Frequency Control Patents (Class 455/71)
  • Patent number: 12238773
    Abstract: A frame transmission method, includes: sending, by a first communication end to a second communication end, a first RTS on an unlicensed channel, wherein the first RTS carries a licensed frequency band source indication; receiving, according to the licensed frequency band source indication, an assist-clear to send (A-CTS) that is sent by the second communication end in a retreat state on the licensed channel; and sending, according to the A-CTS, a first clear-request to send (C-RTS) on the unlicensed channel, wherein the first C-RTS is configured for instructing a third communication end to exit the retreat state entered based on the first RTS.
    Type: Grant
    Filed: November 29, 2019
    Date of Patent: February 25, 2025
    Assignees: Beijing Xiaomi Mobile Software Co., Ltd., Beijing University of Posts and Telecommunications
    Inventors: Yajun Zhu, Wei Hong, Junli Li, Yong Li
  • Patent number: 10701604
    Abstract: A radio communication system including: a base station apparatus; and a terminal apparatus, wherein radio communication is performed between the base station apparatus and the terminal apparatus, and the base station apparatus or the terminal apparatus includes: a controller configured to identify a category of the terminal apparatus classified according to performance or capability of the terminal apparatus, based on at least one of first information and second information, the first information including the performance or capability of the terminal apparatus with respect to a non-orthogonal multiple access scheme, the second information including the performance or capability of the terminal apparatus with respect to an orthogonal multiple access scheme.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: June 30, 2020
    Assignee: FUJITSU LIMITED
    Inventor: Takayoshi Ode
  • Patent number: 9286879
    Abstract: A scheme for localizing a wireless user equipment (UE) device's relative position with respect to a spatial configuration based on audio signatures received via a multi-channel audio system, e.g., an audio system of a vehicle or home entertainment system. The wireless UE device is configured to capture the audio signatures received from a head unit that are placed in an out-of-hearing band of a captured signal. The wireless UE device includes a persistent memory module having program instructions for processing the captured signal including the out-of-band signatures, which may comprise either channel-specific pseudo-random noise (PN) sequences or single-frequency tones, in order to compute time delays or power levels associated with the speaker channels. A localization module is configured to estimate the wireless UE device's relative position based on the time delays or power levels.
    Type: Grant
    Filed: September 17, 2012
    Date of Patent: March 15, 2016
    Assignee: BlackBerry Limited
    Inventors: Nam Nguyen, Sagar Dhakal
  • Patent number: 9002285
    Abstract: Disclosed is a wireless terminal for performing independent distributed-type wireless communication with a portable wireless terminal. The wireless terminal is provided with: a channel setting section for setting a channel on which wireless communication with the portable wireless terminal is performed; a trigger receiving section for receiving a trigger; a free channel search section for searching for a free channel in response to the trigger received, and for delivering a signal, which changes the set channel in accordance with the search result, to the channel setting section; and a transmission section for transmitting to the portable wireless terminal a signal which reports the change.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: April 7, 2015
    Assignee: Olympus Corporation
    Inventors: Yasuhiro Hasegawa, Manabu Ishizeki
  • Publication number: 20150093999
    Abstract: Methods and systems for generating and providing signals to a device, and configuring the device are disclosed. An example method can comprise identifying a device tuned to a first frequency, determining a signal configured to provide interference at the first frequency, and providing the signal to the device such that the device is caused to no longer be tuned to the first frequency.
    Type: Application
    Filed: May 20, 2014
    Publication date: April 2, 2015
    Applicant: Comcast Cable Communications, LLC
    Inventor: Jason Sydney Giardino
  • Patent number: 8954086
    Abstract: The invention disclosed herein relates to a wireless communication system and a user equipment (UE) providing wireless communication services, and more particularly, to a method of effectively performing the measurement of a plurality of frequencies while reducing the measurement load of the UE in the carrier aggregation technology for increasing data transmission speed using a plurality of frequencies in an Evolved Universal Mobile Telecommunications System (E-UMTS), a Long Term Evolution (LTE) system, and a LTE-Advanced (LTE-A) system that have evolved from a Universal Mobile Telecommunications System (UMTS).
