Amplitude Modulation Patents (Class 375/268)
  • Patent number: 10627214
    Abstract: The invention relates to a method for electronically analyzing a time-variant signal (Ue(t)) having at least one extreme value, the amplitude and time of which are to be detected, by means of a detection circuit that operates as a peak value store and follows the time-variant signal after a threshold value (Us) is exceeded until the maximum amplitude is reached, wherein exceedance of the extreme value results in a peak indicator signal (Usi(t)) being generated and the maximum amplitude being stored, which is characterized in that to capture more than one extreme value in the time-variant signal, the tracking of the signal (Ue(t)) is deactivated after production of the first peak indicator signal and after a drop below the threshold value and, after the signal exceeds the threshold value again as time progresses, further tracking of the signal (Ue(t)) is activated until the next extreme value to be detected is reached and a further peak indicator signal (Usi(t)) is generated and this further maximum amplitude
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: April 21, 2020
    Assignee: Nanofocus AG
    Inventors: Johannes Frank, Gerd Jakob, Michael Spengler
  • Patent number: 10396975
    Abstract: A system includes a tank circuit, a synchronization circuit, a transmitter, and a control circuit. The tank circuit is configured to receive a first signal transmitted from a near field communication reader. The synchronization circuit is configured to synchronize a clock to the first signal. The transmitter is configured to transmit data using the clock from the tank circuit to the near field communication reader using active load modulation. The control circuit is configured to disable the synchronization circuit during a modulation period of the active load modulation and to reduce energy remaining in the tank circuit at an end of the modulation period.
    Type: Grant
    Filed: June 23, 2017
    Date of Patent: August 27, 2019
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Jonathan C.H. Hung, Thomas Michael Maguire
  • Patent number: 10334421
    Abstract: Disclosed is a near field communication device which includes an antenna, a transmission amplifier, a matching circuit connected between the antenna and the transmission amplifier, and a transmitter. The transmitter transmits a transmit clock to the matching circuit through the transmission amplifier, extracts an extraction clock from a waveform formed in the matching circuit, stores a phase difference between the transmit clock and the extraction clock, and controls transmission of an information signal through the antenna, the transmission amplifier, and the matching circuit based on the phase difference.
    Type: Grant
    Filed: March 14, 2017
    Date of Patent: June 25, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jongpil Cho, Youngjoo Lee
  • Patent number: 10122557
    Abstract: A method of wireless communication includes transmitting frames from a transponder to a reader and synchronizing between a reader carrier frequency and an active load modulation (ALM) carrier frequency within each transmitted frame. Each transmitted frame includes ALM carrier bursts generated from subcarrier modulation by binary phase shift keying (BPSK) data encoding and producing signal oscillations at a transponder antenna after each ALM carrier burst generation, The synchronizing occurs at each phase change of the data encoding when no burst is generated during a half period of the subcarrier preceding the phase change and a half period of the subcarrier following this phase change. The transponder antenna has a moderate quality factor sufficient to naturally damp the signal oscillations so that the synchronizing is performed without performing any controlled signal oscillations damping.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: November 6, 2018
    Assignee: STMICROELECTRONICS RAZVOJ POLPREVODNIKOV D.O.O.
    Inventors: Maksimiljan Stiglic, Kosta Kovacic
  • Patent number: 9900847
    Abstract: A headend device includes a spectrum analysis unit configured to analyze a frequency spectrum of a plurality of base station signals to detect characteristic information of the plurality of the base station signals, a control unit configured to generate a control signal to control a power of the plurality of the base station signals on the basis of the characteristic information detected, and a plurality of RF units configured to receive at least one of the plurality of the base station signals and adjust the power of the base station signals received according to the control signal and output the power-adjusted base station signals.
    Type: Grant
    Filed: October 15, 2014
    Date of Patent: February 20, 2018
    Assignee: SOLiD, INC.
