Antinoise Or Distortion Patents (Class 375/284)
  • Patent number: 11637573
    Abstract: An apparatus comprises a digital processing device configured to generate a digital transmission signal, a digital-to-analog converter connected to the digital processing device and configured to convert the digital transmission signal into an analog transmission signal, and a power amplifier connected to the digital-to-analog converter and configured to amplify the analog transmission signal. An antenna filter is connected to the power amplifier and configured to filter the amplified analog transmission signal; the antenna filter is configured to pass frequencies in at least one passband and to attenuate frequencies in at least one stopband. The digital processing device is configured to perform a process of reducing peak power in the digital transmission signal; in this process error components having different frequencies are produced. A frequency spectrum of the error components is manipulated such that a part of the error components is deposited in the stopband of the antenna filter.
    Type: Grant
    Filed: October 10, 2022
    Date of Patent: April 25, 2023
    Assignee: NOKIA SOLUTIONS AND NETWORKS OY
    Inventors: Gunter Wolff, Radoslaw Ceszkiel, Grzegorz Haza, Björn Jelonnek, Michael Weber
  • Patent number: 11444665
    Abstract: Embodiments of this application provide example information receiving methods and receiving apparatuses. One example information receiving method includes receiving, by a receiving apparatus, an index from a sending apparatus, wherein the index indicates precoding information used for a single codeword. The receiving apparatus can then determine, based on the index, the precoding information used for the single codeword.
    Type: Grant
    Filed: July 15, 2020
    Date of Patent: September 13, 2022
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Liyan Su
  • Patent number: 11394597
    Abstract: Methods, systems, and apparatuses provide a transmitter architecture that directly generates 4N-QAM constellation using a raw bit stream as input and that does not require a digital-to-analog converter (DAC) in the signal path.
    Type: Grant
    Filed: January 29, 2021
    Date of Patent: July 19, 2022
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Seyed Mohammad Hossein Mohammadnezhad, Huan Wang, Payam Heydari
  • Patent number: 11223386
    Abstract: Binary data is processed through a differential pre-encoder, which includes a simple modulo-2 addition. This step is used to cancel the propagation error that can be introduced by duo-binary modulation and to simplify demodulation. Next the duo-binary encoder introduces controlled Inter Symbol Interference between a previously sent bit and a present bit to compress the spectral density closer to the DC. Next a 60-GHz carrier is modulated and transmitted over differential transmission lines.
    Type: Grant
    Filed: May 19, 2020
    Date of Patent: January 11, 2022
    Assignee: STMicroelectronics SA
    Inventors: Mohammed Tmimi, Philippe Galy
  • Patent number: 11089555
    Abstract: Some techniques and apparatuses described herein permit a user equipment (UE) to transition among different power configurations, which include different values for different power parameters, that impact an amount of power consumed by the UE. In some aspects, these transitions may be signaled by a base station based at least in part on traffic volume for the UE, which may assist with improving throughput and/or extending battery life of the UE. Furthermore, these transitions may be signaled dynamically, such as in downlink control information (DCI) and/or a medium access control (MAC) control element (CE) MAC-CE, which may conserve battery power and/or network resources as compared to reconfiguring the UE using an RRC message, and which may allow the UE to be reconfigured quickly as conditions associated with the UE change.
    Type: Grant
    Filed: December 23, 2019
    Date of Patent: August 10, 2021
    Assignee: QUALCOMM Incorporated
    Inventors: Huilin Xu, Peter Pui Lok Ang, Wanshi Chen, Joseph Binamira Soriaga, Linhai He
  • Patent number: 10938618
    Abstract: Disclosed is a device capable of compensating for amplitude-modulation to phase-modulation distortion. The device includes a transmitter and a controller. The transmitter includes an amplifier circuit, a phase-shift adjustment circuit, and an output circuit. The amplifier circuit is configured to output an amplified signal according to an input signal. The phase-shift adjustment circuit, set between the amplifier circuit and the output circuit, includes at least one of an adjustable capacitor and an adjustable inductor and is configured to adjust the phase shift of the amplified signal according to a control signal. The output circuit is configured to output an output signal according to the amplified signal. The controller is configured to generate the control signal according to the input signal, in which the control signal varies with the input signal.
