a received block of information and select a candidate correction that best fits the characteristics of burst-errors expected for a type of transmission scheme. Such tested candidate corrections may be selected based on characteristics of burst-errors typically induced for a type of transmission scheme. Some embodiments relate to decoders configured to test candidate corrections for correcting burst-errors and perform standard error correcting techniques such as Reed-Solomon forward error correction techniques. Some embodiments relate to systems, such as serial/deserializer interfaces, that incorporate such decoders.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: November 2, 2021
    Assignee: Microchip Technology Incorporated
    Inventor: Peter Graumann
  • Patent number: 11165431
    Abstract: An apparatus is described and includes a current integrating phase interpolator core having a programmable bias current; an AC-coupled inverter circuit coupled to an output of the current integrating phase interpolator core for receiving a signal comprising a periodic sawtooth waveform therefrom; a digital-to-analog (D/A) converter for setting an input common mode voltage of the AC-coupled inverter circuit; a duty cycle measurement (DCM) circuit for measuring a duty cycle distortion (DCD) of a rectangular wave clock signal output from the AC-coupled inverter circuit; and a circuit for computing a difference in the DCD of the rectangular wave clock signal when the input common mode voltage of the AC-coupled inverter circuit is set to a high voltage and when the input common mode voltage of the AC-coupled inverter circuit is set to a low voltage.
    Type: Grant
    Filed: December 9, 2020
    Date of Patent: November 2, 2021
    Assignee: Analog Devices, Inc.
    Inventor: John Kenney
  • Patent number: 11050449
    Abstract: A system and method for frame structure compliant adaptive extensionless windowing that maximizes fair proportional network capacity in the download. Gains are provided by emulating the multipath multiple access channel to the base station to calculate almost-optimum transmitter windowing durations prior to transmission and using the variance of received symbols using different window durations to allow the user equipment nodes to estimate optimal receiver windowing durations without calculations requiring further knowledge about the network.
    Type: Grant
    Filed: November 6, 2019
    Date of Patent: June 29, 2021
    Assignee: University of South Florida
    Inventors: Berker Pekoz, Selcuk Kose, Huseyin Arslan
  • Patent number: 11044126
    Abstract: A system and method of estimating metric values from digital samples of received communications signal carrying symbols modulated in a selected first modulation format and symbols modulated in a second modulation format. The selected first modulation format can be selected from among multiple supported first modulation formats. The system can receive the digital samples in sample blocks a plurality of which constitute a data frame.
    Type: Grant
    Filed: May 5, 2020
    Date of Patent: June 22, 2021
    Assignee: VIASAT, INC.
    Inventors: Sameep Dave, Fan Mo, Murat Arabaci, Yuri Zelensky
  • Patent number: 10771074
    Abstract: Comparators are implemented in many circuits, including analog-to-digital converters (ADCs). Some ADCs demand high bandwidth, low power consumption, and high speed. To address these requirements, a comparator circuit can be implemented without a separate pre-amplifier, where a sampling network drives a latch directly. Specifically, the comparator circuit integrates a pre-amplifier within the latch in a manner that ensures low power and high speed operation.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: September 8, 2020
    Assignee: ANALOG DEVICES, INC.
    Inventors: Paritosh Bhoraskar, Ahmed Mohamed Abdelatty Ali, Christopher Daniel Dillon
  • Patent number: 10727873
    Abstract: A decoder circuit includes an input configured to receive an encoded message, and a decoding loop circuit including first and second memories, an update circuit, and a sort circuit. The decoding loop circuit is configured to perform list decoding to the encoded message by successively decoding a plurality of bits of a first codeword of the encoded message in a plurality of decoding loops respectively; and provide, to an output, a decoded message. In each decoding loop, the update circuit is configured to receive, from the first memory, parent path values, and provide, to a second memory, child path values based on the parent path values. The sort circuit is configured to receive, from the second memory, the child path values; and provide, to the first memory, surviving child path values based on the child path values.
    Type: Grant
    Filed: April 2, 2019
    Date of Patent: July 28, 2020
    Assignee: Xilinx, Inc.
    Inventor: Gordon I. Old
  • Patent number: 10708095
    Abstract: A system and method of estimating metric values from digital samples of received communications signal carrying symbols modulated in a selected first modulation format and symbols modulated in a second modulation format. The selected first modulation format can be selected from among multiple supported first modulation formats. The system can receive the digital samples in sample blocks a plurality of which constitute a data frame.
    Type: Grant
    Filed: September 13, 2018
    Date of Patent: July 7, 2020
    Assignee: VIASAT, INC.
