Training Period Or Initial Set Up Patents (Class 375/231)
  • Patent number: 10148465
    Abstract: Throughput between a transmitter and a receiver is increased by performing a three-stage joint channel optimization in which training sequences are used for calculating a pre-equalization estimate in the first stage, a look up table for pre-distortion in the second stage and a further updating the pre-equalization estimate and the look up table based on a third stage in which the training sequence used for the updating is pre-equalized and pre-distorted using previously calculated values prior to transmitting from the transmitter to the receiver.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: December 4, 2018
    Assignee: ZTE Corporation
    Inventors: Zhensheng Jia, Hung-Chang Chien, Jianjun Yu
  • Patent number: 10142154
    Abstract: Methods and OFDM receivers for decoding an OFDM signal include estimating a channel impulse response from a pilot-dense symbol of the OFDM signal for each of a plurality of potential FFT window positions; determining a noise floor of each of the channel impulse responses; selecting the potential window position corresponding to the channel impulse response with the lowest noise floor as an optimum FFT window position; and decoding symbols of the OFDM signal using the optimum FFT window position.
    Type: Grant
    Filed: March 14, 2018
    Date of Patent: November 27, 2018
    Assignee: Imagination Technologies Limited
    Inventors: Mohammed Alloulah, Paul Murrin, Alamo Spaargaren
  • Patent number: 10129063
    Abstract: A method and device for detecting a signal of an LTE uplink system in an interference condition. The method comprises: receiving baseband signals of M receiving antennas, and after fast Fourier transform, conducting demapping to obtain frequency-domain baseband signals; extracting a DMRS inserted in a received signal of each antenna, and then, calculating a channel gain hl,k of each receiving antenna; combining the baseband signals and the channel gains of the M receiving antennas to obtain a signal matrix Yk and a gain matrix Hk; calculating an interference noise covariance matrix Rk on each subcarrier; conducting interference pre-processing on a received signal on each combined subcarrier to obtain the received signal (1) and the channel gain (2) after the interference pre-processing, where D=Rk?1/2; and according to (3), conducting frequency-domain balancing on the received signal after the interference pre-processing.
    Type: Grant
    Filed: May 15, 2015
    Date of Patent: November 13, 2018
    Assignee: XI'AN ZHONGXING NEW SOFTWARE CO. LTD.
    Inventors: Hongfeng Qin, Gaocai Xiong, Dengsheng Lin
  • Patent number: 10069541
    Abstract: According to an example, a distributed antenna system includes a central processing apparatus and a plurality of antenna apparatuses connected to the central processing apparatus via Ethernet cables through an Ethernet switch. The plurality of antenna apparatuses are spatially distributed with respect to each other and the central processing apparatus is to communicate Ethernet packets to the plurality of antenna apparatuses. In addition, the plurality of antenna apparatuses are to wirelessly transmit signals corresponding to data contained in the Ethernet packets in a substantially coordinated and synchronized manner with respect to each other.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: September 4, 2018
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Raul Hernan Etkin, Sung-Ju Lee, Jung Gun Lee, Eugene Chai
  • Patent number: 10020912
    Abstract: The present invention relates to a method of improving the performance in bandwidth constrained communication systems while reducing the complexity of the equalizer used for information retrieval, as well as to improving the capacity of communication systems. The said properties are achieved by appropriate information encoding, prior to signal shaping before transmission, whereas the equalizer complexity is reduced by applying the intersymbol interference shortening filter prior to the information retrieving equalization. A proper combination of the recounted elements is capable of providing a qualitatively improved and previously unsuspected performance, as compared to its constituent elements.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: July 10, 2018
    Assignee: SANS R&D, LLC
    Inventors: Nikola Alic, John G. Proakis
  • Patent number: 9913224
    Abstract: An adaptive SINR control process is triggered based on various quality measures associated with the received signal in a mobile device or on a geographic region in which a base station and an interferer are located. As part of the adaptive SINR control process, the mobile device reduces the signal level of the received signal, which reduces both the signal strength of the desired signal and the interfering signal. If the control process is triggered on the mobile device side, after detecting the presence of interference, the mobile device sends a request that the base station increase its transmit power of the desired signal to improve the receiving SINR in the mobile device. Alternatively, the mobile device may receive information from the base station causing the mobile device to reduce the signal level of the received signal based on quality indicators sent by the mobile device to the base station or based on geographic location of the base station.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: March 6, 2018
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Yuang Lou, Neale C. Hightower, Sr.
