Equalizers Patents (Class 375/229)
  • Patent number: 11394523
    Abstract: In some embodiments, a method receives a first signal that is sent in a first direction in a network. Communications in the network are full duplex communications in a same frequency band. The first signal is amplified in the first direction. The method trains a first echo canceller to cancel a first echo signal from the first signal where the first echo signal is received in a second direction. After training the first echo canceller, the trained first echo canceller is enabled. The method receives a second signal in the second direction that is sent in the second direction in the network. The second signal is amplified in the second direction. The method trains a second echo canceller to cancel a second echo signal received in the first direction from the second signal where the first echo canceller cancels the first echo signal that is received in the second direction.
    Type: Grant
    Filed: November 25, 2020
    Date of Patent: July 19, 2022
    Assignee: ARRIS Enterprises LLC
    Inventors: Thomas J. Cloonan, Ayham Al-Banna, Francis Joseph O'Keeffe
  • Patent number: 11362872
    Abstract: Wireless communication techniques for transmitting and receiving reference signals is described. The reference signals may include pilot signals that are transmitted using transmission resources that are separate from data transmission resources. Pilot signals are continuously transmitted from a base station to user equipment being served. Pilot signals are generated from delay-Doppler domain signals that are processed to obtain time-frequency signals that occupy a two-dimensional lattice in the time frequency domain that is non-overlapping with a lattice corresponding to data signal transmissions.
    Type: Grant
    Filed: June 18, 2020
    Date of Patent: June 14, 2022
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shlomo Selim Rakib, Anthony Ekpenyong, Clayton Ambrose, Shachar Kons
  • Patent number: 11352033
    Abstract: Method and system for communicating data between a transmitter and a receiver via a physical transmission medium interposed there between, wherein the transmitter outputs over the transmission medium towards the receiver, a predefined precursor signal followed by a target signal carrying data packet. Based on the precursor signal received at the receiver, estimated values of actual electrical parameters of the physical transmission medium are computed via a predetermined model of the physical transmission medium, wherein the computed estimated values of the electrical parameters are indicative of a distortion caused by the physical transmission medium on the predefined precursor signal outputted by the transmitter. The data packets originally outputted by the transmitter are estimated based on the computed estimated values of the actual electrical parameters and on the target signal received at the receiver.
    Type: Grant
    Filed: November 18, 2019
    Date of Patent: June 7, 2022
    Assignee: ALSTOM TRANSPORT TECHNOLOGIES
    Inventors: John Ross, Jeffrey Fries
  • Patent number: 11350452
    Abstract: A transmitting device (e.g., a base station, a user equipment (UE)) may pre-generate waveform components, for a transmission to be sent subsequent to a listen before talk (LBT) procedure, based on a waveform generation capability of the transmitting device (e.g., based on their memory storage capability, their ability to combine waveform components in the time domain following a per subband LBT procedure, etc.). Further, certain behavior or rules (e.g., which waveform components are generated, how many subbands are included in a waveform component, etc.) may be expected by both a base station and a UE depending on the waveform generation capability of the transmitting device and the resource allocation. Additionally, resource block group (RBG) configurations (e.g., RBG definitions) for improved resource allocation are also described. A bases station may indicate one or more guard band boundaries to a UE to indicate such RBG configurations that account for guard bands.
    Type: Grant
    Filed: January 16, 2020
    Date of Patent: May 31, 2022
    Assignee: QUALCOMM Incorporated
    Inventors: Jing Sun, Xiaoxia Zhang
  • Patent number: 11343125
    Abstract: There is provided a method including receiving, by a multiplexer, input signals having a first rate, applying, by an equalizer in the multiplexer, equalization on the input signals passed through respective signal paths in the multiplexer, and outputting, by the multiplexer, an output signal comprising a selected signal of equalized versions of the input signals produced by the equalization, the output signal having a second rate greater than the first rate. There is further provided a device that includes a multiplexer and a signal driver having an input connected to the output of the equalizer. The multiplexer includes a plurality of inputs to receive respective input signals, an output to provide an output signal selected from among the input signals, and an equalizer to apply equalization on the input signals that are passed through the multiplexer, the equalization to provide the selected signals as equalized signals at the output of the multiplexer.
