With Phase Or Frequency Shift Keying Patents (Class 375/269)
  • Patent number: 11418157
    Abstract: A gain control circuit utilized in a transmitter is disclosed. The transmitter is configured to amplify an input signal according to a gain via a digital amplifier, an analog amplifier and a power amplifier, to generate an output signal. The gain control circuit includes a correction unit configured to calculate a correction power according to an elapsed time since a current packet transmission duration of the transmitter is completed. The gain control circuit adjusts the gain according to the correction power, a transmitter signal strength indication of the input signal and an environment temperature of the transmitter.
    Type: Grant
    Filed: June 3, 2021
    Date of Patent: August 16, 2022
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Beng-Meng Chen, Chien-Jung Huang, Jhih-Yuan Ke
  • Patent number: 11184200
    Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for modulating and demodulating transpositional modulated (TM) signals. One aspect features a method of modulating a carrier signal that include the actions of generating a TM signal by generating a sinusoidal signal, and modulating the sinusoidal signal based on a data signal to provide the TM signal. Inserting the TM signal into a carrier signal to provide a TM modulated carrier signal. Modulating the TM modulated carrier signal with a non-TM signal to provide a combined signal. Transmitting the combined signal.
    Type: Grant
    Filed: September 17, 2019
    Date of Patent: November 23, 2021
    Assignee: TM IP HOLDINGS, LLC
    Inventors: Harvey C. Woodsum, Richard C. Gerdes
  • Patent number: 11159273
    Abstract: Circuitry configured to map data blocks of input bits of a first input bit stream onto first mapping symbols distributed according to a first probability distribution and represented by first signal points, analyze the probability of occurrence of the first signal points representing the first mapping symbols and/or earlier final mapping symbols, determine a second probability distribution to be applied for mapping second input bits of a second input bit stream onto second mapping symbols, said second probability distribution determined based on the analyzed probability of occurrence to obtain a desired final probability distribution of final mapping symbols, map data blocks of input bits of a second input bit stream onto second mapping symbols, wherein said second mapping symbols are distributed according to said second probability distribution and represented by second signal points, and combine the first mapping symbols and the second mapping symbols into the final mapping symbols.
    Type: Grant
    Filed: August 17, 2018
    Date of Patent: October 26, 2021
    Assignee: SONY CORPORATION
    Inventors: Thomas Handte, Reka Inovan
  • Patent number: 10902149
    Abstract: Methods, systems, apparatuses, and computer-readable storage medium are described herein for remotely analyzing testing results based on LDP-based data obtained from client devices in order to determine an effect of a software application with respect to its features and/or the population in which the application is tested. The analysis is based on a series of statistical computations for conducting hypothesis tests to compare population means, while ensuring LDP for each user. For example, an LDP scheme is used on the client-side that privatizes a measured value corresponding to a usage of a resource of the client. A data collector receives the privatized data from two sets of populations. Each population's clients have a software application that may differ in terms of features or user group. The privatized data received from each population is analyzed to determine an effect of the difference between the software applications of the different populations.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: January 26, 2021
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Bolin Ding, Harsha Prasad Nori, Paul Luo Li, Joshua Stanley Allen
  • Patent number: 10707981
    Abstract: An apparatus and method for generating a broadcast signal frame using enhanced layer dummy values are disclosed. An apparatus for generating broadcast signal frame according to an embodiment of the present invention includes a combiner configured to generate a multiplexed signal by combining a core layer signal and an enhanced layer signal; a power normalizer configured to reduce the power of the multiplexed signal to a power level corresponding to the core layer signal; a time interleaver configured to generate a time-interleaved signal by performing interleaving that is applied to both the core layer signal and the enhanced layer signal; and a frame builder configured to generate a broadcast signal frame including a preamble for signaling time interleaver information corresponding to the time interleaver, the time interleaver uses one of time interleaver groups, and enhanced layer data corresponding to the one of the time interleaver groups include dummy values.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: July 7, 2020
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung-Ik Park, Sun-Hyoung Kwon, Jae-Young Lee, Heung-Mook Kim, Nam-Ho Hur
  • Patent number: 10574393
    Abstract: The present disclosure describes methods and apparatuses for phase-based cyclic redundancy check (CRC) verification for wireless communication. In some aspects, a soft phase value and a sliced phase value are received for a symbol of a data packet, the data packet received via a wireless interface. An error measurement is determined for the symbol based on the soft phase value and the sliced phase value. The error measurement for the symbol is then compared to an error measurement threshold for detecting symbol-level errors in the data packet. Based on the error measurement exceeding an error measurement threshold, a bit error can be detected in the data packet, which may have passed CRC. By detecting the bit error despite a CRC pass, the bit error can be indicated to higher-level entity of the wireless interface. This can be effective to prevent the bit error from impairing operation of the higher-level entity.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: February 25, 2020
    Assignee: NXP USA, Inc.