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: February 10, 2015
    Assignee: LG Electronics Inc.
    Inventors: Sung-Duck Chun, Seung-June Yi, Sung-Hoon Jung, Sung-Jun Park
  • Patent number: 8949061
    Abstract: A DTV pilot tone is detected in a noisy environment by computing a power average of Fast Fourier Transform (FFT) output spectra of a received signal, finding a power peak in the averaged outputs, computing an adjustment parameter to center the power peak in a Discrete Fourier Transform bin of the averaged output spectra, applying the adjustment parameter to adjust the received signal, computing a coherent average of FFT output spectra of the adjusted signal, and, testing a power spectrum of the coherent average for the presence of the DTV pilot tone.
    Type: Grant
    Filed: July 13, 2011
    Date of Patent: February 3, 2015
    Assignee: Wi-Lan, Inc.
    Inventors: Vajira Samarasooriya, Daniel Payer, James S. Wight
  • Patent number: 8929834
    Abstract: An EHF communication system including an EHF communication chip. The EHF communication chip may include an EHF communication circuit having at least one controllable parameter-based module having a testable and controllable operating parameter The EHF communication chip may further include a test and trim circuit coupled to the EHF communication circuit, where the test and trim circuit includes a logic circuit having one or more memory elements, where the logic circuit is coupled to the controllable parameter-based module.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: January 6, 2015
    Assignee: Keyssa, Inc.
    Inventors: Ian A. Kyles, Gary D. McCormack
  • Patent number: 8841989
    Abstract: An electronic messaging device includes a receiver configured to receive a message at one of a first operational frequency and second operational frequency. The messaging device can operate using a time synchronous protocol and can receive commands through over-the-internet-programming (OTIP) and over-the-air-programming (OTAP).
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: September 23, 2014
    Assignee: American Messaging Services, LLC
    Inventors: John F. Nagel, J. Roy Pottle, Peter C. Barnett, David Andersen, Jamie Gordon Nichol, Sangsoo Kim
  • Patent number: 8831079
    Abstract: A symbol rate detection apparatus includes an analog-to-digital converter (ADC), a coarse detection module, a mixer, a down-sampling module, and a fine detection module. The ADC converts an analog input signal to a digital input signal at an original sampling frequency. The coarse detection module estimates a carrier frequency offset and a coarse symbol rate according to the digital input signal. The mixer adjusts the frequency of the digital input signal according to the carrier frequency offset to generate a frequency-compensated signal. The fine detection module determines a fine symbol rate according to the frequency-compensated signal.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: September 9, 2014
    Assignee: Mstar Semiconductor, Inc.
    Inventors: Yi-Ying Liao, Tung-Sheng Lin, Tai-Lai Tung
  • Patent number: 8744020
    Abstract: A frequency offset of a received signal comprising a number of subsequently received data symbols is estimated. A first estimate is determined from a calculated change in phase of the received signal between two received symbols having a first time distance between them. At least one further estimate is determined from a calculated change in phase of the received signal between two received symbols having a different time distance. A frequency periodicity is determined for each estimate from the distance between the two received symbols from which the estimate was determined. A set of integer values is determined for each estimate so that frequency values calculated for each estimate as the frequency periodicity multiplied by the integer value added to the estimate are at least approximately equal to each other, and a corrected estimate of the frequency offset is determined from the integer values.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: June 3, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Niklas Andgart, Fredrik Nordström
  • Patent number: 8698581
    Abstract: A frequency tunable filter is disclosed. The disclosed filter comprises a filter unit having a sliding member so as to be capable of tuning a frequency band of a frequency signal being filtered; a communication module configured to receive a control signal for controlling the tuning of the frequency band; and a control unit configured to control the tuning of the frequency band by moving the sliding member based on the control signal. With the disclosed filter, the tuning of the filter may be performed automatically by way of control signals transmitted from a remote location.
