Frequency Shift Keying Patents (Class 375/272)
  • Patent number: 9559832
    Abstract: Systems and methods for synchronizing a power line communication system including a power line and one or more devices communicatively coupled to the power line. A mains frequency of the power line is estimated at the devices, and corresponding local frequencies of the devices are adjusted based on the corresponding estimated mains frequency. Data signals are transmitted from or received by the devices based on the adjusted local frequencies.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: January 31, 2017
    Assignee: Semtech EV, Inc.
    Inventor: Farrokh Farrokhi
  • Patent number: 9369178
    Abstract: A PLC/power-supply hybrid device includes a power supply circuit. The power supply circuit includes a switching part for chopping a voltage of a voltage input terminal side, and a control circuit that controls the chopping by controlling switching of the switching part. The control circuit is operated in a normal mode and a transmission mode. The normal mode is a mode in which voltage conversion is performed. The transmission mode is a mode in which data transmission is performed through PLC using a power line that leads to the voltage input terminal. In the transmission mode, the control circuit modulates the switching of the switching part in accordance with transmission data.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: June 14, 2016
    Assignee: MegaChips Corporation
    Inventor: Takashi Matsutani
  • Patent number: 9220044
    Abstract: A way to deliver traffic to a mobile node that is undergoing a hand off between two Access Routers (AR) is described. The method of the present invention operates to perform some or all of the following: decrease, e.g., minimize, delays between the time the old link breaks and the first packet is sent from the new link; reduce and/or eliminate packet bursts from old to new AR when an old (existing) link breaks; ensure that packets are neither lost nor duplicated during hand off; maintain QoS control of delivery order to the MN; make good or best use of multiple links during make-before-break hand-off; and support both uplink and downlink traffic.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: December 22, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: Alan William O'Neill
  • Patent number: 9094265
    Abstract: A frequency range for Fourier transform is controlled and a digital signal is subjected to fast Fourier transform within the controlled range, whereby a plurality of frequency components (FFT signals) in the digital signal are detected. A transmission rate of a received signal is determined using the detected FFT signals and the FFT signals are demodulated by an operation at a speed corresponding to the determined transmission rate.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: July 28, 2015
    Assignee: Panasonic Corporation
    Inventor: Masahiko Sagisaka
  • Patent number: 9077605
    Abstract: A method for supporting Time-Quadrature Amplitude Modulation (TQAM) in a wireless communication system includes generating a transmission symbol identified by a combination of a QAM symbol and a position of a time resource to which the QAM symbol is mapped, shifting at least one QAM symbol among QAM symbols contained in the transmission symbols with respect to a time axis, and readjusting a constellation point of the QAM symbol on the basis of a shifting quantity. A method for operating a receive end comprises receiving a reception symbol identified by a combination of a QAM symbol and a position of a time resource to which the QAM symbol is mapped, restoring at least one QAM symbol shifted in a transmit end for uniformizing of the time-axis distribution of QAM symbols contained in the reception symbols, generating decoding metrics for the reception symbol, and performing decoding the reception symbol using the decoding metric.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: July 7, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Min Sagong, Chi-Woo Lim, Sung-Nam Hong, Hyun-Kyu Yu, Kyung-Whoon Cheun
  • Patent number: 9019030
    Abstract: A memristor-based emulator including a memristor circuit for use in digital modulation that includes a first current feedback operational amplifier (CFOA) having multiple terminals in communication with a capacitor Cd and in further communication with a resistor Ri. A second CFOA having multiple terminals is in communication with the first CFOA and is adapted to be in further communication with a voltage vM to provide an input current iM for integration by a capacitor Ci. A nonlinear resistor is in communication with the second CFOA. A third CFOA having multiple terminals is in communication with the nonlinear resistor and is in further communication with the first CFOA and a resistor Rd. The third CFOA and the resistor Rd act as an inverting amplifier associated with the nonlinear resistor to increase a current gain to increase a difference between ON and OFF values of a resistance of a realized memristor.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: April 28, 2015
