Frequency Shift Keying Patents (Class 375/334)
  • Patent number: 10243690
    Abstract: The present invention relates to a method of improving the performance in bandwidth constrained communication systems while reducing the complexity of the equalizer used for information retrieval, as well as to improving the capacity of communication systems. These properties are achieved by appropriate information encoding, prior to signal shaping before transmission, whereas the equalizer complexity is reduced by applying the intersymbol interference shortening filter prior to the information retrieving equalization. A proper combination of the recounted elements is capable of providing a qualitatively improved and previously unsuspected performance, as compared to its constituent elements.
    Type: Grant
    Filed: July 2, 2018
    Date of Patent: March 26, 2019
    Assignee: SANS R&D, LLC
    Inventors: Nikola Alic, John G. Proakis
  • Patent number: 10149270
    Abstract: A method, device and system for positioning user equipment (UE). The method is applied to a communications system including a location card, a signal transmitter and a reader. The location card and the signal transmitter are in a one-to-one correspondence, a distance between the location card and the signal transmitter corresponding to the location card is less than a preset value, and the method includes detecting, by the location card, an uplink signal sent by UE, and generating, by the location card, a first signal according to the uplink signal, and sending the first signal to the reader such that the reader determines a location of the UE according to the first signal and a location of the location card. The method not only simplifies a method for positioning UE in other approaches, but also improves accuracy of UE positioning.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: December 4, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventor: Yi Zhang
  • Patent number: 10126498
    Abstract: An optical circuit capable of operating as a 90° optical hybrid includes a phase-symmetric optical splitter and a 90° optical splitter, and two 2x2 optical couplers as optical combiners. The input ports of the optical combiners and the output ports of the optical splitters face a common area therebetween, with the optical splitters interposed between optical combiners as viewed along the circumference of the common area. The output ports of each optical splitter is connected to closest input ports of the optical combiners with optical waveguides of a same length. The length of the waveguides may be minimized when the optical couplers and the optical splitters are disposed in a cross-like configuration.
    Type: Grant
    Filed: July 25, 2017
    Date of Patent: November 13, 2018
    Assignee: Elenion Technologies, LLC
    Inventors: Yangjin Ma, Yang Liu
  • Patent number: 10044534
    Abstract: Embodiments described herein include a receiver, a method, and a plurality of high-pass filters for demodulating a radio frequency (RF) signal. An example receiver includes a plurality of high-pass filters. The receiver includes a demodulator configured to demodulate an RF signal received at an input of the demodulator and configured to output a demodulated signal. The receiver also includes a plurality of high-pass filters connected to an output of the demodulator. The plurality of high-pass filters are configured to receive the demodulated signal and configured to high-pass filter the demodulated signal. The plurality of high-pass filters are configured to operate with a first set of filter responses during a first time period of the demodulated signal and configured to operate with a second set of filter responses during a second time period of the demodulated signal.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: August 7, 2018
    Assignee: Stichting IMEC Nederland
    Inventor: Johan van den Heuvel
  • Patent number: 9705477
    Abstract: The present invention is a computationally-efficient compensator for removing nonlinear distortion. The compensator operates in a digital post-compensation configuration for linearization of devices or systems such as analog-to-digital converters and RF receiver electronics. The compensator also operates in a digital pre-compensation configuration for linearization of devices or systems such as digital-to-analog converters, RF power amplifiers, and RF transmitter electronics. The compensator effectively removes nonlinear distortion in these systems in a computationally efficient hardware or software implementation by using one or more factored multi-rate Volterra filters. Volterra filters are efficiently factored into parallel FIR filters and only the filters with energy above a prescribed threshold are actually implemented, which significantly reduces the complexity while still providing accurate results.