    Inventors: Yeong Shin Yeo, Bong Cheol Na
  • Patent number: 9582451
    Abstract: In accordance with an embodiment, a receiver includes a first state machine configured to be coupled to a bus. The first state machine is configured to determine that a first output signal is a first symbol if a first received bus signal transitions from a first bus state to a second bus state and stays in the second bus state for less than a first predetermined period of time, and the first output signal is a second symbol if the first received bus signal transitions from the first bus state to the second bus state and stays in the second bus state for at least the first predetermined period of time.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: February 28, 2017
    Assignee: Infineon Technologies AG
    Inventors: Paul Wallner, Dieter Metzner, Martin Streibl
  • Patent number: 9401801
    Abstract: A wireless communications device that produces phase-synchronized local oscillator (LO) signals. The device includes a first transceiver chain to receive a first timing signal and a second transceiver chain to receive the first timing signal and a second timing signal. The first transceiver chain includes a first frequency divider to convert the first timing signal to a first LO signal. The second transceiver chain includes a multiplexer to select one of the timing signals based at least in part on a mode select signal. A second frequency divider in the second transceiver chain converts the selected timing signal to a second LO signal, and a phase alignment circuit aligns a phase of the second LO signal with a first alignment signal. The first alignment signal is activated, for a limited duration, in response to a change in state of the mode select signal.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: July 26, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Hyunsik Park, Lalitkumar Nathawad, Shahram Abdollahi-Alibeik
  • Patent number: 9160489
    Abstract: Systems and methods associated with origin dodging for a transmitted signal are described. One method includes receiving a transmission sequence for transmission to a receiver. The transmission sequence includes a sequence of transmit symbols and each transmit symbol corresponds to a coordinate pair positioning the transmit symbol's phase on an I-Q plane. The method includes sampling and filtering the transmission sequence to create transition samples and determining whether any transition sample is within a predetermined radius of an origin of the I-Q plane. When a transition sample is positioned within the radius, the method includes generating a dodging symbol and inserting the dodging symbol into the transmission sequence to create a modified transmission sequence. A filtered signal that includes filtered samples of the modified transmission sequence is provided.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: October 13, 2015
    Assignee: MARVELL INTERNATIONAL LTD.
    Inventors: Luns Tee, Swaroop Venkatesh, Ankit Sethi
  • 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: 9025503
    Abstract: A communications network (20) comprises a network coding node (24) and a network decoding node (26). A method of operating a communications network (20) comprises, at the network coding node (24), performing multi-domain network coding upon a first signal and a second signal to obtain a network coded signal. The first signal is modulated by a first modulation scheme and the second signal is modulated by a second modulation scheme. At least one of the first signal and the second signal includes information in a phase domain and information in an amplitude domain. The method further comprises transmitting the network coded signal over a link to a receiver (26) and performing multi-domain network decoding of the network coded signal as detected at the receiver (26) to obtain the second signal, the receiver knowing and using the first signal for the multi-domain network decoding.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: May 5, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Jawad Manssour
  • Patent number: 9014293
    Abstract: Systems and methods for transpositional modulation and demodulation are provided. One such method for generating a signal includes the steps of providing a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level; receiving an input signal; and outputting quarter-cycle waveforms associated with levels of the received input signal. Systems for transpositional modulation are also provided. One such system for generating a signal includes a look-up table having a plurality of quarter-cycle waveforms. Each of the quarter-cycle waveforms are associated with a respective input level, and the look-up table is configured to receive an input signal, and output quarter-cycle waveforms associated with levels of the received input signal.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 21, 2015
    Assignee: TM IP Holdings, LLC
    Inventor: Richard C. Gerdes
  • 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: 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
  • 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
  • Publication number: 20150023446
    Abstract: A signal transmission device includes a signal sender that sends first and second transmission signals of mutually opposite phases, a first transmission path over which the first transmission signal is transmitted, a second transmission path over which the second transmission signal is transmitted, and a signal receiver that converts the first transmission signal received from the first transmission path and the second transmission signal received from the second transmission path into an output signal of a single phase. The signal transmission device differentiates each amplitude of the first and second transmission signals sent from the signal sender, and the signal receiver, based on an amplitude ratio of the first and second transmission signals, converts the received first and second transmission signals.
    Type: Application
    Filed: July 2, 2014
    Publication date: January 22, 2015
    Inventor: Shinichi Kodama
  • Publication number: 20150023445
    Abstract: A communication system utilizing adaptive envelope tracking includes a transmit path, a feedback receiver, a parameter component and an envelope tracking component. The transmit path is configured to generate a transmit signal. The feedback receiver is configured to generate a feedback signal from the transmit signal. The parameter component is configured to generate linearity parameters from the feedback signal and the baseband signal. The envelope tracking component is configured to generate a supply control signal having time delay adjustments.