    Type: Grant
    Filed: November 13, 2019
    Date of Patent: March 2, 2021
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventor: Wen-Shan Wang
  • Patent number: 10939497
    Abstract: The present invention offers significant improvements in the performance of a radio receiver operating in an environment with high desired band interference. The present invention comprises a high selectivity RF circuit that is located between the antenna and the radio receiver, and utilizes superheterodyne technology to filter adjacent channel interference in the desired band frequency spectrum. This type of interference is problematic for IEEE 802.11 radio receivers that are implemented with the popular direct conversion radio receiver architectures.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: March 2, 2021
    Assignee: Ubiquiti Inc.
    Inventors: Robert J Pera, Lance D. Lascari
  • Patent number: 10686490
    Abstract: Methods, systems, and devices for wireless communications are described. A UE may use different modulation schemes, or different modulators, for a single data stream. The set of modulators may be based on a linear combination of a function of encoded bits to be transmitted. In some cases, the UE may use a different permutation or interleaving of the function of bits with the same linear function to generate a different set of modulators. The UE may use a combination of any one or more of the described techniques for generating a set of modulators. Different modulators may be cyclically repeated over time. The UE may apply a device-specific scrambling sequence and transmit the modulated symbols on an uplink channel. The base station may use matched filters and an element-wise estimator (ESE) to compute log-likelihood ratios (LLRs) for each bit of each UE in a received signal.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: June 16, 2020
    Assignee: QUALCOMM Incorporated
    Inventors: Seyong Park, Pinar Sen, Naga Bhushan, Tingfang Ji
  • Patent number: 10623032
    Abstract: There is provided a transmission device including a transmission unit that has a function of transmitting a transmission signal with a reduced influence of reflection noise in transmission data after data transition on the basis of the transmission data. The transmission device is connected to a transmission line. Also provided is a reception device connected to the transmission line. The reception device receives data transmitted from the transmission device.
    Type: Grant
    Filed: July 11, 2017
    Date of Patent: April 14, 2020
    Assignee: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Hiroaki Hayashi, Masatsugu Sugano
  • Patent number: 10080254
    Abstract: The present invention offers significant improvements in the performance of a radio receiver operating in an environment with high desired band interference. The present invention comprises a high selectivity RF circuit that is located between the antenna and the radio receiver, and utilizes superheterodyne technology to filter adjacent channel interference in the desired band frequency spectrum. This type of interference is problematic for IEEE 802.11 radio receivers that are implemented with the popular direct conversion radio receiver architectures.
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: September 18, 2018
    Assignee: Ubiquiti Networks, Inc.
    Inventors: Robert J. Pera, Lance D. Lascari
  • Patent number: 10050817
    Abstract: A method and system uses a constrained set of indexed samples to identify a next generation population of samples that exhibits a more desirable signal characteristic such as lower PAPR, out-of-band emission and error vector magnitude. The invention generates an intermediate set of indexed samples which are subjected to a fitness function and next generation calculations to produce next generation indexes for the next population of samples. The next generation indexes population of samples is further constrained over initial indexes for generating a more desirable signal characteristic. In dynamic spectrum access networks having OFDM components, the interference between collections of overlay and underlay signals is adaptively controlled based on the composite PAPR. In an example, the total out-of-band interference for the collection of overlay and underlay signals for all samples of the population are reduced.
    Type: Grant
    Filed: November 26, 2016
    Date of Patent: August 14, 2018
    Inventor: John David Terry
  • Patent number: 9042479
    Abstract: Apparatuses and methods for avoiding interference between wireless systems are described herein. One embodiment of the disclosure provides an apparatus for avoiding interference between at least one transmitter and at least one receiver within at least one wireless device. The apparatus comprises a first processing circuit configured to determine whether one or more bins are affected by interference from a transmitter based on predetermined information.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: May 26, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: Alecsander Eitan
  • 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: 9020026
    Abstract: A method and system for compensating for frequency dependent phase and amplitude imbalances is provided. A plurality of frequency sub-bands is extracted from a received wideband signal. Each of the plurality of frequency sub-bands is compensated to produce an associated plurality of compensated frequency sub-bands. The compensated sub-bands are summed in order to produce a compensated signal.
    Type: Grant
    Filed: January 6, 2011
    Date of Patent: April 28, 2015
    Assignee: LGS Innovations LLC
    Inventor: Robert L. Cupo
  • Patent number: 9020052
    Abstract: A stream of information is communicated by means of transmission distributed over a plurality of transmission antennas and reception distributed over a plurality of reception antennas. In the method the stream is encoded according to an error correcting code, into a series of multi-bit symbols. A sequence of the multi-bit symbols is interleaved, by which symbols are assigned to time slots, so that the multiple bits of the symbols remain together in the same time slot. The interleaved multi-bit symbols are transmitted, with each symbol distributed over the transmission antennas in a respective time slot. Signals received at the reception antennas in each respective time slot are received and demodulated, to produce demodulation results each for a respective time slot. A time-slot sequence of the demodulation results is deinterleaved. Decoded symbol values are selected under a constraint that a series of the selected symbols belongs to the error correcting code.