    Assignee: King Fahd University of Petroleum and Minerals
    Inventors: Muhammad Taher Abuelma'atti, Zainualbideen Jamal Khalifa
  • Patent number: 9020063
    Abstract: An frequency shift keying (FSK) transceiver for use in a hearing aid is capable of automatic tuning of the transceiver frequency. The automatic tuning makes use of a phase difference detector and a tuning manager adapted to control the frequency of a resonant circuit of the FSK transceiver according to information received from the phase difference detector. The phase difference detector measures the phase difference across a component of the resonant circuit of the FSK transceiver. If the phase difference of a binary FSK symbol is equal to the phase difference of the opposite binary FSK symbol, the resonant circuit is tuned, otherwise the tuning manager performs a tuning procedure in order to minimize the difference in phase differences, and adjusts the frequency of the resonant circuit accordingly.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: April 28, 2015
    Assignee: Widex A/S
    Inventors: Soren Mollskov Larsen, Niels Ole Knudsen
  • Patent number: 9014218
    Abstract: A signal transmission system including a transmitting device and a receiving device, including: the transmitting device including: a first modulator that modulates a frequency of a control signal; and a first multiplexer that multiplexes the frequency-modulated control signal onto a DVI (Digital Visual Interface) signal to be transmitted to the receiving device via a single network cable; and the receiving device including: a first separator that separates the frequency-modulated control signal from the multiplexed DVI signal; and a first demodulator that demodulates the separated control signal.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: April 21, 2015
    Assignee: Fujitsu Component Limited
    Inventor: Masato Ozawa
  • Patent number: 8995919
    Abstract: In at least one embodiment, a method includes receiving a first transmission from a device, the first transmission transmitted at a first frequency. In response to receiving the first transmission, a transceiver is disabled and a second transmission is transmitted to the device, the second transmission transmitted at a second frequency. The method further includes receiving a third transmission from the device, the third transmission transmitted at the second frequency.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: March 31, 2015
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Randy Zimler, George B. Bolam, James A. Worsham, Jr.
  • Publication number: 20150071369
    Abstract: A communication system having a configurable bandpass filter is disclosed. The system includes a bandpass filter and a bandpass controller. The bandpass filter has an adjustable center frequency. The bandpass controller is configured to identify a frequency shift in a master in or received signal and to shift the center frequency of the bandpass filter according to the identified frequency shift.
    Type: Application
    Filed: September 10, 2013
    Publication date: March 12, 2015
    Applicant: Infineon Technologies AG
    Inventors: David Levy, Dirk Hammerschmidt
  • Patent number: 8971386
    Abstract: The invention relates to the field of radio signal receivers for use in wireless communication networks. In particular to a receiver unit having at least one antenna input for receiving multipath radio signals via a radio unit and at least one antenna from one or more user equipments is provided. The receiver unit comprises: a despreading unit configured to despread a multipath radio signal in the received multipath radio signals using a number of despreading fingers corresponding to a number of delay positions in the multipath radio signal which corresponds to a number of paths in the multipath radio signal, and a combining unit configured to apply at least one weight to the output of each of the number of allocated despreading fingers and combine the weighted outputs into a resulting equalized radio signal.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: March 3, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Henrik Egnell, Nina Blom
  • Publication number: 20150049832
    Abstract: A non-contact power supply transmitter system 100 transmitting an electric power from a transmitting device (TX) 200 to a receiving device (RX) 300 with a non-contact power supply transmitter method, the TX 200 including: a transmitting coil 202; a driver 204 causing the transmitting coil to generate a power signal of the electromagnetic field; and an FSK modulation unit 240 transmitting an FSK signal Sf through the transmitting coil, the RX 300 including: a receiving coil 302; a rectifier circuit 320 rectifying an electric current induced by the receiving coil; an FSK demodulation unit 340 demodulating the FSK signal received through the receiving coil; and a controller 312 controlling so that a rectifying mode of the rectifier circuit is switched to a diode rectifying mode during the FSK communication. The non-contact power supply transmitter system 100 and the RX 300 can execute a stable FSK communication.