    Type: Grant
    Filed: September 3, 2015
    Date of Patent: July 11, 2017
    Assignee: Innovation Digital, LLC
    Inventor: Scott R. Velazquez
  • Patent number: 9548815
    Abstract: Embodiments may provide a way of communicating via an electromagnetic radiator, or light source, that can be amplitude modulated such as light emitting diode (LED) lighting and receivers or detectors that can determine data from light received from the amplitude modulated electromagnetic radiator. Some embodiments may provide a waveform in the form of chips at a chipping clock frequency that switch a light source between on and off states to communicate via light sources that can be amplitude modulated such as LED lighting. Some embodiments may provide a method of transmitting the waveform via modulated LED lighting. Some embodiments are intended for indoor navigation via photogrammetry (i.e., image processing) using self-identifying LED light anchors. In many embodiments, the data signal may be communicated via the light source at amplitude modulating frequencies such that the resulting flicker is not perceivable to the human eye.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: January 17, 2017
    Assignee: Intel Corporation
    Inventors: Richard D. Roberts, Praveen Gopalakrishnan, Mathys C. Walma
  • Patent number: 9515855
    Abstract: Frequency shifting a communications signal(s) in a multiple frequency (multi-frequency) distributed antenna system (DAS) to avoid or reduce frequency interference is disclosed. Related devices, methods, and DASs are disclosed. Non-limiting examples of frequency interference include frequency band interference and frequency channel interference. As a non-limiting example, frequency interference in a multi-frequency DAS may result from non-linearity of a signal processing component generating an out-of-band harmonic of a first, in-use communications signal in a first frequency band, within different frequency band(s) of other in-use communications signal(s). To avoid or reduce such interference, embodiments disclosed herein involve predicting frequency interference that may result from processing received, in-use communications signals in multiple frequency bands to be distributed in a multi-frequency DAS.
    Type: Grant
    Filed: January 18, 2016
    Date of Patent: December 6, 2016
    Assignee: Corning Optical Communications Wireless Ltd
    Inventor: Dror Harel
  • Patent number: 9355744
    Abstract: A dynamic memory signal phase tracking method is provided. The method, applied to a memory controller that accesses a memory module, includes: issuing a memory access command and an access request to an arbiter to request for an access right of the memory module; when the access right is obtained, forwarding the memory access command to the memory module and asserting a flag signal; during a period of asserting the flag signal, sequentially using a plurality of candidate delay phases to adjust a memory signal for latching test data from the memory module, determining a delay phase according to latching results corresponding to the candidate delay phases, and recording the determined delay phases; updating an optimal delay phase according to the determined delay phase; and accessing the memory module according to the updated optimal delay phase.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: May 31, 2016
    Assignee: MSTAR SEMICONDUCTOR, INC.
    Inventors: Yung Chang, Chen-Nan Lin, Chung-Ching Chen
  • Publication number: 20150146823
    Abstract: A wireless network receiver includes a detection module that uses preamble data in a data frame for signal processing functions and the detection module is configured to adjust the number of preamble data bits that are used based on the power of a received signal.
    Type: Application
    Filed: June 3, 2014
    Publication date: May 28, 2015
    Inventors: Wenxun Qiu, Timothy Mark Schmidl, Minghua Fu, Anuj Batra
  • Publication number: 20150139363
    Abstract: A frequency-shift keying (FSK) receiver includes an injection-locking oscillating circuit to receive a FSK input signal, and a phase detecting circuit. The injection-locking oscillating circuit outputs a locked signal having a phase that tracks a phase of the FSK input signal. A difference between the phases of the FSK input signal and the locked signal is associated with a difference between a frequency of the FSK input signal and a free-running frequency of the injection-locking oscillating circuit. The phase detecting circuit receives the FSK input signal and the locked signal, and outputs a baseband logic signal according to the difference between the phases of the FSK input signal and the locked signal.
    Type: Application
    Filed: May 20, 2014
    Publication date: May 21, 2015
    Applicant: National Chi Nan University
    Inventors: Yo-Sheng LIN, Chien-Chin WANG, Chien-Yu LI
  • Publication number: 20150103957
    Abstract: A method for processing an electrical signal comprises receiving an electrical signal comprising a frequency modulated signal encoding digital data, sampling a first portion of the electrical signal to provide a first sample set, and determining an intermediate value from the first sample set. A first output value is selected from a plurality of stored output values based on the intermediate value, the output value indicating a frequency modulation encoded value within the first portion of the electrical signal. An indication of the obtained output value is output.
    Type: Application
    Filed: October 2, 2014
    Publication date: April 16, 2015
    Inventors: Philip J. Agar, Alison Cooper
  • Patent number: 9001933
    Abstract: A receiving apparatus receives an FSK signal, converts the FSK signal into a phasor including amplitude and phase, estimates and compensates for a CFO (carrier frequency offset) from the converted phasor, and recovers a data bit from the converted phasor.