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: April 28, 2015
    Assignee: Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijke Onderzoek TNO
    Inventor: Haibin Zhang
  • Patent number: 9008167
    Abstract: Logic may comprise a single phase tracking implementation for all bandwidths of operation and the logic may adaptively change pre-defined and stored track parameters if the receiving packet is 1 MHz bandwidth. Logic may detect a packet and long training fields before performing a 1 MHz classification. Logic may auto-detect 1 MHz bandwidth transmissions by a property of the long training field sequences. Logic may auto-detect 1 MHz bandwidth transmissions by detecting a Binary Phase Shift Keying (BPSK) modulated first signal field symbol rather than the Quadrature Binary Phase Shift Keying (QBPSK) associated with the 2 MHz or greater bandwidth transmissions. Logic may perform an algorithm to determine an estimated phase correction value for a given orthogonal frequency division multiplexing symbol and several embodiments integrate this value with an intercept multiplier that may be 0.2 for 1 MHz transmissions and, e.g., 0.5 for 2 MHz or greater bandwidth communication.
    Type: Grant
    Filed: December 29, 2012
    Date of Patent: April 14, 2015
    Assignee: Intel Corporation
    Inventors: Shahrnaz Azizi, Eldad Perahia, Thomas J. Kenney
  • Patent number: 9001947
    Abstract: A receiver includes a first receiver chain configured to receive a first input signal and a second receiver chain configured to receive a second input signal. A first phase predistorter is provided in the first receiver chain and is configured to shift a phase of the first input signal by a first phase shift ??A(f). A combiner is coupled to the first receiver chain and the second receiver chain and combines the first and second input signals. The first phase shift is selected to cause undesired signal components received in the first and second input signals to combine destructively.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: April 7, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Mark Wyville
  • Patent number: 9001913
    Abstract: A method implemented in a multicarrier transmission system, the method comprising generating a plurality of constellation points by using one or more constellation mappers to map a plurality of special data sequences for an idle data transmission unit (IDTU), wherein the plurality of special data sequences are computed prior to the mapping such that the plurality of constellation points are essentially inner constellation points, wherein each of the inner constellation points resides in a constellation diagram that corresponds to one of a plurality of subcarriers used by the IDTU, and wherein the constellation diagram comprises a number of inner constellation points and a number of outer constellation points, with the inner constellation points being closer from an origin of the constellation diagram than the outer constellation points, and transmitting the plurality of constellation points.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: April 7, 2015
    Assignee: Futurewei Technologies, Inc.
    Inventors: Ruxiang Wang, Guozhu Long, Yan Zhang, Amir H. Fazlollahi
  • Patent number: 9001918
    Abstract: A communication apparatus and method in a wireless communication system that support multiple Orthogonal Frequency Division Multiplexing (OFDM) parameter sets. A method includes determining a respective OFDM parameter set for each of multiple Radio Frequency (RF) chains; and processing an OFDM signal in each of the multiple RF chains based on a parameter value defined in the respective OFDM parameter set.
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: April 7, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Rakesh Taori, Shuangfeng Han
  • Patent number: 8995594
    Abstract: Briefly, in accordance with one or more embodiments, a platform may comprise a receiver to receive a signal that includes an error in the received signal due to a noise signal generated in the platform, and a processor configured to calculate a noise vector from a source of the noise signal and to send the noise vector to the receiver, The receiver may include a digital signal processor configured to estimate an error vector based at least in part on the noise vector and to subtract the estimated error vector from the received signal to cancel the noise signal from the received signal. The noise cancelled from the received signal may include platform noise generated by a bus, a memory circuit, a clock, a power supply, a circuit ground or integrated circuit substrate, or input/output circuit of the platform.