    Type: Grant
    Filed: July 8, 2020
    Date of Patent: May 24, 2022
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventor: Euhan Chong
  • Patent number: 11323298
    Abstract: There is disclosed integrated circuitry having a bit receiving arrangement adapted for receiving, in parallel, a plurality of data bits, the bit receiving arrangement further being adapted for receiving a data bit inversion bit associated to the plurality of data bits, the data bit inversion bit being for indicating whether the bits of the plurality of data bits are inverted. The integrated circuitry also has a bit inversion arrangement adapted for inverting the bits of the plurality of data bits based on a comparison between the received data bit inversion bit and an inversion estimate bit, the inversion estimate bit being determined based on the plurality of data bits. The disclosure also pertains to related methods and devices.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: May 3, 2022
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventor: Lars Gustav Bohlin
  • Patent number: 11246188
    Abstract: A wireless communication apparatus performs communication for which a receiving timing and a transmitting timing are defined by using time slots. The wireless communication apparatus includes a control circuitry configured to control the wireless communication apparatus. The control circuitry includes a decoding circuitry configured to start a decoding process, on data received in a first time slot, immediately after a start of a second time slot subsequent to the first time slot. When a result of the decoding process is information requesting the wireless communication apparatus to perform transmission, the control circuitry is configured to perform a transmission preparation process from an end of the decoding process to a start of a third time slot subsequent to the second time slot, within a period of the second time slot for enabling the wireless communication apparatus to perform transmission.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: February 8, 2022
    Assignee: JVCKENWOOD Corporation
    Inventor: Tomohiro Yamaguchi
  • Patent number: 11212143
    Abstract: A method and apparatus for signal equalization are provided. Multiple decision components are arranged in a sequence, beginning with a history portion and ending with a decode portion. Each decision component performs a decode decision on a symbol. Decode decisions are passed forward to other decision components where they can be used to compensate for intersymbol interference. Decode decision output by the history portion are otherwise discarded, while decode decisions output by the decode portion are output as a decoded signal. In the next decode cycle, input previously provided to the decode portion is again provided to the history portion, in a sliding, overlapping block manner.
    Type: Grant
    Filed: June 29, 2020
    Date of Patent: December 28, 2021
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: James Raymond Bailey, Mohammad Hossein Shakiba
  • Patent number: 11206159
    Abstract: The present disclosure discloses a signal equalization apparatus. A channel length estimation circuit determines a transmission channel length of the input signal such that a processing circuit retrieves predetermined feed-forward equalizer coefficients. A feed-forward equalizer equalizes the input signal according to operation feed-forward equalizer coefficients. An auto gain circuit amplifies the input signal according to an offset signal. A signal adding circuit adds the amplified input signal and a feedback adjusting signal to generate an added input signal. A data slicer generates a data-slicing result and the offset signal according to reference thresholds based on the added input signal. A feedback equalizer equalizes the data-slicing result to generate the feedback adjusting signal according to operation feedback equalizer coefficients.
    Type: Grant
    Filed: November 4, 2020
    Date of Patent: December 21, 2021
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Tsung-En Wu, Cheng-Hsien Li
  • Patent number: 11204888
    Abstract: A circuit for receiving serial data. In some embodiments, the circuit has an input for receiving an analog input signal, and includes a first sampler for sampling the analog input signal relative to a first reference voltage, a second sampler for sampling the analog input signal relative to a second reference voltage, and a reference voltage control circuit. The second reference voltage may have a sign opposite to that of the first reference voltage; and the reference voltage control circuit may be configured to adjust the first reference voltage or the second reference voltage, based on a first sample of the analog input signal, the first sample having been taken at a sampling time corresponding to a one bit, in the serial data, preceded by a one bit and followed by a one bit.
    Type: Grant
    Filed: April 14, 2020
    Date of Patent: December 21, 2021
    Assignee: Samsung Display Co., Ltd.
    Inventors: Amr Khashaba, Amir Amirkhany
  • Patent number: 11193512
    Abstract: There are disclosed a method and a lifting mechanism for actively damping in mobile working machines vibrations which may occur as a result of raised attachments during travel. The method or the lifting mechanism has a prediction or a predictor for estimating the future vibration. The prediction is preferably carried out with a recursive least squares algorithm. The mobile working machine may, for example, be a tractor.
    Type: Grant
    Filed: June 3, 2019
    Date of Patent: December 7, 2021
    Assignee: Robert Bosch GmbH
    Inventors: Gernot Becker, Quang Huy Nguyen, Steffen Rose
  • Patent number: 11190898
    Abstract: Methods, systems, and non-transitory computer readable storage media are disclosed for rendering scene-aware audio based on acoustic properties of a user environment. For example, the disclosed system can use neural networks to analyze an audio recording to predict environment equalizations and reverberation decay times of the user environment without using a captured impulse response of the user environment. Additionally, the disclosed system can use the predicted reverberation decay times with an audio simulation of the user environment to optimize material parameters for the user environment. The disclosed system can then generate an audio sample that includes scene-aware acoustic properties based on the predicted environment equalizations, material parameters, and an environment geometry of the user environment.
    Type: Grant
    Filed: November 5, 2019
    Date of Patent: November 30, 2021
    Assignee: ADOBE INC.