    Type: Grant
    Filed: July 18, 2013
    Date of Patent: April 7, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Mi Kyung Oh, Byoung Hak Kim, Cheol-ho Shin, Jaehwan Kim, Sangsung Choi
  • Patent number: 9000969
    Abstract: A received plurality of signals may be filtered to select an in-band signal and/or an out-of-band. A signal strength of the selected signal(s) may be measured. A resolution of an analog-to-digital converter may be controlled based on the measured signal strength(s). The selected in-band signal may be converted to a digital representation via the analog-to-digital converter. The resolution may be decreased when the strength of the in-band signal is higher, and increased when the strength of the in-band signal is lower. The resolution may be increased when the strength of the out-of-band signal is higher, and decreased when the strength of the out-of-band signal is lower. A signal-to-noise ratio and/or dynamic range of the selected signal(s) may be determined based on the measured signal strength(s), and may be utilized to adjust the resolution of the analog-to-digital converter.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: April 7, 2015
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza Rofougaran
  • 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: 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: 8867669
    Abstract: A circuit and a method for removing a frequency offset and a communication apparatus including the circuit, capable of removing the frequency offset by tracking rapidly and accurately in a payload section. A sequence of sample levels is obtained by sampling a frequency level of the baseband signal at every 0.5 symbol interval. Absolute values of differences between the frequency levels adjacent to each other at every 1 symbol are calculated as first difference absolute values. Absolute values of differences between the frequency levels adjacent to each other at every 1 symbol are calculated as second difference absolute values. When the first difference absolute values are greater than a predetermined first determination value or the second difference absolute values are less than a predetermined second determination value, the average value calculated is set as the frequency offset.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: October 21, 2014
    Assignee: LAPIS Semiconductor Co., Ltd.
    Inventor: Koutaro Mizuno
  • 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
  • Patent number: 8824992
    Abstract: Aspects of a method and system for wireless local area network (WLAN) phase shifter training are presented. Aspect of the system may enable a receiving station, at which is located a plurality of receiving antennas, to estimate the relative phase at which each of the receiving antennas receives signals from a transmitting station. This process may be referred to as phase shifter training. After determining the relative phase for each of the receiving antennas, the receiving station may process received signals by phase shifting the signals received via each of the receiving antennas in accordance with the relative phase shifts determined during the phase shifter training process. Signals received via a selected one of the receiving antennas may be unshifted. The processed signals may be combined to generate a diversity reception signal.
    Type: Grant
    Filed: May 15, 2013
    Date of Patent: September 2, 2014
    Assignee: Broadcom Corporation
    Inventor: Mark Gonikberg
  • Patent number: 8817931
    Abstract: An apparatus and a method are described for envelope detection used in fields including voice processing, image processing, data communication, and energy/data transmission. The apparatus and the method for envelope detection eliminate a carrier component from a modulated signal by performing a square-sum operation between two adjacent sampling signals among signals sampled from the modulated signal. The apparatus and the method detect an envelope of the modulated signal from the modulated signal in which the carrier component is eliminated.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: August 26, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ui Kun Kwon, Sang Joon Kim
  • Patent number: 8811542
    Abstract: Low noise mixers for use in RFID readers and RFID readers configured to receive data from ISO HDX transponders in accordance with embodiments of the invention are illustrated. One embodiment of the invention receives the HDX FSK signal using a resonant antenna, upwardly mixes the FSK signal to an intermediate frequency, filters the intermediate frequency FSK signal using at least one ceramic bandpass filter, and demodulates the filtered intermediate frequency FSK signal to produce a binary output.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: August 19, 2014
    Assignee: Aleis Pty Ltd.
    Inventor: Leigh Bateman
  • Patent number: 8781031
    Abstract: The receiver (1) picks up low rate FSK radio frequency signals. This receiver includes an antenna (2) for receiving FSK radio frequency signals, a low noise amplifier (3) connected to the antenna, a local oscillator (7) for supplying oscillating signals (LO), a phase shift circuit (16) for performing a 0° to 90° phase shift, and vice versa, in the oscillating signals (LO) or the incoming FSK radio frequency signals in each semi-period of a phase switching cycle (1/fs). The phase shift circuit alternately and successively generates in-phase and quadrature oscillating signals, or in-phase and quadrature incoming FSK radio frequency signals. The receiver includes a single mixer (4) for mixing the oscillating signals successively with the incoming FSK radio frequency signals, so as to generate alternately intermediate in-phase and quadrature baseband signals (INT) as a function of the phase shift circuit.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: July 15, 2014
    Assignee: The Swatch Group Research and Development Ltd.