    Type: Grant
    Filed: August 22, 2012
    Date of Patent: March 31, 2015
    Assignee: Intel Corporation
    Inventors: Dawson W. Kesling, Andrew W. Martwick
  • Patent number: 8995568
    Abstract: Devices, systems, methods, and other embodiments associated with phase based transformation of repeated signals are described. In one embodiment, an apparatus includes duplication logic configured to duplicate a string of data to form a duplicate string of data. Transformation logic is configured to modify phases associated with the string of data to generate a modified string of data. Signal generation logic is configured to generate a signal for wireless transmission where the signal having at least the modified string of data and the duplicate string of data.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: March 31, 2015
    Assignee: Marvell International Ltd.
    Inventors: Songping Wu, Quan Zhou, Manyuan Shen, Hongyuan Zhang, Hui-Ling Lou
  • Patent number: 8989288
    Abstract: The present disclosure relates to a method for common pilot configuration, the method comprising steps of: determining information related to UEs served by a BS; and configuring transmission of at least one common pilot from the BS to the served UEs based on the determined UE related information. In an example 4-branch MIMO system, at most 4 common pilots are configurable to be transmitted, and the at least one common pilot is two common pilots newly introduced into a legacy system.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: March 24, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Jinhua Liu, Bo Goransson, Xinyu Gu, Qingyu Miao, Zhang Zhang
  • Patent number: 8989323
    Abstract: An outdoor radio communication system comprises a first radio unit, a second radio unit, and a single cable coupling the first radio unit to the second radio unit. Each radio unit includes a downconverter, a radio processor that is communicatively coupled to the downconverter, and a XPIC module. The cable further includes a first twisted-pair of wires for communicatively coupling the first downconverter to the second XPIC module and a second twisted-pair of wires for communicatively coupling the second downconverter to the first XPIC module. The first XPIC module generates a first reference signal using a signal from the second downconverter to cancel cross-polarization interference in an output signal of the first radio processor. Similarly, the second XPIC module generates a second reference signal using a signal from the first downconverter to cancel cross-polarization interference in an output signal of the second radio processor.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: March 24, 2015
    Assignee: ZTE (USA) Inc.
    Inventors: Dong Hong Yom, Ying Shen
  • Patent number: 8971828
    Abstract: The embodiments of the present invention provide a predistortion device, method for predistortion and transmitter/receiver system. The predistortion device comprises a predistortion unit, and the predistortion device further comprises: a signal acquiring unit to process the output signals of a transmitting circuit to obtain distorted signals; a signal coupling unit to couple the distorted signals acquired by the signal acquiring unit to the receiving signals inputted to a receiving circuit; and a signal processing unit to decouple the output signals of the receiving circuit to acquire the distorted signals and the receiving signals. With the embodiments of the present invention, an analog receiving circuit may be reused in a half duplexing system and a full duplexing system, and the requirement on the analog receiving circuit is lowered, thereby reducing the cost.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: March 3, 2015
    Assignee: Fujitsu Limited
    Inventors: Jianmin Zhou, Pei Chen, Hui Li, Zhan Shi
  • Patent number: 8964875
    Abstract: A transceiver includes an input node to receive an input signal having in-phase (I) data and quadrature (Q) data, the input signal including several data samples. A correlation module determines an autocorrelation of the in-phase data, an autocorrelation of the quadrature data, a difference between the autocorrelation of the in-phase data and the autocorrelation of the quadrature data, and a cross correlation between the in-phase data and the quadrature data. An averaging module determines an average of the difference between the autocorrelation of the in-phase data and the autocorrelation of the quadrature data, and an average of the cross correlation between the in-phase data and the quadrature data, in which the averages are determined over a specified number of data samples.
    Type: Grant
    Filed: June 10, 2013
    Date of Patent: February 24, 2015
    Assignee: MStar Semiconductor, Inc.
    Inventor: Khurram Muhammad
  • Patent number: 8958508
    Abstract: A method and system for measuring noise of a machine are disclosed by the present invention, and the method includes: acquiring a first noise interference set, searching for noise interferences which are less than a preset noise interference threshold from the first noise interference set to obtain a second noise interference set, and then calculating an average value of the second noise interference set; and determining whether the average value of the second noise interference set is less than or equal to a set threshold, and if the average value of the second noise interference set is less than or equal to the set threshold, the current noise of the machine is equal to the average value of the second noise interference set. With the present invention, a more accurate measurement value of the noise of the machine can be obtained.
