Noise Or Distortion Reduction Patents (Class 375/254)
  • Patent number: 10433198
    Abstract: A channel sounding testing device is provided. The channel sounding testing device comprises a processor configured to use channel models and scenario specific propagation parameters, which are verified by comparable channel measurements in representative environments, to perform testing operations.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: October 1, 2019
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Johannes Kobele, Andreas Kulessa
  • Patent number: 10432240
    Abstract: Examples described herein include methods, devices, and systems which may compensate input data for non-linear power amplifier noise to generate compensated input data. In compensating the noise, during an uplink transmission time interval (TTI), a switch path is activated to provide amplified input data to a receiver stage including a coefficient calculator. The coefficient calculator may calculate an error representative of the noise based partly on the input signal to be transmitted and a feedback signal to generate coefficient data associated with the power amplifier noise. The feedback signal is provided, after processing through the receiver, to a coefficient calculator. During an uplink TTI, the amplified input data may also be transmitted as the RF wireless transmission via an RF antenna. During a downlink TTI, the switch path may be deactivated and the receiver stage may receive an additional RF wireless transmission to be processed in the receiver stage.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: October 1, 2019
    Assignee: Micron Technology, Inc.
    Inventors: Fa-Long Luo, Jeremy Chritz, Jaime Cummins, Tamara Schmitz
  • Patent number: 10387533
    Abstract: An apparatus and a method is provided. The apparatus includes a polynomial generator, including an input and an output; a first matrix generator, including an input connected to the output of the polynomial generator, and an output; a second matrix generator, including an input connected to the output of the first matrix generator, and an output; a third matrix generator, including a first input connected to the output of the first matrix generator, a second input connected to the output of the second matrix generator, and an output; and a convolution generator, including an input connected to the output of the third matrix generator, and an output.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: August 20, 2019
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Weiran Deng, Zhengping Ji
  • Patent number: 10333567
    Abstract: Examples described herein include methods, devices, and systems which may compensate input data for non-linear power amplifier noise to generate compensated input data. In compensating the noise, during an uplink transmission time interval (TTI), a switch path is activated to provide amplified input data to a receiver stage including a coefficient calculator. The coefficient calculator may calculate an error representative of the noise based partly on the input signal to be transmitted and a feedback signal to generate coefficient data associated with the power amplifier noise. The feedback signal is provided, after processing through the receiver, to a coefficient calculator. During an uplink TTI, the amplified input data may also be transmitted as the RF wireless transmission via an RF antenna. During a downlink TTI, the switch path may be deactivated and the receiver stage may receive an additional RF wireless transmission to be processed in the receiver stage.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: June 25, 2019
    Assignee: Micron Technology, Inc.
    Inventors: Fa-Long Luo, Jeremy Chritz, Jaime Cummins, Tamara Schmitz
  • Patent number: 10251029
    Abstract: The present invention provides an apparatus of transmitting broadcast signals. The apparatus includes, an encoder encoding service data, a constellation mapper mapping the encoded service data by either QAM, NUQ (Non Uniform QAM) or NUC (Non Uniform Constellation), a mapper mapping the mapped service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a modulator modulating data in the built at least one signal frame by an OFDM scheme and a transmitter transmitting the broadcast signals having the modulated data.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: April 2, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Byeongkook Jeong, Woosuk Ko, Youngjin Hong, Sungryong Hong
  • Patent number: 10194020
    Abstract: The invention relates to a method of managing a digital subscriber line, in particular for identifying the location of weather related faults. The invention continuously measures the signal to noise (SNR) margin on the DSL line as well as measurements from weather related sensors, such as moisture and wind sensors, which each have an associated geographical location. The SNR margin measures are compared to predetermined conditions based on SNR margin characteristics associated with a population of good lines. If the SNR margin measures fail to meet the predetermined conditions, the SNR measures are also compared to the weather sensor measurements over a day or number of days. If there is a correlation between the SNR margin measures and at least one of the sensors, then location of the fault is identified as the location of the sensor having the strongest correlation with the SNR measures.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: January 29, 2019
    Assignee: BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
    Inventors: Richard Gedge, Ian Neild
  • Patent number: 10158388
    Abstract: A receiver device for a communication system is arranged for receiving a signal comprising a plurality of transponder signals each containing a plurality of carrier signals and comprises: an adjustable spectral filter configurable for selecting a desired transponder signal. Means for performing a non-linear transformation on the selected desired transponder signal, whereby the non-linear transformation is represented by a set of parameter values. At least one receive filter configurable to select at least one desired carrier signal of the non-linearly transformed selected desired transponder signal and, performance measuring means for determining one or more performance metrics on at least one carrier signal of the plurality of carrier signals contained in the desired transponder signal to obtain the set of parameter values.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: December 18, 2018
    Assignee: NEWTEC CY
    Inventors: Frederik Simoens, Daniel Delaruelle
  • Patent number: 10044408
    Abstract: The present invention discloses a method and an apparatus to automatically remove crosstalk, which can automatically mask G.fast frequencies that will produce crosstalk between an existing transmission line and each port of a DPU/DSLAM equipment without unnecessary manual operation, to automatically remove crosstalk interference between G.fast and the existing transmission line, and is applicable for various generic interfaces. According to the present invention, the installation time is greatly reduced, human errors are also reduced, and the installation can be done correctly by ordinary technicians, which is advantageous to the promotion of G.fast systems.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: August 7, 2018
    Assignee: Arcadyan Technology Corp.
