Antinoise Or Distortion Patents (Class 375/284)
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Patent number: 11637573Abstract: 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: GrantFiled: October 10, 2022Date of Patent: April 25, 2023Assignee: NOKIA SOLUTIONS AND NETWORKS OYInventors: Gunter Wolff, Radoslaw Ceszkiel, Grzegorz Haza, Björn Jelonnek, Michael Weber
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Information sending method, information receiving method, sending apparatus, and receiving apparatus
Patent number: 11444665Abstract: 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: GrantFiled: July 15, 2020Date of Patent: September 13, 2022Assignee: Huawei Technologies Co., Ltd.Inventor: Liyan Su -
Patent number: 11394597Abstract: 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: GrantFiled: January 29, 2021Date of Patent: July 19, 2022Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Seyed Mohammad Hossein Mohammadnezhad, Huan Wang, Payam Heydari
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Patent number: 11223386Abstract: 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: GrantFiled: May 19, 2020Date of Patent: January 11, 2022Assignee: STMicroelectronics SAInventors: Mohammed Tmimi, Philippe Galy
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Patent number: 11089555Abstract: 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: GrantFiled: December 23, 2019Date of Patent: August 10, 2021Assignee: QUALCOMM IncorporatedInventors: Huilin Xu, Peter Pui Lok Ang, Wanshi Chen, Joseph Binamira Soriaga, Linhai He
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Patent number: 10938618Abstract: 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: GrantFiled: November 13, 2019Date of Patent: March 2, 2021Assignee: REALTEK SEMICONDUCTOR CORPORATIONInventor: Wen-Shan Wang
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Patent number: 10939497Abstract: 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: GrantFiled: August 10, 2018Date of Patent: March 2, 2021Assignee: Ubiquiti Inc.Inventors: Robert J Pera, Lance D. Lascari
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Patent number: 10686490Abstract: 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: GrantFiled: September 26, 2018Date of Patent: June 16, 2020Assignee: QUALCOMM IncorporatedInventors: Seyong Park, Pinar Sen, Naga Bhushan, Tingfang Ji
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Patent number: 10623032Abstract: 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: GrantFiled: July 11, 2017Date of Patent: April 14, 2020Assignee: SONY SEMICONDUCTOR SOLUTIONS CORPORATIONInventors: Hiroaki Hayashi, Masatsugu Sugano
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Patent number: 10080254Abstract: 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: GrantFiled: December 14, 2015Date of Patent: September 18, 2018Assignee: Ubiquiti Networks, Inc.Inventors: Robert J. Pera, Lance D. Lascari
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Patent number: 10050817Abstract: 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: GrantFiled: November 26, 2016Date of Patent: August 14, 2018Inventor: John David Terry
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Patent number: 9042479Abstract: 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: GrantFiled: October 15, 2009Date of Patent: May 26, 2015Assignee: QUALCOMM IncorporatedInventor: Alecsander Eitan
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Patent number: 9036730Abstract: 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: GrantFiled: January 9, 2012Date of Patent: May 19, 2015Assignee: IKANOS COMMUNICATIONS, INC.Inventors: Sylvain Flamant, Qasem Aldrubi, Echere Iroaga, Jason Hu
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Patent number: 9020026Abstract: 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: GrantFiled: January 6, 2011Date of Patent: April 28, 2015Assignee: LGS Innovations LLCInventor: Robert L. Cupo
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Patent number: 9020052Abstract: 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: GrantFiled: March 15, 2010Date of Patent: April 28, 2015Assignee: Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijke Onderzoek TNOInventor: Haibin Zhang
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Patent number: 9008167Abstract: 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: GrantFiled: December 29, 2012Date of Patent: April 14, 2015Assignee: Intel CorporationInventors: Shahrnaz Azizi, Eldad Perahia, Thomas J. Kenney
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Patent number: 9001947Abstract: 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: GrantFiled: January 10, 2012Date of Patent: April 7, 2015Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventor: Mark Wyville
