Amplitude Modulation Patents (Class 375/300)
  • Patent number: 10205460
    Abstract: A fractional-N frequency synthesizer comprising a multi-phase generator, a multi-path error phase generator; a current combiner; a loop filter connected to the current combiner; an oscillator (150) connected to the loop filter; a frequency divider (160); a SDM connected to both the frequency divider and the multi-phase generator, to generate variable division ratio.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: February 12, 2019
    Assignee: BEKEN CORPORATION
    Inventors: Dawei Guo, Caogang Yu
  • Patent number: 10153807
    Abstract: Methods and apparatus are disclosed for communicating between an aircraft and a terminal when the aircraft is on the ground. The connection between the aircraft and the terminal is made over a ground power line while the aircraft is being supplied with power. The ground power line comprises one or more wires, which are typically unshielded and cause radio interference. At the transmitting end, multiple copies of the same signal offset in phase relative to one another over the ground power line. Each data stream is coupled to a respective wire in the ground power line. At the receiving end, the multiple copies of the signal are extracted from the respective wires of the ground power line and combined to generate a combined signal with improved signal-to-noise ratio. Radio interference is suppressed by transmitting the data streams in a phase offset manner so that the unwanted emissions cancel.
    Type: Grant
    Filed: August 14, 2017
    Date of Patent: December 11, 2018
    Assignee: THE BOEING COMPANY
    Inventor: Fong Shi
  • Patent number: 10103919
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals, the apparatus comprises an encoder for encoding service data corresponding to each of a plurality of data transmission path, wherein each of the data transmission path carries at least one service component, an encoder for encoding signaling data, a frame builder for building at least one signal frame including the encoded service data, a modulator for modulating the at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme and a transmitter for transmitting the broadcast signals carrying the at least one modulated signal frame.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: October 16, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Jongwoong Shin, Jinwoo Kim, Woosuk Ko, Jaeho Hwang, Sungryong Hong
  • Patent number: 10079663
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The method for transmitting broadcast signals comprises encoding DP (data pipe) data carrying at least one service, mapping the encoded DP data onto constellations, time interleaving the mapped DP data, building at least one signal frame including the time interleaved DP data, modulating data in the built at least one signal frame by an OFDM scheme and transmitting the broadcast signals having the modulated data, wherein the at least one signal frame includes emergency alert information.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: September 18, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Byounggill Kim, Woochan Kim, Jaehyung Kim, Sungryong Hong, Chulkyu Mun, Jinyong Choi, Jaeho Hwang, Jongseob Baek, Kookyeon Kwak, Woosuk Ko
  • Patent number: 10075134
    Abstract: There is disclosed an envelope tracking amplification stage comprising an input path and an envelope path and a delay stage in one of the input path and the envelope path, the delay of the delay stage being determined in dependence on the slope polarity of a signal representing the input and whether the signal in the input path leads or lags the signal in the envelope path.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: September 11, 2018
    Assignee: SNAPTRACK, INC.
    Inventor: Nicholas Shute
  • Patent number: 9992003
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The method for transmitting broadcast signals comprises encoding DP (data pipe) data carrying at least one service, mapping the encoded DP data onto constellations, time interleaving the mapped DP data, building at least one signal frame including the time interleaved DP data, modulating data in the built at least one signal frame by an OFDM scheme and transmitting the broadcast signals having the modulated data, wherein the at least one signal frame includes emergency alert information.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: June 5, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Byounggill Kim, Woochan Kim, Jaehyung Kim, Sungryong Hong, Chulkyu Mun, Jinyong Choi, Jaeho Hwang, Jongseob Baek, Kookyeon Kwak, Woosuk Ko
  • Patent number: 9866274
    Abstract: A method is for processing an analog channel signal from a transmission channel. The method may include converting of the analog channel signal to a digital channel signal, and performing a channel estimation digital processing of the digital channel signal. The channel estimation digital processing may include for at least one frame, generating transfer functions of the transmission channel, the transfer functions respectively associated with reference symbols of the frame, and averaging processing of the transfer functions to generate an average transfer function. The method may include decoding of symbols of the frame following the reference symbols using the average transfer function.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: January 9, 2018
    Assignee: STMicroelectronics (Rousset) SAS
    Inventors: Pierre Demaj, Yoann Bouvet
  • Patent number: 9742607
    Abstract: A transmitter transmits payload data using Orthogonal Frequency Division Multiplexed (OFDM) symbols. The transmitter comprises a frame builder configured to receive the payload data to be transmitted and to receive first signalling data for use in detecting and recovering the payload data at a receiver, and to form the payload data and the first signalling data into frames for transmission, the first signalling data forming a part of the frames with the payload data. A modulator is configured to modulate a first OFDM symbol with the first signalling data and to modulate one or more second OFDM symbols with the payload data. A signature sequence processor provides a signature sequence, a combiner combines the signature sequence with the first OFDM symbol, and a transmission unit transmits the first and second OFDM symbols.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: August 22, 2017
    Assignee: SONY CORPORATION
    Inventors: Samuel Asangbeng Atungsiri, Jan Zoellner
  • Patent number: 9712364
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals, the apparatus comprises an encoder for encoding service data corresponding to each of a plurality of data transmission path, wherein each of the data transmission path carries at least one service component, an encoder for encoding signaling data, a frame builder for building at least one signal frame including the encoded service data, a modulator for modulating the at least one signal frame by an OFDM (Orthogonal Frequency Division Multiplex) scheme and a transmitter for transmitting the broadcast signals carrying the at least one modulated signal frame.