    Inventors: Zhenyu Tang, Timothy Langlois, Nicholas Bryan, Dingzeyu Li
  • Patent number: 11190846
    Abstract: A method for receiving a broadcast signal includes receiving the broadcast signal; frequency deinterleaving data in the broadcast signal based on an address generator the address generator including a sequence generator generating a sequence, a symbol offset generator generating a symbol offset, after applying the symbol offset to the sequence, the sequence to which the symbol offset is applied is checked whether an address of the sequence is within a range for the frequency deinterleaving, the address within the range is used for the frequency deinterleaving; decoding the frequency deinterleaved data of a signal frame in the broadcast signal, the decoded signal frame including one or more components included in a content and content information describing the content, the content information including component information including role information for at least one of an audio component, a video component, a closed caption component or an application component of the one or more components; and displaying i
    Type: Grant
    Filed: July 2, 2020
    Date of Patent: November 30, 2021
    Assignee: LG ELECTRONICS INC.
    Inventors: Minsung Kwak, Seungryul Yang, Kyoungsoo Moon, Woosuk Ko, Sungryong Hong
  • Patent number: 11184199
    Abstract: Disclosed is an electronic apparatus including: a substrate; and an integrated circuit (IC) and an inductor provided in the substrate, the IC including: a plurality of subcircuits; and an equalizer configured to receive a signal from an outside of the IC, compensate the received signal for distortion or interference, and output the compensated signal to the subcircuit, and the inductor of which: a first end is connected to a power and a second end is connected to a power supplying terminal of the equalizer, and an inductance corresponds to an operation frequency of the equalizer.
    Type: Grant
    Filed: November 11, 2020
    Date of Patent: November 23, 2021
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Baekseok Ko
  • Patent number: 11159352
    Abstract: An adaptive equalizer includes a sample buffer that temporarily stores data obtained by fractional sampling at a sampling rate that is larger than one time and smaller than two times a symbol rate; and a processor coupled to the sample buffer and configured to: specify position of a training sequence in the data based on a correlation value between a first set of (f×T) samples and a second set of (f×T) samples following the first set of samples, assuming that the sampling rate is f, and a symbol length of a code pattern included in the training sequence inserted in the data is T, and calculate an initial value of a tap coefficient set to a tap of an adaptive equalization filter based on the specified training sequence, wherein the symbol length is set to be changeable so that f×T is an integer.
    Type: Grant
    Filed: October 9, 2020
    Date of Patent: October 26, 2021
    Assignee: FUJITSU LIMITED
    Inventors: Daisuke Sasaki, Hisao Nakashima, Nobukazu Koizumi
  • Patent number: 11153135
    Abstract: Methods and systems of adaptive equalization to compensate channel loss are disclosed. A method includes detecting a peak amplitude of an equalizer output signal and selecting a set of reference voltage levels from M sets based on the peak amplitude of the equalizer output signal, each of the M sets having N reference voltage levels. The method includes continuing to increase an equalization level in predetermined steps to a next higher equalization level if the applied equalization level does not correspond to the over-equalization level and evaluating the distribution of the resulting hit counts for each increase to the next higher equalization level until the applied equalization level corresponds to the over-equalization level. The method includes decreasing to the previously applied lower equalization level if the applied equalization level corresponds to the over-equalization level.
    Type: Grant
    Filed: January 11, 2021
    Date of Patent: October 19, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Shita Guo, Yanli Fan, Mustafa Ulvi Erdogan, Douglas Edward Wente
  • Patent number: 11153028
    Abstract: A grant-free transmission method, a terminal, and a network device are disclosed. In an embodiment, a grant-free transmission method includes sending, by a network device, information about P dedicated transmission resources used for grant-free transmission to a terminal, wherein P is a positive integer and P?2, detecting, by the network device, a dedicated transmission resource, and detecting, by the network device, data based on a transmission parameter set corresponding to the dedicated transmission resource when grant-free transmission is detected.
    Type: Grant
    Filed: May 1, 2019
    Date of Patent: October 19, 2021
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yinggang Du, Yan Chen, Xiuqiang Xu
  • Patent number: 11153124
    Abstract: A channel estimation method of a steel penetration system is configured to reduce computational complexity and required memory. The method includes: reconstructing, at a receiving end, a channel estimation with a compressed-sensing sparse reconstruction algorithm according to a received pilot signal to obtain estimation values of a channel state response of the steel penetration system; and equalizing a received signal of the receiving end according to the estimation values of the channel state response to obtain an equalized signal.
    Type: Grant
    Filed: July 9, 2020
    Date of Patent: October 19, 2021
    Assignee: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING
    Inventors: Tao Liu, Hongwei Zhang, Jiajia Liu
  • Patent number: 11120863
    Abstract: Signal timing drift in a synchronous dynamic random access memory (SDRAM) system may be compensated for by performing write signal timing training using a multi-purpose command (MPC) first-in-first-out (FIFO) write and MPC FIFO read at periodic intervals interspersed with mission-mode SDRAM traffic. The test result samples obtained from the write signal timing training may be analyzed independently of mission-mode SDRAM traffic. The mission-mode timing of the SDRAM data bit signals relative to the SDRAM write clock signal may be adjusted based on the analysis.