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: April 15, 2014
    Assignee: Ace Technologies Corporation
    Inventors: Sang-Ho Han, Won-Jae Lee
  • Patent number: 8655263
    Abstract: A method for searching for a broadcast/multicast single frequency network cluster, when a terminal needs to receive the broadcast/multicast service in the broadcast/multicast single frequency network cluster, the terminal synchronizes to a non broadcast/multicast single frequency network cell which is associated with the broadcast/multicast single frequency network cluster; and the terminal searches for the broadcast/multicast single frequency network cluster on the basis of the information indicated by the system information in the non broadcast/multicast single frequency network cell. So that the UE can search for the corresponding MBSFN cluster, and can receive the MBMS service in the searched MBSFN cluster.
    Type: Grant
    Filed: July 18, 2008
    Date of Patent: February 18, 2014
    Assignee: China Academy of Telecommunications Technology
    Inventors: Xuelong Wang, Yu Ding, Shiyan Ren, Lei Mao
  • Patent number: 8634501
    Abstract: A method and apparatus is disclosed to process a received single stream communication signal and/or a multiple stream communication. A communications receiver is configured to receive the received communication signal. A communications receiver determines whether the received communication signal includes a single stream communication signal or a multiple stream communication signal. The communications receiver determines whether a received communication signal complies with a known single stream communications standard. The communications receiver determines whether the received communication signal complies with a known multiple stream communications standard. The communications receiver decodes the received communication signal according to the known single stream communications standard upon determining the received communication includes the signal single stream communication signal.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: January 21, 2014
    Assignee: Broadcom Corporation
    Inventor: Rohit V. Gaikwad
  • Patent number: 8548032
    Abstract: A method and apparatus for detecting a radar signal is provided. The method includes collecting a plurality of pulses based on a reference time or a reference pulse collection count, classifying the plurality of pulses into groups based on similarity of pulse widths, classifying the groups into a short-pulse type and a long-pulse type and calculate the number of groups in each type, and determining whether a radar signal exists based on a number of groups in each type.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: October 1, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Ji Tae Kim
  • Patent number: 8526997
    Abstract: A frequency control device receiving a signal transmitted from each of a plurality of mobile stations, the frequency control device includes a first detecting unit to detect a frequency deviation generated from the signal, a second detecting unit to acquire information about at least a current position or movement of each of the mobile stations as classification information, and a classifying unit to classify mobile stations estimated to be moving in a same moving direction with a same moving speed as a first mobile station based on the classification information. The frequency control device includes a first calculating unit to calculate a first frequency deviations of a signal received from the first mobile station, and a compensation unit to compensate the frequency deviation of the signal received from the first mobile station based on the first frequency deviation.
    Type: Grant
    Filed: March 22, 2010
    Date of Patent: September 3, 2013
    Assignee: Fujitsu Limited
    Inventor: Toshio Kawasaki
  • Publication number: 20130225093
    Abstract: A wireless communication method is provided. This method includes: selecting one of a plurality of predetermined frequency bands each time a switch operation is manually performed in a transmitter, and then using the selected frequency band to transmit a radio signal corresponding to the switch operation for a predetermined specified transmission time; in a receiver apparatus, receiving the transmitted wireless signal, and then recognizing the content of a command that has already been assigned in accordance with the switch operation; and defining an intermittent reception standby period, which is repeated at a predetermined cycle for each of the frequency bands.
    Type: Application
    Filed: September 6, 2011
    Publication date: August 29, 2013
    Applicants: DENSO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroko Murakami, Hiroki Okada, Arinobu Kimura, Kazuhiro Nakashima
  • Patent number: 8494458
    Abstract: A facility for performing employing multiple frequencies in a secure distributed hierarchical convergence network is described. The facility receives a signal in a first frequency, converts the received signal to an internal representation, applies a business rule to the converted signal, and, when the business rule indicates that the signal should be transmitted in a second frequency, causes the internal representation of the signal to be translated to a second frequency and transmitted in the second frequency.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: July 23, 2013
    Assignee: CoCo Communications Corp.
    Inventors: Mark L. Tucker, Jeremy Bruestle, Riley Eller, Brian Retford, Choong Ng
  • Patent number: 8489133
    Abstract: Receiver (2) sequentially switches a preset frequency change amount in stages from a large value to a small value. According to the reception side frequency change amount, the reception side frequency candidate for detecting a synchronization signal is calculated. Synchronization signal detection unit (5) detects a synchronization signal transmitted from a transmission device by using the calculated reception side frequency candidate. Moreover, transmitter (1) calculates a transmission side frequency candidate as a frequency candidate for transmitting the synchronization signal according to the largest possible frequency change amount calculated according to the bandwidth of the synchronization signal.