    Type: Grant
    Filed: February 10, 2016
    Date of Patent: July 18, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Jongwoong Shin, Jinwoo Kim, Woosuk Ko, Jaeho Hwang, Sungryong Hong
  • Patent number: 9674829
    Abstract: A method for receiving downlink channels at a user equipment in a wireless communication system. The method according to one embodiment includes monitoring a downlink control channel in a subframe including a plurality of symbols from the base station; and decoding a downlink data channel in the subframe according to the downlink control channel. If a parameter on a starting symbol of the downlink control channel within the plurality of symbols is configured via Radio Resource Control (RRC) layer signaling, the starting symbol of the downlink control channel is determined according to the parameter, otherwise, the starting symbol of the downlink control channel is determined according to a control format indicator.
    Type: Grant
    Filed: April 14, 2015
    Date of Patent: June 6, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Hakseong Kim, Hanbyul Seo, Kijun Kim
  • Patent number: 9621393
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed. The method for transmitting broadcast signals comprises encoding DP (data pipe) data carrying at least one service, mapping the encoded DP data onto constellations, time interleaving the mapped DP data, building at least one signal frame including the time interleaved DP data, modulating data in the built at least one signal frame by an OFDM scheme and transmitting the broadcast signals having the modulated data, wherein the at least one signal frame includes emergency alert information.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: April 11, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Byounggill Kim, Woochan Kim, Jaehyung Kim, Sungryong Hong, Chulkyu Mun, Jinyong Choi, Jaeho Hwang, Jongseob Baek, Kookyeon Kwak, Woosuk Ko
  • Patent number: 9621200
    Abstract: Various embodiments of communication systems and methods in which the communication system is operative to find, record, and use sets of pre-distortion parameters in conjunction with a pre-distortion procedure, in which each said set of pre-distortion parameters is operative to specifically counter distortions produced in a power amplifier by a specific combination of level of input signal power and level of analog gain associated with a transmission path of the communication system. In some embodiments, there is a modulator, a transmission chain, a distortion analysis mechanism, and a pre-distortion mechanism, operative to analyze and modify signals so as to counter signal distortion.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: April 11, 2017
    Assignee: Redline Communications Inc.
    Inventors: Mohammad Janani, Jahan Ghofraniha, Med A. Nation
  • Patent number: 9608850
    Abstract: A spintronic wireless communication system for simultaneously modulating multiband frequencies and amplitudes includes a plurality of spin-torque transfer devices which have different frequency characteristics from each other, and OOK modulate or multi-level ASK modulate input data to thereby output a multiband OOK modulation signal or a multiband, multi-level ASK modulation signal; a plurality of matching networks which match individual impedances of the plurality of spin-torque transfer devices; and a broadband antenna which receives the multiband OOK modulation signal or the multiband, multi-level ASK modulation signal from ends of the plurality of matching networks and simultaneously transmits the signals to the outside.