    Type: Grant
    Filed: January 24, 2020
    Date of Patent: September 14, 2021
    Assignee: QUALCOMM Incorporated
    Inventors: Farrukh Aquil, Vaishnav Srinivas, Mahalingam Nagarajan, Yong Xu
  • Patent number: 11063791
    Abstract: A receiver is equipped with an adaptive phase-offset controller and associated timing-calibration circuitry that together shift the timing for a data sampler and a digital equalizer. The sample and equalizer timing is shifted to a position with less residual inter-symbol interference (ISI) energy relative to the current symbol. The shifted position may be calculated using a measure of signal quality, such as a receiver bit-error rate or a comparison of filter-tap values, to optimize the timing of data recovery.
    Type: Grant
    Filed: December 13, 2019
    Date of Patent: July 13, 2021
    Assignee: Rambus Inc.
    Inventors: Qi Lin, Brian Leibowitz, Hae-Chang Lee, Jihong Ren, Kyung Suk Oh, Jared L. Zerbe
  • Patent number: 11062687
    Abstract: An active noise reduction (ANR) device includes a first sensor configured to generate an input signal indicative of an environment of the active noise reduction device, in which the first sensor has a measured roll-off frequency. A first compensator processes the input signal to generate a compensated input signal to compensate a difference between the measured roll-off frequency and a predetermined roll-off frequency for the first sensor. A second compensator processes the compensated input signal to generate a first signal for an acoustic transducer of the active noise reduction headphone.
    Type: Grant
    Filed: January 4, 2019
    Date of Patent: July 13, 2021
    Assignee: Bose Corporation
    Inventor: Masanori Honda
  • Patent number: 11050604
    Abstract: A method includes selecting a block size, via a processor of a communications system, and identifying a set of constellation points of a constellation diagram, based on a received set of bits and the constellation diagram. The constellation diagram is associated with a modulation scheme. A set of symbol blocks, based on the set of constellation points, is generated. Each symbol block from the set of symbol blocks has a size equal to the block size and includes a subset of constellation points from the set of constellation points. A unitary braid division multiplexing (UBDM) transformation is applied to each symbol block from the set of symbol blocks to produce a set of complex numbers. The set of complex numbers is then sent via the processor.
    Type: Grant
    Filed: June 1, 2020
    Date of Patent: June 29, 2021
    Assignee: Rampart Communications, Inc.
    Inventor: Matthew Brandon Robinson
  • Patent number: 11024213
    Abstract: A driving device, driving method and display system are disclosed. The driving device includes: a RGB module, a first protocol processing module and a second protocol processing module, a selector, a first deserializer and a second deserializer, and multiple transmitters and multiple connection terminals. The present invention can use two communication methods to achieve the driving, reduce the communication interface and circuit scale, and reduce the cost.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: June 1, 2021
    Assignee: WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.
    Inventor: Lijun Shen
  • Patent number: 11010572
    Abstract: The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). An electronic device and an operation method thereof are provided for testing performance of a radio frequency integrated circuit (RFIC) in a wireless communication system. The method includes checking a connection state of elements operable as combiners and a plurality of RF chains of the RFIC; performing control to output RF signals from the plurality of RF chains; acquiring an integrated signal by combining the RF signals via the combiners; and determining a quality indicator for the RFIC based the integrated signal.
    Type: Grant
    Filed: December 27, 2019
    Date of Patent: May 18, 2021
    Inventors: Sangho Lee, Seokhyeon Kim, Donggyu Minn, Youngchang Yoon, Juho Son, Kyuhwan An
  • Patent number: 10999026
    Abstract: A method for receiving orthogonal time, frequency and space (OFTS) basis allocation information by an user equipment in a wireless communication system using an OTFS transmission scheme includes receiving control information including information on an OTFS basis size N from a base station; and receiving data on OTFS bases of a predetermined size indexed according to a pre-defined rule in an N×N OTFS transform matrix on time and frequency domains corresponding to the OTFS basis size, wherein the OTFS bases of the OTFS basis size N is represented into an N×N OTFS transform matrix, wherein in the N×N OTFS transform matrix, a row index represents a cyclic frequency shift index, and a column index represents a cyclic time shift index, wherein the indexing according to the pre-defined rule includes indexing the OTFS bases of the predetermined size in an order such that the cyclic frequency shift and the cyclic time shift in the N×N OTFS transform matrix are maximized.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: May 4, 2021
    Assignee: LG Electronics Inc.