    Inventors: Sameep Dave, Fan Mo, Murat Arabaci, Yuri Zelensky
  • Patent number: 10700905
    Abstract: A method and apparatus for improving channel estimation within an OFDM communication system. Channel estimation in OFDM is usually performed with the aid of pilot symbols. The pilot symbols are typically spaced in time and frequency. The set of frequencies and times at which pilot symbols are inserted is referred to as a pilot pattern. In some cases, the pilot pattern is a diagonal-shaped lattice, either regular or irregular. The method first interpolates in the direction of larger coherence (time or frequency). Using these measurements, the density of pilot symbols in the direction of faster change will be increased thereby improving channel estimation without increasing overhead. As such, the results of the first interpolating step can then be used to assist the interpolation in the dimension of smaller coherence (time or frequency).
    Type: Grant
    Filed: October 29, 2019
    Date of Patent: June 30, 2020
    Assignee: Apple Inc.
    Inventors: Jianglei Ma, Ming Jia, Wen Tong, Peiying Zhu, Hang Zhang, Hua Xu, Dongsheng Yu
  • Patent number: 10666469
    Abstract: A digital signal processing circuit comprises a first equalizer circuit and a second equalizer circuit. An output of the second equalizer is used as feedback to generate an equalized signal. The output of the second equalizer circuit is based on a plurality of postcursor values and a plurality of precursor values, where the precursor values are generated based on an output of the first DFE circuit, and the postcursor values are generated independently of the output of the first DFE.
    Type: Grant
    Filed: April 29, 2019
    Date of Patent: May 26, 2020
    Assignee: MaxLinear, Inc.
    Inventors: Prasun Kali Bhattacharyya, Joseph Palackal Mathew
  • Patent number: 10659259
    Abstract: There is provided a method comprising: determining an information on an inter-symbol interference between signals on a same frequency resource and a same time resource from one or more first cells and one or more second cells, wherein an active set of the apparatus comprises at least the one or more second cells, the inter-symbol interference is an estimated inter-symbol interference if at least one of the one or more first cells is not in the active set, and the inter-symbol interference is a measured inter-symbol interference if the active set consists of the one or more first cells and the one or more second cells; and deciding whether or not to inform a network comprising the one or more first cells and the one or more second cells on the information on the inter-symbol interference.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: May 19, 2020
    Assignee: Nokia Solutions and Networks Oy
    Inventors: Ahmad Awada, Ingo Viering, Fasil Berhanu Tesema
  • Patent number: 10624126
    Abstract: Various embodiments disclosed herein provide for a closed loop Listen Before Talk (LBT) which is a coexistence mechanism used by wireless technologies such as Wi-Fi, to access unlicensed shared spectrum, such as the ISM UNII bands (5 GHz). The embodiments disclosed herein enable a base station to coordinate the LBT process at both the base station and a receiver in order to avoid hidden node interference where the interfering nodes are outside the sensing range of the transmitting node. The base station device can send a LBT trigger to the receiver to synchronize the clear channel assessments that are performed at each device to determine if there is any activity on the channel. The receiving device can send back a report to the base station device, and if no activity on the channel is detected, the base station device can schedule a transmission on the channel.
    Type: Grant
    Filed: February 16, 2018
    Date of Patent: April 14, 2020
    Assignee: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: Thomas Novlan, Arunabha Ghosh, Abdulrauf Hafeez
  • Patent number: 10554469
    Abstract: Methods and apparatus for frequency offset estimation are disclosed. In an exemplary embodiment, a method includes determining a demodulation reference signal (DMRS) frequency offset estimate from DMRS symbols in a received signal, and determining a cyclic prefix (CP) frequency offset estimate from cyclic prefix values in the received signal. The method also includes combining the DMRS and CP frequency offset estimates to determine a final frequency offset estimate. In an exemplary embodiment, an apparatus includes a DMRS frequency offset estimator that determines a DMRS frequency offset estimate based on DMRS symbols received in an uplink transmission, and a cyclic prefix (CP) frequency offset estimator that determines a CP frequency offset estimate based on cyclic prefix values in the uplink transmission. The apparatus also includes an offset combiner that combines the DMRS frequency offset estimate with the CP frequency offset estimate to generate a final frequency offset estimate.
    Type: Grant
    Filed: December 31, 2018
    Date of Patent: February 4, 2020
    Assignee: Cavium, LLC.
    Inventors: Hyun Soo Cheon, Hong Jik Kim, Tejas M. Bhatt
  • Patent number: 10511357
    Abstract: Improved wireless communications are enabled. For example, a transmitter can characterize a response of non-linear devices associated with an active-array-antenna. Data indicative of the non-linear response is forwarded to a receiving device, which can utilize the data in conjunction with decoding wireless transmissions of the active-array-antenna. Improved bit error rates can be achieved when utilizing transmitter-provided non-linear response data, as provided herein.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: December 17, 2019
    Assignee: AT&T Intellectual Property I, L.P.
