Plural Modulation Patents (Class 455/102)
  • Patent number: 10243539
    Abstract: A transmit filter for a communications device includes a surface acoustic wave (SAW) band-pass filter configured to pass a transmit frequency band and a tunable transmitter impedance matching network in series. The tunable transmitter impedance matching network matches an input impedance of the SAW band-pass filter to the output impedance of a power amplifier over a portion of the transmit frequency band in response to a tuning input.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: March 26, 2019
    Assignee: Resonant Inc.
    Inventors: James R. Costa, Neal Fenzi, Robert Hammond
  • Patent number: 10225379
    Abstract: The present disclosure relates to a transmission apparatus, a transmission method, a reception apparatus, and a reception method which make it possible to control redundancy of a header in packet communication. A region representing a packet length in a header of a packet is set according to a size of a payload of an input packet. A header of a baseband packet includes a minimum fixed length header including type identification information for identification of a type of the input packet or the stream and information of a packet length of the input packet or the stream stored in a payload of the baseband flame packet.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: March 5, 2019
    Assignee: SATURN LICENSING LLC
    Inventor: Lachlan Michael
  • Patent number: 10135486
    Abstract: A high-frequency front-end circuit includes first and second switching circuits, first, second, and third splitters, and first and second lines. The first line is connected to the second splitter. The second line is connected to the third splitter. An adjustment circuit is connected between the first and second lines. The frequency of a harmonic signal of a transmission signal transmitted through the first line has a frequency band that is close to or overlaps the frequency of a reception signal transmitted through the second line. The impedance of the adjustment circuit is set such that a harmonic signal transmitted from the adjustment circuit to the second line and a harmonic signal transmitted from the third splitter to the second line are not in same phase with each other at the connection point between the adjustment circuit and the second line.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: November 20, 2018
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventor: Takanori Uejima
  • Patent number: 10116383
    Abstract: An outphasing amplifier having: a first branch arranged to receive and process a first branch signal, the first branch signal being phase modulated, with constant amplitude envelope; and a second branch arranged to receive and process a second branch signal, the second branch signal being phase modulated, with constant amplitude envelope, and at least a portion of the second branch signal anti-phase from the first branch signal, wherein each branch includes: circuitry arranged to process the signal to reduce the energy in sidebands of the signal away from the central frequency, while retaining the phase information in the signal; and an amplifier arranged to amplify the filtered and re-asserted branch signal.
    Type: Grant
    Filed: February 8, 2017
    Date of Patent: October 30, 2018
    Assignee: NXP B.V.
    Inventors: Robin Wesson, Mustafa Acar
  • Patent number: 10111134
    Abstract: Frames in a variable length frame format which are addressed to a plurality of users are multiplexed and preferably transmitted. Data frames having different lengths are multiplexed on a same time through space division multiple access, but since the multiplexed frames are transmitted while eventually having a same length, when the multiplexed data frames from the access point STA0 are received in the respective communication stations STA1 to STA3 in FIG. 4 or when data simultaneously transmitted from the respective communication stations STA1 to STA3 are received in the access point STA0 in FIG. 5, it is possible to eliminate an operation instability of AGC.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: October 23, 2018
    Assignee: SONY CORPORATION
    Inventors: Ryota Kimura, Hiroaki Takano, Yuichi Morioka
  • Patent number: 9883470
    Abstract: A communication device is provided that includes a first transmission circuit configured to transmit radio signals with a first transmission power range up to a first predefined transmission power. The communication device further includes a second transmission circuit configured to transmit the radio signals with a second transmission power range up to a second predefined transmission power. The communication device further includes a baseband circuit configured to select a transmission circuit from the first transmission circuit and the second transmission circuit and to generate a signal based on the predefined transmission power of the selected transmission circuit. The baseband circuit is configured to apply the signal to the selected transmission circuit to be transmitted by the selected transmission circuit.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: January 30, 2018
    Assignee: INTEL IP CORPORATION
    Inventors: Alejandro Roji, Jose Cesares Cano, Mathias Kurth, Thomas Fliess
  • Patent number: 9774348
    Abstract: A method for multi-dimensional modulation of a network protocol including control data and payload data. The method includes encoding a first sine wave with the control data; encoding a second sine wave with the payload data; and summing the first and second sine waves to generate a compound sine wave. In some embodiments, the control data is header information for a first Ethernet packet and post-payload data for a second Ethernet packet; and the payload data is payload data for the second Ethernet packet.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: September 26, 2017
    Assignee: QUANTUMSINE ACQUISITIONS INC.