    Inventors: Hojae Lee, Sangrim Lee, Kwangseok Noh, Dongkyu Kim
  • Patent number: 10984803
    Abstract: A frame error concealment method is provided that includes predicting a parameter by performing a regression analysis on a group basis for a plurality of groups formed from a first plurality of bands forming an error frame and concealing an error in the error frame by using the parameter predicted on a group basis.
    Type: Grant
    Filed: November 4, 2019
    Date of Patent: April 20, 2021
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Ho-sang Sung
  • Patent number: 10958484
    Abstract: In some examples, a time-based equalizer can be configured to receive an input signal from a channel. The input signal can be distorted by previously received input signals transmitted over the channel. The time-based equalizer can be configured to compensate for distortions in the input signal caused by at least one previously received input signal to provide an ISI compensated input signal. The time-based equalizer can be configured to compensate for the distortions by edge time shifting respective edges of the input signal in time over a time interval for detecting the input signal to new edge time locations based on a feedback signal and edge movement signals. The feedback signal can be generated based on at least one previously received input signal.
    Type: Grant
    Filed: March 2, 2020
    Date of Patent: March 23, 2021
    Assignee: CADENCE DESIGN SYSTEMS, INC.
    Inventors: Hajee Mohammed Shuaeb Fazeel, Raksha, Thomas Evan Wilson
  • Patent number: 10944601
    Abstract: A reception circuit includes: a first equalizer configured to equalize a reception waveform; a second equalizer configured to equalize an input waveform from the first equalizer; a monitor configured to monitor magnitude of the input waveform; and a controller configured to generate a gain control code used for setting a gain of the first equalizer and a threshold voltage control code used for setting a threshold voltage to be compared with the input waveform in the second equalizer, in accordance with a monitoring result of the magnitude obtained by the monitor.
    Type: Grant
    Filed: April 21, 2020
    Date of Patent: March 9, 2021
    Assignee: FUJITSU LIMITED
    Inventor: Manabu Yamazaki
  • Patent number: 10915912
    Abstract: Systems and methods for optimizing base pricing of products within a physical retailer are provided. Such systems and methods include first collecting transaction logs for products in a set of physical retail spaces. These logs are validated, adjusted and elasticities between the products are computed. The adjustment may be responsive to the day, by retailer and by a host of external factors (e.g., weather). The adjustment may also include a normalization and filtering out of inaccurate log data. Elasticity is calculated by generalized linear models. A set of constraints are then received and used, along with the elasticities.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: February 9, 2021
    Assignee: EVERSIGHT, INC.
    Inventors: Michael Montero, Jamie Eldredge, Daniel Gibson, David Moran, Jamie Rapperport
  • Patent number: 10873407
    Abstract: A controller operates to adjust a transmitter to optimize transmission of a communications signal. The controller measures properties of a signal received from a transmitter, and generates a figure of merit (FOM) for the signal. The FOM is compared against a record of previous FOMs and corresponding previous transmitter tap values, the transmitter tap value indicating settings of a transmitter equalizer of the transmitter during transmission of the signal. A differential between the FOM and a plurality of the previous FOMs is determined, and, in response to the differential being positive, a subsequent tap value is selected from a subset of potential tap values. The subsequent tap value is sent to the transmitter for adjustment of the transmitter equalizer.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: December 22, 2020
    Assignee: Marvell Asia Pte, Ltd.
    Inventors: Myles Kimmitt, Scott D. McIlhenny
  • Patent number: 10841037
    Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. In one configuration, the apparatus may be a UE. The UE determines an MCS that would facilitate interference suppression of an interfering first cell transmission from a first cell when decoding a second cell transmission from a second cell at the UE. The interfering first cell transmission is a transmission unintended for the UE. The second cell transmission is a transmission intended for the UE. The UE transmits information indicating the determined MCS for the first cell. The UE receives a transmission including the second cell transmission from the second cell and the interfering first cell transmission from the first cell. The UE demodulates and/or decodes the second cell transmission from the received transmission based on the determined MCS.
    Type: Grant
    Filed: January 8, 2014
    Date of Patent: November 17, 2020
    Assignee: QUALCOMM Incorporated
    Inventors: Siddhartha Mallik, Taesang Yoo, Tao Luo, Yongbin Wei
  • Patent number: 10841134
    Abstract: The equalizer has a first differential pair having a first transistor and a second transistor and a second differential pair having a third transistor and a fourth transistor. A first terminal of the first transistor and a first terminal of the third transistor are connected to each other, and a first terminal of the second transistor and a first terminal of the fourth transistor are connected to each other, so that the first differential pair and the second differential pair have common input terminals. Also, resistors are respectively connected to second terminals of the first, second, third, and fourth transistors, a first zero point generation circuit is connected between the second terminal of the first transistor and the second terminal of the second transistor, and a second zero point generation circuit is connected between the second terminal of the third transistor and the second terminal of the fourth transistor.