    Inventor: Arnaud Casagrande
  • Patent number: 8781029
    Abstract: Provided is a frequency offset estimation apparatus that appropriately estimates and compensates for a frequency offset of a received signal when estimating the frequency offset which is the difference between a carrier frequency of the received signal and the frequency of an output signal of a local oscillator.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: July 15, 2014
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Tadao Nakagawa, Munehiro Matsui, Koichi Ishihara, Riichi Kudo, Takayuki Kobayashi, Etsushi Yamazaki, Akihide Sano, Eiji Yoshida, Masato Mizoguchi, Yutaka Miyamoto, Yasushi Takatori
  • 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: 8774196
    Abstract: The present disclosure relates to an active antenna array for a mobile communications network. The active antenna comprises a base band unit coupled to a base station, a plurality of transceiver units and at least one link. The plurality of transceiver units is terminated by at least one antenna element. The at least one link couples individual ones of the plurality of transceiver units to the base band unit 10. The at least one link is a digital link and is adapted to relay an individual transmit signal concurrently and in synchronisation with a transmit clock signal. The present disclosure further teaches a method for relaying radio signals in a mobile communications network. The present disclosure further relates to a computer program enabling a computer to manufacture the active antenna array of the present disclosure and to execute the method of relaying radio signal in a mobile communications system.
    Type: Grant
    Filed: June 3, 2010
    Date of Patent: July 8, 2014
    Assignee: Kathrein-Werke KG
    Inventors: Georg Schmidt, Johannes Schlee
  • Patent number: 8750427
    Abstract: An apparatus and method for demodulation of FSK signals are provided. Digital pulses of the FSK signals can be processed to detect digital data contained in the FSK frequencies by converting the FSK frequencies from a frequency signal to a digital logic signal and vice versa.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: June 10, 2014
    Assignee: Honeywell International Inc.
    Inventors: Harvinder Singh, Abdul Hakim, Srikanth K.S, Harinath Babu M R
  • Patent number: 8750426
    Abstract: The receiver (1) for FSK modulation signals includes an antenna (2) for receiving modulated data or control signals, a low noise amplifier (3) for amplifying and filtering the signals picked up by the antenna, a local oscillator (6) with a quartz resonator (7) for supplying high frequency, in-phase signals (SI), and high frequency, in-quadrature signals (SQ), first and second mixers (4, 5) for mixing the high frequency, in-phase and in-quadrature signals with the filtered and amplified incoming signals, in order to generate intermediate signals (Im, Qm), and a filtering unit (12) for filtering the intermediate signals. The receiver can be configured to receive modulated data or control signals at low rate.
    Type: Grant
    Filed: April 6, 2010
    Date of Patent: June 10, 2014
    Assignee: The Swatch Group Research and Development Ltd
    Inventors: Arnaud Casagrande, Carlos Velasquez, Emil Zellweger
  • Patent number: 8737537
    Abstract: A system for processing signal communications between a frequency translation module and an integrated receiver decoder. According to an exemplary embodiment, the decoder and the frequency translation module comprise a signal processing apparatus comprising an input for receiving an frequency shift keyed modulated signal, an amplifier having negative feedback coupled to said input, wherein said input is further coupled to a first source of reference potential and a second source of reference potential; and a tank circuit coupled between said differential amplifier and an output.
    Type: Grant
    Filed: March 13, 2007
    Date of Patent: May 27, 2014
    Assignee: Thomson Licensing
    Inventor: Robert Alan Pitsch
  • 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: 8731032
    Abstract: A communication apparatus for a continuous phase modulation signal. The communication apparatus includes a first processing unit configured to generate first information of the continuous phase modulation signal using first symbol data; a symbol converting unit configured to convert the first symbol data into second symbol data or convert the second symbol data into the first symbol data; a symbol storage unit configured to store the second symbol data; a second processing unit configured to second information of the continuous phase modulation signal using the second symbol data stored in the symbol storage unit; a third processing unit configured to generate third information of the continuous phase modulation signal using a modulo operation of an integer related to a modulation index; and an output unit configured to add an output from the third processing unit and an output from the first processing unit and generate the continuous phase modulation signal.