    Inventor: Arthur E. Lee
  • Patent number: 9722543
    Abstract: There is described a method of generating a power supply tracking a reference signal, comprising the steps of: filtering the reference signal; generating a first voltage in dependence on the filtered reference signal; generating a second voltage in dependence on the reference signal; and combining the first and second voltages to provide a power supply voltage.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: August 1, 2017
    Assignee: SnapTrack, Inc.
    Inventors: Martin Paul Wilson, Gerard Wimpenny
  • Patent number: 9600948
    Abstract: A keyless entry apparatus includes: a vehicle-side device provided in a vehicle, the device including a vehicle-side transmitter that transmits a request signal and a vehicle-side receiver that receives an answer signal; and a mobile device including a mobile device receiver that receives the request signal and a mobile device transmitter that transmits the answer signal in accordance with the request signal. The vehicle-side device includes at least one modulator that modulates the request signal, the mobile device includes at least one demodulator that demodulates the request signal in accordance with the corresponding at least one modulator, and the request signal includes a signal modulated by the at least one modulator. Switching between modulation methods for the request signal is performed at at least one timing.
    Type: Grant
    Filed: January 15, 2016
    Date of Patent: March 21, 2017
    Assignee: ALPS ELECTRIC CO., LTD.
    Inventor: Akira Miyazawa
  • Patent number: 9509546
    Abstract: A modulation processor (500) comprises a first processing stage (110) and a second processing stage (120). The first processing stage (110) comprises a phase generation stage (117) arranged to generate a phase signal (PM) indicative of a phase of a modulation signal (S), a differentiation stage (118) arranged to generate a frequency signal (FM) by differentiating the phase signal (PM), and a first bandwidth reduction stage (113) arranged to generate a first output signal (FM_LP) by reducing a bandwidth of the frequency signal (FM). The second processing stage (120) is arranged to generate a second output signal (AM*) proportional to the modulation signal (S) with its phase retarded by an angle equal to an integral of the first output signal (FM_LP).
    Type: Grant
    Filed: April 30, 2014
    Date of Patent: November 29, 2016
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Magnus Nilsson, Sami Vilhonen
  • Patent number: 9451625
    Abstract: According to certain embodiments, methods and systems include providing interference characterization data by a network node to a first wireless device for use in performing interference mitigation. A network node may provide telecommunications services for a first wireless device located associated with the network node. Characteristic data associated with at least one characteristic of an interfering signal associated with a second wireless device may be identified. The at least one characteristic may identify at least one transmission mode associated with the interfering signal. The characteristic data associated with the interfering signal associated with the second wireless device may be transmitted to the first wireless device.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: September 20, 2016
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: George Jöngren, Bo Lincoln, Stefania Sesia
  • Patent number: 9325288
    Abstract: In a wireless communication device, baseband variable gain amplifiers amplify a baseband signal. Mixers convert the amplified baseband signal into a high-frequency transmission signal. Hybrid variable gain amplifiers amplify an in-phase local signal and an orthogonal local signal which are input to the mixers. The level detection controller changes respective gains of the baseband variable gain amplifiers and the hybrid variable gain amplifiers, in response to power of the high-frequency transmission signal.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: April 26, 2016
    Assignee: Panasonic Corporation
    Inventor: Takayuki Tsukizawa
  • Patent number: 9319802
    Abstract: A suppressed carrier audio system can include a modulator having an input configured to receive an audio signal having audio content and configured to modulate the received audio signal onto an ultrasonic carrier to produce a modulated signal; a bandpass filter to receive the modulated signal and suppress or remove the carrier from the modulated signal, and further configured to pass a sideband of the modulated signal thereby creating a suppressed carrier signal; and a first ultrasonic transducer having an input coupled to receive the suppressed carrier signal, the ultrasonic transducer configured to emit the suppressed carrier signal in a direction toward an intended listener. The system can also include a demodulator having a signal generator configured to generate a carrier signal and a second ultrasonic transducer having an input coupled to receive the carrier signal and to emit the carrier signal in a direction toward the intended listener.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: April 19, 2016
    Assignee: Turtle Beach Corporation
    Inventor: Elwood Grant Norris
  • Patent number: 9300265
    Abstract: A wireless communication device that includes a power amplifier and an antenna is provided. The power amplifier includes a first and a second power amplifying paths, a first and a second selection circuits, first matching circuits and second matching circuits. The first and the second power amplifying paths receive a first and a second input signals respectively. The first selection circuit selects one of the first matching circuits according to a frequency band of the first input signal to perform a first matching process to generate a first output signal. The second selection circuit selects one of the second matching circuits according to a frequency band of the second input signal to perform a second matching process to generate a second output signal. The antenna is coupled to the power amplifier to transmit the first and/or the second output signals.