    Type: Grant
    Filed: November 1, 2013
    Date of Patent: March 28, 2017
    Assignees: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, KOREA BASIC SCIENCE INSTITUTE, KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: InnYeal Oh, ChulSoon Park, MinChul Shin, SeungYoung Park, ByoungChul Min, SukHee Han
  • Patent number: 9577771
    Abstract: Systems and method for improving operation of a radio frequency system are provided. One embodiment provides a radio frequency system that includes an amplifier device with a first data path and a second data path. Additionally, the radio frequency system includes a controller that instructs the radio frequency system to transmit a calibration signal, which includes a first portion that excites the first data path and a second portion that excites the second data path; determines time skew between the first and second data paths based at least in part on phase shift between a first sample of a feedback signal and the first portion, phase shift between a second sample of the feedback signal and the second portion, or both; and instructs the radio frequency system to adjust delay applied on the first data path, the second data path, or both based at least on the time skew.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: February 21, 2017
    Assignee: APPLE INC.
    Inventors: Navid Lashkarian, Saeed Chehrazi, Ali Parsa
  • Patent number: 9544002
    Abstract: The disclosure is directed to a circuit arrangement and method that provide efficient concurrent transmit and receive, transmit only and receive only of wireless signals. In one implementation, a circuit arrangement is provided that incorporates uses a single antenna to achieve concurrent transmit and receive, transmit only and receive only of wireless signals. A dual amplifier structure may be provided, and at least one of the amplifiers associated with the dual amplifier structure is amplitude tunable in order to ensure that each amplifier of the dual amplifier structure provides substantially the same or the same signal amplification. Unwanted transmit signals detected by a receiving circuit arrangement may be used to cause a processor to generate a digital code word that is used to modify a signal amplification provided by at least one of the amplifiers associated with the dual amplifier structure.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: January 10, 2017
    Assignee: Intel IP Corporation
    Inventors: Benjamin Jann, Hasnain Lakdawala
  • Patent number: 9544893
    Abstract: In a wireless communication system, when a terminal receives control information from a downlink subframe, which is divided into a Physical Downlink Control Channel (PDCCH) region and a Physical Downlink Shared Channel (PDSCH) region, in a wireless communication system, the receiving of the control information includes: receiving, from a base station, first CFI information indicating the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols available for Physical Downlink Control Channel (PDCCH) transmission; receiving, from the base station, second CFI information indicating start OFDM symbol information available for Physical Downlink Shared Channel (PDSCH) transmission corresponding to an enhanced Physical Downlink Control Channel (E-PDCCH); and receiving the PDSCH from the base station on the basis of the first CFI information or the second CFI information.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: January 10, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Kitae Kim, Jinyoung Chun, Sunam Kim, Jiwon Kang, Binchul Ihm, Sungho Park
  • Patent number: 9503068
    Abstract: In an embodiment, a supply voltage envelope detector circuit is configured to detect a shape of the supply voltage over time and to compare the detected shape to expected shapes that indicate voltage droop events for which corrective action may be needed. The expected shapes may be predetermined based on one or more of: the design of the integrated circuit that includes the supply voltage envelope detector circuit; attributes of the power management unit (PMU) that is to generate the supply voltage for the integrated circuit; and/or attributes of the system that includes the integrated circuit. The shape of the voltage droop may experience little variation during use, and thus may be used to detect a droop event earlier and more accurately than a threshold-based mechanism, in some embodiments.
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: November 22, 2016
    Assignee: Apple Inc.
    Inventors: Joseph T. DiBene, II, Sanjay Pant, Sotirios Zogopoulos, Jafar Savoj, Inder M. Sodhi
  • Patent number: 9350295
    Abstract: A modulation circuit includes a load and a transistor serving as a switch. The transistor has an oxide semiconductor layer in which hydrogen concentration is 5×1019/cm3 or less. The off-state current of the transistor is 1×10?13 A or less. A modulation circuit includes a load, a transistor serving as a switch, and a diode. The load, the transistor, and the diode are connected in series between the terminals of an antenna. The transistor has an oxide semiconductor layer in which hydrogen concentration is 5×1019/cm3 or less. An off-state current of the transistor is 1×10?13 A or less. On/off of the transistor is controlled in accordance with a signal inputted to a gate of the transistor. The load is a resistor, a capacitor, or a combination of a resistor and a capacitor.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: May 24, 2016
    Assignee: Semiconductor Energy Laboratoty Co., Ltd.