    Inventors: Vijay Ganwani, Ankit Sethi, Sudhir Srinivasa, Sih-Yu Lin, Yui Lin
  • Patent number: 10361799
    Abstract: An apparatus and method for generating a broadcast signal frame using enhanced layer dummy values are disclosed. An apparatus for generating broadcast signal frame according to an embodiment of the present invention includes a combiner configured to generate a multiplexed signal by combining a core layer signal and an enhanced layer signal; a power normalizer configured to reduce the power of the multiplexed signal to a power level corresponding to the core layer signal; a time interleaver configured to generate a time-interleaved signal by performing interleaving that is applied to both the core layer signal and the enhanced layer signal; and a frame builder configured to generate a broadcast signal frame including a preamble for signaling time interleaver information corresponding to the time interleaver, the time interleaver uses one of time interleaver groups, and enhanced layer data corresponding to the one of the time interleaver groups include dummy values.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: July 23, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sung-Ik Park, Sun-Hyoung Kwon, Jae-Young Lee, Heung-Mook Kim, Nam-Ho Hur
  • Patent number: 10338873
    Abstract: Examples disclosed herein relate to a computing device. In one aspect, the computing device may include a housing including a first point and a second point spatially separated from each other, a first and second wireless communications modules, and a controller. A first waveguide may couple the first point to an input of the first wireless communications module, where an output of the first wireless communications module may be coupled to an input of the controller. A second waveguide may couple the second point to an output of the second communications module, where an input of the second communications module may be coupled to an output of the controller.
    Type: Grant
    Filed: February 27, 2015
    Date of Patent: July 2, 2019
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Isaac Lagnado
  • Patent number: 10225117
    Abstract: The present disclosure relates to methods for communicating data in a wireless communication system, especially a method, performed in a wireless device, for transmitting data from the wireless device to a wireless network node in OFDMA system having multiple resource units. The method comprises obtaining instructions to use at least one of the resource units for data transmission, receiving information regarding a set of allowed combinations of transmission parameters to use when modulating signals, modulating signals from the wireless device based on the combination of the received transmission parameters to create signals having constant amplitude and/or continuous phase in the time domain using a modulation scheme other than Orthogonal Frequency-Division Multiplexing, OFDM, and transmitting the modulated signals in the frequency ranges defined by the used at least one of the resource units.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: March 5, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Miguel Lopez, Leif Wilhelmsson
  • Patent number: 9984527
    Abstract: Disclosed are systems, devices and methods for providing solar lighting and power to a customer by using pay-as-you-go (PAYG) technology. The PAYG technology allows a customer to make incremental payments for a solar energy system that includes a lighting unit. The payments can be made through a smartphone. A cable is used to connect an audio jack of the smartphone and a PV power jack of the lighting unit. Analog AC signals including data about activation, payment, usage and status are transmitted over the cable between the service provider and lighting unit, through a smartphone. The power jack of the lighting unit is also used to connect to a solar panel of a charging unit and a battery of the lighting unit.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: May 29, 2018
    Assignee: Angaza Design, Inc.
    Inventors: Lesley Silverthorn Marincola, Bryan Silverthorn, Victoria Arch, Lee Silverthorn, Joshua Milburn, William Tsai, Eric Thorne
  • Patent number: 9960819
    Abstract: A method for inductively coupled communication is described. The method includes determining an operational mode for inductively coupled communication. The method also includes performing the operational mode by combining a transmit power amplifier (PA) output replica and a PA output copy at a signal combining block of a receiver. The PA output replica reflects effects of channel properties. The PA output copy is unaffected by the channel properties.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: May 1, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Paul Butler, Magnus Wiklund
  • Patent number: 9906388
    Abstract: A method and an apparatus for receiving broadcast signals thereof are disclosed. The apparatus for receiving broadcast signals, the apparatus comprises a receiver to receive the broadcast signals, a demodulator to demodulate the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplex) scheme, a frame parser to parse a signal frame from the demodulated broadcast signals, a time deinterleaver to time deinterleave data in the parsed signal frame and a decoder to decode the time deinterleaved data.