    Type: Grant
    Filed: December 7, 2014
    Date of Patent: March 29, 2016
    Assignee: HTC Corporation
    Inventors: Chien-Hua Lee, Yen-Chuan Lin
  • Patent number: 9294043
    Abstract: Apparatus and methods for envelope tracking calibration are provided. In one embodiment, a power amplifier system includes a power amplifier, an envelope tracker that generates the power amplifier's supply voltage, a power detector, and a calibration module. The envelope tracker includes an envelope shaping table generated at a desired gain compression and a scaling module that scales an amplitude of an envelope signal. The power detector measures the power amplifier's output power, and the calibration module provides calibration data to the scaling module to change the scaling of the envelope signal's amplitude. The calibration module sets the calibration data to a first value corresponding to a supply voltage level associated with substantially no gain compression, and reduces the supply voltage level by changing the calibration data until the power detector indicates that the gain compression of the power amplifier is about equal to the desired gain compression.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: March 22, 2016
    Assignees: SKYWORKS SOLUTIONS, INC., SNAPTRACK, INC.
    Inventors: David Steven Ripley, Sabah Khesbak, Benjamin Bartram, Kevin Lee Cobley, Robert Astle Henshaw, Julian Hildersley, Robert John Thompson
  • Patent number: 9246750
    Abstract: A wireless communication apparatus of the present invention that uses an adaptive modulation radio scheme, includes: two-system transmission paths of an active system transmission path and an auxiliary system transmission path; a line information acquiring unit that acquires line information indicating line states of the active system transmission path and the auxiliary system transmission path; and a signal processing unit that determines whether or not a fault occurs in the active system transmission path and the auxiliary system transmission path, based on the line information acquired by the line information acquiring unit. The signal processing unit performs a setting so as to perform wireless communication using the two-system transmission paths of the active system transmission path and the auxiliary system transmission path, in a case of determining that a fault does not occur in the active system transmission path and the auxiliary system transmission path.
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: January 26, 2016
    Assignee: NEC CORPORATION
    Inventor: Hideki Ogata
  • Patent number: 9232477
    Abstract: A terminal apparatus that performs radio communication with a base station apparatus in a mobile communication system, including: a transmission mode information receiving unit configured to receive transmission mode information, from the base station apparatus, corresponding to a transmission mode that should be set in the terminal apparatus; a transmission mode setting unit configured to set the terminal apparatus to the transmission mode if the terminal apparatus can perform radio transmission in the transmission mode corresponding to the transmission mode information received by the transmission mode receiving unit; and a radio transmission unit configured to perform radio transmission in the transmission mode.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: January 5, 2016
    Assignee: NTT DOCOMO, INC.
    Inventors: Yuta Sagae, Hiroyuki Ishii, Hiromasa Umeda
  • Patent number: 9209944
    Abstract: A method and apparatus for transmitting enhanced uplink (EU) data is disclosed. Configuration parameters for EU operation are received, including a priority associated with each MAC-d flow and a maximum number of H-ARQ transmissions associated with each MAC-d flow. A H-ARQ process to use for transmission for a next TTI is identified. On a condition that the identified H-ARQ process is available for new data for the next TTI, data is selected for transmission over the EU channel based on MAC-d flow priority, a transmission status is set to indicate a new transmission, and the selected data is transmitted in accordance with the identified H-ARQ process. On a condition that the identified H-ARQ process is not available for new data for the next TTI, the transmission status is set to indicate a retransmission, and data associated with the identified H-ARQ process is retransmitted.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: December 8, 2015
    Assignee: InterDigital Technology Corporation
    Inventors: Stephen E. Terry, Guodong Zhang
  • Patent number: 9173219
    Abstract: A method, an apparatus and a system can be used for improving data transmission performance. Specific steps may include determining whether a transmission rate for transmitting data is lower than a reference transmission rate that the data is actually required. If it is lower than the reference transmission rate, a reference working frequency is obtained by querying part of or an entire working frequency band. The reference working frequency corresponds to a transmission rate that is higher than or equal to the reference transmission rate from the working frequency band. Frequency modification indication information is sent to a network access device and a working frequency for communication is modified to the reference working frequency.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: October 27, 2015
    Assignee: Huawei Device Co., LTD.