    Inventors: Yu-Shuang Yang, Shih-Chao Chu, Sheng-Jhe Hong, Po-Chieh Tseng
  • Patent number: 9998590
    Abstract: This invention relates to a method of managing a digital subscriber line, where an optimum point at which to trigger a line test on the DSL line is determined. The invention continuously measures the signal to noise (SNR) margin on the DSL line, and compares the measurements to predetermined conditions based on SNR margin characteristics associated with a population of good lines. Once the SNR margin measurements fail to meet the predetermined conditions, an electrical line test is triggered. Thus, monitoring is done in the DSL domain, but the line test triggered is in the electrical domain. In an improved method, moisture level sensors provide a measure of the atmospheric moisture levels experienced by the line. If the SNR margin measurements fail to meet the predetermined conditions, and in addition there is a correlation with atmospheric moisture levels, then a line test is triggered on the line.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: June 12, 2018
    Assignee: BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
    Inventors: Richard Gedge, Simon Barnett
  • Patent number: 9979580
    Abstract: Coding techniques for a (e.g., OFDM) communication system capable of transmitting data on a number of “transmission channels” at different information bit rates based on the channels' achieved SNR. A base code is used in combination with common or variable puncturing to achieve different coding rates required by the transmission channels. The data (i.e., information bits) for a data transmission is encoded with the base code, and the coded bits for each channel (or group of channels with the similar transmission capabilities) are punctured to achieve the required coding rate. The coded bits may be interleaved (e.g., to combat fading and remove correlation between coded bits in each modulation symbol) prior to puncturing. The unpunctured coded bits are grouped into non-binary symbols and mapped to modulation symbols (e.g., using Gray mapping). The modulation symbol may be “pre-conditioned” and prior to transmission.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: May 22, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Fuyun Ling, J. Rodney Walton, Mark Wallace, Ivan Jesus Fernandez Corbaton, Naga Bhushan
  • Patent number: 9923101
    Abstract: A semiconductor structure is provided. The semiconductor structure includes a floating substrate; and a capacitor grounded and connected to the floating substrate. A method of manufacturing a semiconductor structure is also provided.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: March 20, 2018
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING CO., LTD.
    Inventors: Hsiao-Tsung Yen, Yu-Ling Lin, Chin-Wei Kuo, Ho-Hsiang Chen, Chewn-Pu Jou, Min-Chie Jeng
  • Patent number: 9877280
    Abstract: Provided are power saving methods and devices for a multimode terminal. The method includes that: state values CLK1_EN/CLK2_EN of PWRCTRL1/PWRCTRL2 are controlled and output by using a sleep mode and a wake up mode of a Digital Baseband (DBB) of the multimode terminal; outputs CLK1_OUT/CLK2_OUT of a radio frequency transceiver (RF TRX) are controlled by using CLK1/CLK2 and the CLK1_EN/CLK2_EN; and the CLK1_OUT/CLK2_OUT are sent to a System On chip (SOC)/BUS/Peripheral and a MODEM of the DBB, wherein the CLK1_OUT/CLK2_OUT serve as a high-speed clock source of the multimode terminal in a standby state and a working state. By the solution, the multimode terminal is enabled to shorten wake up time of the MODEM subsystem and prolong sleep time within a Discontinuous Reception (DRX) period, and the effect of reducing standby power consumption is further achieved.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: January 23, 2018
    Assignee: XI'AN ZHONGXING NEW SOFTWARE CO. LTD.
    Inventor: Liangqing Zhang
  • Patent number: 9826520
    Abstract: Provided are a communication apparatus and a method for receiving a response signal transmitted from a terminal configured with one or more downlink component carriers. The communication apparatus includes a transmitting section and a receiving section. The transmitting section is configured to transmit, to the terminal, downlink assignment information indicating one or more resources for downlink data, each of the one or more resources being assigned to one of the one or more downlink component carrier(s), and configured to transmit the downlink data to the terminal. The receiving section is configured to receive one or more response signals for the downlink data, which are transmitted from the terminal. The terminal makes the phase points of the response signals different in accordance with a number of downlink data which has been successively received.