    Type: Grant
    Filed: April 27, 2020
    Date of Patent: November 17, 2020
    Assignee: HITACHI, LTD.
    Inventors: Yusuke Wachi, Takayasu Norimatsu
  • Patent number: 10826678
    Abstract: A method for recovering a clock signal from an input signal is disclosed. The method comprises the following steps: An input signal that comprises a symbol sequence having symbol edges is received. Edge timings of the symbol edges are determined, thereby generating an edge signal, the edge signal comprising information on the edge timings. The edge signal is processed via a filter module comprising a time variant filter, thereby generating the clock signal, the clock signal comprising information on at least one clock timing parameter. Further, a clock recovery module and a computer program are disclosed.
    Type: Grant
    Filed: November 6, 2019
    Date of Patent: November 3, 2020
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Julian Leyh, Adrian Ispas
  • Patent number: 10778477
    Abstract: A method of detecting u symbol transmitted over a communication channel in a multiple input-multiple output communication system. The method includes receiving a plurality of symbols transmitted over a communication channel of a multiple input-multiple output communication system. A sphere radius is initialized based on attributes of the communication channel. A first matrix of possible transmitted signals is defined as well as a second matrix of received symbols. The matrix of possible transmitted signals is searched using a breadth-first search (BFS). Each level of the search tree is analyzed utilizing matrix multiplication to determine selected symbols satisfying the initialized sphere radius. A maximum likelihood solution is of the transmitted symbols is derived based on the selected symbols.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: September 15, 2020
    Assignee: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Hatem Ltaief, Zouheir Rezki, Mohamed Amine Arfaoui, Mohamed-Slim Alouini, David E. Keyes
  • Patent number: 10767974
    Abstract: A wavelength detection system may include one or more wavelength detection stages configured to receive at least a portion of an input light signal, where each stage may include a splitter to split a portion of the input light signal into two arms, a 90-degree optical hybrid, and two differential detectors configured to generate I-channel and Q-channel differential signals based on the outputs from the 90-degree optical hybrid. Further, a free spectral range is associated with an optical path length difference between the two arms of each stage. The system may further include a logic device to receive at least one set of detection signals including I and Q channel differential signals associated with different free spectral ranges and determine the wavelength of the input light signal based on an arctangent of a ratio of the Q-channel and I-channel differential signals for at least one set of detection signals.
    Type: Grant
    Filed: December 10, 2019
    Date of Patent: September 8, 2020
    Assignee: Rockwell Collins, Inc.
    Inventors: Wenlu Chen, Oliver S. King
  • Patent number: 10771295
    Abstract: A high-speed signaling system with adaptive transmit pre-emphasis. A transmit circuit has a plurality of output drivers to output a first signal onto a signal path. A receive circuit is coupled to receive the first signal via the signal path and configured to generate an indication of whether the first signal exceeds a threshold level. A first threshold control circuit is coupled to receive the indication from the receive circuit and configured to adjust the threshold level according to whether the first signal exceeds the threshold level. A drive strength control circuit is coupled to receive the indication from the receive circuit and configured to adjust a drive strength of at least one output driver of the plurality of output drivers according to whether the first signal exceeds the threshold level.
    Type: Grant
    Filed: August 22, 2019
    Date of Patent: September 8, 2020
    Assignee: Rambus Inc.
    Inventors: Vladimir M. Stojanovic, Andrew C. Ho, Anthony Bessios, Fred F. Chen, Elad Alon, Mark A. Horowitz
  • Patent number: 10755663
    Abstract: A display panel driver includes a timing controller and a data driver. The timing controller generates a data signal based on an input image data. The data driver receives the data signal, converts the data signal into a data voltage and outputs the data voltage to a display panel. The data signal includes positive data and negative data. The data driver includes a data skew compensating circuit which samples the positive data using the negative data and compensates a skew of the data signal.
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: August 25, 2020
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Kihyun Pyun, Yunmi Kim, Sung-Jun Kim, Juhyun Kim, Minyoung Park, Heebum Park
  • Patent number: 10735227
    Abstract: A receiver includes signal lanes to receive associated data bit streams, and a control module. The signal lanes each include configurable equalization modules to provide a selectable compensation value to the associated data bit stream. The control module performs back channel adaptations on each data bit stream to achieve a target bit error rate for the associated signal lane, determines a most common set of compensation values from the performance of the back channel adaptations, determines whether the compensation value is within a predetermined boundary for that selectable compensation value, and provides an alert when a first compensation value of the most common set of compensation values is not within the predetermined boundary for the first compensation value.
    Type: Grant
    Filed: April 16, 2019
    Date of Patent: August 4, 2020
    Assignee: Dell Products, L.P.