  • Patent number: 9887749
    Abstract: An embodiment method for beamforming feedback includes receiving a sounding packet for a beamforming transmission, performing planar rotation in accordance with the sounding packet to generate phi and psi angle values, quantizing the phi and psi angle values to a same bit resolution, and feeding back the quantized phi and psi angle values.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: February 6, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Jung Hoon Suh, Jun Zhu, Osama Aboul-Magd
  • Patent number: 9832667
    Abstract: A method for estimating noise and interferer parameters includes receiving a signal comprising a noise and interference signal contribution. Noise and interference power samples are generated based on the signal. The noise and interference power samples are quantized into quantization levels. The occurrences of noise and interference power samples are accumulated for each quantization level during an observation period. Noise and interferer parameters are estimated based on the number of occurrences of noise and interference power samples per quantization level during the observation period.
    Type: Grant
    Filed: March 17, 2015
    Date of Patent: November 28, 2017
    Assignee: Intel IP Corporation
    Inventor: Stefan Fechtel
  • Patent number: 9722830
    Abstract: The disclosure is directed to a signal detection system. The system includes a receiver configured to receive data comprising noise and a signal having an amplitude lower than that of the noise received by the receiver. The system also includes a detection module configured to receive the data received by the receiver, define a region of interest of the data, compare a plurality of portions of the region of interest, and identify a portion of the region of interest that is more likely to contain the signal.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: August 1, 2017
    Assignee: THE CHARLES STARK DRAPER LABORATORY, INC.
    Inventor: Stanley Shanfield
  • Patent number: 9723625
    Abstract: A method is provided for managing a downlink transmission in a Multi User-Multiple Input Multiple Output (MU-MIMO) system. The MU-MIMO system includes a base station and a set of remote radio units connected to the base station. The method includes: obtaining large scale fading data related to a large scale fading over uplink transmission associated with a user equipment (UE); generating a UE-specific channel vector by using the large scale fading data; and scheduling a downlink transmission by using the UE-specific channel vector.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: August 1, 2017
    Assignee: ORANGE
    Inventor: Yifan Yu
  • Patent number: 9713097
    Abstract: An adaptive SINR control process is triggered based on various quality measures associated with the received signal in a mobile device or on a geographic region in which a base station and an interferer are located. As part of the adaptive SINR control process, the mobile device reduces the signal level of the received signal, which reduces both the signal strength of the desired signal and the interfering signal. If the control process is triggered on the mobile device side, after detecting the presence of interference, the mobile device sends a request that the base station increase its transmit power of the desired signal to improve the receiving SINR in the mobile device. Alternatively, the mobile device may receive information from the base station causing the mobile device to reduce the signal level of the received signal based on quality indicators sent by the mobile device to the base station or based on geographic location of the base station.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: July 18, 2017
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Yuang Lou, Neale C. Hightower, Sr.
  • Patent number: 9667315
    Abstract: A system for communicating data over power utility lines includes a plurality of endpoint devices. The endpoint devices can have modulation circuits configured and arranged to modulate data using multiple-orthogonal frequency sub-channels. The endpoint devices can also have a power line interface circuit configured and arranged to transmit the modulated data over a power utility line. A detection module can be configured and arranged to detect undesirable post modulation of a communication from one of the plurality of endpoint devices and to generate a signal responsive to the detected post modulation. The endpoint devices can then set a spacing between the multiple orthogonal frequency sub-channels in response to the signal responsive to the detected post modulation.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: May 30, 2017
    Assignee: Landis+Gyr Technologies, LLC
    Inventors: Damian Bonicatto, Stuart L. Haug
  • Patent number: 9531569
    Abstract: A receiver includes first and second equalization modules adapted to provide first and second compensations to a data signal, and a control module including a list that identifies the first equalization module as being less efficient than the second. The control module provides first and second compensation levels of the first and second compensations, such that the first and second compensations operate on the data signal to meet a bit error rate (BER) target, lowers the first compensation to reduce the power consumption of the receiver based on the list, and determines whether, in response to an increase in the level of the second compensation the BER target is met.