    Type: Grant
    Filed: November 10, 2016
    Date of Patent: November 21, 2017
    Assignee: Sun Patent Trust
    Inventors: Seigo Nakao, Akihiko Nishio, Masayuki Hoshino, Ayako Horiuchi
  • Patent number: 9794090
    Abstract: Present application provides embodiments of a transmitter and an interference cancellation method. The transmitter includes: a first digital predistorter (DPD), a power amplifier (PA), and a first processor located on a feedback channel of the transmitter and separately connected to the PA and the first DPD. The first processor performs, according to a feedback cancellation signal, interference cancellation on a signal of the feedback channel, to acquire a first mixed signal, and sends the first mixed signal to the first DPD. The first DPD is configured to perform linear predistortion processing according to a first baseband signal on a first transmit channel and the first mixed signal, to generate a first predistortion signal. The PA is configured to amplify and then transmit a to-be-transmitted signal using an antenna. The to-be-transmitted signal is the first predistortion signal or a signal obtained according to the first predistortion signal.
    Type: Grant
    Filed: January 4, 2017
    Date of Patent: October 17, 2017
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Huan Xie, Xiaomin Zhou
  • Patent number: 9698713
    Abstract: Disclosed are embodiments of an apparatus for correcting an offset of a current sensor. The apparatus includes an inverter, a detector, and a RMS calculator, and a controller. The RMS calculator converts the high frequency component extracted from the filter into an effective (RMS) value. The controller, if the effective (RMS) value of the d-axis or q-axis current transformed by the RMS calculator is larger than a preset reference, increases/decreases a currently-set DC offset of each of the current sensors by a certain amount, and replaces the currently-set DC offsets with a DC offset corresponding to a smallest one of the effective (RMS) values of the d-axis or q-axis transformed by the RMS calculator, thereby correcting each of the current sensors. Accordingly, a pulsation in an output torque in controlling an electric motor can be effectively prevented.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: July 4, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Sun-Woo Lee
  • Patent number: 9693203
    Abstract: The present invention provides an apparatus of transmitting broadcast signals. The apparatus includes, an encoder encoding service data, a constellation mapper mapping the encoded service data by either QAM, NUQ (Non Uniform QAM) or NUC (Non Uniform Constellation), a mapper mapping the mapped service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a modulator modulating data in the built at least one signal frame by an OFDM scheme and a transmitter transmitting the broadcast signals having the modulated data.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: June 27, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Byeongkook Jeong, Woosuk Ko, Youngjin Hong, Sungryong Hong
  • Patent number: 9647733
    Abstract: Coding techniques for a (e.g., OFDM) communication system capable of transmitting data on a number of “transmission channels” at different information bit rates based on the channels' achieved SNR. A base code is used in combination with common or variable puncturing to achieve different coding rates required by the transmission channels. The data (i.e., information bits) for a data transmission is encoded with the base code, and the coded bits for each channel (or group of channels with the similar transmission capabilities) are punctured to achieve the required coding rate. The coded bits may be interleaved (e.g., to combat fading and remove correlation between coded bits in each modulation symbol) prior to puncturing. The unpunctured coded bits are grouped into non-binary symbols and mapped to modulation symbols (e.g., using Gray mapping). The modulation symbol may be “pre-conditioned” and prior to transmission.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: May 9, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Fuyun Ling, J. Rodney Walton, Mark Wallace, Ivan Fernandez, Naga Bhushan
  • Patent number: 9595995
    Abstract: A signal processing method is provided. The signal processing method includes receiving, at a signal processing system, a signal of interest, calculating, using the signal processing system, a power spectral density for the signal of interest, calculating, using the signal processing system, a basis vector based on the power spectral density shape, performing, using the signal processing system, a linear regression using the basis vector to generate an estimate for at least one parameter of the signal of interest, and transmitting, based on the at least one generated estimate, a signal that avoids interference with the signal of interest.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: March 14, 2017
    Assignee: The Boeing Company
    Inventors: Gary Alan Ray, James Bryan Baker
  • Patent number: 9584182
    Abstract: A vector DSL system includes a plurality of modems, which may be multi-port devices. Unprocessed user data is extracted from the modems and passed through a private vectoring data routing apparatus to one or more vectoring modules, such as vectoring cards. Each vectoring module includes one or more vector processors that include processing units configured to process the unprocessed user data on the basis of all modems' data for a given DSL tone grouping. Processing of the unprocessed user data removes the effects of FEXT from upstream and downstream user data and returns the processed user data to the modems using the vectoring data routing apparatus, which can be a specialized data transmission network utilizing one or more vector routers.
    Type: Grant
    Filed: October 7, 2014
    Date of Patent: February 28, 2017
    Assignee: Ikanos Communications, Inc.