    Type: Application
    Filed: July 18, 2013
    Publication date: January 22, 2015
    Inventors: Andrea Camuffo, Alexander Belitzer, Bernhard Sogl
  • 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
  • Patent number: 8907737
    Abstract: Techniques and mechanisms for configuring logic to implement a signal modulation. In an embodiment, the logic includes a finite impulse response (FIR) module comprising circuitry. The selection circuitry may be operable to concurrently receive signals from latch circuitry of the FIR module and, based on the signals, to select an input group of the selection circuitry and to output a voltage identifier. In another embodiment, configuration logic is operable to set an operational mode which determines a total number of concurrent input signals, received by the FIR module, which the FIR module will use to select an input group for generating an output representing a voltage level.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: December 9, 2014
    Assignee: Intel Corporation
    Inventors: Harry Muljono, Donald L. Faw, Charlie Lin, Stefan Rusu
  • Patent number: 8903017
    Abstract: Array amplitude modulation which includes mapping a data symbol to a phase modulation signal and an amplitude modulation signal for transmission from antenna elements; applying the phase modulation signal to the antenna element amplifiers; and generating a pattern of enabling/disabling the antenna element amplifiers as a function of the amplitude modulation to produce a phase and amplitude modulated transmission from the antenna elements.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: December 2, 2014
    Assignee: Foster-Miller, Inc.
    Inventors: Michael Zatman, Trevor Owen
  • Patent number: 8898057
    Abstract: Disclosed is an encoding apparatus that can efficiently encode a signal that is a broad or extra-broad band signal or the like, thereby improving the quality of a decoded signal. This encoding apparatus includes a band establishing unit (301) that generate, based on the characteristic of the input signal, band establishment information to be used for dividing the band of the input signal to establish a first band part of lower frequency side and a second band part of higher frequency side; a lower frequency encoding unit (302) for encoding, based on the band establishment information, the input signal of the first band part to generate encoded lower frequency part information; and a higher frequency encoding unit (303) for encoding, based on the band establishment information, the input signal of the second band part to generate encoded higher frequency part information.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: November 25, 2014
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventor: Tomofumi Yamanashi
  • Patent number: 8891679
    Abstract: The disclosed polar modulation transmitter circuit is configured to generate an output signal having a transmission frequency that minimizes crosstalk effects between different transmission bands (e.g., Bluetooth, GSM, UMTS, etc.). In particular, a polar modulation transceiver circuit, having an amplitude modulated (AM) signal and a phase modulated (PM) signal, comprises a digitally controlled oscillator (DCO) configured to generate a DCO signal having a DCO frequency. The DCO signal is provided to one or more frequency dividers that are configured to selectively divide the DCO signal to generate various lower frequency signals, used to select a sampling rate for a DAC operating on the AM signal and an RF carrier signal frequency, which result in an output signal having a frequency that does not interfere with other RF systems on the same IC (e.g., that falls outside of the downlink frequency of other RF systems). Other systems and methods are also disclosed.
    Type: Grant
    Filed: January 3, 2014
    Date of Patent: November 18, 2014
    Assignee: Infineon Technologies AG
    Inventors: Stefano Marsili, Giuseppe Li Puma, Stefan Van Waasen, Yanzhong Dai, Edwin Thaller
  • Patent number: 8891674
    Abstract: A digital transmission system is provided. The system includes a transmission signal generation unit which generates transmission signals by loading data to be transmitted on carrier waves; and an additional data processing unit which loads a low power signal expressing additional data on the carrier waves on which the data is loaded by the transmission signal generation unit. The system may be embodied as an orthogonal frequency division multiplexing (OFDM) system such as a Digital Video Broadcasting-Terrestrial (DVB-T) system, or a single carrier system such as a Vestigial Sideband (VSB) system.