    Type: Grant
    Filed: October 8, 2014
    Date of Patent: December 27, 2016
    Assignee: Dell Products, LP
    Inventors: Stuart Allen Berke, Bhyrav M. Mutnury, Minchuan Wang
  • Patent number: 9509391
    Abstract: Certain aspects of the present disclosure relate to techniques for transmitting sounding feedback in Very High Throughput (VHT) wireless systems. The sounding feedback may be transmitted from a user station (STA), wherein the feedback may comprise a certain number of beamforming matrices and a certain number of singular values of a wireless channel associated with the STA. Further, the sounding feedback may comprise a bit for indicating whether this feedback represents a Single-User (SU) feedback or a Multi-User (MU) feedback.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: November 29, 2016
    Assignee: QUALCOMM INCORPORATED
    Inventors: Sameer Vermani, Rahul Tandra, Albert Van Zelst, Didier Johannes Richard Van Nee, Hemanth Sampath, Vincent Knowles Jones, IV
  • Patent number: 9473337
    Abstract: The present invention relates to inspection apparatus for use in wellbores in the oil and gas industries. In particular the invention relates in general to the field of transmission of data between downhole module in a wellbore and a controlling module at the surface. The invention provides a method an apparatus for receiving data from a telemetry module, the data being modulated according to a quadrature amplitude modulation coding scheme, in which a receiver has a carrier recovery circuit comprising a phase detector, a loop filter and a signal synthesizer generating an inphase and a quadrature demodulation signal. The method comprises receiving a preamble sinusoidal signal representing a symbol; determining the cross product of the received inphase and quadrature components and ideal inphase and quadrature components; indexing a look up table with said cross product to determine a phase adjustment and adjusting the phase of the demodulation signals in accordance with said determined phase adjustment.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: October 18, 2016
    Assignee: E.V. Offshore Limited
    Inventors: Jonathan Thursby, Sumanth Eadala
  • Patent number: 9455770
    Abstract: In a related transmitting circuit employing electromagnetic induction that is used in a communication system, there is a problem in that, because only one inductor is used in the transmitting circuit, it is impossible to perform communication at a data rate higher than the self-resonant frequency of the inductor. A transmitting circuit according to an embodiment of the present invention is a transmitting circuit that drives an inductor to transmit data to a semiconductor chip insulated from a semiconductor chip on which the transmitting circuit is mounted, and includes a driving circuit that receives outgoing data transmitted at a data rate higher than the self-resonant frequency of the inductor and outputs an outgoing signal that drives the inductor at the data rate of the outgoing data.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: September 27, 2016
    Assignee: Renesas Electronics Corporation
    Inventor: Kouichi Yamaguchi
  • Patent number: 9442557
    Abstract: The described embodiments include a computing device with one or more entities (processor cores, processors, etc.). In some embodiments, during operation, a thermal power management unit in the computing device uses a linear prediction to compute a predicted duration of a next idle period for an entity based on the duration of one or more previous idle periods for the entity. Based on the predicted duration of the next idle period, the thermal power management unit configures the entity to operate in a corresponding idle state.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: September 13, 2016
    Assignee: ADVANCED MICRO DEVICES, INC.
    Inventors: Manish Arora, Nuwan S. Jayasena, Yasuko Eckert, Madhu Saravana Sibi Govindan, William L. Bircher, Michael J. Schulte, Srilatha Manne
  • Patent number: 9391628
    Abstract: An input stage to an analog to digital converter (ADC) includes at least one sampling capacitor (SC) for sampling an input signal in acquire phases, a capacitive gain amplifier (CGA) for providing the input signal to the SC, and bandwidth control means. The bandwidth control means is configured to ensure that the SC has a first bandwidth during a first part of an acquire phase and has a second bandwidth during a subsequent, second, part of said acquire phase, the second bandwidth being smaller than the first. In this manner, first, the input signal is sampled at a higher, first, bandwidth allowing to take advantage of using a high-bandwidth CGA to minimize settling error on the SC, and, next, during a second part of the same acquire phase, the input signal is sampled at a lower, second, bandwidth advantageously decreasing noise resulting from the use of a high-bandwidth CGA.
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: July 12, 2016
    Assignee: Analog Devices Global
    Inventors: Colin G. Lyden, Pasquale Delizia, Sanjay Rajasekhar, Yogesh Jayarman Sharma, Arthur J. Kalb, Marvin L. Shu, Gerard Mora-Puchalt, Roberto S. Maurino
  • Patent number: 9385858
    Abstract: In order to initialize the phase of the recovered clock signal used in clock-and-data recovery (CDR) circuitry, the normal, on-line CDR processing is disabled. The sum of the absolute values of analog-to-digital converter (ADC) samples are generated for different clock phases over each unit interval (UI) of the analog signal sampled by the ADC for a specified period of time. The phase corresponding to the maximum sum is selected as the initial phase for the recovered clock signal for enabled, on-line CDR processing, which among other things, automatically updates the clock phase to ensure that the ADC samples the analog signal near the center of each UI.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: July 5, 2016
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Amaresh V. Malipatil, Viswanath Annampedu
  • Patent number: 9281987
    Abstract: A digital transmission apparatus and a method thereof and a digital reception apparatus are provided. A frame body processor converts incoming data and outputs a frame body, a system information generator generates system information, which is necessary for processing the data at a reception apparatus, by using a different processing method from the frame body processing method of the frame body processor, a frame generator multiplexes data of the frame body, a header of the frame, and the system information, thereby generating a frame, and a signal processor up-coverts a signal of the frame and transmits the signal to the reception apparatus.