    Inventors: Kevin D. Fisher, Nicholas P. Sands
  • Patent number: 9537519
    Abstract: Wireless communications circuitry in an electronic device may include power amplifier circuitry that is powered using a bias voltage supplied by adjustable power supply circuitry. The power supply circuitry may include envelope tracking circuitry that continuously adjusts the bias voltage. The wireless communications circuitry may generate test signals and may generate performance metric data from the test signals. Processing circuitry may generate bias voltage calibration data based on the performance metric data and may provide the calibration data to the envelope tracking circuitry. After the calibration data has been generated, the envelope tracking circuitry may continuously select bias voltages to provide to the amplifier based on the magnitude of signals that are transmitted and the calibration data. By actively adjusting the bias voltage in this way, power consumption may be minimized without generating undesirable harmonics or other radio-frequency performance requirement violations.
    Type: Grant
    Filed: October 27, 2014
    Date of Patent: January 3, 2017
    Assignee: Apple Inc.
    Inventors: Wassim El-Hassan, Gurusubrahmaniyan Subrahmaniyan Radhakrishnan
  • Patent number: 9526097
    Abstract: Provided are a communication apparatus and a method for receiving a response signal transmitted from a terminal configured with one or more downlink component carriers. The communication apparatus includes a transmitting section and a receiving section. The transmitting section is configured to transmit, to the terminal, downlink assignment information indicating one or more resources for downlink data, each of the one or more resources being assigned to one of the one or more downlink component carrier(s), and configured to transmit the downlink data to the terminal. The receiving section is configured to receive one or more response signals for the downlink data, which are transmitted from the terminal. The terminal makes the phase points of the response signals different in accordance with a number of downlink data which has been successively received.
    Type: Grant
    Filed: December 4, 2015
    Date of Patent: December 20, 2016
    Assignee: Sun Patent Trust
    Inventors: Seigo Nakao, Akihiko Nishio, Masayuki Hoshino, Ayako Horiuchi
  • Patent number: 9461861
    Abstract: A smart utility network (SUN) device that includes an orthogonal frequency-division multiplexing (OFDM)-based transmitter. The OFDM-based transmitter including a signal processor to convert data from a frequency-domain to a time-domain using an inverse fast Fourier transform (IFFT) and configured to perform a time-domain windowing function based on a Hanning window on OFDM symbols.
    Type: Grant
    Filed: October 8, 2013
    Date of Patent: October 4, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Anuj Batra, Timothy Mark Schmidl, Il Han Kim
  • Patent number: 9380351
    Abstract: Discussed is an apparatus for transmitting encoded video stream that may include an encoder configured to encode a video stream using a predetermined compression standard; a parser configured to subdivide the encoded video stream into a plurality of sub-streams and parse the sub-streams; a MUX configured to segregate a first data which is NAL unit having SPS, PPS, or slice header and a second data which is NAL unit having slice data from the parsed sub-stream; a first packet generator configured to generate a TCP packet using the first data by the sub-stream and transmit the TCP packet through a TCP tunnel; and a second packet generator configured to generate a UDP packet using the second data by the sub-stream and transmit the UDP packet through a UDP tunnel.
    Type: Grant
    Filed: January 17, 2014
    Date of Patent: June 28, 2016
    Assignee: LG Display Co., Ltd.
    Inventors: Jing Zhao, Ben Lee, Tae Wook Lee, Chang Gone Kim
  • Patent number: 9350577
    Abstract: The present invention relates to the field of communication and transmission of signals. In particular, the present invention relates to a new communication and/or modulation method. The present invention also relates to improving channel occupancy. The present specification discloses the adoption of phase transitions/changes in a manner that indicates a code by virtue of their position (timing) in the communication. This is referred to as Phase Position Modulation.
    Type: Grant
    Filed: January 21, 2008
    Date of Patent: May 24, 2016
    Assignee: SATO HOLDINGS CORPORATION
    Inventors: Graham Alexander Munro Murdoch, Stuart Colin Littlechild
  • Patent number: 9236994
    Abstract: Provided are a communication apparatus and a method for receiving a response signal transmitted from a terminal configured with one or more downlink component carriers. The communication apparatus includes a transmitting section and a receiving section. The transmitting section is configured to transmit, to the terminal, downlink assignment information indicating one or more resources for downlink data, each of the one or more resources being assigned to one of the one or more downlink component carrier(s), and configured to transmit the downlink data to the terminal. The receiving section is configured to receive one or more response signals for the downlink data, which are transmitted from the terminal. The terminal makes the phase points of the response signals different in accordance with a number of downlink data which has been successively received.