    Type: Grant
    Filed: June 4, 2007
    Date of Patent: July 16, 2013
    Assignee: NEC Corporation
    Inventor: Mariko Matsumoto
  • Patent number: 8467758
    Abstract: According to one embodiment, a register outputs a first control code in first and second operation modes, saves the first control code as a third control code at an end of the first operation mode, and outputs the third control code at a beginning of a third operation mode. In the first operation mode, a digital-to-analog converter supplies a control signal with a control voltage to a voltage controlled oscillator. In the second operation mode, the control signal is supplied to a buffer amplifier, the amplifier drives a bandlimiting filter, and the filter generates the control voltage. In the third operation mode, the control signal is supplied to the filter, and the filter generates the control voltage.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: June 18, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Akihide Sai
  • Patent number: 8406702
    Abstract: A clock signal generating arrangement for a communication device generates a system clock signal at an output for use as a timing reference. The clock signal generating arrangement comprises a reference clock generator for generating a reference clock signal, a main clock generator for generating a main clock signal having a greater accuracy than the reference clock signal, a clock adjust circuit coupled to the reference clock generator for generating a compensated reference clock signal to compensate for error in the reference clock signal and a clock signal selector coupled to the reference clock generator the main clock generator and the clock adjust circuit.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: March 26, 2013
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Michael Crowley, Norman Beamish, Sean Sexton, Kenneth Stebbings
  • Patent number: 8391780
    Abstract: A system and method of communicating signals is provided. The system includes a plurality of satellites, at least one receiver, and at least one satellite uplink station. The plurality of satellites include at least one active satellite. The at least one receiver is in communication with the plurality of satellites, and receives a signal from the at least one active satellite. The at least one satellite uplink station is in communication with the plurality of satellites, and transmits the signal and alters a frequency of the signal based upon a location of the at least one active satellite to reduce a Doppler frequency shift when activating and deactivating the plurality of satellites.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: March 5, 2013
    Assignee: Delphi Technologies, Inc.
    Inventors: Larry J. Fruit, Eric A. Dibiaso
  • Patent number: 8369445
    Abstract: According to one embodiment, a method for communication includes receiving, by a receiver, a first modulated signal. The first modulated signal includes at least one error. The method also includes demodulating the first modulated signal. The demodulation includes compensating for the at least one error utilizing information related to a velocity of the receiver.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: February 5, 2013
    Assignee: Raytheon Company
    Inventor: Marion P. Hensley
  • Patent number: 8355675
    Abstract: An apparatus and a method for mitigating interference between uplink signals of a user equipment in a mobile communication system are provided. The apparatus includes a frequency regulator for, when fast movement of a user equipment is confirmed, changing a transmit frequency by calculating a frequency offset compensation value which compensates for a frequency required for a transmit frequency band.
    Type: Grant
    Filed: February 4, 2009
    Date of Patent: January 15, 2013
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Hee-Jin Roh, Sang-Min Bae
  • Patent number: 8340606
    Abstract: A transmitter and a signal amplifier are provided. The signal amplifier includes a digital-to-analog converter converting an input digital signal into an analog signal, a local oscillator signal generator outputting in-phase and quadrature-phase oscillator signals, a first mixer mixing the analog signal with the in-phase local oscillator signal to output an in-phase high frequency signal, a second mixer mixing the analog signal with the quadrature-phase local oscillator signal to output a quadrature-phase high frequency signal, a main amplifier amplifying the in-phase high frequency signal output from the first mixer, and an auxiliary amplifier amplifying the quadrature-phase high frequency signal output from the second mixer.