    Inventor: SaiRamesh Nammi
  • Patent number: 10512069
    Abstract: In a base station device for transmitting data signals to a plurality of terminal devices, the base station device includes a signal multiplexing unit that multiplexes data signals for at least a first terminal device and a second terminal device, a control information generation unit that generates, for the first terminal device, control information containing information related to the data signal destined for the second terminal device, and a radio receiving unit that receives information of a reception processing capability of each terminal device.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: December 17, 2019
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Jungo Goto, Osamu Nakamura, Yasuhiro Hamaguchi
  • Patent number: 10476620
    Abstract: The disclosure pertains to wireless communications and, more particularly, to the exploitation of channel gain information, advantageously where more than two transmitter/receiver pairs transmit information over a shared medium. The disclosure applies distributed interference compression (23) at the receivers (receiver 1 (8), . . . , receiver k (9), . . . , and receiver K (10)) and repetition coding (13) at the transmitters (transmitter 1 (1), . . . , transmitter k (2), . . . , transmitter K (3)). Repetition coding repeats the same symbol stream (11) several times and the distributed interference compression (23) reduces the number of interference retransmissions (15) required to obtain the interference free signal (26). The throughput achieved by previous solutions is limited to two symbols per time slot, whereas in the present disclosure throughput is enhanced and is proportional to the square root of the number of transmitter/receiver pairs considered.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: November 12, 2019
    Assignees: INSTITUTO DE TELECOMUNICAÇÕES, UNIVERSIDADE DE AVEIRO
    Inventors: Adão Paulo Soares Silva, Atílio Manuel Da Silva Gameiro, Daniel Filipe Marques Castanheira
  • Patent number: 10425262
    Abstract: Methods and systems are provided for adaptive guard interval (GI) combining. A signal carrying a symbol that is preceded by a guard interval (GI) that includes a portion of the symbol may be received, and a portion of the GI that is free from inter-symbol interference (ISI) may be determined. Only a part of the ISI-free portion of the GI may be selected. The selected part of the ISI-free portion of the GI may be less than a whole of the ISI-free portion. The selection may be configured based on a parameter that is applied to a function used in extracting the symbol. The parameter may be a timing adjustment, relative to a start of the symbol, applied to the function when extracting the symbol. Only the part of the ISI-free portion of the GI may then be extracted and combined with a corresponding portion of the symbol.
    Type: Grant
    Filed: August 27, 2018
    Date of Patent: September 24, 2019
    Assignee: MAXLINEAR, INC.
    Inventors: Mingrui Zhu, Arun Kedambadi, Seung Chul Hong, Anand Anandakumar
  • Patent number: 10396851
    Abstract: It is made possible to compensate for a waveform distortion having semi-fixed characteristics and a waveform distortion varying at high speed with a high degree of accuracy.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: August 27, 2019
    Assignee: NEC CORPORATION
    Inventor: Junichi Abe
  • Patent number: 10201018
    Abstract: A method performed in a preamble transmitter for transmitting a preamble sequence, the method comprising the steps of generating S11 a short sequence s(n), the short sequence having the same time duration as an OFDM symbol used for carrying data traffic in a radio access network of the preamble transmitter, constructing S12 a preamble sequence by concatenating a plurality of said short sequences in time, and transmitting S13 the constructed preamble sequence as a radio signal to a preamble receiver transmission and reception of a random access preamble signal.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: February 5, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Henrik Sahlin, Håkan Andersson, Mattias Frenne, Johan Furuskog, Peter Nauclér
  • Patent number: 10068608
    Abstract: Systems and methods are disclosed for applying multi-stage multiple input single output (MISO) circuits for fast adaptation. An apparatus may comprise a first reader and a second reader configured to simultaneously read from a single track of a data storage medium, a MISO circuit. The MISO circuit may include a first stage filter having a first number of taps and configured to filter signal samples received from the first reader and the second reader and produce first filtered samples. The MISO circuit may also include a second stage filter having a second number of taps greater than the first number, and be configured to receive the first filtered samples corresponding to the first reader and the second reader from the first filter stage, filter the first filtered samples to produce second filtered samples, and combine the second filtered samples to produce a combined sample output.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: September 4, 2018
    Assignee: Seagate Technology LLC
    Inventors: Marcus Marrow, Jason Bellorado, Zheng Wu
  • Patent number: 10050811
    Abstract: Distortion caused by spurious components in a determined channel impulse response (CIR) is reduced. In an OFDM (orthogonal frequency-division multiplexing) system pilot signals are applied to different subcarriers of different symbols in accordance with a pilot transmission scheme. Channel estimates are determined by time-interpolation for some of the data slots of the received signal which do not already include a pilot signal. For each of a sequence of symbols, a respective Inverse Fast Fourier Transform is performed on the pilot signals and interpolated channel estimates in the data slots of that symbol, thereby determining a sequence of estimated CIRs for the sequence of symbols. Spurious channel components will vary across the sequence of estimated CIRs, whereas the true channel peaks will tend not to significantly vary across the sequence of estimated CIRs. Therefore the sequence of estimated CIRs can be filtered (e.g.
    Type: Grant
    Filed: October 3, 2014
    Date of Patent: August 14, 2018
    Assignee: Imagination Technologies Limited
    Inventor: Paul Murrin