    Type: Grant
    Filed: January 9, 2017
    Date of Patent: February 27, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Jongseob Baek, Woosuk Ko, Seoyoung Back, Sungryong Hong
  • Patent number: 9860392
    Abstract: In some embodiments, a power converter circuit includes a first power converter coupled between a direct-current (DC) node and a first pair of output nodes. The first power converter may be configured to provide a first power signal having a first phase to the first pair of output nodes. The power converter circuit may also include a second power converter coupled between the DC node and a second pair of output nodes. The second power converter may be configured to provide a second power signal having a second phase to the second pair of output nodes. The second phase and the first phase may differ by an odd multiple of ninety degrees.
    Type: Grant
    Filed: June 5, 2015
    Date of Patent: January 2, 2018
    Assignee: Silicon Laboratories Inc.
    Inventors: Sean Anthony Lofthouse, Bassem ElAzzami
  • Patent number: 9806777
    Abstract: A method for a communication device with at least one antenna array composed of a plurality of antenna elements, each of the plurality of antenna elements coupled to a corresponding phase shifter of a plurality of phase shifters. The method includes determining an optimized beam forming weight for each of the plurality of phase shifters by maximizing an array gain of the antenna array for each steering angle of a plurality of pre-defined steering angles to generate a set of optimized beam forming weights for each steering angle; and configuring the plurality of phase shifters with the set of optimized beam forming weights for a selected steering angle to perform beam forming in direction of the selected steering angle.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: October 31, 2017
    Assignee: INTEL CORPORATION
    Inventors: Roya Doostnejad, Wook Bong Lee, Oner Orhan
  • Patent number: 9749589
    Abstract: A method for determining an identifier of a conditional access card used in a conditional access system, in which the conditional access card autonomously modulates the timing of data packets sent by the conditional access card, according to a sequence that depends on the identifier of the card. The sequence is generated by a predefined non-linear function stored on the conditional access card, and the predefined non-linear function depends on both the identifier of the conditional access card and a non-linear random sequence that is known to the conditional access card and a monitoring station that receives transmissions from the conditional access card.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: August 29, 2017
    Inventor: Oliver Koemmerling
  • Patent number: 9621411
    Abstract: Data of a utility node that is unreliably heard may be relayed through another utility node. In some examples, utility nodes of a star network may attempt to transmit data to a collector, a repeater, a relay, a router, or a mobile device. When it is determined that a utility node is unable to reliably transmit data, a relay relationship may be established so that data of the unreliable utility node is relayed through the network.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 11, 2017
    Assignee: Itron, Inc.
    Inventors: Christopher Lloyd Osterloh, Scott L. Cumeralto, Keith Wayne Barnes, Merv Grindahl
  • Patent number: 9395189
    Abstract: In one implementation, a method may comprise: obtaining a digital map of an indoor region that identifies boundaries between subsections within the indoor region; and approximating locations of walls separating rooms within at least one of the subsections based, at least in part, on locations of feature labels provided in the digital map.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: July 19, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Vinay Sridhara, Hui Chao, Saumitra Mohan Das, Rajarshi Gupta
  • Patent number: 9231746
    Abstract: The present invention refers to a method and a transmitter element (35) for transmitting channel information (CI) for link adaptation of a radio channel (33) in a wireless network (11). In order to allow for reliable and efficient transfer of the channel information (CI) and to adapt the detection probability to the importance of the CI as well as to the channel stability, it is suggested that the method comprises encoding (19) the channel information (CI) using multi-level coding, said multi-level coding (19) comprising combining multiple bit sequences (c1, c2, . . . , cn, d), each bit sequence (c1, c2, . . . , cn, d) corresponding to a coding level (1, . . . , n) of said multilevel coding (19) and assigning (37) one of said coding levels (1, . . . , n) to at least a part (ci1, ci2) of the channel information (CI) such that at least a part (ci1, ci2) of the channel information (CI) corresponds to the bit sequence (c1, c2, . . . , cn) of that coding level (1, . . . , n).