    Type: Application
    Filed: August 12, 2014
    Publication date: February 19, 2015
    Inventors: Takashi NOGUCHI, Masatoshi WATANABE
  • Publication number: 20150049833
    Abstract: A non-contact power supply transmitter system 100 transmitting an electric power from a transmitting device (TX) 200 to a receiving device (RX) 300 with a non-contact power supply transmitter method, the TX 200 including: a transmitting coil 202; a driver 204 causing the transmitting coil 202 to generate a power signal of the electromagnetic field; and an FSK modulation unit 240 transmitting an FSK signal Sf through the transmitting coil 202, the RX 300 including: a receiving coil 302; an FSK demodulation unit 330 demodulating the FSK signal Sf received through the receiving coil 302; and a controller 312 inputting the FSK signal demodulated by the FSK demodulation unit 330, the FSK demodulation unit 330 is composed of an analog circuit. The non-contact power supply transmitter system, the receiving device, and the analog circuit can realize a low power, space-saving FSK communication.
    Type: Application
    Filed: August 12, 2014
    Publication date: February 19, 2015
    Inventors: Takashi NOGUCHI, Tatsuya IWASAKI
  • Patent number: 8942306
    Abstract: A method selects a codebook for transmit beamforming. The method constructs an estimated channel matrix based on a codebook, selects a channel submatrix from the estimated channel matrix, calculates a selection matrix from the channel submatrix; and assigns a steering matrix based on the selection matrix. The method may construct an estimated channel matrix, select a channel submatrix, and calculate a selection matrix for each of multiple codebooks, then select an optimal codebook. The steering matrix is assigned based on the optimal codebook. The steering matrix may be used in steering a transmitted packet. The method may also calculate a post-MIMO equalizer signal-to-noise ratio for a data stream, based on the estimated channel matrix and the selected codebook. A related system is also disclosed. Other embodiments are provided, and each of the embodiments described herein can be used alone or in combination with one another.
    Type: Grant
    Filed: May 9, 2013
    Date of Patent: January 27, 2015
    Assignee: Marvell World Trade Ltd.
    Inventors: Hongyuan Zhang, Rohit U. Nabar
  • 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
  • Publication number: 20150003556
    Abstract: The invention provides transmission methods of messages between a tanker aircraft and receiver aircraft that facilitate air refueling operations using a boom device in, particularly, radio silence environments. In the case of data messages, the method comprises steps for transmitting a message from the aircraft that emits the message to the target aircraft as an analog signal via the electro-magnetic connection which is used for contact detection and disconnection and audio communications between the tanker aircraft and the receiver aircraft in radio silence environments. In the case of audio and data messages it is transmitted a signal resulting from mixing analog signals corresponding to both messages in a way that allows their separation at the target aircraft.
    Type: Application
    Filed: June 30, 2014
    Publication date: January 1, 2015
    Inventors: Javier FERNANDEZ GARCíA, Luis Fernando GIMENEZ ABAD
  • Patent number: 8903023
    Abstract: A Bluetooth receiver comprises a RF front end configured to receive a Bluetooth signal including a preamble and 34-bit pseudo-number (PN); a DC estimator communicatively coupled to the RF front end; and a frame synchronizer communicatively coupled to the DC estimator. The DC estimator is configured to perform DC offset estimation by determining an average value of samples of the preamble and the frame synchronizer is configured to use the 34-bit PN for frame synchronization.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: December 2, 2014
    Assignee: Beken Corporation
    Inventors: Weifeng Wang, Yiming Huang, Mingsheng Ao
  • Patent number: 8831145
    Abstract: One embodiment of the present invention relates to a communications system. The system includes a Highway-Addressable Remote Transducer (HART) transmitter comprising a direct memory access (DMA) module configured to access at least one transmitter lookup table (LUT) using DMA transfers to modulate a HART data packet into a frequency-shift keying (FSK) data signal. The system also includes a HART receiver configured to demodulate a received FSK data signal into a demodulated HART data packet.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: September 9, 2014
    Assignee: Texas Instruments Incorporated
    Inventor: Thomas Ray Shelburne
  • Patent number: 8831144
    Abstract: In an FSK receiver according to the present invention, a correction operation for a DC offset component is performed based on a maximum value and a minimum value of a demodulation signal. If a difference between the maximum and minimum values is less than a predetermined threshold value TH1, the correction operation is halted. Thus, the FSK receiver can rapidly perform an appropriate offset removal from a multi-level FSK signal.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: September 9, 2014
    Assignee: Icom Incorporated
    Inventor: Kazunori Shibata
  • Publication number: 20140233668
    Abstract: A repeater includes a clock-and-data recovery element and a phase interpolator to extract an embedded clock frequency from a data stream. The phase interpolator determine a frequency offset and sends such offset as phase interpolator codes to a filter and scaler. The filtered, scaled phase interpolator codes are used to produce a reference clock frequency for retransmission.