    Inventor: Koichiro Kamata
  • Patent number: 9198176
    Abstract: In a wireless communication system, when a terminal receives control information from a downlink subframe, which is divided into a Physical Downlink Control Channel (PDCCH) region and a Physical Downlink Shared Channel (PDSCH) region, in a wireless communication system, the receiving of the control information includes: receiving, from a base station, first CFI information indicating the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols available for Physical Downlink Control Channel (PDCCH) transmission; receiving, from the base station, second CFI information indicating start OFDM symbol information available for Physical Downlink Shared Channel (PDSCH) transmission corresponding to an enhanced Physical Downlink Control Channel (E-PDCCH); and receiving the PDSCH from the base station on the basis of the first CFI information or the second CFI information.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: November 24, 2015
    Assignee: LG ELECTRONICS INC.
    Inventors: Kitae Kim, Jinyoung Chun, Sunam Kim, Jiwon Kang, Binchul Ihm, Sungho Park
  • Patent number: 9198005
    Abstract: A digital broadcast receiving system includes a known data detector, a carrier recovery unit, and a timing recovery unit. The known data detector may detect known data information inserted and transmitted from a digital broadcast transmitting system and using the known data information to estimate initial frequency offset. The carrier recovery unit may obtain initial synchronization by using the initial frequency offset, and may detect frequency offset from the received data by using the known sequence position indicator so as to perform carrier recovery. The timing recovery unit may detect timing error information from the received signal by using the known sequence position indicator so as to perform timing recovery.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: November 24, 2015
    Assignee: LG ELECTRONICS INC.
    Inventors: Jong Moon Kim, In Hwan Choi, Kook Yeon Kwak, Byoung Gill Kim, Won Gyu Song, Jin Woo Kim, Hyoung Gon Lee
  • Patent number: 9184773
    Abstract: Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: November 10, 2015
    Assignee: VAYYAR IMAGING LTD.
    Inventors: Zivi Nadiri, Jonathan Rosenfeld, Naftali Chayat
  • Patent number: 9084119
    Abstract: Systems and methodologies are described that facilitate employing fractional frequency reuse within carriers in a multicarrier heterogeneous wireless communication environment. Each carrier can be divided into a plurality of frequency reuse sets. Moreover, each of the frequency reuse sets from each carrier can be categorized as being for one of unrestricted reuse or restricted reuse. Further, a downlink transmission can be scheduled upon resources of at least a first subset of frequency reuse sets from a first carrier bandwidth and a second subset of frequency reuse sets from a second carrier bandwidth. For example, the resources can be scheduled based upon a power class of a base station, categorizations of the frequency reuse set (e.g., unrestricted reuse versus restricted reuse, . . . ), and/or received feedback related to downlink channel conditions.
    Type: Grant
    Filed: January 5, 2010
    Date of Patent: July 14, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Jelena M. Damnjanovic, Naga Bhushan, Juan Montojo
  • Publication number: 20150139362
    Abstract: A pulse shaping circuit is configured to shape a waveform of an edge of a signal applied to a switch of a power amplifier included in an on-off keying transmitter.
    Type: Application
    Filed: February 26, 2014
    Publication date: May 21, 2015
    Applicants: POSTECH ACADEMY-INDUSTRY FOUNDATION, SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jae Sup LEE, Bum Man KIM, Han-Kyu LEE, Dae Chul JEONG, Tae Young CHUNG
  • Patent number: 9030240
    Abstract: A signal processing device enables a high quality enhanced signal to be obtained, and includes: a transform unit which transforms a mixed signal in which a first signal and a second signal are mixed, into a phase component and an amplitude component or a power component in each frequency; a first control unit which rotates the phase component in a predetermined frequency; a second control unit which compensates the amplitude component or the power component in the predetermined frequency according to the amount of change of the amplitude component or the power component rotated by the first control unit; and a synthesizing unit which synthesizes the phase component rotated by the first control unit, and the amplitude component or the power component compensated by the second control unit.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: May 12, 2015
    Assignee: NEC Corporation
    Inventor: Ryoji Miyahara
  • Publication number: 20150124905
    Abstract: A carrier state modulator system is described in which a stream of digital data bits is encoded by modulating the amplitude or phase of a carrier wave. A transmitter directly modulates the amplitude or phase of a selected number of cycles of the carrier in accordance with the state of each digital data bit. This method of direct generation of an amplitude or phase modulated carrier wave differs from mixing a phase amplitude baseband modulation onto a higher carrier frequency.