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: January 5, 2016
    Assignee: Alcatel Lucent
    Inventors: Stefan Valentin, Thorsten Wild, Andre F. D. Santos
  • Patent number: 9210468
    Abstract: A system and method for effectively implementing a stroboscopic visual effect with a television device includes a strobe engine that analyzes video data to create a sequence of stroboscopic images based upon motion information from the video data. The television utilizes a display manager to present the stroboscopic images and the video data on a display device during a strobe display mode. A processor device of the television typically controls the operations of the strobe engine and the display manager to implement the stroboscopic visual effect.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: December 8, 2015
    Assignee: Sony Corporation
    Inventors: Ming-Chang Liu, Kuang-Man Huang, Chuen-Chien Lee
  • Patent number: 9189520
    Abstract: A method and system to generate cardinality estimates for at least one query execution plan for a query using a histogram, the cardinality estimation being constrained by a q-error that is a factor by which the estimate deviates, at most, from a true value of the cardinality and a threshold value which the cardinality does not exceed; use the cardinality estimation to determine an optimal query plan for executing the query; and produce an output of the optimal query plan.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: November 17, 2015
    Assignee: SAP SE
    Inventors: Norman May, Guido Moerkotte, Alexander Boehm
  • 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: 9008199
    Abstract: A MIMO transmitter including an interleaving system for parsing encoded bits to a plurality of spatial streams and a plurality of interleavers to interleave bits for spatial streams such that at least a first spatial stream uses a first stream interleaver that interleaves with a pattern distinct from a second stream interleaver interleaving for a second spatial stream.
    Type: Grant
    Filed: June 26, 2009
    Date of Patent: April 14, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: D. J. Richard van Nee
  • Patent number: 8964902
    Abstract: The present invention provides a method and an apparatus for eliminating direct current offset.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: February 24, 2015
    Assignee: ST-Ericsson Semiconductor (Beijing) Co., Ltd
    Inventors: Jiangshan Chen, Zhenguo Ma, Liyong Yin
  • Patent number: 8942326
    Abstract: The disclosure provides a channel decoding method and a tail biting convolutional decoder. The method comprises: the tail biting convolutional decoder performs add-compare-select processing on metric values of 2N states according to input data to be decoded and N zeros input after the data to obtain final cumulative metric values of the 2N states, and stores selection result of add-compare-select processing, wherein N is the constraint length of tail biting convolutional coding; the tail biting convolutional decoder starts to backtrack from one state of the 2N states according to the selection result to obtain intermediate decoding result after the add-compare-select processing is finished; the tail biting convolutional decoder outputs the bits except the last N bits of the intermediate decoding result as decoded result of the data to be decoded. The tail biting convolutional decoder comprises an add-compare-select module, a backtracking module and an outputting module.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: January 27, 2015
    Assignee: ZTE Corporation
    Inventor: Fanping Du
  • Patent number: 8942327
    Abstract: The present invention employs hierarchical modulation to simultaneously transmit information on different modulation layers using a carrier RF signal. Initially, first data to be transmitted is assigned to a first modulation layer and second data is assigned to a second modulation layer. In one embodiment of the present invention, the first and second data are assigned based on reliability criteria. The first and second modulation layers are hierarchical modulation layers of the carrier RF signal. Once assigned, the first data is transmitted using the first modulation layer of the carrier RF signal and the second data is transmitted using the second modulation layer of the carrier RF signal. In one embodiment of the present invention, information may be transmitted to one end user using one modulation layer, and information may be transmitted to a different end user using a different modulation layer.
    Type: Grant
    Filed: October 11, 2012
    Date of Patent: January 27, 2015
    Assignee: Apple Inc.