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Patent number: 9001913Abstract: 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: GrantFiled: September 5, 2013Date of Patent: April 7, 2015Assignee: Futurewei Technologies, Inc.Inventors: Ruxiang Wang, Guozhu Long, Yan Zhang, Amir H. Fazlollahi
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Patent number: 9001918Abstract: 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: GrantFiled: August 24, 2012Date of Patent: April 7, 2015Assignee: Samsung Electronics Co., Ltd.Inventors: Rakesh Taori, Shuangfeng Han
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Patent number: 8995594Abstract: 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: GrantFiled: August 22, 2012Date of Patent: March 31, 2015Assignee: Intel CorporationInventors: Dawson W. Kesling, Andrew W. Martwick
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Patent number: 8995568Abstract: 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: GrantFiled: August 25, 2009Date of Patent: March 31, 2015Assignee: Marvell International Ltd.Inventors: Songping Wu, Quan Zhou, Manyuan Shen, Hongyuan Zhang, Hui-Ling Lou
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Patent number: 8989288Abstract: 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: GrantFiled: December 18, 2012Date of Patent: March 24, 2015Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Jinhua Liu, Bo Goransson, Xinyu Gu, Qingyu Miao, Zhang Zhang
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Patent number: 8989323Abstract: 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: GrantFiled: September 21, 2012Date of Patent: March 24, 2015Assignee: ZTE (USA) Inc.Inventors: Dong Hong Yom, Ying Shen
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Patent number: 8971828Abstract: 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: GrantFiled: February 17, 2012Date of Patent: March 3, 2015Assignee: Fujitsu LimitedInventors: Jianmin Zhou, Pei Chen, Hui Li, Zhan Shi
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Patent number: 8964875Abstract: 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: GrantFiled: June 10, 2013Date of Patent: February 24, 2015Assignee: MStar Semiconductor, Inc.Inventor: Khurram Muhammad
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Patent number: 8958508Abstract: 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: GrantFiled: June 9, 2010Date of Patent: February 17, 2015Assignee: ZTE CorporationInventors: Xiaoming Su, Yujie Li
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Patent number: 8948293Abstract: 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: GrantFiled: April 20, 2012Date of Patent: February 3, 2015Assignee: Texas Instruments IncorporatedInventors: Eko Onggosanusi, Vikram Chandrasekhar, Runhua Chen
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Patent number: 8923434Abstract: 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: GrantFiled: February 11, 2013Date of Patent: December 30, 2014Assignee: Intel Mobile Communications GmbHInventors: Andreas Menkhoff, Staffan Sahlin
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Patent number: 8897385Abstract: 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: GrantFiled: October 12, 2010Date of Patent: November 25, 2014Assignee: MaxLinear, Inc.Inventor: Sridhar Ramesh
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Patent number: 8891662Abstract: 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: GrantFiled: June 14, 2010Date of Patent: November 18, 2014Assignee: Electronics and Telecommunications Research InstituteInventors: Byung Jang Jeong, Bangwon Seo, Jae Young Ahn
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Patent number: 8867659Abstract: 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: GrantFiled: June 28, 2010Date of Patent: October 21, 2014Assignee: Rohde & Schwarz GmbH & Co. KGInventor: Detlev Liebl
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Patent number: 8861662Abstract: 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: GrantFiled: February 13, 2014Date of Patent: October 14, 2014Assignee: Marvell International Ltd.Inventors: Yona Perets, Daniel Yellin, Ezer Melzer
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Patent number: 8842766Abstract: 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: GrantFiled: March 31, 2010Date of Patent: September 23, 2014Assignee: Texas Instruments IncorporatedInventors: Indu Prathapan, Anjana Ghosh, Diganta Baishya, Sundarrajan Rangachari, Sankar Prasad Debnath, Ranjit Kumar Dash, Srinath Mathur Ramaswamy