    Type: Grant
    Filed: November 2, 2009
    Date of Patent: March 8, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jong-sook Hur, Dong-hoon Lee
  • Patent number: 9281877
    Abstract: In a method for generating a preamble of a data unit for transmission via a multiple input, multiple output (MIMO) communication channel, a first field of the preamble is generated. The first field provides a plurality of indicators to a plurality of receivers. Each one of the plurality of indicators indicates a set of a plurality of training sequences that corresponds to transmission of the data unit to a corresponding one of the plurality of receivers. The plurality of training sequences is included in a second field of the preamble. The preamble is formatted such that the first field of the preamble will be transmitted prior to the second field of the preamble being transmitted.
    Type: Grant
    Filed: May 5, 2014
    Date of Patent: March 8, 2016
    Assignee: MARVELL WORLD TRADE LTD.
    Inventors: Hongyuan Zhang, Raja Banerjea, Yong Liu, Mao Yu
  • Patent number: 9270513
    Abstract: In Software defined elastic optical networks, modulation format and constellation size may be flexibly modified. As a result, digital signal processing (DSP) algorithm should be compatible with different modulation schemes or readily reconfigurable at the optical coherent receiver. Therefore we propose a novel cascaded adaptive blind equalizers based on decision-directed modified least mean square (DD-MLMS) algorithm for polarization separation and carrier phase recovery. The algorithm is square quadrature amplitude modulation (QAM) independent so that it could be applied in the elastic optical systems. The 28 Gbaud polarization multiplexing quadrature phase shift keying (PM-QPSK) and PM-16QAM back-to-back transmission is demonstrated. The results show that the performance is very close to the general algorithm but with a benefit of the reduced operation complexity.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: February 23, 2016
    Assignee: ZTE (USA) Inc.
    Inventors: Jianjun Yu, Bo Huang
  • Patent number: 9252821
    Abstract: A method and apparatus are used to predistort input signal samples according to Volterra Series Approximation Model using one or more digital predistortion blocks (300) having a plurality of predistorter cells (301-303), each including an input multiplication stage (366-367) for combining absolute sample values received from an absolute sample delay line (362) into a first stage output, a lookup table (368) connected to be addressed by the first stage output for generating an LUT output, and a plurality of output multiplication stages (371-372, 373-374) for combining the LUT output with samples received from the amplitude sample delay line (362) and signal sample delay line (363) to generate an output signal sample yQ from said predistorter cell, where the output signal samples yQ from the predistorter cells are combined at an output adder circuit (375) to generate one or more Volterra terms of a combined signal (yOUT[n]).
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: February 2, 2016
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Roi M. Shor, Avraham D. Gal, Peter Z. Rashev
  • Patent number: 9231735
    Abstract: A method and apparatus provide for stable signal demodulation in a communication system. The method and apparatus includes including detecting an erroneous demodulation value based on backward-demodulation of received signals, using a difference between a received signal to be demodulated and a preceding signal of the received signals and correcting the error demodulation value. Alternatively, backward-demodulation is used to confirm received signals.
    Type: Grant
    Filed: February 4, 2014
    Date of Patent: January 5, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ui Kun Kwon, Chang Soon Park, Chi Sung Bae, Joon Seong Kang, Sang Joon Kim, Seung Keun Yoon, Chang Mok Choi
  • Patent number: 9215109
    Abstract: This disclosure provides a method for equalizing the transmission spectrum of a wireless communication transmitter. The method includes: providing a plurality of single-frequency signals; respectively inputting the plurality of single-frequency signals into the transmitter, wherein each single-frequency signal has a predetermined frequency and all the predetermined frequencies are different from each other; loopbacking the plurality of single-frequency signals to an analog to digital converter so as to generate a plurality of digital loopback signals; calculating a frequency response of the transmitter at base band circuit according to the plurality of digital loopback signals; and equalizing the transmission spectrum of the transmitter according to the frequency response of the transmitter.
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: December 15, 2015
    Assignee: REALTEK SEMICONDUCTOR CORP.