    Inventor: Wenfeng Yao
  • Patent number: 9065715
    Abstract: A method for operating a radio communication system involves the use of OFDM and involves a first sending station modulating a first OFDM symbol onto a first carrier frequency and sending the first OFDM symbol to a first receiving station via a first transmission channel using an air interface. The first sending station changes the first carrier frequency during a time used for sending the first OFDM symbol, the change in the first carrier frequency being made independently of a change in transmission characteristics of the first transmission channel over time. A fast frequency hopping system is disclosed.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: June 23, 2015
    Assignees: Nokia Solutions and Networks GmbH & Co. KG, Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forschung E. V.
    Inventors: Volker Jungnickel, Egon Schulz, Wolfgang Zirwas
  • Patent number: 9048914
    Abstract: Provided is a downlink reference signal structure suitable for increase in number of transmission layers. A radio base station device (20) has a plurality of transmission antennas; a orthogonal RS sequence generator (22) for generating orthogonal reference signals based on a two-dimensional orthogonal code, the orthogonal reference signals being orthogonalized between downlink reference signals adjacent in two-dimensional directions of frequency direction and time direction to each other in one transmission layer and being orthogonalized in different transmission layers assigned to one radio resource; a multiplexer (23) for multiplexing transmission data and the orthogonal reference signals in the one transmission layer; and a transmitter for transmitting a transmission signal obtained by multiplexing the transmission data and the orthogonal reference signals, via the transmission antenna in transmission layers simultaneously.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: June 2, 2015
    Assignee: NTT DOCOMO, INC.
    Inventors: Yoshihisa Kishiyama, Kazuaki Takeda, Motohiro Tanno, Hidekazu Taoka
  • Patent number: 9042853
    Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.
    Type: Grant
    Filed: January 14, 2014
    Date of Patent: May 26, 2015
    Assignee: Aviat U.S., Inc.
    Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
  • Patent number: 9036559
    Abstract: A mobile station device that includes a receiving unit. The receiving unit of mobile station device receives using at least a first downlink component carrier and a second downlink component carrier which are aggregated, the receiving unit is configured to receive, a first physical downlink control channel for the mobile station device, on the first downlink component carrier, and a second physical downlink control channel for the mobile station device, on the second downlink component carrier, where both a first sequence including at least modulated symbols of the first physical downlink control channel and a second sequence including at least modulated symbols of the second physical downlink control channel are cyclically-shifted by a base station.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: May 19, 2015
    Assignee: SHARP KABUSHIKI KAISHA
    Inventor: Shoichi Suzuki
  • Patent number: 9026046
    Abstract: A near field communications (NFC) device is disclosed that load modulates and regulates a radio frequency (RF) signal. The NFC device includes a rectifier that rectifies the RF signal to provide a direct current voltage. The NFC device also includes a modulator that modulates a data signal. The modulator provides a first voltage when the data signal is at a first level and provides a second voltage when the data signal is at a second level. The NFC device utilizes a regulator to regulate and to load modulate the RF signal. The regulator adjusts an impedance based upon a comparison of the DC voltage provided by the regulator to the first voltage provided by the modulator for the data signal at the first level or to the second voltage provided by the modulator for the data signal at the second level.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: May 5, 2015
    Assignee: Broadcom Corporation
    Inventor: Alastair Lefley
  • Publication number: 20150118979
    Abstract: To control a gain of a transmit signal in a wireless transmitter, the wireless transmitter is provided. The wireless transmitter includes a baseband processor for processing an analog baseband transmit signal, and a Radio Frequency (RF) signal processor including a plurality of mixers. The plurality of mixers are configured to share an output signal of the baseband processor as an input.
    Type: Application
    Filed: July 11, 2014
    Publication date: April 30, 2015
    Inventors: Hong-Tak LEE, Dae-Hyun KWON, Sang-Hyun BAEK, Xi YAO, Jong-Soo LEE, Young-Taek LEE
  • Patent number: 9020453
    Abstract: A radio frequency (RF) power amplifier system or transmitter includes one or more power amplifiers and a controller that is configured to adjust amplitudes and phases of RF input signals of the one or more power amplifiers and supply voltages applied to the one or more power amplifiers. In embodiments where multiple power amplifiers are used, a combiner may be provided to combine outputs of the power amplifiers.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: April 28, 2015
    Assignee: ETA Devices, Inc.