    Inventors: Robert G. Bassman, Stuart Allen Berke, Bhyrav M. Mutnury
  • Patent number: 10720994
    Abstract: A system and method for a high-speed transmitter comprising a precoder configured to receive a sequence of input symbols and to generate for each received symbol a respective recoded symbol is disclosed. The transmitter includes a recoding unit configured for recoding each current received PAM-M based on the recoded symbol immediately preceding the current recoded symbol at the recoding unit, a shift unit configured for determining a shift value for each current received symbol from the recoding unit based on the symbol received from the recoding unit and immediately preceding the current symbol at the shift unit; and Feed-Forward Equalizer unit for applying the shift values to the respective symbols received from the recoding unit to generate a corresponding sequence of output symbols to be transmitted in an output stream.
    Type: Grant
    Filed: February 11, 2019
    Date of Patent: July 21, 2020
    Assignee: International Business Machines Corporation
    Inventors: Alessandro Cevrero, Pier Andrea Francese, Marcel A. Kossel, Christian I. Menolfi, Ilter Özkaya, Thomas H. Toifl
  • Patent number: 10721055
    Abstract: The sampling data signal and the sampling synchronizing clock are generated by sampling the data signal and the synchronizing clock, and the first driving pulse signal and the second driving pulse signal are generated based on the sampling data signal and the sampling synchronizing clock, and the isolator is driven by the first driving pulse signal and the second driving pulse signal.
    Type: Grant
    Filed: May 9, 2019
    Date of Patent: July 21, 2020
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventor: Yuji Ikeda
  • Patent number: 10707972
    Abstract: Systems, methods, and devices are provided for compensating for distortion of a contactless communication channel. The electronic device may include a radio frequency system that itself includes antenna to transmit and receive data using near-field communication (NFC) and an NFC signal processing circuitry. The NFC signal processing circuitry may receive an NFC signal via a communication channel formed between the electronic device and another electronic device and may determine a baseband reference waveform associated with the electromagnetic NFC signal and may determine an error between a portion of the electromagnetic NFC signal and the baseband reference waveform. Furthermore, the NFC signal processing circuitry may determine whether the error is outside of an acceptable error threshold range and, in response to the error being outside of the acceptable error threshold range, train a filter response of the NFC signal processing circuitry to estimate the communication channel.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: July 7, 2020
    Assignee: Apple Inc.
    Inventors: Xinping Zeng, Vusthla Sunil Reddy, Peter M. Agboh
  • Patent number: 10693692
    Abstract: Wireless communication techniques for transmitting and receiving reference signals is described. The reference signals may include pilot signals that are transmitted using transmission resources that are separate from data transmission resources. Pilot signals are continuously transmitted from a base station to user equipment being served. Pilot signals are generated from delay-Doppler domain signals that are processed to obtain time-frequency signals that occupy a two-dimensional lattice in the time frequency domain that is non-overlapping with a lattice corresponding to data signal transmissions.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: June 23, 2020
    Assignee: Cohere Technologies, Inc.
    Inventors: Ronny Hadani, Shlomo Selim Rakib, Anthony Ekpenyong, Clayton Ambrose, Shachar Kons
  • Patent number: 10693701
    Abstract: A method is provided of receiving user data from multiple transmitters, the user data from each transmitter having been encoded as a Low Density Lattice codeword, and the multiple Low Density Lattice codewords having been transmitted so as to be received as a combined signal at a receiver, the method of receiving comprising the steps of: (i) receiving the signal, (ii) calculating coefficients of linear combinations of the codewords from the multiple transmitters, (iii) calculating a scaling factor to be applied to the signal based on the coefficients, (iv) applying the scaling factor to the signal to provide a linear combination of the codewords, (v) decoding the linear combination of the codewords based on channel state information to obtain an optimal independent linear combination of user data, (vi) repeating steps (ii), (iii) (iv) and (v) to obtain at least as many optimal independent linear combinations as the number of transmitters, and recovering the user data from the optimal independent linear combin
    Type: Grant
    Filed: August 15, 2016
    Date of Patent: June 23, 2020
    Assignee: Alcatel Lucent
    Inventors: Dong Fang, Stepan Kucera, Holger Claussen
  • Patent number: 10686632
    Abstract: A transceiver architecture supports high-speed communication over a signal lane that extends between a high-performance integrated circuit (IC) and one or more relatively low-performance ICs employing less sophisticated transmitters and receivers. The architecture compensates for performance asymmetry between ICs communicating over a bidirectional lane by instantiating relatively complex transmit and receive equalization circuitry on the higher-performance side of the lane. Both the transmit and receive equalization filter coefficients in the higher-performance IC may be adaptively updated based upon the signal response at the receiver of the higher-performance IC.
    Type: Grant
    Filed: November 7, 2018
    Date of Patent: June 16, 2020
    Assignee: Rambus Inc.