    Type: Grant
    Filed: February 11, 2008
    Date of Patent: November 18, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Eui-jun Park, June-hee Lee, Kyo-shin Choo
  • Patent number: 8885734
    Abstract: A system (21) comprises a first circuit (23) for transmitting information to a second circuit (22). The first circuit (23) comprises a signal generator (34) arranged to generate a signal (31) for transmission to the second circuit (22). The signal (31) has a first state for causing the second circuit (22) to perform a first operation and a second state for causing the second circuit (22) to perform a second operation. The signal generator (34) comprises means to modulate the generated signal (31) during a data burst period (52) to encode data into the generated signal (31). The data burst period (52) occurs within a period in which the generated signal (31) is in the second state. The signal (31) is modulated such that the encoded data is distinguishable from the generated signal (31). In an embodiment, a data burst period (52a, 52b) comprises a plurality of data periods (54) during which the state of the signal is representative of the data encoded in the signal (31).
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: November 11, 2014
    Assignee: ST-Ericsson SA
    Inventors: Janne Peltonen, Antti Rauhala, Mika Salmi
  • Patent number: 8880002
    Abstract: A simulated radio channel is shifted with respect to a plurality of antenna elements coupled with an emulator for communicating with a device under test by using different directions for the simulated radio channel in an anechoic chamber.
    Type: Grant
    Filed: June 3, 2009
    Date of Patent: November 4, 2014
    Assignee: Elektrobit System Test Oy
    Inventors: Marko Falck, Pekka Kyösti, Petteri Heino, Jukka-Pekka Nuutinen, Jouni Saastamoinen
  • Patent number: 8867656
    Abstract: When a determination is made that communication by an SM scheme is suitable, a setting unit performs switching from a communication level by an STC scheme to the communication level by the SM scheme, between the communication level at a first level of MCS by the space-time coding scheme and the communication level at a second level of MCS by the SM scheme. When a determination is made that communication by the SM scheme is unsuitable, the setting unit performs switching from the communication level by the STC scheme to the communication level by the spatial multiplexing scheme, between the communication level at a third level of MCS, which is higher than the first level, by the space-time coding scheme and a fourth level of the modulation scheme and the coding rate, which is higher than the second level, by the SM scheme.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: October 21, 2014
    Assignee: KYOCERA Corporation
    Inventor: Takeo Miyata
  • Publication number: 20140269969
    Abstract: Systems and methods for transpositional modulation and demodulation are provided. One such method for generating a signal includes the steps of providing a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level; receiving an input signal; and outputting quarter-cycle waveforms associated with levels of the received input signal. Systems for transpositional modulation are also provided. One such system for generating a signal includes a look-up table having a plurality of quarter-cycle waveforms. Each of the quarter-cycle waveforms are associated with a respective input level, and the look-up table is configured to receive an input signal, and output to quarter-cycle waveforms associated with levels of the received input signal.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: MEDUSA SCIENTIFIC, LLC
    Inventor: RICHARD C. GERDES
  • Patent number: 8830040
    Abstract: Systems and methods are operable to communicate information to a direct current (DC) powered electronic device. An exemplary embodiment receives alternating current (AC) power with an AC information signal modulated thereon, converts the received AC power to DC power, demodulates the received AC information signal to determine information, modulates the information onto the transmitted DC power as a DC information signal, transmits the DC power with the DC information signal over a DC connector to the DC powered electronic device, detects the DC information signal on the modulated DC power at the DC powered electronic device, demodulates the DC information signal from the received DC power, and determines the information at the DC powered electronic device based upon the demodulated DC information.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: September 9, 2014
    Assignee: Eldon Technology Limited
    Inventors: David Robert Burton, Martyn Ward
  • Patent number: 8817908
    Abstract: An embodiment may include circuitry to generate and/or receive, at least in part, a signal that may include at least one waveform. The at least one waveform may include at least one portion followed by at least one other portion. The at least one portion may include a plurality of levels to be compared to data encoding levels to determine whether the plurality of levels satisfy ratios determined based at least in part upon the plurality of levels and the data encoding levels. The at least one other portion may include maximum and minimum data encoding levels to facilitate emphasis measurement. Many alternatives, variations, and modifications are possible.
