With Frequency Stabilization (e.g., Automatic Frequency Control) Patents (Class 455/75)
  • Patent number: 10313894
    Abstract: A beam steering antenna system for external antenna configurations for fixed and mobile communication devices is described where one or multiple beam steering antennas are integrated into a single external enclosure and where multiple enclosures containing beam steering antennas are used with a single communication device. Where multiple external enclosures are used with a single communication system such as a WLAN access point the beam steering antenna system provides an electrical means of optimizing antenna system and communication link performance as compared to mechanical means such as antenna enclosure positioning or orientation. Radiation mode selection for 2.4 GHz and 5 GHz antennas integrated into an external enclosure on a WLAN access point allows for independent optimization of the antenna systems for the two frequency bands without requiring antenna movement or positioning.
    Type: Grant
    Filed: September 19, 2016
    Date of Patent: June 4, 2019
    Assignee: Ethertronics, Inc.
    Inventors: Laurent Desclos, Abhishek Singh, Jeffrey Shamblin
  • Patent number: 10178455
    Abstract: An electronic device including a sound output module and a housing for the electronic device are provided. The electronic device includes a front case including a display unit, a rear case coupled to the front case and including a mounting space of a battery, a speaker module configured to form at least one side wall of the mounting space of the battery, and a battery cover configured to cover at least the mounting space of the battery.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: January 8, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Heecheul Moon, Jongchul Choi
  • Patent number: 10091039
    Abstract: A phase detection system includes first and second phase mixing circuits in signal communication with a signal phase adjuster module. The first mixing circuit generates a first digital modulated frequency signal based on an input signal and a first reference phase signal. The second mixing circuit generates a second digital modulated frequency signal based on the input signal and a second reference phase signal, which phase shifted with respect to the first reference phase signal. The phase detection system further includes a phase identification (ID) module in signal communication with the first mixing circuit and the second mixing circuit. The phase ID module generates a phase signal based on the first digital modulated frequency signal and the second digital modulated frequency signal. The phase signal indicates a phase of the input signal.
    Type: Grant
    Filed: March 14, 2017
    Date of Patent: October 2, 2018
    Assignee: RAYTHEON COMPANY
    Inventors: Benjamin Dolgin, Gary M. Graceffo, Andrew Kowalevicz
  • Patent number: 9692394
    Abstract: An integrated circuit comprising, a voltage regulator circuit and a programmable low power high-speed current steering logic (LPHCSL) driver circuit coupled to a common supply voltage. The voltage regulator circuit includes a native source follower transistor having a negative threshold voltage to provide more headroom for the voltage regulator to operate. The LPHCSL driver circuit includes a plurality of selectable output driver legs and a plurality of programmable resistors. The ability to use a common supply voltage and the ability to select multiple output impedance drivers reduces the die area without increasing the complexity of the integrated circuit.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: June 27, 2017
    Assignee: INTEGRATED DEVICE TECHNOLOGY, INC.
    Inventors: Vikas Agrawal, Feng Qiu
  • Patent number: 9651386
    Abstract: An apparatus and method for calculating a distance between vehicles to receive position movement information of a subject vehicle and position movement information of an object vehicle from a global positioning system and calculate a distance between the moved subject vehicle and the moved object vehicle based on a position movement distance of the subject vehicle and a position movement distance of the object vehicle at predetermined time as the sum of a vector when calculating the position movement information of the subject vehicle and the position movement information of the object vehicle over time using a dead reckoning formula.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: May 16, 2017
    Assignee: MANDO CORPORATION
    Inventor: Man-Bok Park
  • Patent number: 9615744
    Abstract: In general, this disclosure is directed to a mixer amplifier that can be utilized within a chopper stabilized instrumentation amplifier. The chopper stabilized instrumentation amplifier may be used for physiological signal sensing, impedance sensing, telemetry or other test and measurement applications. In some examples, the mixer amplifier may include a current source configured to generate a modulated current at a modulation frequency for application to a load to produce an input signal, an amplifier configured to amplify the input signal to produce an amplified signal, and a demodulator configured to demodulate the amplified signal at the modulation frequency to produce an output signal indicating an impedance of the load.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: April 11, 2017
    Assignee: Medtronic, Inc.