    Type: Application
    Filed: January 8, 2015
    Publication date: May 7, 2015
    Inventor: William A. GANTER
  • Patent number: 9025699
    Abstract: For use in a transmitter in a wireless network, a transmitter apparatus is configured for digital multi-level outphasing. The apparatus includes a bandwidth reduction (BWR) modulator block configured to receive a phase modulated carrier and reduce a bandwidth of the phase modulated carrier using amplitude modulation. The apparatus also includes an outphasing modulator block configured to receive the reduced-bandwidth phase modulated carrier and an amplitude modulated signal, and convert the reduced-bandwidth phase modulated carrier into a plurality of phase modulated signals. The apparatus further includes an amplification stage comprising a plurality of power transistors configured to amplify the phase modulated signals.
    Type: Grant
    Filed: May 13, 2013
    Date of Patent: May 5, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Ernesto G. Jeckeln
  • Patent number: 9025430
    Abstract: A system, method and node for modulation and coding scheme adjustment for a Long Term Evolution (LTE) shared Data Channel. The method determines an actual number of orthogonal frequency division multiplexing (OFDM) symbols, NOS utilized for the shared Data Channel. A modulation order for transmission of data on the shared Data Channel is increased when the actual number of OFDM symbols NOS is less than 11 and decreased when NOS is more than 11. A modulation and coding scheme field (IMCS) of a downlink control information of the shared Data Channel may also be determined. If 0?IMCS+11?NOS?28, the modulation order is modified by utilizing a factor of (IMCS+11?NOS) in a standardized modulation scheme. If it is determined that IMCS+11?NOS<0, the modulation order is set to Quadrature Phase Shift Keying (QPSK). If it is determined that IMCS+11?NOS>28, the modulation order is set to 64 Quadtrative Amplitude Modulation (64QAM).
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: May 5, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Jung-Fu Cheng, Yang Hu
  • Patent number: 9020071
    Abstract: An Amplitude-Shifted-Keyed (ASK) modulator/transmitter has fall time enhanced by pulsing pull-up and pull-down enhancement switches on for a short period of time after a data transition. The enhancement switches draw energy from a coupling capacitor to more rapidly reduce an amplitude of the carrier wave being output. An input carrier wave is applied to gates of p-channel and n-channel current sources that drive the coupling capacitor. Gates of the n-channel and p-channel enhancement switches also receive the input carrier wave when data is high, but are disabled when data is low. Multiple p-channel and n-channel transistors may be used in parallel for each current source or enhancement switch. Each of the multiple transistors in parallel has a gate that is AND'ed with an index signal. The index signals are programmable and determine how many of the parallel transistors are enabled, thus determining the aggregate current.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: April 28, 2015
    Assignee: Hong Kong Applied Science & Technology Research Institute Company, Limited
    Inventor: Tat Fu Chan
  • Publication number: 20150110224
    Abstract: An interface device for performing on-off keying (OOK) modulation and a transmitter using the interface are disclosed. The interface device includes a first inverter and a second inverter. The first inverter outputs a signal to a first output terminal based on a digital baseband signal when the digital baseband signal is applied thereto. The second inverter outputs a signal to a second output terminal based on a signal obtained by inverting the phase of the digital baseband signal when the digital baseband signal is applied thereto.
    Type: Application
    Filed: October 16, 2014
    Publication date: April 23, 2015
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Taeyoung KANG, Byounggun CHOI, Kyunghwan PARK
  • Patent number: 9008230
    Abstract: In one embodiment, an apparatus is provided that includes a first circuit configured and arranged to provide a modulated carrier signal in response to a signal provided from the antenna. The modulated carrier signal conveys data using peaks or amplitudes of the carrier signal. A second circuit is configured to rectify the modulated carrier signal and integrate the rectified signal in response to a first clock signal. A third circuit is coupled to an output of the second circuit and is configured to sample the integrated signal values and provide therefrom a sample-based approximation of the modulated carrier signal.
    Type: Grant
    Filed: January 8, 2013
    Date of Patent: April 14, 2015
    Assignee: NXP B.V.