    Type: Grant
    Filed: June 9, 2010
    Date of Patent: February 17, 2015
    Assignee: ZTE Corporation
    Inventors: Xiaoming Su, Yujie Li
  • Patent number: 8948293
    Abstract: A base station selects a subset of at least one geographically separated antennas for each of the plurality of user equipments. The base station forms at least layer of data stream including modulated symbols, precodes the data stream via multiplication with the NT-by-N precoding matrix where N is the number of said layers and NT is the number of transmit antenna elements and transmits the precoded layers of data stream to the user equipment via the selected geographically separated antennas. The base station signals the subset of the plurality of geographically separated antennas via higher layer Radio Resource Control or via a down link grant mechanism. The base station optionally does not signal the subset of the plurality of geographically separated antennas to the corresponding mobile user equipment.
    Type: Grant
    Filed: April 20, 2012
    Date of Patent: February 3, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Eko Onggosanusi, Vikram Chandrasekhar, Runhua Chen
  • Patent number: 8923434
    Abstract: A method and an apparatus for modifying a complex-valued signal are described, the complex-valued signal representing a first symbol and a second symbol. A signal trajectory of the complex-valued signal between the first and second symbols is determined, and, if the signal trajectory passes nearby the constellation origin, the signal trajectory is altered to run closer to the constellation origin.
    Type: Grant
    Filed: February 11, 2013
    Date of Patent: December 30, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Andreas Menkhoff, Staffan Sahlin
  • Patent number: 8897385
    Abstract: A method of estimating the Doppler spread of a communication channel includes computing a first sum defined by a difference between the pilot tones of a first group of N symbols and a corresponding pilot tones of a second group of N symbols preceding the first group of N symbols, computing a second sum defined by the pilot tones of the second group of N symbols, and computing a ratio of the first sum and the second sum for each of the N symbols of the first and second group of symbols to generate N ratios representative of the Doppler spread of the channel. The first sum is further defined by the square of the difference between the pilot tones of the first group of N symbols and the corresponding pilot tones of the second group of N symbols.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: November 25, 2014
    Assignee: MaxLinear, Inc.
    Inventor: Sridhar Ramesh
  • Patent number: 8891662
    Abstract: Provided is a data transmission apparatus to transmit a reference orthogonal frequency division multiplexing (OFDM) symbol generated by frequency division multiplexing a reference symbol and a data symbol, and a data reception apparatus to estimate a channel using the reference OFDM symbol. Since the reference symbol and the data symbol are frequency division multiplexed, a Peak to Average Power Ratio (PAPR) may not increase greatly, and the transmission apparatus may transmit the reference OFDM symbol to the data reception apparatus more frequently. Accordingly, the data reception apparatus may estimate a channel accurately.
    Type: Grant
    Filed: June 14, 2010
    Date of Patent: November 18, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Byung Jang Jeong, Bangwon Seo, Jae Young Ahn
  • Patent number: 8867659
    Abstract: A communications device includes a transmitter, a transmission processing device, a receiver, and a reception processing device. The transmission processing device assigns signal-space points within an I/Q signal space to digital signals, which include data values. The reception processing device assigns data values to signal-space points. The transmitter generates a transmission signal from signal-space points to be transmitted. The receiver determines received signal-space points from a received signal. The individual transmitted and received signal-space points provide in each case a smaller spacing distance from adjacent signal-space points than from the origin of the signal space.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: October 21, 2014
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventor: Detlev Liebl
  • Patent number: 8861662
    Abstract: A method includes receiving reference signals in a mobile communication terminal, which is designed to receive data-carrying signals that are transmitted from a base station using one of multiple predefined Modulation and Coding Schemes (MCSs). One or more pre-calculated mappings between Signal-to-Noise Ratio (SNR) and error rate for one or more of the MCSs are held in the communication terminal. The pre-calculated mappings are adjusted according to one or more transmission parameters of the data-carrying signals. Measures indicative of respective actual spectral efficiencies that are achievable by the MCSs are estimated based on the adjusted mappings using the received reference signals. A preferred MCS is selected based on the estimated measures, and feedback that is indicative of the preferred MCS is sent to the base station.
    Type: Grant
    Filed: February 13, 2014
    Date of Patent: October 14, 2014
    Assignee: Marvell International Ltd.