    Type: Grant
    Filed: September 16, 2014
    Date of Patent: January 12, 2016
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Seigo Nakao, Akihiko Nishio, Masayuki Hoshino, Ayako Horiuchi
  • Patent number: 9219600
    Abstract: Detecting timing of a synchronization sequence included in a data stream transmitted in a noisy channel. The synchronization sequence is a known data sequence purposely injected into the data stream for synchronization. A data stream waveform, is obtained from a noisy communication channel. The data stream waveform includes an instance of a synchronization sequence waveform. One or more samples of the synchronization sequence waveform are obtained. One or more samples of a model synchronization sequence waveform are obtained. The model synchronization sequence waveform models an expected waveform for the synchronization sequence being transmitted on the communication channel by applying the synchronization sequence to a model of the communication channel.
    Type: Grant
    Filed: February 25, 2015
    Date of Patent: December 22, 2015
    Assignee: L-3 Communications Corp.
    Inventors: David G. Landon, David S. Nelson, Robert L. Dickson, Brian G. Yoho, Carl Christensen
  • Patent number: 9197399
    Abstract: A method for processing a received digital signal includes generating a clock signal used for sampling the received signal by comparator which compares the received signal to a reference. A phase shifter adjusts the phase of the first clock signal to maximize the vertical eye opening of the signal at the sampling time. The phase of the clock signal may be adjusted in a first direction and a measure of vertical eye opening of the signal compared to a previous measure. If the measure of vertical eye opening has increased the signal another phase adjustment may be made in the same direction whereas if the vertical eye opening of the signal has decreased a further phase adjustment in the opposite direction may be made.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: November 24, 2015
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Ben Willcocks, Chris Born, Miguel Marquina, Andrew Sharratt, Allard Van Der Horst
  • Patent number: 9083445
    Abstract: A receiver includes a plurality of de-spreading correlators that are programmed to only correlate a specific portion of the full spreading code according to an interleave factor. Each correlator may be associated with a different symbol. The received signal may be received at all correlators and is multiplied by a code generated by a code generator according to the symbol associated with the correlator. While each correlator may be despreading the received signal at all times, an enable signal is used to determine when information for an associated cell should be accumulated for each correlator.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: July 14, 2015
    Assignee: Terrace Communications Corporation
    Inventor: Nathan Hays
  • Patent number: 9036730
    Abstract: Peak-to-average ratio reduction is achieved by detecting peaks in an original analog signal that exceed a given threshold. Segments of the original analog signal containing such peaks are treated (e.g., by attenuation) and a composite analog signal is assembled that includes treated and untreated segments of the original analog signal. The composite analog signal is processed to perform analog-to-digital conversion to generate a composite digital signal. Segments of the composite digital signal corresponding to the treated segments of the original analog signal are reverse-treated or otherwise treated again to undo treatment of the segments of the original analog signal. A final output digital signal is generated that corresponds to the original analog signal in digital form.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: May 19, 2015
    Assignee: IKANOS COMMUNICATIONS, INC.
    Inventors: Sylvain Flamant, Qasem Aldrubi, Echere Iroaga, Jason Hu
  • Patent number: 9032274
    Abstract: A multi-link input/output (I/O) interface uses both feed-forward and feedback signaling to reduce the impact of noise on data capture at a memory controller. To transfer data from a source module to a destination module, a defined pattern is communicated from the memory module along a master channel concurrent with the memory module providing data via one or more slave channels. Based on the phase of the defined pattern as it is received, the multi-link I/O interface feeds forward to the slave channels control signaling whose phase reflects a predicted noise pattern for the system. Each slave channel performs CDR by adjusting timing of its corresponding capture clock signal based on the fed forward control signaling and based on feedback signaling for the corresponding slave channel, whereby the feedback signaling reflects an error measurement between a phase of a capture clock signal and transitions in received data.
    Type: Grant
    Filed: May 21, 2013
    Date of Patent: May 12, 2015
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Shadi M. Barakat, Bhuvanachandran K. Nair, Paul-Hugo Lamarche
  • Patent number: 9025638
    Abstract: A receiver circuit provides improved noise estimation processing by at least partially removing receiver frequency error bias. An initial noise estimate is compensated using an error term based on the observed receiver frequency error, and the resulting compensated noise estimate can be used to improve other signal processing in the receiver. For example, the receiver may use compensated noise estimates to generate signal quality estimates, e.g., Signal-to-Interference (SIR) estimates, having improved accuracy. Additionally, or alternatively, the receiver may use the compensated noise estimates to generate RAKE combining weights having improved noise suppression characteristics. In an exemplary embodiment, the initial noise estimate is a noise correlation matrix generated from a received reference signal, e.g., pilot symbols, and the error term is an error matrix directly generated using he observed receiver frequency error and channel estimates taken from the reference signal.
