Automatic Frequency Control Patents (Class 375/344)
  • Patent number: 10320512
    Abstract: An interference cancelation receiver can cancel channel state information reference signal interference using a single fast fourier transform (FFT), thereby reducing the complexity of the receiver. The transmitter can multiplex a channel state information reference signal (CSI-RS) with a physical downlink shared channel (PDSCH) of another numerology, thereby improving a resource utilization. Thus, significant gains in link and system throughputs can be achieved via the use of the interference cancelation receiver.
    Type: Grant
    Filed: January 8, 2017
    Date of Patent: June 11, 2019
    Assignee: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: SaiRamesh Nammi, Xiaoyi Wang, Arunabha Ghosh
  • Patent number: 10299679
    Abstract: The present disclosure provides a method and a system for wirelessly and passively measuring temperature and devices forming the system. The method includes: receiving an energy feedback radio frequency (RF) signal by a temperature measuring end; converting the energy feedback RF signal into electric energy and storing the electric energy; and starting the temperature measuring end after obtaining the electric energy, and transmitting a RF signal under the current temperature to a terminal, and calculating the current temperature through the terminal. The method, the system and the devices forming the system provided in the present disclosure are capable of activating the crystal oscillator or the ceramic oscillator wirelessly and passively, therefore, the method, the system and the devices can be used to wirelessly and passively measure temperature, which is convenient.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: May 28, 2019
    Assignee: Shenzhen Zhiying Technologies Co., Ltd.
    Inventor: Song Yang
  • Patent number: 10292122
    Abstract: The present disclosure provides a method implemented in an access point, AP, for maintaining synchronization among APs in a radio access network as well as the AP. The method comprises at least one of a transmission step and a reception step. At the transmission step, a first inter-AP synchronization signal is transmitted to a first neighboring AP, which synchronizes to the AP, at a transmission resource indicated by a first synchronization signal transmission/reception pattern associated with the AP, when the first neighboring AP receives the first inter-AP synchronization signal at a reception resource indicated by a second synchronization signal transmission/reception pattern associated with the first neighboring AP, wherein the reception resource indicated by the second synchronization signal transmission/reception pattern overlaps with the transmission resource indicated by the first synchronization signal transmission/reception pattern.
    Type: Grant
    Filed: October 11, 2014
    Date of Patent: May 14, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jinhua Liu, Gen Li, Zhan Zhang
  • Patent number: 10284410
    Abstract: Aspects of the present disclosure are directed to processing signals received from different sources, such as may be relevant to receiving signals having respective time-offsets based upon a distance via which the respective signals travel, and/or due to an oscillator clock mismatch. As may be implemented in accordance with one or more embodiments, respective fast Fourier transform (FFT) series are generated for symbols in respective ones of communications received in parallel. For each message that the receiver is trying to decode, channel estimation is performed on the respective FFT series, and one of the FFT series is selected based upon metrics indicative of interference in the respective FFT series, for that particular message. A decoding timing window is set based on the selected FFT series, and the selected FFT series is decoded.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: May 7, 2019
    Assignee: NXP B.V.
    Inventor: Vincent Pierre Martinez
  • Patent number: 10243541
    Abstract: A method includes receiving a signal from a remote transmitter via an electrically-tunable antenna having a tunable element. An adjustment, to be applied to a response of the electrically-tunable antenna, is calculating by analyzing the received signal. The response of the electrically-tunable antenna is adapted by controlling the tunable element responsively to the estimated adjustment.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: March 26, 2019
    Assignee: ALTAIR SEMICONDUCTOR LTD.
    Inventors: Dima Feldman, Yigal Bitran, Ariel Yagil
  • Patent number: 10237839
    Abstract: Aspects of the present disclosure provide techniques for phase tracking in wireless communications using frames with some portions that use relatively long symbol durations.
    Type: Grant
    Filed: June 14, 2016
    Date of Patent: March 19, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Lin Yang, Bin Tian, Tao Tian
  • Patent number: 10211958
    Abstract: A method for transmitting information, a station, and an access point in a MU-MIMO system includes: determining, by a first station, multiple to-be-sent first long training sequences, where the multiple first long training sequences include at least one pilot for phase tracking; and sending, by the first station, the multiple first long training sequences to an access point on multiple symbols, where a second station sends multiple second long training sequences to the access point on the multiple symbols, the multiple second long training sequences include at least one pilot for phase tracking, and a first pilot for phase tracking and a second pilot for phase tracking occupy different time-frequency resources, where the at least one pilot for phase tracking included in the multiple first long training sequences includes the first pilot for phase tracking.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: February 19, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Weishan Lu, Doron Ezri, Le Liu
  • Patent number: 10129070
    Abstract: Methods and systems for correcting carrier frequency offsets (CFOs) in a wireless transceiver are disclosed. The method includes receiving a first predetermined number of data packets and analyzing the first predetermined number of data packets to determine one or more wireless link quality metrics. The method includes adjusting a local oscillator in accordance with a first local oscillator adjustment strategy. The method includes receiving a second predetermined number of data packets and analyzing the second predetermined number of data packets to determine the one or more wireless link quality metrics. The method includes repeating the first local oscillator adjustment strategy if the wireless link quality metrics improve. The method includes changing to a second local oscillator adjustment strategy if the wireless link quality metrics worsen and adjusting the local oscillator in accordance with the second local oscillator adjustment strategy.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: November 13, 2018
    Assignee: Phazr, Inc.