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Patent number: 8837625Abstract: 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: GrantFiled: December 6, 2013Date of Patent: September 16, 2014Assignee: LG Electronics Inc.Inventors: Hyun Soo Ko, Jaho Koo, Jae Hoon Chung, Moon Il Lee
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Patent number: 8831129Abstract: 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: GrantFiled: May 10, 2011Date of Patent: September 9, 2014Assignee: Huawei Technologies Co., Ltd.Inventors: Xiaofeng Chen, Yongxia Lv, Yan Cheng
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Patent number: 8817907Abstract: 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: GrantFiled: March 26, 2009Date of Patent: August 26, 2014Assignee: Ikanos Communications, Inc.Inventors: Massimo Sorbara, Patrick Duvaut, Amitkumar Mahadevan, Laurent Francis Alloin
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Patent number: 8787491Abstract: 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: GrantFiled: October 2, 2012Date of Patent: July 22, 2014Assignee: Huawei Technologies Co., Ltd.Inventors: Mingyu Zhou, Yuan Xia, Qiang Li, Zuomin Wu
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Patent number: 8767865Abstract: 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: GrantFiled: September 21, 2011Date of Patent: July 1, 2014Assignee: NEC CorporationInventor: Kazushi Muraoka
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Patent number: 8744023Abstract: 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: GrantFiled: November 28, 2007Date of Patent: June 3, 2014Assignee: Marvell International Ltd.Inventors: Leilei Song, Rohit U. Nabar, Kedar Shirali
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Patent number: 8724731Abstract: 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: GrantFiled: January 26, 2011Date of Patent: May 13, 2014Assignee: Intersil Americas Inc.Inventors: Wilhelm Steffen Hahn, Wei Chen
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Patent number: 8718164Abstract: 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: GrantFiled: April 29, 2013Date of Patent: May 6, 2014Assignee: QUALCOMM IncorporatedInventors: Petru Cristian Budianu, Dhananjay Ashok Gore, Alexei Yurievitch Gorokhov
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Publication number: 20140093008Abstract: 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: ApplicationFiled: October 3, 2013Publication date: April 3, 2014Applicant: Hughes Network SystemsInventors: James Jehong JONG, Harish RAMCHANDRAN, Jun WANG, Channasandra RAVISHANKAR
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Patent number: 8687684Abstract: 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: GrantFiled: December 18, 2012Date of Patent: April 1, 2014Inventor: Phuong Thu-Minh Huynh
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Patent number: 8675794Abstract: 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: GrantFiled: October 12, 2010Date of Patent: March 18, 2014Assignee: Marvell International Ltd.Inventors: Yona Perets, Daniel Yellin, Ezer Melzer
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Patent number: 8654909Abstract: 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: GrantFiled: September 20, 2011Date of Patent: February 18, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Mitsuyuki Ashida, Hideaki Majima
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Publication number: 20140010324Abstract: 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: ApplicationFiled: December 29, 2012Publication date: January 9, 2014Inventors: Thomas J. Kenney, Eldad Perahia, Shahrnaz Azizi
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Publication number: 20140010325Abstract: 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: ApplicationFiled: May 31, 2013Publication date: January 9, 2014Inventor: Carl Scarpa
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Patent number: 8625703Abstract: 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: GrantFiled: August 26, 2009Date of Patent: January 7, 2014Assignee: LG Electronics Inc.Inventors: Hyun Soo Ko, Jaho Koo, Jae Hoon Chung, Moon Il Lee
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Patent number: 8619906Abstract: 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: GrantFiled: July 5, 2012Date of Patent: December 31, 2013Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventor: Chunlong Bai
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Patent number: 8619896Abstract: 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: GrantFiled: December 9, 2011Date of Patent: December 31, 2013Assignee: Huawei Technologies Co., Ltd.Inventors: Xiaofeng Chen, Yongxia Lv, Yan Cheng