    Type: Grant
    Filed: November 18, 2004
    Date of Patent: May 5, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Anders Wallén
  • Patent number: 9020459
    Abstract: An electronic circuit includes a receiver circuit (BSP) operable to perform coherent summations having a coherent summations time interval, and a power control circuit (2130) coupled to said receiver circuit (BSP) and operable to impress a power controlling duty cycle (TON, TOFF) on the receiver circuit (BSP) inside the coherent summations time interval. Other circuits, devices, systems, methods of operation and processes of manufacture are also disclosed.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: April 28, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Deric Wayne Waters, Karthik Ramasubramanian, Arun Raghupathy
  • Patent number: 9008165
    Abstract: An apparatus of automatic power control for burst mode laser transmitter and method are provided. In one implementation a method includes: pushing a first multi-bit data into a data memory; modifying the data memory to remove a condition of frequent transition in the data memory, if the condition of frequent transition is found; establishing a list of indices pointing to data transition of the data memory; and sequentially examining a respective run length of the data indexed by each entry in the list, modifying the associated data to lengthen the respective run length if the respective run length is too short, modifying the associated data to shorten the respective run length if the respective run length is too long, and outputting a second multi-bit data by taking data from the data memory.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: April 14, 2015
    Assignee: Realtek Semiconductor Corp.
    Inventor: Chi-Liang Lin
  • Patent number: 9008207
    Abstract: A system and methods for estimating a noise power level in an uplink signal for a virtual MIMO system is disclosed. The system comprises a demodulation reference signal (DMRS) module configured to obtain a DMRS receive symbol from the uplink signal and determine a DMRS sequence for a first UE in the virtual MIMO system. An autocorrelation module is configured to calculate an average autocorrelation value for the subcarriers in the uplink signal. A cross-correlation module is configured to calculate first and second cross-correlation values of the uplink signal RZ(l) for values of l selected such that the sum of the received power from the first UE and the second UE can be accurately estimated. A noise power level module is configured to determine the noise power level for the uplink signal using the average autocorrelation value and the first and second cross correlation values.
    Type: Grant
    Filed: October 11, 2010
    Date of Patent: April 14, 2015
    Assignee: Intel Corporation
    Inventors: Peng Cheng, Changlong Xu, Xuebin Yang, Feng Zhou, Yang Gao
  • Patent number: 9008246
    Abstract: The present technique relates to a transmission device, a transmission method, a reception device, a reception method, a program, and a communication system which can realize a system capable of promptly addressing a newly-generated disturbance wave. A broadcasting device of the present disclosure includes: a reception unit which receives reception interference information notified from the reception device; a setting unit which sets a frequency of a notch to be provided in a transmission signal on the basis of the reception interference information that has been received; a modulation unit which provides the notch in accordance with the set frequency of the notch while at the same time generates a modulated signal by modulating information to be transmitted; and a send-out unit which sends out the modulated signal as the transmission signal.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: April 14, 2015
    Assignee: Sony Corporation
    Inventors: Hiroo Takahashi, Takahiro Okada
  • Patent number: 9001929
    Abstract: A method and an apparatus for a transmitter to transmit data in a wireless communication system are provided. This method includes: generating a first signal field including at least one symbol; generating a second signal field configured by repeating at least one symbol of the first signal field; and transmitting a frame including the first signal field, the second signal field, and a data field and a first symbol of the second signal field is modulated through binary phase shift keying (BPSK) and symbols from a second symbol of the second signal field are modulated through Q-BPSK. According to the present invention, a service filed can be extended while maintaining compatibility with a wireless communication system in the related art by transmitting a frame using symbol repetition.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: April 7, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Il Gu Lee, Heejung Yu, Hun Sik Kang, Sok Kyu Lee
  • Patent number: 8995572
    Abstract: Systems and techniques relating to wireless communications are described. A described technique includes aligning a received data sequence with a transmitted data sequence to produce an aligned data sequence, the received data sequence being based on an output of a power amplifier having one or more nonlinear characteristics that is responsive to the transmitted data sequence; dividing the aligned data sequence into N segments; obtaining first nonlinear parameters for the power amplifier based at least on first segments of the N segments; obtaining a second nonlinear parameter(s) corresponding to a second segment(s) of the N segments based on an extrapolation of the first nonlinear parameters, the second segment(s) having a lower transmitted data sequence value(s) than the first segments; and performing digital predistortion on a transmit data sequence based on the nonlinear predistortion parameters to compensate for the one or more nonlinear characteristics of the power amplifier.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: March 31, 2015
    Assignee: Marvell International Ltd.