    Inventors: Yona Perets, Daniel Yellin, Ezer Melzer
  • Patent number: 8842766
    Abstract: An apparatus and method for reducing interference signals using multiphase clocks. An integrated circuit includes a digital circuit and an analog circuit. The digital circuit includes a derived clock circuit configured to receive a root clock having a frequency D*f, D being a divide factor, to divide the root clock by D, and generate multiphase clocks having N phases. N circuits of the digital circuit are configured to receive a corresponding one of the N phases, with edges of the multiphase clocks being spread over the N phases. The multiphase clocks cause a frequency shift in interference signals generated by reduced periodic peak currents drawn by the N circuits from f to N*f and harmonics thereof. The analog circuit receives an in-band range of signals. A value of N is configured to shift the interference signals outside the in-band range of signals.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: September 23, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Indu Prathapan, Anjana Ghosh, Diganta Baishya, Sundarrajan Rangachari, Sankar Prasad Debnath, Ranjit Kumar Dash, Srinath Mathur Ramaswamy
  • Patent number: 8837625
    Abstract: A method of transmitting control information in a wireless communication system is provided. The method includes configuring downlink control information including a plurality of information fields according to a format of scheduling for transmission of a single codeword in a spatial multiplexing mode, wherein the plurality of information fields include a precoding matrix indicator (PMI) confirmation filed for indicating whether precoding is performed on downlink data by using a PMI reported by a user equipment and a transmitted precoding matrix indicator (TPMI) information field for indicating a codebook index, and at least one of the PMI confirmation field and the TPMI information field indicates an offset value of power for the downlink data transmission or interference information for the downlink data transmission, and transmitting the downlink control information.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: September 16, 2014
    Assignee: LG Electronics Inc.
    Inventors: Hyun Soo Ko, Jaho Koo, Jae Hoon Chung, Moon Il Lee
  • Patent number: 8831129
    Abstract: A method, an apparatus, and a system for transmitting information bits, where the method for transmitting information bits includes: dividing the information bits to be transmitted into at least two groups; encoding the information bits to be transmitted in each group; modulating the coded bits obtained by the encoding to obtain modulation symbols, in which each modulation symbol is obtained by using the modulation of the coded bits in the same group; and mapping and transmitting the modulation symbols. In this way, the receiving end easily reduces the algorithm complexity, thereby ensuring the performance of the receiving end.
    Type: Grant
    Filed: May 10, 2011
    Date of Patent: September 9, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Xiaofeng Chen, Yongxia Lv, Yan Cheng
  • Patent number: 8817907
    Abstract: The measurement of far-end crosstalk (FEXT) in a Digital Subscriber Line communications is instrumental in the ability of using a multiple input multiple output (MIMO) pre-coder to cancel FEXT. A reliable robust back channel for transmission of error is instrumental to provide error samples for the proper operation of a MIMO pre-coder. Bins can be dedicated to insure bandwidth from the customer premises equipment (CPE) to the central office (CO). By increasing the margin used in the bins, robustness can be added to this back channel between the CPE and CO.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: August 26, 2014
    Assignee: Ikanos Communications, Inc.
    Inventors: Massimo Sorbara, Patrick Duvaut, Amitkumar Mahadevan, Laurent Francis Alloin
  • Patent number: 8787491
    Abstract: The disclosure discloses a method for generating a reference signal. The method includes: a user equipment receiving a first signaling carrying reference signal solution information sent by a base station, wherein the reference signal solution information has at least one mapping relation with at least one piece of orthogonal code configuration information and at least one hopping mode, and the at least one mapping relation is stored in the base station and the user equipment; determining a corresponding piece of orthogonal code configuration information and a corresponding hopping mode according to the received reference signal solution information and the stored at least one mapping relation; and generating a reference signal according to the determined piece of orthogonal code configuration information and the determined hopping mode.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: July 22, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Mingyu Zhou, Yuan Xia, Qiang Li, Zuomin Wu
  • Patent number: 8767865
    Abstract: A wireless station of the present invention includes: a synchronization unit configured to synchronize with a transmission suspension period of a transmitting station of a wireless system, a measurement unit configured to measure a reception level of a wireless signal of said transmitting station in a transmission period and a reception level in the transmission suspension period, and an interference estimation unit configured to estimate an amount of interference to another wireless system according to the measured reception level in the transmission suspension period and reception level in the transmission period.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: July 1, 2014
    Assignee: NEC Corporation
    Inventor: Kazushi Muraoka
  • Patent number: 8744023
    Abstract: Systems and methods are provided for whitening noise of a received signal vector in a multiple-input multiple-output (MIMO) transmission or storage system. The whitening filter may be designed to whiten an interference component of the received signal vector, where the interference component is derived from modeling transmitter and receiver imperfections as a first coupling between MIMO transmitter outputs and a second coupling between MIMO receiver. The whitening filter may be computed based on the covariance matrix of the interference component.