    Inventors: Ming Jia, Jianglei Ma, Peiying Zhu, Wen Tong, Curt Dodd
  • Patent number: 8903091
    Abstract: A secure optical communication system and method are disclosed. Short optical pulses are first modulated with data, then dispersed in time so that they spread out over multiple bit periods, then the desired code is applied to the dispersed pulses. The encoding may include frequency shifts or phase shifts or other. The dispersed optical symbols overlap in time so an applied code chip thus acts on multiple symbols simultaneously. There are generally multiple code chips per dispersed symbol. The coding device does not need to be synchronized to the data rate. Multiple wavelength division multiplexed channels may be encoded simultaneously. The signal propagates to a decoder that is synchronized with encoder to apply a complementary code thereby canceling out the effect of the encoder. The encoder and decoder can be realized by varying the wavelength of an optical pump to a parametric amplifier, allowing for a wide-band frequency shift.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: December 2, 2014
    Assignee: Nucript LLC
    Inventor: Gregory S. Kanter
  • Patent number: 8891661
    Abstract: Techniques for data transmission using high-order modulation are provided. According to one aspect, parameters of a transmission link are determined, and a multilevel coding scheme and a high-order modulation signal constellation are selected on the basis of the determined parameters. An information indicating the selected multilevel coding scheme and high-order modulation signal constellation and data symbols encoded according to the selected multilevel coding scheme and high-order modulation signal constellation are transmitted. In other aspects, QPSK data symbols are embedded between M-QAM data symbols or M-PSK data symbols with M>4. The QPSK data symbols may be used to improve the efficiency of the decoding process.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: November 18, 2014
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Udo Seier, Khaled Fazel
  • Publication number: 20140286453
    Abstract: A satellite communication system using hierarchical modulation to transmit a plurality of modulated signals to sub-regions within a region. Each modulated signal includes high priority content and low priority content. The system includes a satellite equipped with a plurality of satellite transmitters coupled to a plurality of antenna elements, e.g. a phased array of antenna elements. The antenna elements are utilized selectively to direct a modulated signal from a satellite transmitter to a distinct sub-region. The satellite transmitters and antenna also cooperate to broadcast the high-priority content to the region such that a ground receiver traveling from a first sub-region to an adjacent second sub-region adjacent will not experience a loss of high-priority content. First low-priority content of a first modulated signal directed to the first sub-region is independent of second low-priority content of a second modulated signal directed to the second sub-region.
    Type: Application
    Filed: March 19, 2013
    Publication date: September 25, 2014
    Applicant: DELPHI TECHNOLOGIES, INC.
    Inventors: GLENN A. WALKER, ERIC A. DIBIASO
  • 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: 8837624
    Abstract: Processing data presented in the form of a vector representation involves representing direction of the vector with incremental accuracy by using a set of vector codebooks of decreasing dimensions per accuracy increment.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: September 16, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Filippo Tosato
  • Publication number: 20140211880
    Abstract: A method for generating a decoding metric in a wireless communication system includes receiving an FQAM symbol and determining transmission probabilities of FQAM symbol candidates from a received value of the FQAM symbol, wherein the transmission probabilities of the FQAM symbol candidates are determined by multiplying a probability that a QAM symbol included in the FQAM symbol is mapped to each of candidate values in one frequency and a probability that a signal is not transmitted in the other at least one frequency. An apparatus in a wireless communication system for supporting FQAM, the apparatus comprising an RF processing unit configured to receive an FQAM symbol, and a modem configured to determine transmission probabilities of FQAM symbol candidates from a received value of the FQAM symbol.
    Type: Application
    Filed: January 28, 2014
    Publication date: July 31, 2014
    Applicant: Samsung Electronics Co., Ltd
    Inventors: Min Sagong, Chi-Woo Lim, Sung-Nam Hong, Hyun-Kyu Yu, Kyung-Whoon Cheun
  • Patent number: 8774317
    Abstract: A system and method for a radio controlled clock receiver adapted to extract timing and time information from a phase modulated signal. The official time signal is broadcast from a central location using a modified modulation scheme, which adds phase modulation over the legacy amplitude modulation, such as the legacy WWVB pulse width modulated (PWM)/amplitude shift keying (ASK) modulation, thereby allowing for improved performance. The information modulated onto the phase contains a known synchronization sequence having good autocorrelation properties, error-correcting coding for the time information and notifications of daylight-saving-time (DST) transitions that are provided months in advance. The modulation scheme is based on a form of phase modulation, such as binary-phase-shift-keying (BPSK) or phase reversal keying (PRK).