    Inventors: Mark A. Briffa, Joel L. Dawson, John E. DeRoo, Krenar Komoni, David J. Perreault, Oguzhan Uyar
  • Patent number: 9014307
    Abstract: A multichannel radio receiver may include a radio frequency (RF) subsystem and a digital subsystem. The RF subsystem may be configured to provide analog information associated with a radio band to an analog to digital converter (ADC). The ADC samples the analog input and sends digital output to the digital subsystem. The digital subsystem may be configured with one or more channelizers and one or more decoders. A channelizer within the digital subsystem may filter and re-sample the digital output to result in a channel plan having a desired bandwidth and a desired sample rate. The sample rate may be selected for compatibility with a decoder. The decoder may have design specifications based in part on a modulation scheme to be decoded. The design specifications may indicate the desired sample rate to be provided by the channelizer.
    Type: Grant
    Filed: February 25, 2013
    Date of Patent: April 21, 2015
    Assignee: Itron, Inc.
    Inventor: Danny Ray Seely
  • Patent number: 9008036
    Abstract: The present invention employs a pilot scheme for frequency division multiple access (FDM) communication systems, such as single carrier FDM communication systems. A given transmit time interval will include numerous traffic symbols and two or more short pilot symbols, which are spaced apart from one another by at least one traffic symbol and will have a Fourier transform length that is less than the Fourier transform length of any given traffic symbol. Multiple transmitters will generate pilot information and modulate the pilot information onto sub-carriers of the short pilot symbols in an orthogonal manner. Each transmitter may use different sub-carriers within the time and frequency domain, which is encompassed by the short pilot symbols within the transmit time interval. Alternatively, each transmitter may uniquely encode the pilot information using a unique code division multiplexed code and modulate the encoded pilot information onto common sub-carriers of the short pilot symbols.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: April 14, 2015
    Assignee: Apple Inc.
    Inventors: Jianglei Ma, Ming Jia, Hua Xu, Wen Tong, Peiying Zhu, Moussa Abdi
  • Patent number: 9008209
    Abstract: The present invention relates to a method including signalling by a receive node at least one first transmission rank r to a transmit node, where 1?r ?R, wherein R is a maximum available rank for a transmission, and at least one predefined precoding matrix corresponds to the first transmission rank r, determining by the transmit node a second transmission rank r? for transmitting data from the transmit node to the receive node, where 1?r? ?R, defining at least two subsets of precoding matrices for at least one of the at least one first transmission rank r, selecting one of the at least two subsets of precoding matrices in accordance with a channel quality estimate for a radio channel, and signalling the selected one subset of precoding matrices, wherein the selected one subset of precoding matrices is associated with said the at least one predefined precoding matrix.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: April 14, 2015
    Assignee: Huawei Techonlogies Co., Ltd.
    Inventors: Jianghua Liu, Anahid Robert Safavi
  • Patent number: 8995935
    Abstract: Disclosed herein is a wireless communication device, including: a plurality of communication units for transmission adapted to modulate and transmit a transmission subject signal; the communication units for transmission including a communication unit or units for transmission which adopt a method which modulates the amplitude and a communication unit or units for transmission which adopt a modulation method which modulates at least the phase or the frequency and requires transmission power lower than that of the method which modulates the amplitude.
    Type: Grant
    Filed: August 26, 2010
    Date of Patent: March 31, 2015
    Assignee: Sony Corporation
    Inventor: Norihito Mihota
  • Patent number: 8989289
    Abstract: A method and system for transmitting three distinct electromagnetic signals on a same frequency are provided. One or more transmitting devices transmit a first data signal and an inverse of the first data signal in two orthogonal linear polarities of an antenna maintaining their inverted phase relationship and a same amplitude as propagated. Transmitting devices also transmit a second data signal in a linear polarity with a 45 degree rotation around the transmit axis of the first data signal. Transmitting devices also transmit a third data signal in linear polarity orthogonal to the second data signal and consequently 315 degree rotation around the transmit axis from the first data signal.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: March 24, 2015
    Inventor: Nigel Iain Stuart Macrae
  • Patent number: 8983405
    Abstract: Various embodiments provide for systems and methods for wireless communications that implement transmitter protection schemes using spatial combining. The protection scheme implemented by some embodiments provides for a number of benefits, including without limitation: hitless protection; constant power monitoring for each wireless channel being utilized; extra gain to wireless signals transmitted; beam steering, beam hopping, and beam alignment capabilities; and varying levels of transmission path protection (e.g., 1+1 protection, or 1+N protection). Additionally, the features of some embodiments may be applied to a variety of wireless communications systems including, for example, microwave wireless systems, cellular phone systems and WiFi systems.