    Type: Grant
    Filed: November 28, 2007
    Date of Patent: June 3, 2014
    Assignee: Marvell International Ltd.
    Inventors: Leilei Song, Rohit U. Nabar, Kedar Shirali
  • Patent number: 8724731
    Abstract: Signals propagating from an aggressor communication channel can cause detrimental interference in a victim communication channel. One or more noise cancellers can generate an interference compensation signal to suppress or cancel the interference based on one or more settings. A controller can execute algorithms to find preferred settings for the noise canceller(s). The controller can use a feedback signal (e.g., receive signal quality indicator) received from a victim receiver during the execution of the algorithm(s) to find the preferred settings. One exemplary algorithm includes sequentially evaluating the feedback resulting from a predetermined list of settings. Another algorithm includes determining whether to move from one setting to the next based on the feedback values for both settings. Yet another algorithm includes evaluating a number of sample settings to determine which of the sample settings result in a better feedback value and searching around that sample setting for a preferred setting.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: May 13, 2014
    Assignee: Intersil Americas Inc.
    Inventors: Wilhelm Steffen Hahn, Wei Chen
  • Patent number: 8718164
    Abstract: Techniques for transmitting pilot and for processing received pilot to obtain channel and interference estimates are described. A terminal may generate pilot symbols for a first cluster in a time frequency block based on a first sequence and may generate pilot symbols for a second cluster in the time frequency block based on a second sequence. The first and second sequences may include common elements arranged in different orders and may be considered as different versions of a single sequence. The terminal may transmit the pilot symbols in their respective clusters. A base station may obtain received pilot symbols from multiple clusters in the time frequency block. The base station may form each of multiple basis vectors with multiple versions of the sequence assigned to the terminal and may process the received pilot symbols with the multiple basis vectors to obtain a channel estimate for the terminal.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: May 6, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Petru Cristian Budianu, Dhananjay Ashok Gore, Alexei Yurievitch Gorokhov
  • Publication number: 20140093008
    Abstract: An approach is provided for high penetration alerting in a mobile satellite system. A message is generated for transmission to a wireless terminal. The message is partitioned into a number of symbols, each symbol composed of a portion of the message. The symbols are encoded via FEC coding to generate outer coded symbols, and each outer coded symbol is encoded based on a corresponding binary orthogonal sequence. The inner coded symbols are modulated based on a binary modulation scheme, and pulse shaped to generate message bursts for transmission to the wireless terminal. Each message burst reflects a group of the inner coded symbols, wherein the grouping of the inner coded symbols facilitates joint sequence detection by the wireless terminal, and each message burst exhibits relatively low peak-to-average power ratio.
    Type: Application
    Filed: October 3, 2013
    Publication date: April 3, 2014
    Applicant: Hughes Network Systems
    Inventors: James Jehong JONG, Harish RAMCHANDRAN, Jun WANG, Channasandra RAVISHANKAR
  • Patent number: 8687684
    Abstract: A calibration technique to compensate for the phase error between the in-phase and quadrature sampling clocks controlling the quadrature bandpass sampling delta-sigma analog-to-digital demodulator (QBS-ADD) is provided. A low-frequency test tone is injected, up-converted to the RF frequency, and added to an input of the QBS-ADD. The test tone is demodulated by the QBS-ADD into an in-phase signal and a quadrature signal. The in-phase and quadrature signals are filtered and multiplied together to generate a phase error signal, which is subsequently integrated to generate a phase shift control signal being used to correct the phase error between the in-phase and quadrature sampling clocks.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: April 1, 2014
    Inventor: Phuong Thu-Minh Huynh
  • Patent number: 8675794
    Abstract: A method includes receiving reference signals in a mobile communication terminal, which is designed to receive data-carrying signals that are transmitted from a base station using one of multiple predefined Modulation and Coding Schemes (MCSs). One or more pre-calculated mappings between Signal-to-Noise Ratio (SNR) and error rate for one or more of the MCSs are held in the communication terminal. The pre-calculated mappings are adjusted according to one or more transmission parameters of the data-carrying signals. Measures indicative of respective actual spectral efficiencies that are achievable by the MCSs are estimated based on the adjusted mappings using the received reference signals. A preferred MCS is selected based on the estimated measures, and feedback that is indicative of the preferred MCS is sent to the base station.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: March 18, 2014
    Assignee: Marvell International Ltd.