    Type: Grant
    Filed: October 11, 2011
    Date of Patent: May 20, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Pan-Soo Kim, Yong-Ho Lee, Deock-Gil Oh, Xavier Giraud
  • Patent number: 8719616
    Abstract: A method for encoder frequency-shift compensation includes determining frequency values of an input encoder signal, determining repeatable frequency-shifts of the frequency values and generating a frequency-shift compensated clock using the repeatable frequency-shifts. A frequency-shift compensated clock includes a synthesizer configured to generate a frequency-shift compensated clock signal using repeatable frequency shifts and encoder clock signals.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: May 6, 2014
    Assignee: Seagate Technology LLC
    Inventors: Koichi Wago, Sundeep Chauhan, David M. Tung
  • Patent number: 8718196
    Abstract: A symbol error detector can be configured to detect symbol errors of GFSK modulated portions of a Bluetooth packet without relying solely on a CRC error detection mechanism. The symbol error detector can operate on frequency error signals that are a difference between a frequency associated with a current symbol and predetermined frequency outputs from a bank of filters matched to a frequency response of the Bluetooth receiver for predefined combinations of three consecutive symbols (i.e., an estimated previously decoded symbol, an estimated current symbol, and an estimated subsequent symbol). The frequency error signals can be compared against a threshold and against each other to determine a potential unreliability in decoding the current symbol and to determine whether to generate a symbol error notification. The frequency error signals being within a threshold of each other can indicate potential unreliability in decoding the current symbol.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: May 6, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Soner Ozgur
  • 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: 8654897
    Abstract: A receiving circuit, a transmitting circuit, a micro-controller, and a method for power line carrier communication. The receiving circuit includes: an analog amplifier, a receiving filter, an analog-to-digital converter, a digital mixer, a digital filter, and a digital demodulator connected successively. The transmitting circuit includes: a digital modulator, a gain controller, a digital-to-analog converter, a transmitting filter, and a transmitting amplifier connected successively. The micro-controller includes a central processor and the receiving circuit or the transmitting circuit. The method for power line carrier communication can be implemented based on the receiving circuit or the micro-controller.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: February 18, 2014
    Assignees: Qingdao Eastsoft Communication Technology Co., Ltd., Shanghai Haier Integrated Circuit Co., Ltd.
    Inventors: Yajun Hu, Song Pan, Jian Cui, Guangsheng Chen, Rui Wang
  • Patent number: 8649416
    Abstract: A mobile electronic device that includes a circuitry configured to acquire synchronization with a spreading code of an intermediate frequency signal that is obtained by converting a frequency of a received signal from a satellite in a global positioning system into a predetermined intermediate frequency, demodulate a message included in the intermediate frequency signal, output a primary signal to a predetermined signal line, and attach a predetermined header to a secondary signal and output the result to the predetermined signal line, and includes a display unit configured to display data corresponding to the primary signal and the secondary signal, such that the primary signal includes results of measuring one of position, velocity, and time of the mobile electronic device based on the message that is demodulated by the circuitry, and that the secondary signal includes the intermediate frequency signal.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: February 11, 2014
    Assignee: Sony Corporation
    Inventors: Katsuyuki Tanaka, Manabu Nitta
  • Patent number: 8649465
    Abstract: The invention relates to methods for adaptive clock reconstruction and decoding in audio frequency. The method includes the steps of: receiving a modulated signal, wherein the modulated signal is modulated by RC-FSK (Return to Carrier Frequency Shifting Keying); performing a spectrum analysis to the modulated signal to obtain a plurality of frequency envelopes; storing the frequency envelopes; searching the peak values of the frequency envelopes and the time points corresponding to the peak values to modify an estimated period; and generating a clock period for the RC-FSK demodulation and a clock phase for the RC-FSK demodulation according to the estimated period.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: February 11, 2014
    Assignee: Generalplus Technology Inc.