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: August 26, 2014
    Assignee: Intel Corporation
    Inventor: Kent C. Lusted
  • Patent number: 8798198
    Abstract: A calibration system may be provided for calibrating wireless communications circuitry in an electronic device during manufacturing. The calibration system may include data acquisition equipment for receiving an amplitude-modulated calibration signal from the electronic device. The calibration system may include calibration computing equipment for extracting pre-distortion coefficients from the amplitude-modulated calibration signal. The calibration computing equipment may be configured to detect a bulk phase drift in the amplitude-modulated calibration signal. The calibration computing equipment may be configured to remove the bulk phase drift from the amplitude-modulated calibration signal. The wireless communications circuitry may include a power amplifier that distorts a signal generated by the wireless communications circuitry. The wireless communications circuitry may include a pre-distortion compensator for countering the distortion.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: August 5, 2014
    Assignee: Apple Inc.
    Inventor: Gary Lang Do
  • Patent number: 8792322
    Abstract: A transmitting apparatus for transmitting signals in a multi carrier system on the basis of a frame structure, each frame including at least two signalling patterns adjacent to each other in the frequency direction and at least two data patterns, the transmitting apparatus including signalling mapping means to map signalling data on frequency carriers of each of the at least two signalling patterns in a frame, each signalling pattern having the same length, data mapping means to map data on frequency carriers of the at least two data patterns in a frame, transforming means to transform the signalling patterns and the data patterns from the frequency domain into the time domain in order to generate a time domain transmission signal, and transmitting means to transmit the transmission signal. A corresponding transmitting method and a frame pattern for a multi carrier system are also provided.
    Type: Grant
    Filed: February 13, 2012
    Date of Patent: July 29, 2014
    Assignee: Sony Corporation
    Inventors: Lothar Stadelmeier, Samuel Asangbeng Atungsiri, Martin Lovell, Tamotsu Ikeda
  • Patent number: 8787263
    Abstract: In a satellite communication system, a central station receives a message including channel measurement information that is provided from a terminal and calculates a channel estimating value based on the received channel measurement information and weather data of a region corresponding to a location of the terminal. The central station determines encoding and modulation methods of data to transmit based on the calculated channel estimating value.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: July 22, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Mankyu Park, Deock Gil Oh
  • Patent number: 8787141
    Abstract: A transmitting apparatus for transmitting signals in a multi carrier system on the basis of a frame structure, each frame including at least one signalling pattern and one or more data patterns, said transmitting apparatus including frame forming means for arranging first signalling data in the at least one signalling pattern in a frame, and adapted to arrange data in the one or more data patterns in a frame, whereby the data of the one or more data patterns are arranged in data frames, each data frame comprising second signalling data and content data, transforming means for transforming the at least one signalling pattern and the one or more data patterns from the frequency domain into the time domain in order to generate a time domain transmission signal, and transmitting means for transmitting the time domain transmission signal.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: July 22, 2014
    Assignee: Sony Corporation
    Inventors: Samuel Asangbeng Atungsiri, Joerg Robert, Lothar Stadelmeier
  • Patent number: 8737534
    Abstract: A receiver having Inphase-Quadrature (I-Q) imbalance compensation and an I-Q imbalance compensation method are provided. The receiver calculates a cross-ratio parameter according to a first ideal receiving value and a first ideal conjugate receiving mirror of a first receiving signal and a second ideal receiving value and a second ideal conjugate receiving mirror of a second receiving signal. The receiver calculates an I-Q imbalance compensation parameter according to the cross-ratio parameter, the first ideal receiving value, the first ideal conjugate receiving mirror, the second ideal receiving value, the second ideal conjugate receiving mirror, the first receiving signal and the second receiving signal. The receiver compensates a third receiving signal according to the I-Q imbalance compensation parameter.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: May 27, 2014
    Assignee: Institute for Information Industry
    Inventors: Terng-Yin Hsu, Wei-Chi Lai, Shao-Ying Yeh, Tsung-Yu Tsai
  • Patent number: 8737516
    Abstract: A method and system is provided for communicating distinct data over a single frequency using on-off keying, a form of amplitude modulation, or phase changes timed to the zero crossing point of the carrier. A data signal is synchronized with the carrier by adding padding bits so that the number of bits is equal to the frequency of the carrier. The carrier is then modified by attenuating the carrier as needed once per cycle. Said carrier is then transmitted. The resulting transmitted carrier carries a number of bits equal to the transmit frequency. At the receive end, the received signal is compared to a sine wave to determine if the incoming signal is at full strength or at reduced strength, allowing for the detection of encoded digital information. In a another embodiment, the phase of the carrier is changed instead of attenuating the carrier, timed to the carrier cycles, once or twice per cycle.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: May 27, 2014
    Inventor: Nigel Iain Stuart Macrae
  • Publication number: 20140140431
    Abstract: A transmitting/receiving system may include a transmission line, a transmitter circuit configured to transmit a clock to the transmission line and to adjust an amplitude of the clock in accordance with a logic level of data, and a receiver circuit configured to receive the clock transferred to the transmission line and to recover the data through detection of the amplitude of the clock.