    Inventors: Robert Clark Daniels, Khurram Muhammad, Farooq Khan
  • Patent number: 10122422
    Abstract: Diversity receiver front end system with amplifier phase compensation. A receiving system can include a first amplifier disposed along a first path, corresponding to a first frequency band, between an input of the receiving system and an output of the receiving system. The receiving system can include a second amplifier disposed along a second path, corresponding to a second frequency band, between the input of the receiving system and the output of the receiving system. The receiving system can include a first phase-shift component disposed along the first path and configured to phase-shift the second frequency band of a signal passing through the first phase-shift component based on a phase-shift caused by the first amplifier at the second frequency band.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: November 6, 2018
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventor: Stephane Richard Marie Wloczysiak
  • Patent number: 10103701
    Abstract: A channel selector for a frequency modulation radio frequency receiver, including a band-pass filter, of which the frequency band is centered on the central frequency of the channel to be selected, and has a width that is automatically variable between a minimum value and a maximum value, the minimum value being determined dynamically proportional to a weighted sum of the field level and the modulation level of the channel, according to a formula MinBW=k1×C+k2×M, in which MinBW is the minimum value, C the field level, k1 the weight associated with the field level, M the modulation level, and k2 the weight associated with the modulation level. The weight associated with the field level is less than the weight associated with the modulation level, preferably in a ratio of 1:3.
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: October 16, 2018
    Assignees: CONTINENTAL AUTOMOTIVE FRANCE, CONTINENTAL AUTOMOTIVE GMBH
    Inventor: Laurent Thery
  • Patent number: 9985805
    Abstract: An adaptive recursive filter is disclosed. The filter includes a filtering device to iteratively apply a recursive filter to signal frames corresponding to portions of a sampled broadband signal. Each iteration of the recursive filter may include generating an autocorrelation signal of an input signal frame, calculating a ratio of a magnitudes of a pair of successive points of the autocorrelation signal, comparing the ratio to a selected signal detection threshold such that a value of the ratio greater than a threshold indicates at least one signal of interest, calculating an energy-weighted average frequency of the input signal frame as a frequency of interest, comparing a spectral energy of the input signal frame at the frequency of interest to spectral energies of surrounding frequencies to identify a frequency of a narrowband interference signal, and filtering the input signal frame at the identified frequency to remove the identified narrowband interference signal.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: May 29, 2018
    Assignee: Rockwell Collins, Inc.
    Inventors: Mark P. Swenholt, Jeffrey L. Box
  • Patent number: 9935720
    Abstract: A system includes a laser configured to generate a tunable optical frequency. The system also includes an optical transmitter to map baseband data to symbols represented in a digital modulation constellation, add a frequency offset to the digital modulation constellation to cause the digital modulation constellation to rotate at a rate equal to the added frequency offset, modulate the optical frequency with the rotating digital modulation constellation, and transmit the resulting modulated optical frequency. The system also includes an optical receiver to receive the transmitted modulated optical frequency and, using the tunable optical frequency, detect the rotating digital modulation constellation conveyed by the received modulated optical frequency.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: April 3, 2018
    Assignee: Cisco Technology, Inc.