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: December 25, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jin-soo Park, Do-hyung Kim, Jin-wook Burm, Seong-soo Lee, Heung-bae Lee
  • Patent number: 8335503
    Abstract: In an idle state transition from a macro mobile network to a femtocell, a mobile station looks for the femtocell to operate in a frequency band typically assigned to a macro network. For normal macro network operations, mobile stations look for base stations operating on various channels, e.g. based on hashing of respective mobile station identifiers. Femtocells generate a pilot beacon on a carrier frequency to enable mobile station acquisition, e.g. to redirect a mobile station to the operating frequency of the femtocell. To avoid the need to continually cycle or hop through all possible macro assigned carrier frequencies, pilot beacon transmissions of a particular femtocell are prioritized to correspond to the mobile station(s) expected to utilize that femtocell, e.g. by using existing network information, provisioning device information or self learning/calculating information regarding the carrier most likely to be used by any particular mobile station expected to use the femtocell.
    Type: Grant
    Filed: February 23, 2009
    Date of Patent: December 18, 2012
    Assignee: Cellco Partnership
    Inventors: Christopher Michael Desmond, Alicia Lauren Aull, Charles Albert Sanders, Michael Kearns, Eugene A. Carucci
  • Patent number: 8311491
    Abstract: A system to provide narrowcast communications uses adaptive data rate control to individual subscribers such that the effects of precipitation or other link conditions, which are not common to all subscribers, is mitigated. The invention takes advantage of the fact that the narrowcast data consist of packets which are individually addressed to specific subscribers, or groups of subscribers. The narrowcast data is communicated on a plurality of channels, each of potentially differing data rates. The subscribers are assigned a particular channel, based upon their link quality, to receive packets addressed to them. The lower data rate channel will be less affected by adverse link conditions and are hence assigned to subscribers most likely to incur adverse link conditions.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: November 13, 2012
    Assignee: ViaSat, Inc.
    Inventors: Mark J. Miller, Mark D. Dankberg
  • Patent number: 8306568
    Abstract: Technology is provided for a plurality of people that are waiting for a service/meeting with information relating to the queue. A registration unit is arranged to place people waiting for a service/meeting in a queue. At least one radio transmitter is arranged to transmit information relating to the queue to unidentified radio receivers so that the people may receive the information via the unidentified radio receivers.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: November 6, 2012
    Assignee: Q-Matic AB
    Inventor: Michael Ray Snyder
  • Patent number: 8301162
    Abstract: A communication system comprising one or more transceiver units of a first type and one or more transceiver units of a second type capable of communicating with the transceiver units of the first type; each transceiver unit of the first type comprising: a frequency comparison unit for comparing the frequency of a signal received from a transceiver unit of the second type with a reference frequency; a feedback signal generator for generating a feedback signal dependent on the result of that comparison; and a transmitter for transmitting that signal to the transceiver unit of the second type; and each transceiver unit of the second type comprising: a local frequency reference unit on which the frequency of signals transmitted by it are dependent; and a frequency adjustment unit for receiving the feedback signal and adjusting the local frequency reference unit in dependence on the feedback signal.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: October 30, 2012
    Assignee: Ubisense Limited
    Inventor: Andrew Martin Robert Ward
  • Patent number: 8290439
    Abstract: Embodiments include systems and methods for RFI mitigation in a wireless computing environment. In one embodiment, a platform determines RFI information of the platform by listening with a receiver of a transceiver of the platform when the transmitter of the transceiver is quiescent. The platform derives Frequency Domain Weights from the RFI information and transmits the Frequency Domain Weights to a Wireless Access Point (WAP). In the transmitter and receiver of the WAP, the Frequency Domain Weights are applied to signals received and to be transmitted.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: October 16, 2012
    Assignee: Intel Corporation
    Inventors: Kyungtae Han, Keith R. Tinsley
  • Patent number: 8255000
    Abstract: Process for computing an estimation of the frequency offset in a receiver for a UMTS communication network said receiver receives the signal transmitted by two antennas and including two Common Pilot CHannels (CPICH), said process involving the steps of separating the two signals by means of computation and computing the frequency offset on the base of the two separated signals
    Type: Grant
    Filed: June 2, 2010
    Date of Patent: August 28, 2012
    Assignee: ST-Ericsson SA
    Inventors: Issam Toufik, Andrea Ancora
  • Publication number: 20120202433
    Abstract: Disclosed is a wireless terminal for performing independent distributed-type wireless communication with a portable wireless terminal. The wireless terminal is provided with: a channel setting section for setting a channel on which wireless communication with the portable wireless terminal is performed; a trigger receiving section for receiving a trigger; a free channel search section for searching for a free channel in response to the trigger received, and for delivering a signal, which changes the set channel in accordance with the search result, to the channel setting section; and a transmission section for transmitting to the portable wireless terminal a signal which reports the change.