    Inventor: Ching-Chia Cheng
  • Patent number: 9166827
    Abstract: A data transmission method includes transmitting an encoded data signal in form of a data stream of data bursts between a transmitter and a receiver, making a decision as a function of at least one data transmission parameter as to whether an interference treatment of the data signal to be transmitted will be performed in the transmitter or in the receiver, performing the interference treatment in terms of at least on code in the transmitter, and performing the interference treatment of the data to be transmitted in terms of at least one further code in the receiver.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: October 20, 2015
    Assignee: IPCOM GMBH & CO. KG
    Inventors: Frank Kowalewski, Peter Mangold
  • Patent number: 9071288
    Abstract: A transmitting circuit that includes a driving circuit that drives an inductor to transmit data to a semiconductor chip insulated from a semiconductor chip on which the transmitting circuit is mounted. The driving circuit receives an outgoing data, compensates wave distortion of the outgoing data generated from the self-resonance of the inductor, generates a compensated outgoing data, and outputs the compensated outgoing data to drive the inductor, such that the outgoing data is transmitted at a data rate higher than the self-resonant frequency of the inductor.
    Type: Grant
    Filed: January 17, 2012
    Date of Patent: June 30, 2015
    Assignee: Renesas Electronics Corporation
    Inventor: Kouichi Yamaguchi
  • Patent number: 9052367
    Abstract: According to one embodiment, an apparatus includes a control unit and a coil unit. The control unit generates a first clock signal, generates a data signal to indicate an operating condition, modulates the first clock signal by the data signal to obtain a modulated signal, generates a clock transmission signal including the modulated signal, and emits the clock transmission signal. The coil unit converts the clock transmission signal into an electric signal, detects the modulated signal from the clock transmission signal, generates a second clock signal synchronous with the first clock signal from the modulated signal, detects an MR signal generated in a subject, digitizes, synchronously with the second clock signal, the MR signal, detects the data signal from the detected modulated signal by using of the second clock signal, controls the operating condition of the coil unit to be the operating condition indicated by the data signal.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: June 9, 2015
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventors: Koji Akita, Takahiro Sekiguchi, Kazuya Okamoto, Sojuro Kato
  • Patent number: 9054765
    Abstract: Systems and methods are provided for suppressing interference from a received data signal. A characteristic of a channel is estimated, the channel being configured for transmission of data between a transmitting device and a receiving device having two or more receive antennas. A spatial correlation of interference is determined for the two or more receive antennas based on the channel characteristic. The received data signal is filtered based on the spatial correlation.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: June 9, 2015
    Assignee: MARVELL WORLD TRADE LTD.
    Inventors: Raphael Cendrillon, Yakun Sun, Hongyuan Zhang, Atul Salhotra, Hui-Ling Lou
  • Publication number: 20150131708
    Abstract: One embodiment provides a network controller. The network controller includes a modulation module. The modulation module includes a high rate (HR) bit sequence generator configured to generate a first high rate bit sequence, encoder circuitry configured to encode a first low rate bit stream, the first low rate bit stream comprising backchannel information, and modulation circuitry configured to modulate the encoded first low rate bit stream onto the first high rate bit sequence. The network controller further includes transmit circuitry configured to transmit the modulated first HR bit sequence to a link partner during a link initialization period.
    Type: Application
    Filed: November 8, 2013
    Publication date: May 14, 2015
    Inventors: Frank N. Cornett, Brent R. Rothermel
  • Patent number: 9031124
    Abstract: A method of generating a hypothesis and estimating a CFO includes receiving a signal including a set of radio frames, dividing each received radio frame of the set into a set of received sub-sequences, dividing, each of reference radio frames from a reference signal stored in the receiver into a set of reference sub-sequences, correlating the set of received sub-sequences with the set of reference sub-sequences to obtain a set of correlation values, generating, a first value set and a second value set of hypothesis based on the correlation values, generating a first and a second hypothesis based on the first value and the second value set, and averaging the first and the second hypothesis to obtain an averaged hypothesis, performing a DFT on the averaged hypothesis to obtain a DFT sequence, determining a peak position of the DFT sequence, and estimating the CFO based on the peak position.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: May 12, 2015
    Inventors: Shrinivas Bhat, Niranjan Mylarappa Gowda
  • Patent number: 9031123
    Abstract: A receiver performs interference mitigation under blind or semi-blind conditions using diversity present in the signal of interest or in the interferer. A first path interference mitigation procedure extracts training information from received signals, performs interference mitigation on the training information and estimates the channel. The second path interference mitigation procedure uses data extracted from the received signal and the channel estimate to perform interference mitigation. Each interference mitigation process can take the form of a lossy compression followed by decompression.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 12, 2015
    Assignee: Acorn Technologies, Inc.