    Type: Application
    Filed: March 16, 2013
    Publication date: May 22, 2014
    Applicant: SK HYNIX INC.
    Inventor: Hyun-Woo LEE
  • Patent number: 8724658
    Abstract: An output control unit outputs data of bit rate A to a first header-attaching unit and data of bit rate B to a second header-attaching unit. An instructing unit instructs the first or the second header-attaching unit to attach a header of bit rate being the least bit rate to the data of bit rate A or B. The first header-attaching unit creates a header of bit rate A, including an ID of a destination ONU of the data of bit rate A and information concerning the data length, and attaches the header of bit rate A to the data of bit rate A. The second header-attaching unit creates a header of bit rate A, including an ID of the destination ONU of the data of bit rate B and information concerning the data length, and attaches the header of bit rate A to the data of bit rate B.
    Type: Grant
    Filed: May 4, 2012
    Date of Patent: May 13, 2014
    Assignee: Fujitsu Limited
    Inventor: Kazuyuki Mori
  • Patent number: 8711956
    Abstract: A communications system may include a first communications device that may include a transmitter and a modulator cooperating therewith to modulate a coded waveform using a constant phase modulation (CPM) to generate a non-linear CPM waveform, and generate a linear representation of the non-linear CPM waveform, the linear representation including a plurality of pulses. The transmitter and a modulator may further cooperate to remove at least some of the plurality of pulses to define a modified linear representation of the non-linear CPM waveform, and transmit the modified linear representation of the non-linear CPM waveform. The communications system may further include a second communications device that may include a receiver and a single pulse-matched filter linear demodulator cooperating therewith to demodulate the modified linear representation of the non-linear CPM waveform transmitted from the first communications device.
    Type: Grant
    Filed: February 7, 2011
    Date of Patent: April 29, 2014
    Assignee: Harris Corporation
    Inventor: Michael A. Wadsworth
  • Patent number: 8687646
    Abstract: The present invention discloses a method and apparatus for bit and power allocation and a communication system. The method for bit and power allocation comprises: determining a set of candidate modulation modes for sub-channels; constructing an SNR lookup table according to a predetermined target BER, the SNR lookup table containing a relationship of an SNR and the number of bits corresponding to a modulation mode in the set of candidate modulation modes at the target BER; obtaining normalized SNRs on the sub-channels; initializing the numbers of bits for the sub-channels; initializing powers for the sub-channels according to the numbers of bits for the sub-channels, the normalized SNRs on the sub-channels and the SNR lookup table; and adjusting the numbers of bits and the powers for the sub-channels in accordance with a principle of maximizing power utilization rate, to obtain the result of the bit and power allocation for the sub-channels.
    Type: Grant
    Filed: May 24, 2011
    Date of Patent: April 1, 2014
    Assignee: Fujitsu Limited
    Inventors: Huijian Zhang, Zhenning Tao
  • Patent number: 8675769
    Abstract: A method and system for optimizing symbol mapping in partial response based communications that are based on use of pulse-shaping that incorporates a predetermined amount of inter-symbol interference (ISI). Optimizing symbol mapping symbol mapping may comprise configuring optimized constellation mapping for use in mapping and/or de-mapping data communicated using the partial response pulse-shaping. In this regard, the optimized constellation mapping may be based on a reference constellation mapping that is utilized for reference modulation scheme, and the configuring comprises applying adjustments to one or more constellation points in the reference constellation mapping. The optimized constellation mapping may be configured to optimize an applicable minimum distance for one or more selected error patterns for a given spectral compression applied during partial response based communications.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: March 18, 2014
    Assignee: MagnaCom Ltd.