    Inventors: Christopher Fludger, Thomas Duthel, Joerg Leykauf, Karsten Michaelsen
  • Patent number: 9888475
    Abstract: A wired network may be used to carry signals for a wireless network, in a frequency-shifted manner, to extend the range of the wireless network. A wired network may detect signal interference emanating from a wireless service provider, and received through a leak in the wired network's infrastructure. Devices may be installed or leveraged in the vicinity of the interference to extend the wireless service to geographic areas that may have poor reception. The devices may amplify wireless downstream signals and transmit them wirelessly, and may receive upstream wireless communications and transmit them upstream in the wired network's protocol.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: February 6, 2018
    Assignee: Comcast Cable Communications, LLC
    Inventors: Lawrence D. Wolcott, Kevin Johns
  • Patent number: 9866416
    Abstract: Embodiments of the present invention relate to methods and systems for simultaneous communication with multiple wireless communication devices. In some embodiments, a method for simultaneous communication with multiple wireless communication devices includes receiving, using a plurality of antennas at a first wireless station, a plurality of packets, comprised of orthogonal frequency division multiplexing (OFDM) wireless signals, transmitted simultaneously from a plurality of other wireless stations wherein each of the simultaneously transmitted packets includes a plurality of frequency tones, frequency domain transform the received packets, grouping frequency domain transform outputs for each subcarrier, determining a difference between subcarrier groups formed over different sample sets, and determining a set of weights for each subcarrier, wherein the weights are selected such that the first wireless station can at least one of detect or demodulate the received plurality of packets.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: January 9, 2018
    Assignee: Cisco Technology, Inc.
    Inventor: Daniel Joseph Lyons
  • Patent number: 9843307
    Abstract: A method includes receiving a signal from a remote transmitter via an electrically-tunable antenna having a tunable element. An adjustment, to be applied to a response of the electrically-tunable antenna, is calculating by analyzing the received signal. The response of the electrically-tunable antenna is adapted by controlling the tunable element responsively to the estimated adjustment.
    Type: Grant
    Filed: October 2, 2015
    Date of Patent: December 12, 2017
    Assignee: ALTAIR SEMICONDUCTOR LTD.
    Inventors: Dima Feldman, Yigal Bitran, Ariel Yagil
  • Patent number: 9755849
    Abstract: A digital broadcasting system and a data processing method are disclosed. A receiving system of the digital broadcasting system includes a receiving unit, an SI handler, and a decoding unit. The receiving unit receives broadcast signals including mobile service data and main service data. The mobile service data configure a data group, and the data group includes a signaling information region in some of a plurality of data regions. The signaling information region may include TPC signaling data and FIC signaling data. The SI handler acquires channel configuration information of the mobile service data from the broadcast signal using pre-decided IP access information, and extracts encoding format information for each IP stream component within a corresponding virtual channel service RTP-packetized and received from the acquired channel configuration information. The decoding unit decodes the mobile service data of the corresponding IP stream component based upon the extracted encoding format information.
    Type: Grant
    Filed: May 10, 2016
    Date of Patent: September 5, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Jae Hyung Song, In Hwan Choi, Jong Yeul Suh, Jin Pil Kim, Chul Soo Lee
  • Patent number: 9735997
    Abstract: The present invention concerns a method for correcting a frequency shift on symbols received by a receiver, each symbol being composed of N samples and of a cyclic prefix of a predetermined number ? samples, the ? samples being a copy of ? samples of the N samples. The receiver: —calculates for each symbol, a correlation between at most the ? samples of the cyclic prefix and the at most ? samples among the last samples, —averages the correlations over a number of symbols and determines one smooth frequency shift estimation for each averaged correlation, —calculates an exponential from the smooth frequency shift estimation, delays the received symbols by a delay, —multiplies the exponential by the delayed received symbols.
    Type: Grant
    Filed: August 26, 2013
    Date of Patent: August 15, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Damien Castelain
  • Patent number: 9735888
    Abstract: In an optical receiver, an optical local oscillator (LO) frequency is generated. A modulated optical frequency is received at the optical receiver. An LO-signal frequency offset between the received modulated optical frequency and the optical LO frequency is determined. A determination is made as to whether the LO-signal frequency offset is in one of multiple predefined non-overlapping target windows that cover respective non-zero LO-signal frequency offsets. If it is determined that the LO-signal frequency offset is not in one of the target windows, the optical LO frequency is tuned to drive the LO-signal frequency offset toward one of the target windows to ensure the LO-signal frequency offset is non-zero.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: August 15, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Christopher Fludger, Thomas Duthel, Joerg Leykauf, Karsten Michaelsen
  • Patent number: 9712263
    Abstract: An example communications device may include a slicer that may generate a digital output signal by thresholding a received signal according to variably set timing and voltage parameters. Testing circuitry may determine expected bit error ratios for multiple time-voltage slices by performing test operations corresponding respectively to the multiple time-voltage slices. Each of the test operations may include setting the timing and voltage parameters of the slicer based on the corresponding time-voltage slice, periodically measuring a bit error ratio based on the digital output signal and determining a confidence level for the measured bit error ratio, and in response to the determined confidence level equaling or exceeding a specified value, designating a current value of the measured bit-error ratio as the expected bit error ratio for the corresponding time-voltage slice and ending the test operation.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: July 18, 2017