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: July 8, 2014
    Assignee: Everset Technologies, Inc.
    Inventor: Oren E. Eliezer
  • Patent number: 8755412
    Abstract: A cross-layer design architecture is provided for logical superposition coded (SPC) modulation for last-hop wireless data, aiming to overcome the effects of multi-user channel diversity in wireless video multicast. The proposed approach generates a logical SPC modulated signal by mapping successively refined information bits onto layered modulation through dynamic energy allocation and phase keying assignment, which mimics the superposition process for multiple modulated signals in convention hardware-based SPC modulation. At the receiver end, the received logical SPC signal is decoded by implementing a software-based approach on common demodulators without going through the signal-interference cancellation (SIC) process that is necessary in the conventional approach.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: June 17, 2014
    Inventors: Pin-Han Ho, Pei Man James She
  • Patent number: 8755447
    Abstract: A communications system, e.g., a wireless microphone, incorporates a quadrature modulator system to reduce power consumption with respect to traditional approaches and is general in nature to support any two-dimensional digital technique. The quadrature modulator system comprises different subsystems, including a digital-analog transformation circuit, a baseband filter, and a quadrature modulator. The digital-analog transformation circuit converts discrete time samples to a continuous time signal, and further includes an oversampling noise-shaping modulator such as a sigma-delta modulator. The baseband filter then removes out-of-band energy including sampling images and quantization noise. Some of the circuit components may comprise discrete devices that may result in a reduction of power consumption for the quadrature modulator system. Alternatively, some or all of the circuit components may be incorporated in a single electronic device.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: June 17, 2014
    Assignee: Shure Acquisition Holdings, Inc.
    Inventors: Michael Joseph Goodson, Thomas J. Kundmann, Jeffrey Arthur Meunier
  • Patent number: 8744082
    Abstract: A system and method for securing wireless communications are provided. A method for secure communications by a first user includes estimating a channel between the first user and a second user based on a pilot signal transmitted by the second user, determining a first threshold and a second threshold based on the estimate of channel, selecting a first subset of channel estimates, signaling the first subset of channel estimates to the second user, receiving a second subset of channel estimates from the second user, for each channel estimate in the second subset of channel estimates, quantizing the channel estimate based on a relationship between a gain of the channel estimate and the first threshold and the second threshold, generating a first secret key based on quantized channel estimates, verifying that the first secret key matches a second secret key generated by the second user, and transmitting information to the second user.
    Type: Grant
    Filed: November 3, 2010
    Date of Patent: June 3, 2014
    Assignee: Futurewei Technologies, Inc.
    Inventors: Hung D. Ly, Yufei Blankenship, Tie Liu
  • 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: 20140140432
    Abstract: A method of compensating phase error of a received signal is disclosed. The signal comprises a symbol set comprising a plurality of symbols of a first type having an N-Quadrature Amplitude Modulation, N-QAM, signal configuration, where N is an integer larger than 4, and at least one symbol of a second type having an Amplitude and Phase-Shift Keying, A-PSK, signal configuration, wherein both the symbols of the first type and of the second type carries data and wherein the symbols of the second type also are arranged as pilot symbols for determination of phase rotation determination. A receiver and transmitter, as well as a communication system, employing the symbol set are disclosed.
    Type: Application
    Filed: July 8, 2011
    Publication date: May 22, 2014
    Applicant: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Dan Weinholt, Carmelo Decanis
  • Patent number: 8724730
    Abstract: Method, arrangement and computer program product in a base station for transmitting two USF values and two data blocks to a terminal. The base station and the terminal are comprised within a wireless communication network. The two USF values are to be sent across the first data block and the second data block. The first data block and first parts of the two USF values are modulated with a first modulation technique and the second data block and second parts of the two USF values are modulated with a second modulation technique. The modulated data blocks and USF parts are transmitted to the terminal. Further, a method, an arrangement and a computer program product in a terminal for receiving USF values and data blocks from a base station are described. In addition, a method, an arrangement and a computer program product in a control node are described.