    Inventor: Amir Eliaz
  • Patent number: 8665985
    Abstract: A low level secondary communication signal is summed with an existing primary communication signal in a manner that prevents interference to the existing primary communication signal while providing secondary communication signal benefits such as increased data rate, range, or interference immunity. Examples are presented in which a M-QAM secondary signal is summed with either an ATC Mode S PPM reply or DPSK interrogation primary signal. Legacy Mode S transponders, TCAS, and ADS-B equipment continue to demodulate and decode the primary signal information in accordance with preexisting formats while new enhanced equipment obtains the benefits of the secondary signal.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: March 4, 2014
    Inventor: Gregory Hubert Piesinger
  • Patent number: 8665691
    Abstract: The present invention relates to a transmitting apparatus for transmitting signals in a multi carrier system on the basis of a frame structure, each frame comprising at least one signalling pattern and one or more data patterns, said transmitting apparatus comprising frame forming means adapted to arrange first signalling data in said at least one signalling pattern in a frame, and adapted to arrange data in said one or more data patterns in a frame, whereby the data of said one or more data patterns comprise content data and sorting information enabling a sorting of the content data in the correct temporal order, transforming means adapted to transform said at least one signalling pattern and said one or more data patterns from the frequency domain into the time domain in order to generate a time domain transmission signal, and transmitting means adapted to transmit said time domain transmission signal.
    Type: Grant
    Filed: January 19, 2010
    Date of Patent: March 4, 2014
    Assignee: Sony Corporation
    Inventors: Joérg Robert, Lothar Stadelmeier, Khaled Daoud
  • Patent number: 8654822
    Abstract: A link adaptation system using a Doppler frequency is provided. The link adaptation system includes: a Doppler frequency estimation unit to estimate a Doppler frequency of a signal transmitted via a wireless channel; a Signal to Noise Ratio (SNR) measurement interval determination unit to determine an SNR measurement interval of the signal transmitted via the wireless channel based on the estimated Doppler frequency; and an SNR measurement unit to measure an SNR of the signal based on the determined SNR measurement interval.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: February 18, 2014
    Assignees: Samsung Electronics Co., Ltd., Seoul National University Industry Foundation
    Inventors: Young Soo Kim, Kyung Hun Jang, In Sun Lee, Jung Woo Lee, Hyo Sun Hwang, Hyun Gi Ahn, Chan Hong Kim
  • Patent number: 8649460
    Abstract: Techniques for multi-wire encoding with an embedded clock are disclosed. In one particular exemplary embodiment, the techniques may be realized as a transmitter component. The transmitter component may comprise at least one encoder module to generate a set of symbols, each symbol being represented by a combination of signal levels on a set of wires. The transmitter component may also comprise at least one signaling module to transmit one or more of the symbols over the set of wires according to a transmit clock. The transmitter component may additionally comprise control logic to restrict transmission of first and second subsets of the set of symbols to respective first and second portions of a clock cycle of the transmit clock, such that a signal differential among at least two of the set of wires exhibits a switching behavior that has a same frequency as the transmit clock.
    Type: Grant
    Filed: June 4, 2008
    Date of Patent: February 11, 2014
    Assignee: Rambus Inc.
    Inventors: Frederick Ware, Jade Kizer
  • Patent number: 8649469
    Abstract: A method of receiving a demodulated waveform according to a protocol in which the waveform represents a block of transmitted bits comprising a first group of bits and a second group of bits, the second group of bits being a function of the first group of bits, the method comprising: sampling the demodulated waveform to recover a first group of sample values corresponding to the first group of transmitted bits and a second group of sample values corresponding to the second group of transmitted bits; assigning bit values to reliable sample values of the first group of sample values; generating a set of candidates for a block of bits corresponding to the demodulated waveform, each candidate comprising a first group of candidate bits and a second group of candidate bits, the first group of candidate bits being generated using the assigned bit values and a combination of bit values unique to that candidate in the set of candidates, and the second group of candidate bits being generated by applying the said functio
    Type: Grant
    Filed: November 2, 2009
    Date of Patent: February 11, 2014
    Assignee: Cambridge Silicon Radio Limited
    Inventors: Chunyang Yu, Andrei Popescu
  • Publication number: 20140003548
    Abstract: A wireless communication device for communicating in the near-field via active load modulation. The device including an antenna configured to receive a magnetic field, a recovery device configured to recover a clock from the magnetic field, and a multiplexer configured to receive the recovered clock and a reference clock, and to output one of the recovered clock and the reference clock based on a current operational state of the wireless communication device, The wireless communication device further including a shunt regulator configured to produce the active load modulation by modulating an impedance of the wireless communication device, a phase-locked loop (PLL) configured to receive one of the recovered clock and the reference clock and to utilize the received clock to control the active load modulation, and a driver configured to contribute to the active load modulation by adjusting an amplitude of a voltage across the antenna.