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Karl J. Bois, Benjamin Toby, David P. Kopp
  • Patent number: 9712316
    Abstract: In a phase error corrector, a signal extractor extracts received reference signals from received signals, and an error vector calculator calculates the error vectors of phase errors by comparing the extracted received reference signals with a known reference signal that is to be transmitted. A representative vector calculator divides, according to frequency, the error vectors into two or more groups and calculates representative vectors for the respective groups. A correction value calculator calculates, on the basis of the representative vectors, phase correction values for the respective frequencies. A phase corrector uses the calculated phase correction values to correct the phase errors for the respective frequencies.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: July 18, 2017
    Assignee: Panasonic Corporation
    Inventors: Yoshinori Shirakawa, Koichiro Tanaka, Takenori Sakamoto
  • Patent number: 9705474
    Abstract: According to one embodiment, in a complex band pass filter, a second input signal to be supplied to a second active filter circuit has a substantially 90 degree phase difference from a first input signal to be supplied to a first active filter circuit. The first feedback circuit includes a first element having a first impedance and feeds back an output signal of the first active filter circuit to input side of the second active filter circuit. The second feedback circuit includes a second element having a second impedance different from the first impedance and feeds back an output signal of the second active filter circuit to input side of the first active filter circuit. The output circuit outputs an output signal according to a signal from the first active filter circuit and to a signal from the second active filter circuit.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: July 11, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Naotaka Koide
  • Patent number: 9680667
    Abstract: A circuit includes a calculation circuit configured to calculate a noise power of a predetermined-training-sequence pattern repeatedly included in a first signal input into an adaptive equalizer, based on a second signal obtained by compensating the first signal by a compensation circuit, a channel-estimation value based on the second signal, and the predetermined-training-sequence pattern; and an average circuit configured to obtain an average value of estimation values of frequency offsets based on the predetermined-training-sequence pattern having the noise power equal to or smaller than a predetermined power, among estimation values of frequency offsets based on the predetermined-training-sequence pattern, wherein the compensation circuit is configured to compensate a frequency offset of the predetermined-training sequence pattern based on the average value and thereby obtain the second signal, and the adaptive equalizer is configured to perform adaptive-equalization processing of the first signal with a
    Type: Grant
    Filed: July 6, 2016
    Date of Patent: June 13, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Daisuke Sasaki, Kazuhiko Hatae, Tomoki Katou, Nobukazu Koizumi, Masato Oota, Yasuo Ohtomo, Manabu Yamazaki, Masashi Sato
  • Patent number: 9660679
    Abstract: A wireless receiver automatic gain control system includes: a coarse amplification subsystem that receives and amplifies a carrier-modulated signal; a demodulator that generates a baseband signal from the amplified carrier-modulated signal; a fine amplification subsystem that amplifies the baseband signal; and a controller connected to the amplification subsystems. The controller: obtains a unified gain value for the amplification subsystems; based on the unified gain value, selects (i) one of a plurality of coarse gain values defining a set of coarse gain steps each spanning a plurality of unified gain steps, and (ii) one of a plurality of fine gain values defining a set of fine gain steps each spanning a single unified gain step; and sets (i) the gain of the coarse amplification subsystem to the selected coarse gain value, and (ii) the gain of the fine amplification subsystem to the selected fine gain value.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: May 23, 2017
    Assignee: PERASO TECHNOLOGIES INC.
    Inventors: Grigori Temkine, Craig Farnsworth, Arash Tabibiazar, Alexander Tomkins, Bradley Robert Lynch
  • Patent number: 9634699
    Abstract: Disclosed are an apparatus for controlling a wide-band signal transmission gain, which differently applies a transmission gain by the unit of an intermediate frequency (IF) at a transmitting side of a wide-band multi-IF wireless communication system which can convert multiple baseband digital signals into IF signals and thereafter, multiplex and simultaneously transmit the converted IF signals and a signal processing method of the same.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: April 25, 2017
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventor: Yong Su Lee
  • Patent number: 9621274
    Abstract: Consistent with the present disclosure a transmitter is provided that transmits data in either a “quasi-DP-BPSK” (“QDP”) mode or in a DP-QPSK mode. In the QDP mode, data bits are transmitted as changes in phase between first and second phase states along a first axis or as changes in phase between third and fourth phase states along a second axis in the IQ plane. Although the transmitter outputs an optical signal that changes in phase between each of the four states, a sequence bit identifies which axis carries the data bit. The sequence bit is one of a series of sequence bits that may be generated by a pseudo-random number generator. The series of sequence bits can be relatively long, e.g., 32 bits, to permit sufficiently random changes in the axis that carries the data.