    Type: Grant
    Filed: February 9, 2009
    Date of Patent: May 13, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Marten Sundberg, Hakan Axelsson, Stefan Eriksson, Anders Malm
  • Publication number: 20140093007
    Abstract: A method for communication by means of a transformer, which has at least a primary coil and a secondary coil, which are parts of an oscillatory circuit, wherein the oscillatory circuit is supplied on the primary side with an exciter frequency. For transmission of a signal from the secondary side to the primary side, the inductance of the secondary coil is modulated. A corresponding apparatus for performing the method is likewise provided.
    Type: Application
    Filed: April 17, 2012
    Publication date: April 3, 2014
    Applicant: Endress + Hauser GmbH + Co. KG
    Inventors: Alexander Muller, Maartin Urban
  • Patent number: 8674812
    Abstract: In a communication system including a RFID tag, which has a function to record information and a function to carry out wireless communication with an external device and is capable of transmission with using both FM modulation and AM modulation, and a reader/writer for writing and reading information onto and from the RFID tag via wireless communication, a transmission to transmit information from the RFID tag to the reader/writer is carried out with using one of the FM modulation and the AM modulation at the RFID tag. If the reader/writer fails to decode a signal transmitted with using the one of the FM modulation and the AM modulation, transmission with respect to the information is carried out with using the other of the FM modulation and the AM modulation at the RFID tag. In this manner, reading error of data sent from the RFID tag is prevented.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: March 18, 2014
    Assignee: Riso Kagaku Corporation
    Inventor: Takahiro Fushimi
  • Publication number: 20140072072
    Abstract: This invention uses one or more cancellation modules to eliminate the transmitter leakage at the output of the receive antenna and prior the receiver circuitry so that the received signals can be analyzed without degradation in quality due to simultaneous operation of the transmitter and receiver. Each cancellation circuit could be limited to only 30-50 dB of rejection due to component mismatches and other circuit non-idealities. To obtain further cancellation, more than one cancellation circuit can be applied after the first low noise amplifier. The output of the low noise amplifier can be repeatedly mixed with additional cancellation signals “n” number of times such that the “n” low noise amplifier is mixed with the “nth” cancellation signal. For each additional cancellation signal added a 20-30 dB reduction in noise may be achieved such that cascading three or four cancellation signals from cancellation modules may produce a 150 dB gain.
    Type: Application
    Filed: November 18, 2013
    Publication date: March 13, 2014
    Applicant: ULTRAWAVE LABS, INC.
    Inventors: Aly Mamdouh Ismail, Francis Carr, Sai Kwok
  • Patent number: 8670505
    Abstract: A receiver system for early detection of a segment type of an input signal based on BPSK and DBPSK modulated carriers is provided. The receiver system includes a tuner that converts the input signal into an intermediate frequency (IF) signal, a signal conditioning module that converts the IF signal into a baseband signal, a Frequency Domain Synchronization (FDS) block that detects the segment type of the input signal based on a carrier powers, a Transmission and Multiplexing Configuration Control (TMCC) decode block that performs a decoding operation on the received signal, a channel estimation block that estimates a channel and obtains a channel information. The TMCC decode block uses the channel information obtained from channel estimation block to correct a fast-frequency selective fading on the received signal before the decoding operation.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: March 11, 2014
    Inventors: Subrahmanya Kondageri Shankaraiah, Abhijeet B Magadum
  • Patent number: 8660210
    Abstract: Systems and methodologies are described that facilitate code rate and modulation order dependent selection of a suitable demodulator for a received data packet. According to various aspects, systems and/or methods are described that enable selection of an optimal demodulation scheme such that signal receiver complexity is not increased and optimal decoding throughput performance is achieved.
    Type: Grant
    Filed: January 22, 2007
    Date of Patent: February 25, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Byoung-Hoon Kim
  • Patent number: 8649743
    Abstract: A transmitter (50) includes a nonlinear predistorter (58) having two instances of an inverting transform (106, 106?) that may be implemented in a look-up table (122) and that implements a transform which is the inverse of an average terms component (96) of a nonlinear transform model (94) for an amplifier (70). The look-up table (122) may be updated using a continuous process control loop that avoids Cartesian to polar coordinate conversions. One of the two instances of the inverting transform (106) is cascaded with a non-inversing transform (108) within a residual cancellation section (110) of the predistorter (58). The non-inversing transform (108) implements a transform which is an estimate of a deviation terms component (98) of the nonlinear transform model (94). The residual cancellation section (110) produces a weak signal that replaces an unwanted residual term in an amplified communication signal (76) with a much weaker residual term.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: February 11, 2014
    Assignee: CrestCom, Inc.