    Inventor: Fernando Lopez de Victoria
  • Patent number: 9020023
    Abstract: The present technique relates to a reception device and a reception method which can improve equalization performance. An equalization processing unit has a time domain equalization unit which equalizes a received signal in a time domain and a frequency domain equalization unit which is provided in parallel to the time domain equalization unit and which equalizes the received signal in a frequency domain, and performs control of switching between the time domain equalization unit and the frequency domain equalization unit. The present technique can be applied to, for example, equalize a signal of data transmitted by way of single carrier transmission or data transmitted by way of multicarrier transmission.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: April 28, 2015
    Assignee: Sony Corporation
    Inventors: Katsumi Takaoka, Naoki Yoshimochi, Hidetoshi Kawauchi, Ryo Hasegawa, Hirofumi Maruyama
  • Patent number: 9020021
    Abstract: An apparatus for encoding data signals includes a transmitter configured to encode and transmit a data signal over a communication channel, the transmitter including a precoder; a signal shaper configured to adjust the data signal by applying an equalization setting to the data signal, the equalization setting including an amplitude and offset and transmit the adjusted data signal to the precoder; and a processing unit. The processing unit is configured to perform: receiving channel coefficients associated with the communication channel; for each of a plurality of amplitude settings and a plurality of offset settings, calculating whether a modulo amplitude level would occur at a receiver using a modulo operation; selecting the equalization setting from the plurality of amplitude settings and the plurality of offset settings based on the calculation; and transmitting a control signal specifying the equalization setting to the signal shaper.
    Type: Grant
    Filed: July 29, 2013
    Date of Patent: April 28, 2015
    Assignee: International Business Machines Corporation
    Inventors: Marcel A. Kossel, Daihyun Lim, Pradeep Thiagarajan
  • Publication number: 20150110164
    Abstract: For example in case of an OFDM multicarrier transmission system the transmission characteristics of subcarriers of a multicarrier transmission system using a plurality of antenna elements (3, 3?) can be adjusted. Particularly the power and the phase of the subcarriers can be adapted. To this object the subcarrier frequency channel (2, 2?) characteristics of the multicarrier transmission are detected (11, 11?) at the side of the transmitter (3). The power of each subcarrier is then distributed by a weighting unit (14, 14?). The subcarriers can be further pre-equalized (1, 1?) by dividing the subcarrier signal respectively by the sum of the squared magnitude of the frequency channel characteristics of all subcarrier signals or a frequency characteristic of the selected antenna element (3, 3?).
    Type: Application
    Filed: December 30, 2014
    Publication date: April 23, 2015
    Applicant: Sony Deutschland GmbH
    Inventors: Ralf BĂ–HNKE, Seiichi IZUMI
  • Patent number: 9014249
    Abstract: A communications receiver includes an antenna, and a burst signal acquisition circuit coupled to the antenna to detect a burst signal received over a wireless communications channel. The burst signal has a burst structure that includes channel-corrupted known preamble bits, channel-corrupted known probe bits and channel-corrupted unknown data bits. A channel estimator is coupled to the burst signal acquisition circuit to generate a-priori a gain vector based on uncorrupted known probe bits, and to perform a recursive least squares (RLS) operation to determine an impulse response of the wireless communications channel based on the channel-corrupted known probe bits and the gain vector. A maximum likelihood sequence estimator (MLSE) or equalizer is coupled to the channel estimator and the burst signal acquisition circuit.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: April 21, 2015
    Assignee: Harris Corporation
    Inventors: Joseph B Shaver, John Wesley Nieto, Michael Patrick Snook
  • Patent number: 9014318
    Abstract: Embodiments of the invention comprise a continuous-time equalizer for reducing ISI in data received from a communication channel, and methods and circuitry for tuning or calibrating that equalizer. Selected coefficients for a transfer function of the equalizer circuit are fixed, while other coefficients are tuned by an adaptive algorithm. The adaptive algorithm minimizes errors associated with the tunable coefficients based on one or more training signals sent by the transmitter and received by the equalizer circuit at the receiver. The training signals allow for a variety of error terms to be calculated, from which the tunable coefficients are updated so as to iteratively minimize the error terms and simultaneously tune the equalizer to more accurately compensate for the degrading effects of the channel.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: April 21, 2015
    Assignee: Micron Technology, Inc.
    Inventor: Timothy Hollis
  • Patent number: 9009761
    Abstract: A system and method for wirelessly transmitting audiovisual information. Training information may be stored in a memory. A plurality of packets may be generated, including the training information. The plurality of packets may also include audiovisual information. The plurality of packets may include first information identifying a first training pattern of a plurality of possible training patterns. The first training pattern may specify one or more locations of the training information in the plurality of packets. The first information may be usable by a receiver to determine the first training pattern of the plurality of possible training patterns. The plurality of packets may be transmitted in a wireless manner.