    Type: Grant
    Filed: April 7, 2011
    Date of Patent: April 11, 2017
    Assignee: Infinera Corporation
    Inventors: John D. McNicol, Kuang-Tsan Wu
  • Patent number: 9525390
    Abstract: A switching circuit generates a switching pulse that is pulse modulated according to an input signal. An error amplifier includes a phase compensating filter that generates a feedback signal corresponding to the switching pulse. The error amplifier generates an error signal corresponding to a difference between the input signal and the feedback signal. A pulse modulator includes an oscillator that generates a carrier signal having a variable frequency. The pulse modulator pulse-modulates the carrier signal according to the error signal, so as to generate a pulse modulated signal. The phase compensating filter is configured such that its frequency characteristics can be adjusted according to the frequency of the carrier signal.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: December 20, 2016
    Assignee: ROHM CO., LTD.
    Inventor: Takayuki Ibusuki
  • Patent number: 9509377
    Abstract: A communication system provides for adaptive rank determination, for example, a rank 2 transmission in instances where a rank 1 transmission may be indicated under supported feedback modes in current standards where no explicit power adaptation can be assumed, for example, where a user equipment (UE) is limited to reporting a rank 1 channel due to a large dynamic range of a signal or due to a signal received by the UE from one base station (BS) antenna port drowning out a signal received by the UE from another BS antenna port. The communication system provides for the UE to implement rank 2 transmission in such instances by using per-antenna port power control at a BS serving the UE. In one embodiment, the BS controls the rank determination at the UE by signaling transmit power or power offset related parameters to use for rank and transmission parameters determination and feedback.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: November 29, 2016
    Assignee: Google Technology Holdings LLC
    Inventors: Krishna Kamal Sayana, Tyler A. Brown, Robert T. Love, Vijay Nangia
  • Patent number: 9503296
    Abstract: A quadrature detector performs a quadrature detection on an FM signal based on a local oscillation signal, and outputs a baseband signal. A first corrector and a second corrector perform a correction on the baseband signal based on a DC offset correction value. The DC offset detector performs a polar coordinate conversion on the baseband signal, and derives the DC offset value in such a way that respective amplitudes in a plurality of phase domains defined on an IQ plane approximate one another. An FM detector performs an FM detection on the corrected baseband signal, and generates a detection signal. A controller controls the frequency of the local oscillation signal in such a way that a phase component having undergone the polar coordinate conversion by the DC offset detector is rotated.
    Type: Grant
    Filed: January 10, 2016
    Date of Patent: November 22, 2016
    Assignee: JVC KENWOOD CORPORATION
    Inventor: Yasuhide Okuhata
  • Patent number: 9459295
    Abstract: An improved receiver system may include an input to receive an input signal, and a signal generating circuit to generate a desired oscillator signal that is a single sideband radio frequency signal of time varying frequency. The receiver may also include a downconversion stage to generate an intermediate frequency (IF) signal based on the input signal and the desired oscillator signal. A signal processing block in the receiver may be used to produce an output signal based on the IF signal by frequency shifting the IF signal by an amount that compensates for the time varying frequency of the desired oscillator signal. The desired oscillator signal may be generated using a vector signal generator that receives a control value from the signal processing block, converts the control value to a pair of analog input signals, and generates the desired oscillator signal by quadrature modulating the pair of analog input signals.
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: October 4, 2016
    Assignee: National Instruments Corporation
    Inventor: Daniel S. Wertz
  • Patent number: 9451399
    Abstract: A method for receiving a reference signal for positioning in a wireless communication system by a user equipment (UE) is disclosed. The method includes receiving a plurality of reference signal sequences for positioning to which different frequency shift values are applied, calculating a correlation between the plurality of reference signal sequences for positioning and transmitted reference signal sequences for positioning corresponding to the plurality of reference signal sequences in a time domain, and determining a time domain index having a highest value from the correlation as a reference time point for positioning, wherein the frequency shift value is determined according to the sum of multiplication of an index of each reference signal sequence and a frequency shift interval, and frequency offset.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: September 20, 2016
    Assignee: LG ELECTRONICS INC.