    Type: Grant
    Filed: September 3, 2013
    Date of Patent: March 17, 2015
    Assignee: Aviat U.S., Inc.
    Inventors: Ying Shen, David Schafer
  • Patent number: 8982998
    Abstract: A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: March 17, 2015
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Yutaka Murakami, Masayuki Orihashi, Akihiko Matsuoka
  • Patent number: 8976836
    Abstract: A sounding reference signal transmission method which is efficient in an uplink wireless telecommunications system using a multiple antenna technique and sounding reference signal hopping. A terminal using the multiple antenna technique is equipped with a plurality of antennas, and a base station receives the sounding reference signal transmitted from these antennas and estimates the uplink channel state of each antenna. Moreover, the sounding reference signal performs frequency hopping so that the base station determines the channel condition for the entire bandwidth to which data is transmitted in the uplink system. The sounding reference signal is transmitted through an antenna pattern in which the sounding reference signal can be transmitted through the entire data transmission bandwidth of the uplink system for each antenna of the terminal without additional overhead in this environment.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: March 10, 2015
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Sang Min Ro, Joon Young Cho, Ju Ho Lee, Yingyang Li, Jin Kyu Han
  • Patent number: 8953702
    Abstract: A process selects a Precoding Matrix Index (PMI) in a Multiple In Multiple Out (MIMO) receiver used in a wireless communications system including a base station communicating with User Equipments (UE) through a downlink and uplink channel. The base station applies a precoding on the transmit symbol vector based on a matrix selected from a set of predefined matrices and identified by a PMI index computed by the UE and forwarded to the base station via the uplink. The process includes estimating the MIMO channel matrix H of a given set of resources blocks comprising received symbol vectors, estimating the variance ?2 of the additive noise (AWGN), and computing for each particular matrix comprised within the set of predefined matrices a cost function representative of the orthogonality of the matrix MIMO channel matrix H.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: February 10, 2015
    Assignee: St-Ericsson SA
    Inventors: Sébastien Aubert, Andrea Ancora
  • Patent number: 8948290
    Abstract: The present invention relates to a method and arrangement for symbol mapping in wireless communication systems utilizing OFDM transmission technology in combination with advanced coding schemes. In the method according to the present invention, adapted for use in a wireless communication system utilizing OFDM transmission technology, an OFDM grid is defined by at least a first dimension and a second dimensions from the dimensions time, frequency or space. The advanced coding scheme, for example Alamouti coding, outputs symbols that are related via the coding. At least some of the symbols, defining a code related symbol group should experience identical, or at least very similar, radio channels. According to one embodiment of the present invention, symbols from the same code related symbol group is placed as close together in the OFDM grid as possible.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: February 3, 2015
    Assignee: Unwired Planet, LLC
    Inventor: Jonas B. Karlsson
  • Patent number: 8934850
    Abstract: The present invention relates to user equipment (UE) having at least two transmit antennas that are capable of transmitting RF signals to a base station, which selects either an open-loop mode or a closed-loop mode depending on how the RF signals from the UE are changing. In the closed-loop mode, the base station periodically evaluates the RF signals from the UE and selects which of the UE's transmit antennas are to be used. This information is then sent to the UE. If the base station determines that the RF signals from the UE are changing too rapidly for effective control, then the base station selects the open-loop mode, such that the UE selects which of the UE's transmit antennas are to be used.
    Type: Grant
    Filed: February 4, 2008
    Date of Patent: January 13, 2015
    Assignee: Microsoft Corporation
    Inventors: Jianming Wu, Jianglei Ma, Wen Tong, Peiying Zhu
  • Patent number: 8929484
    Abstract: A communications transmitter includes a baseband processor configured to generate amplitude, angle, in-phase and quadrature baseband signals and a combination modulator that is configurable to modulate in the polar domain and, alternatively, in the quadrature domain. The combination modulator includes a quadrature modulator and a separate and distinct angle modulator that is configured to serve as a local oscillator for the quadrature modulator. In one embodiment of the invention the combination modulator is configured to modulate in the quadrature domain when the transmitter is operating according to a first communications condition (e.g., first transmit power level or first modulation scheme) and is configured to modulate in the polar domain when the transmitter is operating according to a second communications condition (e.g., second transmit power level or second modulation scheme).