    Type: Application
    Filed: April 17, 2012
    Publication date: August 9, 2012
    Applicants: OLYMPUS MEDICAL SYSTEMS CORP., OLYMPUS CORPORATION
    Inventors: Yasuhiro Hasegawa, Manabu Ishizeki
  • Patent number: 8189655
    Abstract: A digital amplifier amplifies an input signal from a tuner (107) which receives a broadcast wave of a set receiving frequency so as to suppress degradation of the high-band reproduction performance and lowering of the amplification efficiency.
    Type: Grant
    Filed: August 28, 2007
    Date of Patent: May 29, 2012
    Assignee: Panasonic Corporation
    Inventors: Ryota Homma, Koji Kudo
  • Patent number: 8183981
    Abstract: A passive tag receiving a reader signal provided by a reader is disclosed. The passive tag includes an antenna, an oscillator circuit, and an internal chip. The antenna receives the reader signal. The reader signal is within an operation frequency band. The oscillator circuit is coupled to the antenna and generates a frequency signal. The internal chip processes the reader signal according to power provided by the reader signal and the frequency signal when the reader signal is received and the frequency signal is generated.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: May 22, 2012
    Assignee: National Taiwan University of Science and Technology
    Inventors: Hsin-Chin Liu, Jhih-Guo Peng
  • Publication number: 20120122409
    Abstract: A wireless communication system corresponding to a wireless terminal device in which at least one of a first frequency bandwidth for use in an up link and a second frequency bandwidth for use in a down link is variable, including a capability information reception unit capable of receiving and extracting terminal capability information transmitted from the wireless terminal device and related to capability of the wireless terminal device; a category designation unit capable of designating a terminal category to which the wireless terminal device belongs, based on the terminal capability information received and extracted by the capability information reception unit; and a link setting unit capable of setting a link to the wireless terminal device and transmitting a control signal depending on the link setting to the wireless terminal device, based on the terminal category designated by the category designation unit.
    Type: Application
    Filed: January 23, 2012
    Publication date: May 17, 2012
    Applicant: FUJITSU LIMITED
    Inventor: Takayoshi ODE
  • Publication number: 20120028588
    Abstract: To appropriately effect a coordination with a plurality of communication parties that perform a millimeter wave communication. Transmission and reception beams of the respective terminal stations are directed to an access point, a valid communication link based on the second communication method is utilized as a link for a high speed data transmission between the access point and the respective terminal stations. Of course, the communication link based on the first communication method between the access point and the respective terminal stations is valid and is utilized as a link for the coordination. As the transmission and reception beams are not directed between the terminal stations, the communication link based on the second communication method is invalid, but the valid communication link based on the first communication method can be utilized as the link for the coordination.
    Type: Application
    Filed: February 9, 2010
    Publication date: February 2, 2012
    Applicant: Sony Corporation
    Inventors: Yuichi Morioka, Kazuyuki Sakoda, Hiroaki Takano
  • Patent number: 8018914
    Abstract: A demodulation section 13 receives a TDMA-TDD based phase-modulated burst signal of mobile communications and demodulates the burst signal by a synchronous detection system (or a quasi-synchronous detection system). The demodulation section 13 includes a frequency deviation compensation section and a carrier recovery section each having a loop filter 14 with three or more stages of time constants. The time constants are switched by a selector switch 15 based on a control signal from a demodulation control section 16. This achieves quick pull-in and jitter after convergence is minimized, thereby allowing highly efficient performance of frequency deviation compensation, etc. that is required for synchronous detection (or quasi-synchronous detection) without increasing the size of circuit.