    Inventors: Yona Perets, Daniel Yellin, Ezer Melzer
  • Patent number: 8654909
    Abstract: According to an embodiment, a semiconductor integrated circuit includes an amplifier, an interference wave suppression unit, a coupler and a filter control circuit. The interference wave suppression unit includes a filter being controlled to be on or off. The filter is configured to suppress an interference wave component of an amplified signal to output the signal as an output signal when the filter is on. The coupler is configured to detect an input signal or the output signal. The filter control circuit controls the filter to be on when a signal level of a detection input signal or a detection output signal detected by the coupler is greater than or equal to a reference value, and controls the filter to be off when the signal level is smaller than the reference value, at arbitrary determination timing in a period of time between a transmission and a reception.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: February 18, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mitsuyuki Ashida, Hideaki Majima
  • Publication number: 20140010324
    Abstract: Pilot logic may determine based upon channel and phase information how to process pilot tones that shift locations every N symbols in an orthogonal frequency division multiplexing (OFDM) packet transmission. Pilot logic may determine a signal-to-noise ratio (SNR) for the channel to determine how to process the shifting pilot tones. Pilot logic may also determine channel and phase information updates such as channel state information and phase correction information from pilot tones. In situations of high SNR, logic may use channel estimates and phase rotations that are obtained from locations of the pilot tones for phase tracking and updating the equalizer. In situations of low SNR, logic may use the phase rotations for phase tracking and not update the equalizer during the OFDM transmission. Logic may also determine the presence or absence of a Doppler effect on the transmission and transmit a selection for N to an access point in response.
    Type: Application
    Filed: December 29, 2012
    Publication date: January 9, 2014
    Inventors: Thomas J. Kenney, Eldad Perahia, Shahrnaz Azizi
  • Publication number: 20140010325
    Abstract: Degree of hierarchical modulation can be varied as a function of satellite position, where such hierarchical modulation can be a combination of phase and amplitude shifts. As each satellite in a multiple satellite system moves towards a D-node or an A-node position, the offset angle of a phase-based hierarchical modulation scheme can be varied. Starting with the lowest satellite position in the sky an offset angle for overlay bits can progressively increase as the position of the satellite in the sky increases. At a satellite's highest point in the sky, the overlay offset angle can be at its maximum. The value of a varying overlay offset angle (for each satellite) can be embedded in an Overlay Identification Marker (OIM) in the broadcast. The receiver can then appropriately correct MRC weightings (weighting more heavily the (higher lying) satellite).
    Type: Application
    Filed: May 31, 2013
    Publication date: January 9, 2014
    Inventor: Carl Scarpa
  • Patent number: 8625703
    Abstract: A method of transmitting control information in a wireless communication system is provided. The method includes configuring downlink control information including a plurality of information fields according to a format of scheduling for transmission of a single codeword in a spatial multiplexing mode, wherein the plurality of information fields include a precoding matrix indicator (PMI) confirmation filed for indicating whether precoding is performed on downlink data by using a PMI reported by a user equipment and a transmitted precoding matrix indicator (TPMI) information field for indicating a codebook index, and at least one of the PMI confirmation field and the TPMI information field indicates an offset value of power for the downlink data transmission or interference information for the downlink data transmission, and transmitting the downlink control information.
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: January 7, 2014
    Assignee: LG Electronics Inc.
    Inventors: Hyun Soo Ko, Jaho Koo, Jae Hoon Chung, Moon Il Lee
  • Patent number: 8619906
    Abstract: A method and system for pre-distorting a dual band signal to compensate for distortion of a non-linear power amplifier in a radio transmitter are disclosed. In one embodiment, the first signal of the dual band signal is tuned to a first intermediate frequency to produce a first tuned signal and the second signal of the dual band signal is tuned to minus the intermediate frequency to produce a second tuned signal. A single input pre-distorter pre-distorts the sum of the first tuned signal and the second tuned signal. The coefficients of the pre-distorter are obtained from a one-dimensional look-up table.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: December 31, 2013
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Chunlong Bai
  • Patent number: 8619896
    Abstract: A method, an apparatus and a system for transmitting information bits are provided. The method for transmitting information bits includes: dividing the information bits to be transmitted into at least two groups; encoding the information bits to be transmitted in each group; modulating the coded bits obtained by the encoding to obtain modulation symbols, in which each modulation symbol is obtained by the modulation of the coded bits in the same group; and mapping and transmitting the modulation symbols. In this way, the receiving end easily reduces the algorithm complexity, thereby ensuring the performance of the receiving end.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: December 31, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Xiaofeng Chen, Yongxia Lv, Yan Cheng