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: April 14, 2015
    Assignee: Coherent Logix, Incorporated
    Inventors: Kevin A. Shelby, Peter J. Nysen, Michael B. Doerr
  • Publication number: 20150092828
    Abstract: A system and method consistent with the present disclosure includes determining a jitter tolerance of a particular lane of a communication link corresponding to each of a plurality of equalization coefficients. Further, determining a particular equalization coefficient of the plurality of equalization coefficients that provides a maximum jitter tolerance. Next, using the particular equalization coefficient for the particular lane of the communication link during operation based on determining the particular equalization coefficient which provides the maximum jitter tolerance.
    Type: Application
    Filed: September 27, 2013
    Publication date: April 2, 2015
    Inventors: Nathaniel L. Desimone, Theodore Z. Schoenborn, Earl Wight, Duane Heller, Maria F. Pineda
  • Patent number: 8995510
    Abstract: A portion of a signal under test corresponding to a portion of interest in an eye pattern is easily identified. An eye pattern display area displays an eye pattern that is derived from sample data of a signal under test in a bitmap form and shows frequency information with colors or brightness. A user selects an arbitrary point on the eye pattern display area with a cross-hair shaped mouse cursor, by manipulating a mouse. Thereafter, a waveform passing through the selected point is discriminably displayed, for example, with highlighted display on the eye pattern. Further, the corresponding portion of a waveform in the waveform display area is distinguishably displayed, such as with a highlighted display.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: March 31, 2015
    Assignee: Tektronix, Inc.
    Inventor: Toshiaki Obata
  • Patent number: 8995512
    Abstract: Receivers (500) and methods of adaptively adjusting the receivers based on a received interferer are described. The peak-to-average ratio of a received signal is used to determine the type of interferer. The ratio and interferer type, in addition to the type of on-channel signal, are used to select parameters to adjust the decay time of a peak detector (516), and the threshold and hysteresis of a comparator (518). The peak detector (516) and comparator (518) are used to generate an off-channel flag that indicates the presence of a relatively strong interferer to other modules in the receiver (500). If valid data is not present a default set of parameters is provided. The ratio is determined by dividing the maximum peak over the average or a range of ratios is determined by comparing a scaled value of the average to different scaled values of the peak.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: March 31, 2015
    Assignee: Motorola Solutions, Inc.
    Inventors: Moshe Ben Ayun, Ricardo Franco, Ovadia Grossman, Mark Rozental, Uri Vallach
  • Patent number: 8989253
    Abstract: A technique for a reconditioning equalizer filter for non-constant envelope signals is described. The input to a transmitter chain is modified by a reconditioning equalizer filter, prior to being applied to the transmitter. The reconditioning equalizer filter modifies and smoothens the amplitude of the signal. The modified and smoothened signal has its peaks reduced which results in lower Crest Factor. The input to the reconditioning equalizer filter could be a baseband, intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal, it needs to be down-converted to baseband before being applied to the reconditioning equalizer filter. The reconditioning equalizer filter could be performed in a digital or analog domain.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: March 24, 2015
    Assignee: Altera Corporation
    Inventor: Kiomars Anvari
  • Patent number: 8989245
    Abstract: A system and method are provided for calibrating the IQ-imbalance in a low-IF receiver. A Test Signal can be generated in a mirror frequency and conveyed to the receiver. The power of the signal produced in the receiver from the conveyed Test Signal can be measured. In the absence of an IQ-imbalance, the Test Signal can be completely eliminated in the receiver and the corresponding measured power of the produced signal can be minimized. Accordingly, a two dimensional algorithm is described for calibrating a receiver and correcting the IQ-imbalance by adjusting the phase and gain difference between the I and Q channels in the receiver based on the measured power of the signal produced in the receiver.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: March 24, 2015
    Assignee: SiTune Corporation
    Inventors: Saeid Mehrmanesh, Vahid Mesgarpour Toosi, Mahdi Khoshgard
  • Patent number: 8971210
    Abstract: A configurable network adapter has N analog front ends, each generating a receiver output and a transmitter input. In a first mode of operation, the analog front end receiver outputs are coupled to a MIMO equalizer, which is coupled to an outer receiver and to a first MAC input, with the first MAC having an output coupled to an outer transmitter, a MIMO modulator, and to the analog front end transmitter inputs. In a second mode of operation, one or more of the analog front ends is directed to a SISO modulator fed by a second outer transmitter coupled to a second MAC transmitter output. An associated one or more of the analog front end receivers is coupled to a SISO equalizer, and thereafter to an outer receiver and to the second lower MAC, thereby providing a first mode for a single MIMO adapter and a second mode for a MIMO plus independent PAN interface.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: March 3, 2015
    Assignee: Redpine Signals, Inc.