    Type: Grant
    Filed: May 17, 2004
    Date of Patent: September 13, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventor: Taisei Suemitsu
  • Patent number: 7991362
    Abstract: A wireless terminal determines the position of a moving base station and determines timing and/or frequency corrections. A wireless terminal determines its relative position with respect to the base station and determines a timing adjustment correction. The wireless terminal applies the determined timing correction to control uplink signaling timing and achieve synchronization at the base station's receiver. The wireless terminal determines its relative velocity with respect to the moving base station and determines a Doppler shift adjustment which it adds to the uplink carrier frequency or to its baseband signal. Base station position is determined from the current time and stored information correlating the base station position with time, e.g., for a geo-synchronous satellite. Base station position information, e.g., a GPS derived base station position fix, is determined from downlink airlink broadcast information, e.g., for an aircraft base station.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: August 2, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Frank A. Lane, Rajiv Laroia, Junyi Li
  • Patent number: 7929928
    Abstract: A frequency phase correction system and method are described that provides a receiver with a greater ability to lock onto relatively weak radio frequency signals by determining and estimating an amount of frequency error in a local frequency reference of the receiver, and using the error estimate to maintain frequency coherence with a received signal, thereby allowing tracking over a longer period of time, enabling longer integration times to capture weaker signals without losing frequency coherence.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: April 19, 2011
    Assignee: SiRF Technology Inc.
    Inventors: Daniel Babitch, Steven A. Gronemeyer, Lionel Garin, Ashutosh Pande, Leon Kuo-Liang Peng, Gengsheng Zhang, Nicolas Patrick Vantalon
  • Publication number: 20110028102
    Abstract: Methods and apparatus of using a licensed spectrum to transmit a signal when an unlicensed spectrum is congested are disclosed. One method includes receiving, at a first mobile device, a request signal from a second mobile device, receiving, at the first mobile device, a remote signal from one or more mobile devices using the unlicensed spectrum, and transmitting a control signal from the first mobile device to the second mobile device using the licensed spectrum, the control signal being based on the remote signal. The control signal carries control information that is based on at least one of a time at which the second mobile device sends a signal to the first mobile device or the received powers of the remote signal and the request signal.
    Type: Application
    Filed: July 28, 2009
    Publication date: February 3, 2011
    Applicant: QUALCOMM Incorporated
    Inventors: Junyi Li, Saurabh Tavildar, Aleksandar Jovicic, Thomas Richardson
  • Patent number: 7860474
    Abstract: A method of controlling noise in a pulse width modulation circuit includes varying a sample frequency and a range of information levels, wherein each sample within a data sample stream at the sample frequency represents a level within the range of information levels, to shift in frequency noise generated at the sample frequency during encoding of the data sample stream into pulse width modulated patterns.
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: December 28, 2010
    Assignee: Cirrus Logic, Inc.
    Inventors: Chang Yong Kang, John Laurence Melanson
  • Patent number: 7835701
    Abstract: The present invention allows multi-channel communications equipment to detect and eliminate a false interpretation of interference as a valid signal. The solution is based on the observation that the simultaneous arrival of energy on two independent channels is an impossible event. So, when such an event happens, it is a reliable signature of confusing out-of-band energy for a valid signal.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: November 16, 2010
    Assignee: Edgewater Computer Systems, Inc.
    Inventors: Manish Bhardwaj, Garret Shih
  • Patent number: 7801501
    Abstract: A method of performing a frequency correction of a radio module. Multiple samples of frequency data during a quiescent portion of the base station transmission is taken to estimate the amount of frequency correction needed. An embodiment applies the frequency data to a median filter to eliminate invalid data. Next, a new reference frequency is applied to a radio transceiver in the radio module to provide the frequency correction. If the frequency was corrected by greater than a pre-determined amount, the process performs a large shift frequency correction, including verifying that the first frequency correction was satisfactory and verifying that the radio transceiver is able to receive data after the frequency correction has been performed. If the frequency was corrected by smaller than a pre-determined amount, the process performs a small shift frequency correction, including updating a total of all frequency corrections made since a stored reference frequency was updated.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: September 21, 2010
    Assignee: Palm, Inc.