    Inventors: Remco C. VandeBeek, Massimo Ciacci, Ghiath Al-kadi
  • Patent number: 9008226
    Abstract: A method and apparatus for transmit signal pulse shaping. Automotive vehicle manufacturers that incorporate electronic components into an automotive vehicle must consider emission requirements masks that can be dependent on particular geographic markets as well as the other electronic components contained within a particular automotive vehicle design. A physical layer device is provided that can be configured to operate in multiple emissions configurations using configurable parameters.
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: April 14, 2015
    Assignee: Broadcom Corporation
    Inventors: Ahmad Chini, Seyed Hamidi, Mehmet Vakif Tazebay
  • Publication number: 20150092887
    Abstract: A transmission system includes two sections. First transmitter section, located some distance from antenna, generates low power RF signal, which may be converted to digital format, modified for digital signal transport to second section transmitter, or it may transport low power RF analog signal to second section transmitter. The second section transmitter accepts signal from the first part transmitter. The incoming signal may be either pre-amplified for RF power amplifier, or if the imported signal is in the digital form it is converted into analog signal and pre-amplified for RF power amplifier. After final RF power amplification in the second section of the RF transmitter, the signal is transmitted directly to antenna radiating elements without transmission line.
    Type: Application
    Filed: September 30, 2013
    Publication date: April 2, 2015
    Inventor: Richard Strnad
  • Patent number: 8995537
    Abstract: The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting uplink control information in a wireless communication system. A method for transmitting uplink control information in a wireless communication system according to one embodiment of the present invention comprises a step of repetition coding information bit of N-bit to generate an encoded bit; and a step of transmitting the encoded bit via a physical uplink shared channel, wherein bit inversion can be applied to the bit obtained by repeating the information bit of N-bit, on the basis of the number 1 contained in the information bit of N-bit.
    Type: Grant
    Filed: April 27, 2011
    Date of Patent: March 31, 2015
    Assignee: LG Electronics Inc.
    Inventors: Hyun Soo Ko, Moon Il Lee, Ji Woong Jang, Jae Hoon Chung, Seung Hee Han
  • Patent number: 8989244
    Abstract: A receiver is provided that receives signals from a device under test (DUT) for one or more modes of operation. For each mode, the system detects beacon transmission signals from the DUT, and counts the number of beacons for a period of time. If the count is not consistent with an expected count, e.g. a stored value, the system may preferably provide an output to indicate that there is a problem with the DUT. If the count is consistent with the expected count, the system may preferably perform further testing for other modes of operation. If the count output of the DUT is consistent with expected counts over each of the operation modes, the system may provide an indication that the DUT has passed the beacon tests.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: March 24, 2015
    Assignee: NETGEAR, Inc.
    Inventors: Joseph Amalan Arul Emmanuel, Jonathan M. Hummel, Shahrokh M. Zardoshti
  • 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: 8976846
    Abstract: A wireless transmission system includes a wireless HDMI transmitter and a wireless HDMI receiver. The wireless HDMI transmitter includes a carrier oscillator provided for each channel of an HDMI transmission path to output a carrier signal in a millimeter band, an OOK modulator provided for each carrier oscillator to perform on-off keying modulation on a carrier signal outputted by its corresponding carrier oscillator, and an input circuit provided for each channel of the HDMI transmission path to input a digital signal outputted by a source device to the OOK modulator. Radio signals have different planes of polarization from their adjacent channels.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: March 10, 2015
    Assignees: Silicon Library Inc., Hitachi Chemical Co., Ltd., Hiroshima University
    Inventors: Junzoh Shimizu, Minoru Fujishima, Masahiko Ohta, Toshio Takada
  • Publication number: 20150063828
    Abstract: Systems that allow for DFE functionality to be eliminated from the receiver side of a communication system and for a DFE-like functionality to be implemented instead at the transmitter side of the communication system are provided. By removing the DFE functionality from the receiver side, error propagation can be eliminated at the receiver and receiver complexity can be reduced drastically. At the transmitter side, the DFE-like functionality provides the same DFE benefits, and with the transmitter environment being noise-free, no errors can occur due noise boosting, for example. The DFE-like functionality at the transmitter side can be implemented using non-linear (recursive or feed-forward) pre-coders or a combination of non-linear pre-coders and linear filters, which can be configured to invert a net communication channel between the transmitter and the receiver. Embodiments particularly suitable for fiber optic channels and server backplane channels are also provided.