    Inventors: Partha Sarathy Murali, Logeshwaran Vijayan
  • Patent number: 8958471
    Abstract: Requests are identified for equalization coefficients and a plurality of coefficient selections are tracked relating to the requests. A matrix is maintained within a grid space that is to represent the coefficients, the matrix representing one or more of the coefficient selections. The matrix is adjusted within the grid space to obtain an adjusted matrix that is to accommodate selection of a particular coefficient outside the matrix. A final coefficient can be selected based on the adjusted matrix.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: February 17, 2015
    Assignee: Intel Corporation
    Inventor: Bruce A. Tennant
  • Patent number: 8938037
    Abstract: A circuit for reducing phase errors in a digital communication systems signal is provided. The circuit comprises a demodulator block, a feed-forward path, a feed-back path, and a slicer. The demodulator block generates a plurality of samples from the signal and determines for each sample a corresponding phase error. The feed-forward path is configured to reduce in the signal a high frequency component of the phase errors. The feed-back path configured to reduce in the signal a low frequency component of the phase errors. The slicer selectively forwards phase errors to the feed-forward path or the feed-back path based on a respective magnitude of the phase error when operating in a decision-directed mode.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: January 20, 2015
    Assignee: PMC-Sierra US, Inc.
    Inventors: Saeed Fard, Sean Gibb, Peter Graumann, Siavash Sheikh Zeinoddin
  • Patent number: 8934526
    Abstract: Methods and apparatus adapting equalizers for compensating for signal distortion of a received digital signal are disclosed. The method comprises deriving equalizer settings for a received signal, determining at least one signal parameter of said received signal; and storing the derived equalizer settings together with an indication of the signal parameter. The signal parameter could, for instance, comprise the data rate of the signal. If the signal parameter changes the equalizer is configured to use any stored settings which are appropriate for the new signal parameter. Thus, rather than start an entirely new equalizer adaptation routine every time the signal parameter changes the equalizer will use any stored settings which are appropriate for the changed parameter.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: January 13, 2015
    Inventors: Miguel Marquina, Chris Born, Ben Willcocks, Andrew Sharratt, Allard Van Der Horst
  • Patent number: 8929428
    Abstract: Embodiments are directed to feed-forward equalization. In some embodiments, a first circuit is configured to receive a signal transmitted over a channel as a differential pair, and a second circuit is configured to mirror the signal as at least a pre-cursor component comprising a first transistor of a first type of technology, a cursor component comprising a second transistor of a second type of technology, and a post-cursor component comprising a third transistor of the first type of technology.
    Type: Grant
    Filed: October 30, 2012
    Date of Patent: January 6, 2015
    Assignee: International Business Machines Corporation
    Inventors: Pier Andrea Francese, Thomas Toifl
  • Patent number: 8923433
    Abstract: An equalizer provided in a digital transmitter compensates for attenuation in a signal channel to a digital receiver. The equalizer generates signal levels as a logical function of bit history to emphasize transition signal levels relative to repeated signal levels. The preferred equalizer includes an FIR transition filter using a look-up table. Parallel circuits including FIR filters and digital-to-analog converters provide a high speed equalizer with lower speed circuitry. The equalizer is particularly suited to in-cabinet and local area network transmissions where feedback circuitry facilitates adaptive training of the equalizer.
    Type: Grant
    Filed: February 3, 2014
    Date of Patent: December 30, 2014
    Assignee: Massachusetts Institute of Technology
    Inventor: William J. Dally
  • Patent number: 8923416
    Abstract: Systems and methods for implementing symbol-level repetition coding in power line communications (PLC) are described. In some embodiments, these systems and methods may provide reliable communication in severe channel environments of PLC networks, at least in part, by changing the forward error correction (FEC) used by various devices operating within current PLC systems. For example, a method may include receiving a PLC signal and applying convolutional encoding to the received signal, the convolutional encoding producing an encoded signal. The method may also include performing a subcarrier modulation operation upon the encoded signal, the subcarrier modulation operation producing a modulated signal. The method may further include applying symbol-level repetition coding to the modulated signal, the symbol-level repetition coding producing a repetitious signal. In some cases, one or more distinct repetition patterns may be applied to different symbols or portions thereof.
    Type: Grant
    Filed: October 6, 2011
    Date of Patent: December 30, 2014
    Assignee: Texas Instruments Incorporation
    Inventors: Il Han Kim, Badri N. Varadarajan, Anand G. Dabak