    Type: Application
    Filed: June 28, 2012
    Publication date: January 2, 2014
    Applicant: Broadcom Corporation
    Inventor: Alastair LEFLEY
  • Patent number: 8619911
    Abstract: A system and method for decoding quadrature signals includes a quadrature signal generator, a quadrature signal decoder, a key matrix and a driver. The quadrature signal generator generates quadrature signals on rotation. The quadrature signal decoder is configured to convert the quadrature signals into non-overlapping signals. The key matrix is configured to receive the non-overlapping signals. The driver is configured to scan the key matrix to decode the non-overlapping signals to generate an event update corresponding to a direction of rotation of the quadrature signal generator.
    Type: Grant
    Filed: March 8, 2010
    Date of Patent: December 31, 2013
    Assignee: STMicroelectronics International N.V.
    Inventors: Ranajay Mallik, Munish Mangal
  • Patent number: 8605830
    Abstract: Systems and methods and memory media for performing modulation type detection. An attempt is made to estimate an underlying symbol rate of a received signal. The received signal is compensated for carrier frequency offset. Two candidates for symbol timing offset are estimated from the compensated signal. The compensated signal is downsampled using each offset candidate. A set of features is computed for each of the two downsampled signals. For each downsampled signal, the set of features is compared to a corresponding set of thresholds to obtain a corresponding set of comparison results. The two sets of comparison results are used to determine the modulation type of the received signal. A second method for estimating symbol rate may be performed if the modulation type is found to be FSK.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: December 10, 2013
    Assignee: National Instruments Corporation
    Inventors: Ankit Sethi, Baijayanta Ray
  • Publication number: 20130315340
    Abstract: A communications network (20) comprises a network coding node (24) and a network decoding node (26). A method of operating a communications network (20) comprises, at the network coding node (24), performing multi-domain network coding upon a first signal and a second signal to obtain a network coded signal. The first signal is modulated by a first modulation scheme and the second signal is modulated by a second modulation scheme. At least one of the first signal and the second signal includes information in a phase domain and information in an amplitude domain. The method further comprises transmitting the network coded signal over a link to a receiver (26) and performing multi-domain network decoding of the network coded signal as detected at the receiver (26) to obtain the second signal, the receiver knowing and using the first signal for the multi-domain network decoding.
    Type: Application
    Filed: May 8, 2013
    Publication date: November 28, 2013
    Applicant: Telefonaktiebolaget L_M Ericsson (publ)
    Inventor: Jawad MANSSOUR
  • Patent number: 8594233
    Abstract: A communications device may include In-phase (I) power amplifiers configured to generate I amplified signals, Quadrature (Q) power amplifiers configured to generate Q amplified signals, an I controller coupled to the I power amplifiers and configured to selectively enable some of the I power amplifiers, and a Q controller coupled to the Q power amplifiers and configured to selectively enable some of the Q power amplifiers. The communications device may also include a power combiner configured to combine the I amplified signals and the Q amplified signals in a combined amplified signal, and an antenna coupled to the power combiner.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: November 26, 2013
    Assignee: BlackBerry Limited
    Inventor: Khurram Muhammad
  • Patent number: 8588330
    Abstract: A communications device may include In-phase (I) power amplifiers configured to respectively generate I amplified signals, Quadrature (Q) power amplifiers configured to respectively generate Q amplified signals, I antennas respectively coupled to the I power amplifiers, and Q antennas respectively coupled to the Q power amplifiers. The communications device may also include an I controller coupled to the I power amplifiers and configured to selectively enable some of the I power amplifiers, and a Q controller coupled to the Q power amplifiers and configured to selectively enable some of the Q power amplifiers.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: November 19, 2013
    Assignee: BlackBerry Limited
    Inventor: Khurram Muhammad