    Type: Application
    Filed: September 30, 2013
    Publication date: March 5, 2015
    Inventors: William BLISS, Vasudevan PARTHASARATHY
  • Patent number: 8971823
    Abstract: Techniques to enhance the performance in a wireless communication system using segments called subbands and using precoding are shown. According to one aspect, the bandwidth for transmission to an access terminal is constrained to a preferred bandwidth which is less than the bandwidth available for transmission to an access terminal and precoding information related to the subcarriers within the constrained bandwidth is provided to a transmitter. The precoding information related to the subcarriers within a constrained bandwidth provides feedback about the forward link channel properties relative to different subbands and may be fed back on a channel associated with the bandwidth.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: March 3, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Dhananjay Ashok Gore, Hemanth Sampath, Jibing Wang, Tamer Kadous, Gwendolyn D. Barriac
  • Patent number: 8971399
    Abstract: An apparatus for transmitting a high efficiency variable power includes a pulse generating unit configured to generate a pulse signal comprising a pulse having a duration corresponding to an amount of power transmitted; a pulse stream generating unit configured to convert the pulse signal to a pulse stream having pulse shape corresponding to the duration of the pulse and data to be transmitted; and a high frequency modulating unit configured to output a variable power by modulating a high frequency signal having a constant amplitude on a time axis by repeatedly outputting and not outputting the high frequency signal based on the pulse stream.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: March 3, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sang Wook Kwon, Jin Sung Choi, Ki Young Kim, Nam Yun Kim, Dong Zo Kim, Yun Kwon Park, Eun Seok Park, Young Ho Ryu, Chang Wook Yoon, Young Tack Hong
  • Patent number: 8971446
    Abstract: A baseband signal is generated as a sequence of complex sample values at a predetermined sample rate. A sample of the baseband signal is captured as is a sample of an output signal generated by a power amplifier from the captured sample of the baseband signal. Complex values are iteratively assigned to a complex factor intended for predistorting data such that the product of the baseband signal sample and the complex factor converges towards equivalence with the output signal sample with each iterative assignment of the complex values to the complex factor. The complex factor is stored in memory at an address associated with the value of the captured baseband signal sample.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: March 3, 2015
    Assignee: MStar Semiconductor, Inc.
    Inventor: Khurram Muhammad
  • Patent number: 8964818
    Abstract: A short reach communication system includes a plurality of communication SERDES that communicate data over a short reach channel medium such as a backplane connection (e.g., PCB trace) between, for example, chips located on a common PCB. A multi-level modulated data signal is generated to transmit/receive data over the short reach channel medium. Multi-level modulated data signals, such as four-level PAM, reduce the data signal rate therefore reducing insertion loss, power, complexity of the circuits and required chip real estate.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: February 24, 2015
    Assignee: Broadcom Corporation
    Inventors: Lorenzo Longo, Vivek Telang
  • Patent number: 8948306
    Abstract: Systems and methods are provided for generating a modulated radio frequency (RF) output signal representing a baseband input signal. A digitizer is configured to sample the baseband input signal and produce an N-bit binary digital signal representing a scaled linear function of the signal amplitude. An RF signal source configured to produce an RF carrier signal. N amplifier paths each include at least one amplifier configured to receive the RF carrier signal as an input and provide a corresponding output RF signal. The amplifiers associated with each of the N amplifier paths are active only when a corresponding bit of the digital signal assumes a first value. A power combiner assembly is configured to combine the outputs of the plurality of amplifier paths to deliver the modulated RF output signal.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: February 3, 2015
    Assignee: Gatesair, Inc.
    Inventors: Dmitri Borodulin, George Cabrera
  • Patent number: 8948307
    Abstract: According to one embodiment, an ASK signal generator includes a differential oscillator, a first modulator, a second modulator, a first transmission line, a second transmission line and an impedance adjustment circuit. The differential oscillator generates first and second signals having an opposite phase, and outputs the first and second signals from first and second output terminals. The first modulator connected to the first output terminal is set in the normally off state. The second modulator connected to the second output terminal is turned on or off according to a digital signal. The first and second transmission lines connected to the first and second output terminals have a length equal to a ¼ wavelength of the oscillation frequency of the differential oscillator. The impedance adjustment circuit is operated together with the second modulator according to the digital signal.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: February 3, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Ryuichi Fujimoto
  • Patent number: 8942315
    Abstract: Systems, methods, and devices are disclosed for implementing frequency calibration circuits. The devices may include a data source configured to generate a first data signal based on a first data value and a second data signal based on a second data value. The devices may include a gain control circuit configured to receive the first and second data signals from the data source, and generate a first modified data signal and a second modified data signal. The devices may include an oscillator circuit configured to generate a first output signal and a second output signal based, at least in part, on the first and second modified data signals. The devices may include a calibration circuit configured to determine an adjustment value based on the first and second output signals, and further configured to change a gain of the gain control circuit based on the determined adjustment value.