    Inventor: Chia-Sheng Hsu
  • Patent number: 8638884
    Abstract: The data processing unit (15) for a receiver of signals carrying information (1) includes a clock and data recovery circuit (16) on the basis of a data signal (DOUT), and a processor circuit (17) connected to the clock and data recovery circuit. The clock and data recovery circuit is clocked by a local clock signal (CLK) and includes a numerical phase lock loop, in which a numerically controlled oscillator (25) is arranged. This numerically controlled oscillator generates an in-phase pulse signal (IP) and a quadrature pulse signal (QP) at output. The frequency and phase of the pulse signals IP and QP are adapted on the basis of the received data signal (DOUT). The processor circuit is arranged to calculate over time the mean and variance of the numerical input signal (NCOIN) of the numerically controlled oscillator (25), so as to determine the coherence of the data signal if the calculated mean and variance are below a predefined coherence threshold.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: January 28, 2014
    Assignee: The Swatch Group Research and Development Ltd
    Inventor: Arnaud Casagrande
  • Publication number: 20140023164
    Abstract: A receiving apparatus receives an FSK signal, converts the FSK signal into a phasor including amplitude and phase, estimates and compensates for a CFO (carrier frequency offset) from the converted phasor, and recovers a data bit from the converted phasor.
    Type: Application
    Filed: July 18, 2013
    Publication date: January 23, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Mi Kyung OH, Byoung Hak KIM, cheol-ho SHIN, Jaehwan KIM, Sangsung CHOI
  • Patent number: 8629716
    Abstract: A modulator, a demodulator and a modulator-demodulator are provided. A modulator includes a first intermediate signal processing path adapted to route a first intermediate signal; a second intermediate signal processing path adapted to route a second intermediate signal; a first amplifier coupled into the first intermediate signal processing path; a second amplifier coupled into the second intermediate signal processing path; and a chopper circuit coupled into the first intermediate signal processing path; wherein the chopper circuit is adapted to process the first intermediate signal in dependence on first baseband data; wherein the first amplifier is adapted to amplify the first intermediate signal processed by the chopper circuit in dependence on second baseband data; and wherein the second amplifier is adapted to amplify the second intermediate signal in dependence on the second baseband data.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: January 14, 2014
    Assignee: Agency for Science, Technology and Research
    Inventors: Dong Han, Yuanjin Zheng
  • Patent number: 8625720
    Abstract: A detector for zero crossings and a counter which is connected to it are used to determine the time intervals between the zero crossings of the received signal or of an intermediate-frequency signal which is produced from the received signal, and for detection of the digital signal data. In this case, a sequence of determined zero crossing intervals can be stored in digital form in a shift register chain, and can be compared in a classification device with previously stored interval sequences. Furthermore, a frequency offset can be determined by averaging the zero crossing intervals and can be compensated for by suitable selection or modification of the previously stored interval sequences, in which case the latter can also be used during the synchronization phase. The synchronization process may, furthermore, be assisted by payload data identification.
    Type: Grant
    Filed: September 21, 2009
    Date of Patent: January 7, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Dieter Brueckmann, André Neubauer
  • Patent number: 8625722
    Abstract: A Gaussian Frequency Shift Key (GFSK) receiver includes a receiver front end to receive a GFSK-modulated signal and convert the received GFSK-modulated signal to a baseband frequency modulated signal, a channel filter to reduce channel interference which is adjacent to a desired channel of the baseband frequency modulated signal, a demodulator to demodulate the channel filtered baseband modulated signal and to recover a sequence of symbols, a digital filter to reduce inter-symbol interference (ISI) from the sequence of symbols, a slicer to produce symbol decisions based on the filtered sequence of symbols, and a symbol-to-bit mapper to map the symbol decisions to data bits.
    Type: Grant
    Filed: July 30, 2010
    Date of Patent: January 7, 2014
    Assignee: Sensus USA Inc.
    Inventor: Robert E. Rouquette
  • Patent number: 8599861
    Abstract: The present disclosure teaches an active antenna array for a mobile communications network. The active antenna array comprises a base band unit, a plurality of transceiver units terminated by at least one antenna element; and at least one link. The link couples the individual ones of the plurality of transceiver units to the base band unit. The link is a digital link and is adapted to relay a payload signal at a selectable payload rate. The digital link is further adapted to relay a timing signal at a fixed timing rate, when the timing signal is embedded in the payload at a selectable payload rate. The present disclosure further teaches a method for relaying radio signals and a computer program for manufacturing the active antenna array and for executing the method.
    Type: Grant
    Filed: June 3, 2010
    Date of Patent: December 3, 2013
    Assignee: KATHREIN-Werke KG
    Inventors: Georg Schmidt, Johannes Schlee
  • 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: 8565338
    Abstract: This disclosure relates systems and methods for a high bandwidth modulation and transmission of communication signals.