    Inventors: Hanjun Park, Daesung Hwang, Kijun Kim, Hyunho Lee, Jonghyun Park, Hyangsun You
  • Patent number: 9444664
    Abstract: Embodiments of the present invention provide a method, includes: performing channel estimation on a signal of a current channel to obtain channel information of the current channel, performing calculation processing on the channel information obtained in current channel estimation and channel information obtained in previous channel estimation to obtain a phase difference of the current channel information, dividing the phase difference of the current channel information by a time interval between two times of channel estimation to obtain residual frequency offset information of the current channel, adding the residual frequency offset information of the current channel and frequency offset information which is of the channel and obtained in a previous calculation to obtain frequency offset information of the current channel, and outputting the frequency offset information of the current channel, so as to perform frequency offset correction on the signal of the channel according to the current frequency offse
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: September 13, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Zihuan Chen, Dafeng Tian, Xiaodong Li, Qiao Liu
  • Patent number: 9430729
    Abstract: In one embodiment, an RFID apparatus is provided, which includes an input circuit that has an input impedance used for receiving RF signals. An RF-signal converter provides an apparatus-operating power signal in response to receiving the RF signals. An impedance circuit provides and selects impedance values in response to at least one select signal provided by a state-machine logic circuit. The state-machine logic circuit provides the select signal(s) in response to the apparatus-operating power signal for selecting the impedance values and therein permit the input impedance to be changed for tuning the RFID apparatus.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: August 30, 2016
    Assignee: NXP B.V.
    Inventors: Rachid El Waffaoui, Christian Weidinger
  • Patent number: 9425842
    Abstract: A wireless receiver automatic gain control system includes: a coarse amplification subsystem that receives and amplifies a carrier-modulated signal; a demodulator that generates a baseband signal from the amplified carrier-modulated signal; a fine amplification subsystem that amplifies the baseband signal; and a controller connected to the amplification subsystems. The controller: obtains a unified gain value for the amplification subsystems; based on the unified gain value, selects (i) one of a plurality of coarse gain values defining a set of coarse gain steps each spanning a plurality of unified gain steps, and (ii) one of a plurality of fine gain values defining a set of fine gain steps each spanning a single unified gain step; and sets (i) the gain of the coarse amplification subsystem to the selected coarse gain value, and (ii) the gain of the fine amplification subsystem to the selected fine gain value.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: August 23, 2016
    Assignee: PERASO TECHNOLOGIES INC.
    Inventors: Grigori Temkine, Craig Farnsworth, Arash Tabibiazar, Alexander Tomkins, Bradley Robert Lynch
  • Patent number: 9363118
    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: Grant
    Filed: August 12, 2014
    Date of Patent: June 7, 2016
    Assignee: ROHM CO., LTD.
    Inventors: Takashi Noguchi, Tatsuya Iwasaki
  • Patent number: 9350501
    Abstract: A base station which uses either one of a plurality of component carriers individually or uses an aggregate carrier which is an aggregate of the above-mentioned plurality of component carriers to carry out radio communications with a mobile terminal corresponding to the above-mentioned component carrier and also carry out radio communications with a mobile terminal corresponding to the above-mentioned aggregate carrier is provided. The base station notifies a bandwidth of an aggregate carrier which is an aggregate of all of the above-mentioned component carriers, as a bandwidth which the above-mentioned base station uses, to the mobile terminal corresponding to the above-mentioned aggregate carrier. As a result, while an improvement in the transmission rate is provided according to the aggregate carrier, the base station can also support an operation of a mobile terminal corresponding to a component carrier.
    Type: Grant
    Filed: April 21, 2010
    Date of Patent: May 24, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Miho Maeda, Mitsuru Mochizuki, Taiga Saegusa, Yasushi Iwane
  • Patent number: 9350579
    Abstract: A method of determining a threshold for symbol detection, includes receiving a most previously input sample value and a result of detecting a most previous symbol, and determining the threshold for the symbol detection of a currently input sample value based on the most previously input sample value and the result of detecting the most previous symbol.
    Type: Grant
    Filed: May 19, 2014
    Date of Patent: May 24, 2016
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Joon Seong Kang, Chang Soon Park, Young Jun Hong
  • Patent number: 9350529
    Abstract: A logical transmission system includes a driver configured to receive a source data and output a first voltage at a first node; a transmission line of a characteristic impedance configured to couple the first node to a second node; a three-point three-level slicer configured to receive a second voltage at the second node and output a first ternary signal, a second ternary signal, and a third ternary in accordance with a first reference voltage, a second reference voltage, a first clock, a second clock, and a third clock; and a CDR (clock-data recovery) unit configured to receive a reference clock, the first ternary signal, the second ternary signal, and the third ternary signal and output a recovered data, the first reference voltage, the second reference voltage, the first clock, the second clock, and the third clock.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: May 24, 2016
    Assignee: REALTEK SEMICONDUCTOR CORP.