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: January 6, 2015
    Inventor: Earl W. McCune, Jr.
  • Patent number: 8929475
    Abstract: Methods and apparatuses are provided for uplink MIMO transmissions in a wireless communication system. In some particular aspects, an E-TFC selection process for selecting a transport format combination for an uplink MIMO transmission may take certain steps in the case that a UE is power- or buffer-limited. For example, in a rank 2 transmission, non-scheduled data is allocated only to the primary stream. If the allocated non-scheduled data is less than the determined primary stream transport block size, scheduled data is allocated to the primary stream in an amount not to exceed the determined primary stream TBS. Finally, scheduled data is allocated to the secondary stream in an amount not to exceed the determined secondary stream TBS.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: January 6, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Sony J. Akkarakaran, Arjun Bharadwaj, Sharad Deepak Sambhwani, Ravi Agarwal
  • Patent number: 8929194
    Abstract: A method for generating/transmitting a transmission-unit symbol sequence is disclosed. In the case of transmission information, the information is modulated in time and frequency domains on the basis of a predetermined transmission unit (e.g., a transmission time interval TTI or slot), simultaneous transmission of the information is made, and then a transmission unit symbol is generated/transmitted. A transmission sequence is masked in each symbol contained in one transmission unit. Symbol-unit circular shift (cyclic shift) is applied to the masked result, so that transmission efficiency increases. A control signal transmission method for supporting a variety of formats and a signal transmission method based on a prime-length sequence are also provided.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: January 6, 2015
    Assignee: LG Electronics Inc.
    Inventors: Seung Hee Han, Min Seok Noh, Yeong Hyeon Kwon, Hyun Woo Lee, Dong Cheol Kim, Jin Sam Kwak
  • 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: 8923364
    Abstract: In general, the subject matter described in this disclosure can be embodied in methods, systems, and program products for transmitting data over discontiguous portions of radio frequency spectrum. Data that is to be wirelessly transmitted to a remote computing device is received. A first signal that encodes the data across a band of radio frequencies is generated. The first signal is split into multiple signals, each of the multiple signals being associated with a different portion of the band of radio frequencies. Each of the multiple signals is filtered to isolate each respective one of the multiple signals to its associated portion of the band of radio frequencies. At least one of the multiple signals is frequency translated. Each of the multiple signals are combined after the filtering of each of the multiple signals. The second signal is provided for wireless transmission by an antenna.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: December 30, 2014
    Assignee: Google Inc.
    Inventor: C. Philip Gossett
  • Patent number: 8918071
    Abstract: A system and method to be used with first and second devices where the first and second devices are capable of communicating using a subset of different modulation schemes wherein the subset includes at least first and second different modulation schemes, the method for optimizing transmission of data from the first device to the second device, the method comprising the acts of at the first device, when data is to be transmitted from the first device to the second device, receiving at least a portion of a trigger signal from the second device wherein the transmitted trigger signal includes data transmitted using a sequence of at least two of the modulation schemes from the subset, the portion of the trigger signal received being a received trigger signal, analyzing the received trigger signal to identify one of the modulation schemes from the subset as a function of the received trigger signal as an initial modulation scheme to be used to transmit data to the second device and transmitting the data from the f
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: December 23, 2014
    Assignee: Blackberry Limited
    Inventors: Sean Simmons, Stefan E. Janhunen, David S. Furbeck
  • Patent number: 8908791
    Abstract: The present disclosure relates to channel state feedback in a communication system. The method includes obtaining a reference signal from an access point; deriving a rank indication, a codebook subset selection indication and a precoding matrix index based on the obtained reference signal; sending a first feedback message conveying the rank indication and the codebook subset selection indication, and sending a second feedback message conveying the precoding matrix index, to the access point; and receiving, from the access point, data precoded by a matrix derived based on the rank indication, the codebook subset selection indication and the precoding matrix index.