    Type: Application
    Filed: April 29, 2013
    Publication date: August 21, 2014
    Applicant: LSI Corporation
    Inventors: Hiep Pham, Chaitanya Palusa, Tomasz Prokop, Adam Healey
  • Patent number: 8792922
    Abstract: Systems and methodologies are described that facilitate mitigation of interference through uplink scheduling in a wireless communication environment. Access points can assign multiple terminals to a single tile or segment of shared resource (e.g., a time frequency region) to maximize the number of terminals supported. However, combinations of certain types of terminals can cause a significant increase in interference. In particular, allocating multiple terminals having a relatively high velocity (e.g., terminals located in moving vehicles) to a single tile can cause an unacceptable increase in interference. To mitigate interference, high velocity terminals can be identified. Once identified, terminals can be allocated to the available tiles based at least in part upon avoiding combinations that result in a significant increase in interference.
    Type: Grant
    Filed: February 28, 2007
    Date of Patent: July 29, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Petru Cristian Budianu, Alexei Gorokhov, Dhananjay Ashok Gore, Ravi Palanki
  • Patent number: 8792575
    Abstract: A multiple-antenna receiver can enable and disable receive radio frequency front-end and analog front-end circuits of specific antenna receiving routes according to a predetermined scheme during the receive data phase. The predetermined scheme calculates signal quality indices of the receiving route antennas according to a preamble sequence, and derives the modulation and coding scheme and the number of spatial streams via the information provided by a header sequence. Indications of the signal quality indices are compared with threshold values to determine which receiving routes are to be turned on and which receiving routes are to be turned off.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: July 29, 2014
    Assignee: Realtek Semiconductor Corp.
    Inventors: Der-Zheng Liu, Jiun-Hung Yu, Kuang-Yu Yen
  • Patent number: 8787487
    Abstract: A distortion compensation device which reduces a distortion of an amplifier which is added to an output signal of the amplifier, the distortion compensation device including: a plurality of distortion compensation coefficient storage circuits which stores a plurality of distortion compensation coefficients and outputs the distortion compensation coefficients according to an amplitude of an input signal of the amplifier, a distortion compensating processing circuit which adds the distortion compensation coefficient output from each of the plurality of distortion compensation coefficient storage circuits to the input signal of the amplifier, and a distortion compensation coefficient updating circuit which performs weighting processing on the distortion compensation coefficient output from each of the plurality of distortion compensation coefficient storage circuits to reduce the distortion compensation coefficient and which calculates an update value of the distortion compensation coefficient by using the disto
    Type: Grant
    Filed: May 2, 2012
    Date of Patent: July 22, 2014
    Assignee: Fujitsu Limited
    Inventors: Kazuo Nagatani, Hiroyoshi Ishikawa, Nobukazu Fudaba, Yuichi Utsunomiya
  • Patent number: 8787425
    Abstract: A signal processing arrangement is designed to process a digitalized phase-modulated and/or digitalized spreaded input signal (1) and has a complex channelizer (2) which despreads and/or demodulates the input signal (1) in the time range on the basis of a folding operation.