    Inventors: Kenneth Johnson, John Brown, Edward Vertatschitsch
  • Publication number: 20100178877
    Abstract: Receiver (2) sequentially switches a preset frequency change amount in stages from a large value to a small value. According to the reception side frequency change amount, the reception side frequency candidate for detecting a synchronization signal is calculated. Synchronization signal detection unit (5) detects a synchronization signal transmitted from a transmission device by using the calculated reception side frequency candidate. Moreover, transmitter (1) calculates a transmission side frequency candidate as a frequency candidate for transmitting the synchronization signal according to the largest possible frequency change amount calculated according to the bandwidth of the synchronization signal.
    Type: Application
    Filed: June 4, 2007
    Publication date: July 15, 2010
    Applicant: NEC CORPORATION
    Inventor: Mariko Matsumoto
  • Publication number: 20100159836
    Abstract: An automatic preset following system for use with portable multimedia playback devices. The system uses RDS protocols including, at a minimum, AF and PI. Apparatus include an RDS enabled FM transmitter for use with a portable multimedia playback device, the transmitter having a user interface with buttons for presetting the transmitter to broadcast a signal at preset PM frequencies, and an RDS enabled FM receiver for automatically tuning to the different preset FM frequencies entered into the RDS enabled FM transmitter.
    Type: Application
    Filed: September 5, 2007
    Publication date: June 24, 2010
    Inventors: Francis Lau, John Haggis
  • Patent number: 7570919
    Abstract: Transmitter and receiver for wireless communications with improved accuracy and stability in radio frequency control. A transmitter mixes an information-carrying signal (first signal) and a non-modulated wave signal (second signal) with a carrier signal, thereby producing a first and second radio frequency signals for radio wave transmission. A receiver mixes those two radio frequency signals to extract the original information signal. While the received radio frequency signals contain some frequency fluctuations and phase noises that have been introduced at the sending end, such unstable components ?f will cancel out at the receiving end.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: August 4, 2009
    Assignee: Fujitsu Quantum Devices Limited
    Inventors: Hiroshi Nakano, Yasutake Hirachi
  • Publication number: 20080318532
    Abstract: A transmitter for transmitting a synchronization signal for establishing synchronization, and a receiver for establishing the synchronization by detecting the synchronization signal are included, and the receiver tries to detect the synchronization signal sequentially at a frequency in which the probability that an effective frequency exists is higher to a frequency in which the existence probability is lower among a plurality of discrete frequency bands.
    Type: Application
    Filed: May 23, 2008
    Publication date: December 25, 2008
    Applicant: NEC CORPORATION
    Inventor: MARIKO MATSUMOTO
  • Patent number: 7444168
    Abstract: A portable device having a communication function composed of a plurality of LSIs operated in synchronization with a clock, such as a baseband LSI and a logic LSI such as an application processor, can synchronize the baseband LSI with the logic LSI without lowering the performance of the logic LSI.
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: October 28, 2008
    Assignee: Renesas Technology Corp.
    Inventors: Tetsuya Nakagawa, Masafumi Kunori
  • Patent number: 7436903
    Abstract: A multicarrier transmitter may transmit cyclically delayed linear combinations of two or more data streams with three or more antennas. In some embodiments, the multicarrier transmitter may transmit cyclically delayed linear combinations of three data streams with four antennas.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: October 14, 2008
    Assignee: Intel Corporation
    Inventors: Sumeet Sandhu, Minnie Ho
  • Patent number: 7379904
    Abstract: Systems and methods for obtaining an offer for a sale of a desired product or a service are provided. The method includes iteratively transmitting a first signal including a first data message using a mobile transceiver device. Each of the first data messages includes information relating to the desired product or service. The method further includes receiving at least one of the first signals having the first data message and determining whether a product or service provider has the desired product or service available for sale. Finally, the method includes transmitting a second signal including a second data message to the mobile transceiver device. The second data message includes an offer to sell the desired product or service.
    Type: Grant
    Filed: February 12, 2004
    Date of Patent: May 27, 2008
    Assignees: AT&T Delaware Intellectual Property, Inc., f/k/a BellSouth Intellectual Property Corporation
    Inventor: Steven Tischer