    Inventor: Songping Wu
  • Patent number: 8953716
    Abstract: Systems, methods, and other embodiments associated with a DC notch gear filter are described. According to one embodiment, an apparatus includes a digital high pass filter having a cutoff frequency and a gear mechanism configured to successively change the cutoff frequency of the high pass filter based on a sequence of cutoff frequencies. The apparatus also includes a direct current (DC) estimator configured to estimate a DC offset of a digital input signal to the high pass filter based, at least in part, on an output signal of the high pass filter as a cutoff frequency is successively changed. A direct current (DC) compensator is configured to subtract the estimated DC offset from the input signal to the high pass filter.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: February 10, 2015
    Assignee: Marvell International Ltd.
    Inventors: GuruGuha Venkatasubramanian, Balasubramanian Ramachandran
  • Patent number: 8948799
    Abstract: A method and apparatus are provided for a wireless communication system including a base station and at least one user equipment. A Channel Quality Indicator (CQI) table can be generated so that only an index corresponding to the measured CQI needs to be fed back to the base station. The CQI tables proposed herein may be suitable to different channel statistics, different Multiple Input Multiple Output (MIMO) mode and may be optimized based on either performance or implementation complexity. Multiple CQI tables may be formed into one compound CQI table. The CQI tables may be stored at both a base station and user equipment. The base station can select a CQI table from the set of tables. The base station signals the selection of the CQI table to the user equipment and the user equipment feeds back indices from the selected CQI table to the base station.
    Type: Grant
    Filed: June 25, 2009
    Date of Patent: February 3, 2015
    Assignee: Microsoft Corporation
    Inventors: Hua Xu, Dong-Sheng Yu, Ming Jia, Jianglei Ma
  • Patent number: 8938014
    Abstract: A serializer/deserializer for a network device includes a data module configured to generate parallel data and side band data. A serializer is configured to convert the parallel data to serialized data for transmission over a communication channel, wherein the serialized data includes a serial data waveform. A side band transmission module is configured to generate a clock signal, inject the clock signal with side band data to generate a modulated clock signal, and apply the modulated clock signal to the serialized data to generate a modified serial data waveform. The modified serial data waveform includes the serialized data and the side band data and includes pulses with an increased pulse width and/or a decreased pulse width with respect to the serial data waveform. The serializer is configured to transmit, over the communication channel, the modified serial data waveform including the serialized data and the side band data.
    Type: Grant
    Filed: September 6, 2013
    Date of Patent: January 20, 2015
    Assignee: Marvell International Ltd.
    Inventors: Gang Wang, Wei Zhou, Chee Hoe Chu, Po-Chien Chang
  • Patent number: 8923454
    Abstract: A method, an apparatus and a system for eliminating aliasing noise in a multi-carrier modulation system are disclosed. The method includes: acquiring a first power spectrum density template; acquiring information of in-band subcarriers whose aliasing noise is greater than background noise, and acquiring a difference between the aliasing noise and the background noise of the in-band subcarriers; adjusting the first power spectrum density template according to the information of the in-band subcarriers and the corresponding difference to obtain a second power spectrum density template; and sending signals according to the second power spectrum density template. The method, the apparatus, and the system disclosed herein eliminate the aliasing crosstalk noise, improve the performance and stability of in-band services without involving upgrade or modification of the Customer Premises Equipment (CPE), and are easy to implement.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: December 30, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Huijian Bo, Tao Wu, Yongjun Zhang
  • Patent number: 8917780
    Abstract: An apparatus for providing improved color intensity mapping may include a processor. The processor may be configured to divide color intensity value byte data into high priority portions and low priority portions distributed as constellation points in a constellation matrix and to provide separation between each of the constellation points by assigning a unique mapping code to a plurality of the constellation points.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: December 23, 2014
    Assignee: Core Wireless Licensing S.A.R.L.
    Inventor: Mahbod Eyvazkhani
  • Patent number: 8908749
    Abstract: A method for controlling DSL transmission power includes: determining a group to which a line belongs, and selecting a representative line from each group to form a line model; obtaining a crosstalk model of the line model; obtaining Transmit Power Spectrum Density (TxPSD) of each representative line in the line model according to the crosstalk model, and converting the TxPSD into a spectrum control parameter; and enhancing the line rate according to the spectrum control parameter. An apparatus for controlling DSL transmission power is also disclosed. Through the method, the transmission power of the band that incurs serious line crosstalk is restricted, and the line that incurs serious crosstalk can achieve higher transmission rates. Therefore, the adverse impact from the crosstalk between xDSL lines is reduced, and the line works in the optimum state.