    Type: Grant
    Filed: September 23, 2014
    Date of Patent: January 27, 2015
    Assignee: Cypress Semiconductor Corporation
    Inventors: Marshall Wang, Miaoxing Xie
  • Publication number: 20150003566
    Abstract: A transmitter power supply modulates an RF signal without needing to run a calibration/training cycle every time an exciter or PA module is switched in and out or every time the transmitter powers up. During calibration of the exciter module, an exciter module delay factor is determined, and stored in the exciter module, for each signal modulation scheme that may be implemented by the exciter module. During calibration of a power amplifier (PA) module, a power supply modulation (PSM) delay factor is determined for, and stored in, the PA module. During transmitter operation, the exciter module generates RF and envelope signals based on an input signal. The PA module generates a power supply voltage based on the envelope signal and a final delay factor, which final delay factor is based on the exciter module and PSM delay factors. The PA module then modulates the RF signal using the power supply voltage.
    Type: Application
    Filed: June 26, 2013
    Publication date: January 1, 2015
    Inventor: Rizwan Murji
  • Patent number: 8923436
    Abstract: An RF signal generator divides an input radio signal into an amplitude signal and a phase signal and outputs the amplitude signal and the phase signal. A switching amplifier amplifies the radio signal with the amplitude signal and the phase signal. The switching amplifier includes at least one variable current source that is controlled by the amplitude signal and supplies a current to the switching amplifier. The switching amplifier includes at least one switching elements that connects the variable current source to one of a terminal connected a ground potential and an output terminal of the switching amplifier according to the phase signal.
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: December 30, 2014
    Assignee: Nec Corporation
    Inventor: Shinichi Hori
  • Publication number: 20140376665
    Abstract: A method of mapping a plurality of different bit sequences to a plurality of different signal points in a constellation, the number of bit sequences being greater than the number of signal points. The method includes, for a device in a telecommunication network, the acts of: determining, for each signal point in the constellation, a number of bit sequences to be mapped to each signal point, the numbers of bit sequences being distributed according to a discrete Gaussian distribution among the constellation, selecting in the plurality of bit sequences, for each signal point in the constellation, a set including the determined number of bit sequences (u) that minimize the maximal Hamming distance among the selected sets.
    Type: Application
    Filed: December 14, 2012
    Publication date: December 25, 2014
    Inventors: Baoming Bai, Lin Zhou, Yajuan Luo
  • 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: 8908799
    Abstract: Systems and methods of performing ASK or QAM modulation with uneven distance between symbols are provided. Different bit positions mapped to such symbols are assigned to different receivers, with the result that there are different BER performances among bits sent from a transmitter to the different receivers. Bits for multiple receivers are mapped to a UASK constellation or a UQAM constellation without using superposition.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: December 9, 2014
    Assignee: Blackberry Limited
    Inventors: Shouxing Qu, Yan Xin, Johanna Lisa Dwyer
  • Patent number: 8909381
    Abstract: An irrigation control device having a modulator that modulates data onto an alternating power signal by distorting amplitude of a first leading portion of selected cycles of the alternating power signal, and permit effectively a full amplitude of the alternating power signal on a following portion of the selected cycles, wherein the first leading portion and the following portion are either both on a high side of a cycle or both on a low side of a cycle of the alternating power signal. The irrigation control device further includes an interface configured to couple the modulator to a multi-wire interface coupled to a plurality of irrigation devices to permit the alternating power signal to be applied to the multi-wire interface.
    Type: Grant
    Filed: August 9, 2013
    Date of Patent: December 9, 2014
    Assignee: Rain Bird Corporation
    Inventor: Timothy J. Crist