    Type: Grant
    Filed: January 18, 2010
    Date of Patent: July 22, 2014
    Assignee: Continental Automotive GmbH
    Inventors: Lutz Braungardt, Martin Opitz, Thomas Reisinger
  • Patent number: 8774748
    Abstract: The high sensitivity FSK radiofrequency signal receiver includes an antenna for receiving FSK radiofrequency signals, a LNA amplifier receiving signals picked up by the antenna, a local oscillator for supplying oscillating signals, a mixer for mixing the incoming signals with the oscillating signals to produce intermediate signals. The receiver includes a broadband or poly-phase filter for filtering the intermediate signals, and a sampler for supplying sampled intermediate signals to a high sensitivity demodulation stage, which supplies data signals. The receiver includes a processing circuit for performing a discrete Fourier transform of sampled intermediate signals. The selector at the processing circuit output determines the difference between the signal amplitude peak frequency above a determined threshold and the expected frequency of the intermediate signals.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: July 8, 2014
    Assignee: The Swatch Group Research and Development Ltd
    Inventors: Arnaud Casagrande, Jean-Luc Arend
  • Patent number: 8774305
    Abstract: Circuitry for use in aligning bytes in a serial data signal (e.g., with deserializer circuitry that operates in part in response to a byte rate clock signal) includes a multistage shift register for shifting the serial data signal through a number of stages at least equal to (and in many cases, preferably more than) the number of bits in a byte. The output signal of any shift register stage can be selected as the output of this “bit slipping” circuitry so that any number of bits over a fairly wide range can be “slipped” to produce or help produce appropriately aligned bytes. The disclosed bit slipping circuitry is alternatively or additionally usable in helping to align (“deskew”) two or more serial data signals that are received via separate communication channels.
    Type: Grant
    Filed: June 3, 2013
    Date of Patent: July 8, 2014
    Assignee: Altera Corporation
    Inventor: Richard Yen-Hsiang Chang
  • Patent number: 8737292
    Abstract: The present invention provides a method of estimating a frequency offset. The method comprises receiving a wireless signal timed according to a first frequency; generating a local signal timed according to a second frequency; and performing a plurality of synchronization searches, each search comprising obtaining a set of correlation results indicative of a correlation between the wireless signal and the local signal at different timing offsets of the wireless signal relative to the local signal. The method the no comprises finding a series of results, with a result from each of a plurality of the synchronization searches, for which the difference in; timing offset between results from adjacent searches in the series is within a maximum specified value. A frequency off set between the first and second frequencies can be determined from the series.
    Type: Grant
    Filed: October 24, 2008
    Date of Patent: May 27, 2014
    Assignee: ICERA, Inc.
    Inventor: Simon Nicholas Walker
  • Patent number: 8731108
    Abstract: Provided is a communication system that includes setting a detection threshold according to a distribution of at least one logic value of a transmission signal corresponding to an on-off keying (OOK) scheme or a frequency shift keying (FSK) scheme, and determining a type of noise source influencing a reception signal using the detection threshold and the distribution of at least one logic value.
    Type: Grant
    Filed: July 6, 2011
    Date of Patent: May 20, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Joon Seong Kang, Hyo Sun Hwang, Chan Soo Hwang
  • Patent number: 8676120
    Abstract: A wireless communication system is provided. The wireless communication system includes a wireless relay and a mobile terminal. The wireless relay is coupled to a phone network. The mobile terminal is physically coupled to the wireless relay to make a voice communication with the phone network via the wireless relay. Further, the mobile terminal and the wireless relay exchange control data and voice data corresponding to the voice communication over a short-range wireless link based on one of a transparent mode and a translation mode. A signaling connection is established on an asynchronous connection-oriented logical (ACL) transport channel between the mobile terminal and the wireless relay for exchanging the control data, and a voice connection is established on a synchronous connection oriented (SCO) channel between the mobile terminal and the wireless relay for exchanging the voice data.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: March 18, 2014
    Assignee: Shenzhen Cloud Communication Epoch Sci-Tech Ltd
    Inventors: Yi Zhang, Ning Ge, Zhiwei Meng, Guangnuan Liu
  • Patent number: 8670077
    Abstract: A method of performing a service scan for available channels across a bandwidth of an input signal, the method comprising the steps of: acquiring a power spectrum of the input signal bandwidth; analyzing the power spectrum to identify a list of candidate channels, each candidate channel being identified by at least a center frequency; processing each of the candidate channels in a receiver unit to extract service information, if present, relating to the candidate channel; and storing the service information for the channel in a memory.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: March 11, 2014
    Assignee: NXP B.V.