    Inventors: Ronald Duane McCallister, Eric M. Brombaugh
  • Publication number: 20140029690
    Abstract: A local oscillation generator includes an oscillation circuit, a frequency multiplication circuit, a mixer, and a frequency divider. The oscillation circuit provides a fundamental oscillation signal. The frequency multiplication circuit provides a first oscillation signal according to the fundamental oscillation signal. The mixer provides a mixed oscillation signal according to mixing of the fundamental oscillation signal and the first oscillation signal. The frequency divider frequency divides the mixed oscillation signal so that the local oscillation generator accordingly provides a local oscillation signal.
    Type: Application
    Filed: July 12, 2013
    Publication date: January 30, 2014
    Inventors: Keng-Meng Chang, Yao-Chi Wang
  • 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
  • Patent number: 8599939
    Abstract: A data transmission method is disclosed, and the method comprises: encoding binary data to be transmitted with encoding principle as follows: encoding binary data x1 in the manner of no jumping at middle phase; encoding binary data x2 in the manner of jumping at middle phase; and after encoding two binary data x1 consecutively with high level of no jumping at middle phase, encoding the immediate following binary data x1 with low level of no jumping at middle phase; encoding binary data x1 with high level of no jumping at middle phase, wherein the binary data x1 follows binary data x1 encoded by using low level of no jumping at middle phase; and encoding binary data x1 immediately following binary data x2 by using high level of no jumping at middle phase; modulating the encoded data; and transmitting the modulated signal.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: December 3, 2013
    Assignee: ZTE Corporation
    Inventors: Chaoyang Liu, Yibiao Fu, Yanming Li
  • Patent number: 8565284
    Abstract: A spread spectrum clock signal generator and an accompanying method provide a spread spectrum clock signal of a reduced electromagnetic interference. The spread spectrum clock signal generator includes (a) a state machine, which maintains a current state of the spread spectrum clock signal generator, receives as input value a next state of the spread spectrum clock signal generator and generates a clock phase selection signal based on the current and next states; (b) a random number generator for generating the next state; and (c) a waveform generation circuit for generating a spread spectrum clock signal based on the clock phase selection signal.
    Type: Grant
    Filed: August 13, 2007
    Date of Patent: October 22, 2013
    Assignee: Intersil Americas Inc.
    Inventors: Paul D. Ta, Wei Wang, Alvin Wang, Peter D. Bradshaw
  • Patent number: 8537766
    Abstract: The prevent invention provides a method for performing channel estimation and detection in a Multiple-Input-Multiple-Output (MIMO) system, including: generating a demodulation reference signal, DM-RS, pattern for an extended cyclic prefix (CP); and estimating and detecting channel performance based on the generated DM-RS signal pattern. The DM-RS pattern supports from rank 1 to rank 8 patterns for 8 layer transmission. A transmitter, a receiver and a system thereof are also provided. The solution of the present invention improves channel estimation accuracy, saves channel estimation implementation and implementation complexity at terminals.
    Type: Grant
    Filed: January 9, 2011
    Date of Patent: September 17, 2013
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Yang Hu, David Astely, Xinghua Song, Jianfeng Wang
  • Patent number: 8503573
    Abstract: Disclosed is a bits-to-symbol mapping method of 4+12+16 amplitude phase shift keying (APSK) having excellent performance against the non-linearity of a high power amplifier. According to the present invention A bits-to-symbol mapping method of 4+12+16 APSK modulation, comprising: representing 32 symbols of the 4+12+16 APSK modulation by a polar coordinate and arranging the 32 symbols by a size of ? while giving priority to a symbol having a small signal size when the size of ? of two or more symbols are same; grouping the arranged 32 symbols into 4 groups according to quadrant regions where the symbols are located; and allocating bits so that the same bits are allocated to the symbols belonging to the same region for each region with respect to each of the first to fifth bits of the symbols grouped into four regions.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: August 6, 2013
    Assignees: Electronics and Telecommunications Research Institute, Industry-University Cooperation Foundation Hanyang University
    Inventors: Dae Ig Chang, Dongweon Yoon, Jaeyoon Lee