    Inventors: Timothy J. Denison, Wesley A. Santa
  • Patent number: 9559415
    Abstract: The disclosure discloses a method and device for realizing Specific Absorption Rate (SAR) control, in both of which phase shifters can be provided on a metal ground edge of a wireless terminal, and an induced current of the metal ground edge can be altered by applying the phase shifters, so as to reduce an antenna near field radiation characteristic of an SAR. The method and device of the disclosure can alter current phase and amplitude distribution of the metal ground without affecting the reception and transmission performance of the terminal, so as to reduce a local SAR peak value and lessen the harm of radiation to human bodies. Furthermore, the disclosure does not require any major change in a structure, circuit, and, antenna of a designed model, and can save space. The disclosure bears great flexibility and adaptability in an application, thereby realizing the objective of miniaturized design of the wireless terminal.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: January 31, 2017
    Assignee: ZTE CORPORATION
    Inventor: Lu Zhang
  • Patent number: 9479214
    Abstract: A wideband radio frequency (RF) interference cancellation system includes an electronic channel canceller configured to split an electronic reference signal output from an electronic transmitting element into a plurality of band signals. At least one electronic band pass filter is configured to receive a respective band signal delivered to a respective channel. The wideband RF interference cancellation system further includes at least one electronic tunable cancellation element configured to tune the respective channel such that reflections are canceled before being input to receiving element.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: October 25, 2016
    Assignee: RAYTHEON COMPANY
    Inventors: Kenneth M. Webb, Charles A. Hall, Tina P. Srivastava, Anthony T. McDowell
  • Patent number: 9231650
    Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for identifying a spectral region in a radio frequency spectrum for initiating a communication session having a transmission link and a reception link, determining a correlation factor from signals measured in the spectral region, detecting according to the correlation factor a foreign communication signal in the spectral region, generating coefficient data to prevent interference with the foreign communication signal while transmitting in the transmission link, filtering a first signal for transmission in the transmission link according to the coefficient data to generate a filtered signal, and causing a transmission of the filtered signal which prevents interference with the foreign communication signal while transmitting in the transmission link. Other embodiments are disclosed.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: January 5, 2016
    Assignee: ISCO INTERNATIONAL, LLC
    Inventors: Amr Abdelmonem, Sean S. Cordone
  • Patent number: 9160386
    Abstract: Systems and methods are disclosed to implement non-linear interference cancellation (NLIC) across chips or dies in communication systems to cancel or mitigate self-jamming interference. A victim transceiver may receive an analog baseband transmit (Tx) signal from an aggressor transceiver. The analog baseband Tx signal may be tapped from a digital analog converter (DAC) of the aggressor transceiver. Alternatively, the analog baseband Tx signal may be generated by the aggressor transceiver using an auxiliary down-conversion and filtering stage. The victim transceiver may receive a composite baseband Rx signal from the victim transceiver front-end. The composite baseband Rx signal includes the desired Rx signal and an interference signal. The victim transceiver may sample the analog baseband Tx signal to generate a digital signal replica of the analog baseband Tx signal for the NLIC operation to cancel or mitigate the interference signal present in the composite baseband Rx signal.