    Inventors: Ewout Brandsma, Klaas de Waal, Konstantinos Doris, Erwin Janssen
  • Patent number: 8665995
    Abstract: There is provided a solution for dual channel transmission in a radio communication device. Both transmission signals to be transmitted on different channels are mixed two times by using oscillator signals having the same frequencies for both transmission signals, and the transmission circuitry is arranged to process the signals so that the transmission signals are nevertheless up-converted to different frequency channels.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: March 4, 2014
    Assignee: Nokia Corporation
    Inventor: Risto Vaisanen
  • Patent number: 8660215
    Abstract: A method and apparatus for decoding binary frequency shift key signals in which an exclusive-OR of the sign of a real waveform with a sign of the imaginary waveform at a time shortly after the real (or, alternatively, the imaginary) waveform crosses zero is used to determine a bit represented by the signal. In some embodiments, particularly those in which the bit period is about one-half of the carrier signal frequency, both the real and imaginary waveforms are monitored to detect the zero crossing in order to account for the situation in which data transitions prevent zero-crossings on one of the waveforms.
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: February 25, 2014
    Assignee: Siemens Rail Automation Corporation
    Inventor: Brian Joseph Hogan
  • 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: 8594138
    Abstract: Improvements are disclosed for in-band signaling, i.e., transmission of data in a voice channel of a digital wireless network during a voice call session. A family of narrow-band signaling methods, some employing tapered waveforms, is disclosed to successfully pass data-carrying signals through the low-bit rate modes of the EVRC-B vocoder commonly used in CDMA wireless channels. These features can be used in cell phones or other wireless communication devices, including automotive applications.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: November 26, 2013
    Assignee: Airbiquity Inc.
    Inventor: Michael Hirano
  • Patent number: 8571545
    Abstract: A wireless relay apparatus is provided. The wireless relay apparatus includes a telephone module configured to couple with a public switched telephone network (PSTN) to receive a telephone call, and a wireless module coupled to the telephone module to process the telephone call and configured to wirelessly connect to a mobile terminal such that the telephone call is forwarded to the mobile terminal over a short-range wireless link. Further, the wireless module is configured to operate in one of a transparent mode and a translation mode so as to exchange voice data with the mobile terminal.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: October 29, 2013
    Assignee: Shenzhen Cloud Communication Epoch Sci-Tech Ltd
    Inventors: Ning Ge, Yi Zhang, Zhiwei Meng
  • Patent number: 8565348
    Abstract: The radio transmitting apparatus includes a first initial phase value setting circuit that sets, in the first modulator, an initial value of the phase of the first modulated signal, which is a value at the start of the modulation according to the first modulation scheme. The radio transmitting apparatus includes a second initial phase value setting circuit that sets, in the second modulator, the phase stored in the phase storing circuit as an initial value of the phase of the second modulated signal, which is a value at the start of the modulation according to the second modulation scheme. The radio transmitting apparatus includes a signal gathering circuit that selects and outputs the first modulated signal output from the first modulator and then selects and outputs the second modulated signal output from the second modulator.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: October 22, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Keiji Tsunoda, Hideaki Majima, Hiroyuki Fujiki
  • Patent number: 8542774
    Abstract: A receiver for detecting and recovering data from Orthogonal Frequency Division Multiplexed (OFDM) symbols. The receiver comprises a demodulator, symbol synchronization unit, frequency transform processor, and coarse frequency offset detector. The demodulator generates sampled symbols. The symbol synchronization unit has correlators, which receives the sampled symbols, and a correlation detection processor. Each correlator auto correlates each sampled symbol, and the correlation detection processor determines a start point of each symbol. The frequency transform processor receives the sampled symbols and performs a frequency transform on each symbol.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: September 24, 2013
    Assignee: Sony Corporation
    Inventor: Samuel Asangbeng Atungsiri
  • Patent number: 8514964
    Abstract: Improved control apparatus and methods transfer information between devices, such as controllers and field devices, utilizing a modulator that generates a pulse width modulated (PWM) signal containing information to be transferred by a first of the devices, e.g., the controller, to the second device. A transformer or other inductive device transfers the PWM signal across the isolation barrier, where it is demodulated to analog form for application to the second device, e.g., the field device. Information transferred from the second device to the first device can be transferred in an amplitude modulated (AM) signal that utilizes, as its carrier, a fixed duty cycle output of the modulator that generates the PWM signal.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: August 20, 2013
    Assignee: Invensys Systems, Inc.