    Type: Grant
    Filed: August 31, 2009
    Date of Patent: December 9, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Liming Fang
  • Patent number: 8907604
    Abstract: An optimized pseudo-random period pattern can reduce audible noise in a system that includes an inverter circuit configured to provide power to an electric machine. A system can include a PWM optimization module (POM) comprising the PPP. A carrier period for a carrier signal used to provide PWM inverter drive signals can be selected in accordance with the PPP. The PPP can be expressed as an array of 200-400 elements, each element a period belonging to a finite set of 2 or more predetermined periods. A period can be selected by index from the array, and the index incremented to progress through the PPP, which can be repeated upon its completion. The PPP can be optimized to reduce audible noise while mitigating inverter losses. Modeling techniques can determine the number of array elements, the number of possible periods, and the period values that optimize the PPP.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: December 9, 2014
    Assignee: Ford Global Technologies, LLC
    Inventors: Jami J. Miller, Michael W. Degner, Scott Xiong Yu, William C. Reynolds
  • Patent number: 8907973
    Abstract: An image processor includes generates a content adaptive kernel from an image block with noise of a luminance component signal with a low resolution. The content adaptive kernel is convolved with the luminance component signal. A noise signal and an extracted texture which excludes noise are generated. The luminance component signal is filtered as function of the noise signal to generate an enhanced luminance component signal. Horizontal and vertical scaling is performed on the enhanced luminance component signal, the extracted texture, and the luminance component signal, with the luminance component signal adaptively scaled as a function of the extracted texture. The horizontally and vertically scaled enhanced luminance component signal, extracted texture and luminance component signal are then combined to generate an output luminance component signal with a high resolution.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: December 9, 2014
    Assignee: STMicroelectronics International N.V.
    Inventor: Chandranath Manchi
  • Patent number: 8902530
    Abstract: A set of decisions is determined based at last in part on a set of samples. For a given sample in the set of samples, a low frequency noise estimate is estimated based at least in part on (1) at least some samples from the set of samples and (2) at least some decisions from the set of decisions. A reduced noise sample is generated by removing the low frequency noise estimate from the given sample.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: December 2, 2014
    Assignee: SK hynix memory solutions inc.
    Inventors: Zheng Wu, Jason Bellorado, Naveen Kumar, Marcus Marrow
  • Patent number: 8903007
    Abstract: Embodiments of the present disclosure disclose a method and an apparatus for determining a precoding matrix, which relate to the field of communications technologies and may improve throughput of a MIMO system and optimize overall system performance, including: determining a rank constraint of a jth transmitting end, where j=1, 2, . . . , K, and K is the total number of transmitting ends in a MIMO system; iteratively calculating an optimal precoding matrix of the jth transmitting end according to a channel matrix from the jth transmitting end to a jth receiving end, an autocorrelation matrix of interference and noise of the jth receiving end, and the rank constraint of the jth transmitting end, where the optimal precoding matrix maximizes channel capacity of a link from the jth transmitting end to the jth receiving end under a circumstance that precoding matrices of other transmitting ends do not change.
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: December 2, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Rui Wang, Hao Yu, Kinnang Lau
  • Patent number: 8902958
    Abstract: A data collector combiner, a network management system, a DSL Optimizer (DSLO), or any combination thereof collects data, parameter(s), characteristic(s), information, or any combination thereof from two or more data sources. The data collector probabilistically combines at least the first and second data to estimate at least one DSL characterizing parameter.
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: December 2, 2014
    Assignees: Adaptive Spectrum and Signal Alignment, Inc., AT&T Intellectual Property I, L.P.
    Inventors: George Ginis, Mark H. Brady, Stuart Lynch Blackburn
  • Patent number: 8897391
    Abstract: A distortion compensator compensates for distortion of a signal caused by an amplifier. A storage section stores a plurality of compensation coefficients used for distortion compensation. A selection section selects a compensation coefficient corresponding to an index value indicative of a power level of the signal from among the plurality of compensation coefficients. The selection section determines whether or not the power level is higher than a threshold, and uses, based on a determination result, a first index value calculated without using a logarithmic operation or a second index value calculated by using a logarithmic operation.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: November 25, 2014
    Assignee: Fujitsu Limited
    Inventors: Daisuke Masunaga, Satoshi Matsubara, Takeshi Ohba, Hideharu Shako
  • Patent number: 8897182
    Abstract: The present disclosure relates to an apparatus and a method for transmitting muting information in a wireless communication system, and to an apparatus and a method for acquiring channel state using same. In an exemplary embodiment, muting information includes: a first data field, having a serving cell for receiving from peripheral cells in a multi-cell environment, at least one of a CSI-RS pattern, the number of CSI-RS antenna ports, a CSI-RS duty cycle, and CSI-RS transmission subframe offset information, and using same for expressing the cycle and the offset of muting subframes, which pertain to information on a resource block that can generate interference between the peripheral cells and CSI-RS; and a second data field for expressing a specific muting pattern, which must be muted within the muting subframes, having either 12 bits or 28 bits that display muting application in a bitmap format.
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: November 25, 2014
    Assignee: Pantech Co., Ltd.
    Inventors: Sungjun Yoon, Kyoungmin Park, Sungjin Suh