    Type: Grant
    Filed: January 17, 2014
    Date of Patent: December 9, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: David Mazzarese, Yongxing Zhou
  • Patent number: 8891678
    Abstract: A receiver receives, using a plurality of antennas, a multiplexed signal that includes (i) a first OFDM modulation signal with a subcarrier carrying a symbol including multiplex information and a subcarrier carrying a pilot symbol and a subcarrier carrying a data symbol and (ii) a second OFDM modulation signal with a subcarrier carrying a symbol including multiplex information and a subcarrier carrying the pilot symbol and a subcarrier carrying the data symbol. A decoder uses the symbol including multiplex information and decodes the data symbol.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 18, 2014
    Assignee: Wi-Fi One, LLC
    Inventors: Yutaka Murakami, Masayuki Orihashi, Akihiko Matsuoka
  • Patent number: 8885758
    Abstract: The present invention provides a data stream processing method, device, and system. The data stream processing method includes: using a precoding parameter to perform precoding processing on an lth to-be-sent data stream of a current kth transmitting device, where the lth to-be-sent data stream includes a lattice point data stream mapped to a lattice grid; and sending the precoded lth to-be-sent data stream to a kth receiving device, where both l and k are positive integers. The technical solutions in the embodiments of the present invention can be helpful for filtering out interference, exactly complies with an actual processing procedure of an interfering data stream, and have strong practicability.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: November 11, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Huang Huang, Kin Nang Lau, Yinggang Du
  • Patent number: 8885455
    Abstract: A method for sending data includes obtaining data packets to be sent and modulating, by each transmit diversity branch, the data packets by using modulation mode corresponding to the each transmit diversity branch, and sending the modulated data packets. The modulation modes form a preset optimized combination of modulation modes. A different modulation mode corresponds to a different group of modulation factors and/or different group of constellation modulation symbols. The different groups of modulation factors comply with a preset modulation factor mapping relationship. The different groups of constellation modulation symbols comply with a preset constellation modulation symbol mapping relationship.
    Type: Grant
    Filed: May 27, 2010
    Date of Patent: November 11, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Tao Wu, Yinwei Zhao
  • Patent number: 8872616
    Abstract: A system and method for remote activation of a device includes, in one embodiment, transmitting a command message according to a first modulation, and transmitting a signal representing the command message for the device according to a second modulation. The signal representing the command message transmitted according to the second modulation may be transmitted within the command message transmitted according to the first modulation.
    Type: Grant
    Filed: September 28, 2006
    Date of Patent: October 28, 2014
    Assignee: Lear Corporation
    Inventors: Ronald O. King, Riad Ghabra, John S. Nantz, Tom Q. Tang
  • Patent number: 8872596
    Abstract: The present invention relates to a polar signal generator and method of deriving phase and amplitude components from in-phase (I) and quadrature-phase (Q) components of an input signal, wherein the I and Q components are generated at a first sampling frequency based on the input signal, and are then up-sampled in accordance with a predetermined first interpolation factor (N), to generate up-sampled I and Q components at a second sampling frequency higher than the first sampling frequency. The up-sampled I and Q components are converted into the phase and amplitude components, wherein the converting step is operated at the second sampling frequency. Moreover, the phase and amplitude components can be further up-sampled, optionally by different sampling frequencies, to a third and a fourth sampling frequency. Thereby, I-Q generation and cartesian-to-polar transformation can be performed at lower frequencies, which reduces power consumption.
    Type: Grant
    Filed: June 6, 2007
    Date of Patent: October 28, 2014
    Assignee: NXP, B.V.
    Inventors: Manel Collados Asensio, Nenad Pavlovic, Vojkan Vidojkovic, Paulus T. M. Van Zeijl
  • Patent number: 8873663
    Abstract: A data transmission method includes, in the mobile station apparatus, selecting a PMI and an RI corresponding to an Hermitian transpose of a channel matrix indicative of channel characteristics and calculating a CQI from the PMI. The method further includes transmitting the PMI, the RI, and the CQI to the base station apparatus as feedback information. The method further includes, in the base station apparatus, calculating a first data rate of a case of performing SU-MIMO transmission based on the PMI transmitted from the mobile station apparatus as feedback and calculating a second data rate of a case of performing ZF MU-MIMO transmission based on the PMI. The method further includes selecting a transmission scheme corresponding to a higher data rate between the first and second data rates.
    Type: Grant
    Filed: November 26, 2010
    Date of Patent: October 28, 2014
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hidekazu Taoka, Katsutoshi Kusume, Karim Ibrahim Khashaba, Guido Dietl