    Inventor: James G. Calvin
  • Patent number: 8483311
    Abstract: An apparatus for providing a data encoding scheme may include an encoder. The encoder may be configured to determine, for a digital input value comprising a particular number of bits, whether more than half of the bits of the digital input value have a high value. The encoder may be further configured to encode the digital input value by inverting each of the bits of the digital input value in response to a determination that more than half of the bits of the digital input value have the high value. Corresponding method and computer program product, and a decoder and decoding method are also provided.
    Type: Grant
    Filed: March 6, 2008
    Date of Patent: July 9, 2013
    Assignee: Nokia Corporation
    Inventor: Jaakko Valtteri Varteva
  • Publication number: 20130163688
    Abstract: Improved control apparatus and methods transfer information between devices, such as controllers and field devices, utilizing a modulator that generates a pulse width modulated (PWM) signal containing information to be transferred by a first of the devices, e.g., the controller, to the second device. A transformer or other inductive device transfers the PWM signal across the isolation barrier, where it is demodulated to analog form for application to the second device, e.g., the field device. Information transferred from the second device to the first device can be transferred in an amplitude modulated (AM) signal that utilizes, as its carrier, a fixed duty cycle output of the modulator that generates the PWM signal.
    Type: Application
    Filed: June 26, 2012
    Publication date: June 27, 2013
    Applicant: INVENSYS SYSTEMS, INC.
    Inventor: James G. Calvin
  • Patent number: 8457174
    Abstract: A technique for wirelessly transmitting management data without cables in a data center is provided. Management data is obtained at a device in the data center. A wireless management data signal is generated from the management data. The wireless management data signal is configured to be transmitted at frequencies matching an ambient electromagnetic noise emitted by the data center, such that the wireless management data signal is masked in the ambient electromagnetic noise emitted by the data center. The wireless management data signal is wirelessly transmitted to another device.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: June 4, 2013
    Assignee: International Business Machines Corporation
    Inventors: Casimer M. DeCusatis, Rajaram B. Krishnamurthy, Michael Onghena, Anuradha Rao, Brian J. Neugebauer
  • Patent number: 8457178
    Abstract: Determining a frequency offset of a received signal utilizing two or more multipath components of the received signal is provided herein. By way of example, the received signal can be correlated with a synchronization sequence in a time domain or a frequency domain, resulting in separation of the two or more multipath components of the received signal. Analysis of at least one of the multipath components can provide a frequency offset of the received signal. Furthermore, by analyzing the multipath components, estimation of the frequency offset can be improved as compared with single-signal analysis techniques.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: June 4, 2013
    Assignee: QUALCOMM Incorporated
    Inventor: Tao Luo
  • Patent number: 8423031
    Abstract: In a communication system a base station maps paging information the destinations of which are a plurality of mobile stations to a specific frame of frames and transmits the specific frame to a relay station. The relay station for relaying communication between the base station and the plurality of mobile stations receives the specific frame, maps the paging information the destination of which are the plurality of mobile stations and which is mapped to the specific frame, to the remaining frames of the frames on the basis of a determined rule, and transmits the remaining frames to the plurality of mobile stations. When the plurality of mobile stations are under the control of the relay station, the plurality of mobile stations receive the remaining frames and acquire the paging information on the basis of the determined rule.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: April 16, 2013
    Assignee: Fujitsu Limited
    Inventor: Keiichi Nakatsugawa
  • Patent number: 8422596
    Abstract: A communication device includes: demodulating means for demodulating a transmission signal from another communication device that performs noncontact communication; calculating means for performing at least one of addition and subtraction of a predetermined voltage according to a logical value of a demodulated signal obtained by demodulation by the demodulating means; determining means for determining a communication system of the transmission signal transmitted by the other communication device by comparing a calculation result of the calculating means at predetermined timing after a lapse of a predetermined time from the start of communication with a threshold voltage; and transmitting means for transmitting predetermined data to the other communication device in the communication system determined by the determining means among plural communication systems that the device itself can support.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: April 16, 2013