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: October 13, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Roberto Rimini, Jibing Wang, Geert Arnout Awater
  • Patent number: 9154278
    Abstract: A mobile communications device having an LTE radio technology and at least one other technology (for example, Bluetooth or Wi-Fi) determines whether transmissions using the other radio technology causes, or is likely to cause interference in reception of LTE signals. If such interference exists or is likely, then a signal indicating interference is sent to the LTE base station, which can take action to try to mitigate or prevent such interference. The mobile communications device can have a timer so that the interference indicating signal is only sent periodically, either at regular intervals, or whenever the interference is determined to exist after the timer period has expired. In some cases, a signal indicating that the interference level has reduced can be sent, again either at regular intervals, to whenever the interference level changes.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: October 6, 2015
    Assignee: NEC CORPORATION
    Inventor: Vivek Sharma
  • Patent number: 9031516
    Abstract: A transceiver includes an antenna, an impedance adjustment device, an RF (Radio Frequency) front-end circuit, a storage device, and a processor. The antenna receives an RF signal. The impedance adjustment device is coupled to the antenna, and includes a plurality of branch circuit with different impedance values and a switch module. The processor is coupled to the RF front-end circuit and controls the switch modules. In a comparison mode, the switch module selects to connect to the branch circuits individually, and the processor detects each RSSI (Received Signal Strength Indications) value corresponding to the branch circuit and records all of the RSSI values to the storage device respectively. In the comparison mode, the processor further compares the RSSI values to for highest one. Finally, the switch module selects the branch circuit corresponding to the highest RSSI value as a transmission branch.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: May 12, 2015
    Assignee: Accton Technology Corporation
    Inventor: Wen-Chi Wang
  • Publication number: 20150118972
    Abstract: A system that incorporates the subject disclosure may include, for example, a circuit for measuring from a near field sensor a first signal representing radiated energy from an antenna structure, measuring from a probe a second signal supplied to the antenna structure, determining a phase differential from a first phase of the first signal and a second phase of the second signal, detecting a frequency offset of the antenna structure based on the phase differential, and adjusting an operating frequency of the antenna structure to mitigate the frequency offset. Other embodiments are disclosed.
    Type: Application
    Filed: April 30, 2014
    Publication date: April 30, 2015
    Applicant: Skycross, Inc.
    Inventors: Mark T. Montgomery, Frank M. Caimi, Duane Rabe
  • Publication number: 20150118973
    Abstract: A system that incorporates the subject disclosure may include, for example, a circuit for determining a magnitude difference between a first signal supplied to an antenna and a second signal radiated by the antenna, determining a phase difference between the first signal supplied to the antenna and the second signal radiated by the antenna, detecting an offset in an operating frequency of the antenna based on the magnitude difference and the phase difference, and adjusting the operating frequency of the antenna to mitigate the offset in the operating frequency of the antenna. Other embodiments are disclosed.
    Type: Application
    Filed: April 30, 2014
    Publication date: April 30, 2015
    Applicant: Skycross, Inc.
    Inventors: Mark T. Montgomery, Frank M. Caimi, Duane Rabe, Li Chen, Mark W. Kishler
  • Publication number: 20150118974
    Abstract: A system that incorporates the subject disclosure may include, for example, a circuit for obtaining a desired bandwidth of operation of the antenna structure, adjusting a bandwidth of the antenna to achieve the desired bandwidth of operation of the antenna structure, and tuning the antenna to a new resonant frequency to accommodate transmitting or receiving RF signals at a desired band of operation. The antenna at the new resonant frequency is at least approximately at the desired bandwidth of operation of the antenna structure. Other embodiments are disclosed.
    Type: Application
    Filed: August 25, 2014
    Publication date: April 30, 2015
    Inventors: Mark T. Montgomery, Frank M. Caimi
  • Patent number: 8982974
    Abstract: Receiver synchronization techniques (RST), contributing more accurate synchronization of receiver clock to OFDM composite frame combined with much faster acquisition time and better stability of the receiver clock, and phase and frequency recovery techniques, comprising a software controlled clock synthesizer (SCCS) for high accuracy phase & frequency synthesis producing synchronized low jitter clock from external time referencing signals or time referencing messages wherein SCCS includes a hybrid PLL (HPLL) enabling 1-50,000 frequency multiplication with very low output jitter independent of reference clock quality.