    Inventors: Gerchih (Joseph) Chou, Chia-Liang (Leon) Lin
  • Patent number: 9338032
    Abstract: A device includes an input configured to receive a signal, wherein the signal includes at least one data block and a plurality of signal parts known to the device, a first signal part at the beginning of the data block and a second signal part at the end of the data block. The device further includes an equalizer and a pre-equalizer coupled between the input and the equalizer, wherein the pre-equalizer is configured to estimate a phase shift between the plurality of signal parts.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: May 10, 2016
    Assignee: Intel IP Corporation
    Inventors: Michael Genossar, Yaniv Kaver, Vladimir Kravtsov, Uriel Lemberger
  • Patent number: 9306680
    Abstract: A method and a device for calibrating frequency synthesizer in communication terminal are provided. The method may include: controlling the communication terminal to transmit a continuous wave signal in a specified channel; controlling a measurement device to measure the continuous wave signal to obtain a measured frequency deviation value of the frequency synthesizer in the communication terminal; calculating a center oscillation frequency point of a reference crystal oscillator of the communication terminal and a frequency calibration step corresponding to the center oscillation frequency point based on the measured frequency deviation value; and storing the center oscillation frequency point and the corresponding frequency calibration step in the communication terminal. The method can reduce frequency calibration cost and time.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: April 5, 2016
    Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) CO., LTD.
    Inventors: Dian Xu, Yi Zhao, Yufeng Jin
  • Patent number: 9288697
    Abstract: It is an objective of the present invention to provide a circuit with a wideband received signal strength indicator, used for multiple systems. By using the switches and the analog-to-digital converter and the demodulator, the circuit of the present invention has the advantages of auto gain control, circuit size reduction and power-saving.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: March 15, 2016
    Assignee: MICROCHIP TECHNOLOGY INCORPORATED
    Inventors: Peng-Sen Chen, Mei-Show Chen, Jeng-Hong Chen
  • Patent number: 9270139
    Abstract: A core module for a portable computing device includes wireless power receiver circuitry, battery power circuitry, power supply circuitry, a processor, and an RF link interface. The wireless power receiver module, when operable, receives a wireless power transmit signal and converts it into a supply voltage. The battery power circuitry, when operable, outputs a battery voltage. The power supply circuitry, when operable, converts the supply voltage or the battery voltage into one or more power supply voltages. The processor is operable to select one of the battery voltage, the supply voltage, and one of the one or more power supply voltages to produce a selected voltage. The RF link interface outputs the selected voltage on to an RF link of the portable computing device for providing power to one or more multi mode RF units within the portable computing device.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: February 23, 2016
    Assignee: BROADCOM CORPORATION
    Inventors: Ahmadreza (Reza) Rofougaran, Maryam Rofougaran, Brima B. Ibrahim, Hooman Darabi
  • Patent number: 9248003
    Abstract: A receiver for determining the location of a marker that is excited with an exciting waveform. A sensing array having coils is used to sense magnetic flux from the resonating marker. The coils provide inputs to the receiver. The receiver includes a correlation processor for analyzing the inputs in a coherent manner. Further, the receiver is adapted to tune to the resonant frequency of a marker.
    Type: Grant
    Filed: December 31, 2003
    Date of Patent: February 2, 2016
    Assignee: Varian Medical Systems, Inc.
    Inventors: J. Nelson Wright, Laurence J. Newell, Edward J. Vertatschitsch
  • Patent number: 9252998
    Abstract: A radio includes a radio frequency (RF) subsystem to process analog information. A digital subsystem receives input from the RF subsystem, and may include a frequency error estimator and a transmitter. The frequency error estimator may be configured to receive samples from the digital subsystem and to estimate a frequency misalignment, between transmitter and receiver, of each of a plurality of received signals in real time. The transmitter may be configured to transmit to each of a plurality of downstream endpoints on frequencies based in part on the respective estimated frequency misalignments. Such transmissions, at a frequencies expected by each of the downstream endpoints, allows the use of narrower receiver filters by those endpoints. In one example, the plurality of received signals may be received simultaneously and be associated with packets of a plurality of different channel plans, with different channel bandwidths and/or channel spacing, and different channel modulation schemes.
    Type: Grant
    Filed: February 25, 2013
    Date of Patent: February 2, 2016
    Assignee: Itron, Inc.
    Inventor: Danny Ray Seely
  • Patent number: 9246542
    Abstract: In general, the subject matter described in this specification can be embodied in methods, systems, and program products for identifying data that is designated for wireless transmission to a remote computing device. A digital signal that encodes the data for transmission across a band of radio frequency channels is generated. Multiple radio frequency channels in the band that are available are determined. The digital signal is filtered to substantially reduce a power level of the digital signal at frequencies that correspond to channels in the band that have not been determined to be available. The filtered digital signal is converted to an analog signal. The analog signal is provided to an analog transmitter that isolates the band of channels to generate an isolated analog signal and that wirelessly transmits the isolated analog signal over the multiple available channels using one or more antennas.
    Type: Grant
    Filed: October 7, 2013
    Date of Patent: January 26, 2016
    Assignee: Google Inc.