    Assignee: Sony Corporation
    Inventor: Hidekazu Tomizawa
  • Patent number: 8416834
    Abstract: A technique for wirelessly transmitting management data without cables in a data center is provided. Management data is obtained at a device in the data center. A wireless management data signal is generated from the management data. The wireless management data signal is configured to be transmitted at frequencies matching an ambient electromagnetic noise emitted by the data center, such that the wireless management data signal is masked in the ambient electromagnetic noise emitted by the data center. The wireless management data signal is wirelessly transmitted to another device.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: April 9, 2013
    Assignee: International Business Machines Corporation
    Inventors: Casimer M. DeCusatis, Rajaram B. Krishnamurthy, Michael Onghena, Anuradha Rao, Brian J. Neugebauer
  • Patent number: 8379878
    Abstract: A pre-coding method for improving diversity gain in an Orthogonal Frequency Division Multiplexing (OFDM) system and a transmission apparatus and method are disclosed. The transmission method includes converting an input transmission signal into parallel signals, pre-coding the parallel signals with a predetermined frequency offset, performing Inverse Discrete Fourier Transform (IDFT) on the pre-coded signals, and up-converting the IDFT signals and outputting the up-converted signals to a wireless network. By performing pre-coding on a transmission signal with a frequency offset in an OFDM system, diversity gain can be improved.
    Type: Grant
    Filed: February 28, 2007
    Date of Patent: February 19, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Duck-Dong Hwang, Junhong Hui
  • Patent number: 8369442
    Abstract: A transmitter modulator that is operable to modulate signals according to multiple modulation formats includes a first modulator, a second modulator, and a polarization beam combiner. The first modulator encodes a first signal according to a first modulation format. The second modulator encodes a second signal according to a second modulation format, the first signal orthogonally polarized with respect to the second signal. The polarization beam combiner combines the first signal and the second signal for transmission.
    Type: Grant
    Filed: January 12, 2007
    Date of Patent: February 5, 2013
    Assignee: Fujitsu Limited
    Inventors: Olga I. Vassilieva, Takao Naito
  • Patent number: 8364185
    Abstract: A method of synchronizing a clock for an adjacent network (AN) to a clock for an overlay network (ON) is provided. The method includes extracting an ON clock signal from an outgoing signal transmitted from the overlay network. The AN clock is synchronized to the ON clock based on the extracted ON clock signal.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: January 29, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Nivedan Thadasina, John Csapo, Paul Gilliland
  • Publication number: 20120300869
    Abstract: The present invention realizes low power consumption at the time of an automatic frequency control circuit operation. An automatic frequency control circuit includes a mixing unit that generates a modulated signal from a reception signal according to a frequency of a local signal, a demodulation unit that demodulates the modulated signal supplied by the mixing unit, an error evaluation unit that generates a frequency error signal according to a duty of the demodulated signal supplied by the demodulation unit, a holding unit that holds a frequency setting of the local signal and updates the frequency setting according to the frequency error signal supplied by the error evaluation unit, and an oscillation unit that controls a frequency of the local signal according to the frequency setting supplied by the holding unit.
    Type: Application
    Filed: August 6, 2012
    Publication date: November 29, 2012
    Inventors: Hidenori Orino, Hiromi Saitou
  • Patent number: 8320429
    Abstract: There are provided a receiver in human body communication system using multiple receivers reducing an error rate of receiver signals by applying a space diversity acquisition-related SIMO technology to a plurality of received data using multiple receivers or receiver electrodes in a human body communication system using a human body as a medium, and of stably transmitting the data for the interference of signals generated by other users or from different electronic devices, and a method for receiving data in the human body communication system. The receiver and the method for receiving data in a human body communication system may be useful to stably transmit/receive data without any reduction of its transmission rate by reducing the distortion in channels and the signal noise which are caused in the use of one receiver.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: November 27, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Tae Wook Kang, In Gi Lim, Hyung Il Park, Sung Weon Kang, Kyung Soo Kim, Jung Bum Kim, Chang Hee Hyoung, Duck Gun Park, Sung Eun Kim, Jung Hwan Hwang, Ki Hyuk Park, Jae Hoon Shim, Jin Kyung Kim