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: October 22, 2013
    Assignee: Intel Mobile Communications GmbH
    Inventors: Peter Singerl, Thomas Blocher, Thomas Poetscher, Andreas Wiesbauer
  • Patent number: 8559554
    Abstract: A radio transmitter is provided at least comprising a signal generator for generating a continuous signal and an antenna for outputting a transmission signal, wherein at least one output of the signal generator is connected with at least one input of the antenna. Herein, the signal generator is connected with the antenna via an interrupt unit connected between the two for selectively interrupting and maintaining a signal connection between the signal generator and the antenna.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: October 15, 2013
    Assignee: Symeo GmbH
    Inventors: Martin Vossiek, Peter Gulden, Sven Röhr
  • Patent number: 8537933
    Abstract: Disclosed herein is a receiving device, including a receiving section configured to receive only a partial segment among a plurality of segments obtained by dividing a frequency band of one physical channel when the receiving device is in a waiting state, and return from the waiting state to an activated state when warning information is transmitted, if transmission of the warning information by the partial segment is possible.
    Type: Grant
    Filed: January 24, 2011
    Date of Patent: September 17, 2013
    Assignee: Sony Corporation
    Inventors: Tamotsu Ikeda, Satoshi Okada, Ryuichiro Shimura, Takuya Okamoto
  • Patent number: 8519784
    Abstract: An FSK demodulator and a method for detecting an inflection point extract a greater amount of effective inflection points of a frequency detection signal while reducing erroneous detection of the inflection points. The inflection point detector includes an inflection point extraction part to extract the inflection point corresponding to variation of a sample value of an amplitude value of the frequency detection signal, an amplitude determination part to determine if a size between peak values of sample values in front and rear of the inflection point exists in a first predetermined range, a preamble determination part to determine if a difference between initial and final sample values of at least one of a symbol having the extracted inflection point and a right before symbol exists in a second predetermined range, and an AND operation part to determine a normal inflection point.
    Type: Grant
    Filed: February 16, 2012
    Date of Patent: August 27, 2013
    Assignee: Lapis Semiconductor Co., Ltd.
    Inventor: Takamitsu Hafuka
  • Patent number: 8514980
    Abstract: Systems and methods are disclosed for providing bandwidth adjustment. The disclosed systems and methods may include receiving an input signal having at least one attribute and an input bandwidth. Furthermore, the disclosed systems and methods may include producing a first adjusted signal. The first adjusted signal may comprise the input signal with a first adjusted bandwidth. The first adjusted bandwidth may comprise the input bandwidth adjusted based on the at least one attribute and at least one first preference. In addition, the disclosed systems and methods may include providing the first adjusted signal to a first end use device.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: August 20, 2013
    Assignee: AT&T Intellectual Property I, L.P.
    Inventor: Christian Kuhtz
  • Patent number: 8513975
    Abstract: Hardware and processes are provided for efficient interpretation of multi-value signals. The multi-value signals have a first voltage range with is used to indicate multiple numerical or logical values, and a second voltage range that is used to provide control functions. In one example, the multi-value circuitry is arranged as a set of rows and columns, which may be cascaded together. The control function can be implemented to cause portions of rows, columns, or cascaded connections to be powered off, thereby saving power and enabling more efficient operation.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: August 20, 2013
    Inventor: Benjamin J. Cooper
  • Patent number: 8483322
    Abstract: A receiver front end receives a local frequency reference signal and a Frequency Shift Keying modulated signal comprising a synchronisation sequence, and downconverts the Frequency Shift Keying modulated signal to provide baseband in-phase and quadrature signals. A pulse generator receives the in-phase and quadrature signals, generates an in-phase pulse signal ILEAD comprising pulses aligned with edges of the baseband in-phase and quadrature signals when the baseband in-phase signal leads the baseband quadrature signal, and generates a quadrature pulse signal QLEAD comprising pulses aligned with edges of the baseband quadrature and in-phase signals when the baseband quadrature signal leads the baseband in-phase signal. A frequency corrector receives the in-phase and quadrature pulse signals during receipt of the synchronisation sequence, compares the pulse signals to a target, and generates a control signal for controlling the local signal generator in dependence upon the result of the comparison.
    Type: Grant
    Filed: July 28, 2008
    Date of Patent: July 9, 2013
    Assignee: Toumaz Technology Limited
    Inventor: Ganesh Kathiresan