    Inventors: E. Daniel McCloskey, C. Philip Gossett
  • Patent number: 9220079
    Abstract: A signal analysis device includes a synchronization data generation unit, a synchronization correction value calculation unit, and a correction unit. The synchronization unit outputs an A/D-converted correction signal as first synchronization data. The first synchronization data is associated with time based on the timing of a trigger signal input from the outside. The synchronization correction value calculation unit calculates, as a first synchronization correction value, an amplitude ratio, a phase difference, and a time difference between the first synchronization data and second synchronization data input from the outside on the basis of the first synchronization data and the second synchronization data. The correction unit corrects the amplitude, phase, and timing of the RF signal output from the object to be measured, on the basis of the first synchronization correction value or a second synchronization correction value input from the outside.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: December 22, 2015
    Assignee: ANRITSU CORPORATION
    Inventors: Shinichi Ito, Go Inoue, Jun Ono, Keisuke Nishio, Yuki Kondo
  • Patent number: 9197286
    Abstract: An apparatus includes: an offset adjustment unit supplying an offset correction signal corresponding to a frequency switching to an adder unit receiving output from a mixer; a timing adjustment unit adjusting the timing of a frequency switching signal supplied to a local oscillator and the timing of an offset correction amount switching signal supplied to the offset adjustment unit for changing an offset amount in correspondence with the frequency switching in the local oscillator; a noise amount measurement and calculation unit receiving a signal obtained by amplifying and filtering the signal from the adder unit, to measure a noise amount of the signal and generates a timing determination signal based on the noise amount; and a control unit controlling frequency switching signal timing and the offset correction amount switching signal supplied to the timing adjustment unit, based on the timing determination signal from the noise amount measurement and calculation unit.
    Type: Grant
    Filed: August 8, 2014
    Date of Patent: November 24, 2015
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventor: Takahiro Kawano
  • Patent number: 9195862
    Abstract: A radio frequency identifying reader (RFID) and a method for locating a tag by the RFID includes transmitting, by the RFID reader, signals to the tag on at least two frequencies and receiving a corresponding reflection signal, combining, by the RFID reader, received reflection signals and acquiring the combined signal which is received, and mapping the combined signal that is received to a constellation point in a constellation map to locate the tag such that the tag can be more easily located.
    Type: Grant
    Filed: January 14, 2011
    Date of Patent: November 24, 2015
    Assignee: Siemens Aktiengesellschaft
    Inventors: Dieter Horst, Dan Yu, Yong Yuan
  • Patent number: 9197477
    Abstract: A circuit for processing Carrier Aggregation (CA) is provided. The circuit includes a plurality of Component Carrier (CC) processors, each CC processor configured to estimate a frequency offset for a related CC and to compensate the estimated frequency offset, a reference clock generator configured to generate a reference clock using a reference frequency offset as one of frequency offsets output from the plurality of CC processors, a plurality of reception Phase Lock Loop (PLL) units, each reception PLL unit configured to generate a reception carrier frequency for the related CC corresponding to the reference clock, and a plurality of transmission PLL units, each transmission PLL unit configured to generate a transmission carrier frequency for the related CC corresponding to the reference clock.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: November 24, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Joo-Hyun Do, In-Hyoung Kim
  • Patent number: 9191130
    Abstract: The invention relates to a multi-carrier method in a measurement device for improving reach of a measurement, said method comprising: transmitting a first signal in a sequence, measuring a response to said first signal, calculating a first transfer function for frequency of each modulated subcarrier in the first signal, transmitting a second signal of the sequence, wherein at least one subcarrier in the second signal has modulation different from that of the subcarriers in the first signal, measuring a response to said second signal, calculating a second transfer function for frequency of each modulated subcarrier in the second signal, said second transfer function comprising for each frequency a thereto associated second distortion component, calculating a mean value of all first and second transfer functions. The invention further relates to a measurement device for performing said method.
    Type: Grant
    Filed: January 5, 2012
    Date of Patent: November 17, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Miguel Berg, Antoni Fertner, Daniel Cederholm, Per Ola Börjesson
  • Patent number: 9191964
    Abstract: Disclosed is a method for improving the efficiency of sharing a frequency between a plurality of adjacent systems using an idle band. A method for allocating an operating channel priority between frequency sharing systems according to the present invention includes: a coarse channel priority allocating operation of collecting information about a target white space object (WSO) for priority allocation of an operating channel and information about the operating channel, and classifying the operating channel based on a predetermined criterion; and a fine channel priority allocating operation of removing the operating channel by checking an interference level of the classified operating channel.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: November 17, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Dong Hun Lee, Hyun Duk Kang, Byung Jang Jeong