    Inventors: Jared L. Zerbe, Fariborz Assaderaghi, Brian S. Leibowitz, Hae-Chang Lee, Jihong Ren, Qi Lin
  • Patent number: 10666482
    Abstract: Embodiments of the present disclosure provide an apparatus of reducing a peak-to-average ratio of a multi-carrier signal to be transmitted in a wireless communication system. The apparatus comprises a multi-carrier processing circuitry, a storage and a peak cancellation circuitry. The multi-carrier processing circuitry is configured to process a plurality of signals on respective carriers and to combine the processed plurality of signals into a multi-carrier signal to be transmitted. The multi-carrier processing circuitry is further configured to process an injected impulse to obtain an impulse response of the multi-carrier processing circuitry. The storage is configured to store the impulse response as a clipping pulse. The peak cancellation circuitry is configured to apply the clipping pulse to the multi-carrier signal to cancel a peak of the multi-carrier signal whose amplitude is over a predetermined threshold.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: May 26, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Gan Wen, Peng Liu
  • Patent number: 10608337
    Abstract: A device and method are provided for forming a beam of a transmit antenna array in the direction of a positioning receiver. Since the beam of the transmit antenna array is formed remotely by the positioning receiver, the received gain of the incoming positioning signal is maximised while signals from other directions are attenuated, thereby mitigating any unwanted effects of multipath. Depending on the number of elements in the transmit antenna array and their physical distribution, the width of the beam can be made finer such that the positioning receiver only requires a simple omni-directional antenna to achieve an accurate positioning solution.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: March 31, 2020
    Assignee: Locata Corporation Pty Ltd
    Inventor: David Small
  • Patent number: 10608847
    Abstract: Generating first and second discharge control signals in response to a clock signal and an input voltage signal, the first and second discharge control signals decreasing at different rates to a threshold level during a first time period, wherein a difference in rates is determined by the input voltage signal, generating a differential voltage on a pair of nodes during the first time period by selectively controlling a respective amount of discharge of an initial charge on each node of the pair of nodes by applying the first and second discharge control signals to respective transistors in a differential transistor pair connected to the pair of nodes, and maintaining the differential voltage on the pair of nodes during a subsequent time period, and generating an amplified differential voltage during at least a portion of the subsequent time period by amplifying the differential voltage.
    Type: Grant
    Filed: February 5, 2019
    Date of Patent: March 31, 2020
    Assignee: KANDOU LABS, S.A.
    Inventor: Armin Tajalli
  • Patent number: 10594269
    Abstract: Techniques are described for crest factor reduction in power amplifier circuits. For example, crest factor reduction can keep the peak signal level of a signal for transmission to below a peak threshold level associated with a power amplifier in the transmission path. The signal is received by the crest factor reduction system and clipped in accordance with the peak threshold level. Edge smoothing is then applied to the clipped signal to reduce out-of-band emissions. The edge smoothing is implemented by a moving average filter, such as a time-domain box filter. In some embodiments, a maximum operation or minimum operation is used to prevent signal peak regrowth after the filtering. Some embodiments also include various iteration loops to further improve crest factor reduction.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: March 17, 2020
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Amir Dezfooliyan, Waleed Younis, Tobias Seifert, Gunnar Nitsche
  • Patent number: 10530615
    Abstract: The representative embodiments discussed in the present disclosure relate to techniques in which isolation between transmission signals and received signals in a transceiver may be maintained across a range of transceiver operating conditions, such as across range of output powers of a power amplifier of the transceiver. More specifically, an electrical balance duplexer may be implemented to include an adaptive power equalizer and a power equalizer control such that the attenuation of the electrical balance duplexer may be adjusted based on the transceiver operating conditions. For instance, a method may be employed to determine the output power of the power amplifier and to adjust the attenuation of the adaptive power equalizer based in part on the output power to maintain isolation between the transmission signals and the received signals.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: January 7, 2020
    Assignee: APPLE INC.
    Inventors: Joonhoi Hur, Rastislav Vazny, Ronald William Dimpflmaier
  • Patent number: 10523473
    Abstract: Various embodiments, disclosed herein, can include apparatus and methods to characterize taps of a decision feedback equalizer of a data receiver. In characterizing the taps of the decision feedback equalizer of the data receiver, a signal can be transmitted to the data receiver and the received data can be iteratively sampled at an output of the decision feedback equalizer. The sampling can include stepping a sample time relative to arrival of the received data and stepping a reference voltage level to which the received data is compared. Values of the sampled data can be compared with known correct values and such measurements can be used to characterize the taps. Additional apparatus, systems, and methods are disclosed.
    Type: Grant
    Filed: November 27, 2018
    Date of Patent: December 31, 2019
    Assignee: Micron Technology, Inc.
    Inventor: Timothy Mowry Hollis