    Type: Grant
    Filed: February 10, 2013
    Date of Patent: March 17, 2015
    Inventor: John W Bogdan
  • Patent number: 8983403
    Abstract: A frequency compensation device, applicable to a user equipment (UE) communicating with a first base station (BS), includes a receiving module and a transmitting module. The receiving module has an offset detection unit for performing following steps. A first signal from the first BS at a first receiving frequency is received. A first transmitting frequency where the first BS transmits the at least one first signal is read. A difference between the first transmitting frequency and the first receiving frequency is calculated and used as a frequency difference. The transmitting module is for performing following steps. A BS parameter corresponding to the first BS is obtained. A frequency compensation value according to the BS parameter is calculated. A second transmitting frequency according to the frequency compensation value corresponding to the first BS is compensated. A second signal to the first BS at the compensated second transmitting frequency is sent.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: March 17, 2015
    Assignee: Gemtek Technology Co., Ltd.
    Inventors: Fu-Ming Yeh, You-Chang Shih
  • Patent number: 8938238
    Abstract: Transmissions by a first access point (e.g., a femto cell) are restricted upon detecting an access terminal in the vicinity of the first access point in the event the access terminal is communicating with a second access point (e.g., a macro cell). Upon detection of such an access terminal, the access terminal restricts transmission (e.g., beacon transmission) on a downlink carrier frequency on which the access terminal is actively receiving information from the second access point. This restriction of transmission by the access point may involve, for example, temporarily reducing transmit power, reducing the periodicity of transmission, or ceasing transmission.
    Type: Grant
    Filed: November 2, 2010
    Date of Patent: January 20, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Mehmet Yavuz, Leonard Henry Grokop, Chirag Sureshbhai Patel, Sanjiv Nanda
  • Patent number: 8934853
    Abstract: Embodiments of the present disclosure use shared oscillator for cellular communications and location detection in a communication device. The communications device estimates a frequency offset of one of its subsystems. The communications device determines a frequency offset that results from drifting of this shared oscillator, typically caused by aging and/or changes in temperature, voltage, humidity, pressure, and/or vibration to provide some examples, from the frequency offset this subsystem. The communications device provides various compensation parameters to its various subsystems to compensate for the frequency offset that results from drifting of the oscillator.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: January 13, 2015
    Assignee: Broadcom Corporation
    Inventors: Robert Lorenz, Kamesh Medapalli, Frank Van Diggelen, Charlie Abraham
  • Publication number: 20150004919
    Abstract: An analog phase-locked loop, PLL, (100, 200) is disclosed, comprising a voltage controlled oscillator (102, 202); a frequency divider (104, 204) having its input connected to an output of the VCO; a first phase detector (106, 206) arranged to detect a phase difference between an output signal of the frequency divider and a reference frequency signal and provide an output signal based on the phase difference, wherein the detectable phase difference is within one cycle of the reference frequency; a first charge pump (108, 208) connected to an output of the first phase detector and arranged to divider output a charge per detected phase error based on the output of the first phase detector; and an analog loop filter (110, 210) connected to the first charge pump and arranged to provide a voltage, based on the output of the first charge pump, to the VCO.
    Type: Application
    Filed: November 14, 2012
    Publication date: January 1, 2015
    Inventor: Staffan Ek
  • Patent number: 8923778
    Abstract: A method and system provides an automatic frequency correction (AFC) within a wireless communication device. A synchronization controller estimates first and second frequency errors respectively associated with a first received signal corresponding to a first receiver path and a second received signal corresponding to a second receiver path. The synchronization controller determines a value and a type of target clock of a first AFC associated with the first frequency error. If the first AFC is not generated to target a shared clock such as a reference clock, the synchronization controller generates a second AFC to compensate for the second frequency error. However, if it is determined that the first AFC targets a shared clock, the synchronization controller generates the second AFC to compensate for the first AFC and the second frequency error. The synchronization controller synchronously applies the first and second AFCs to the relevant clocks.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: December 30, 2014
    Assignee: Google Technology Holdings LLC
    Inventors: Armin W. Klomsdorf, William P. Alberth, Jr., Gregory R. Black
  • Publication number: 20140378073
    Abstract: A method may include measuring a frequency difference between an actual frequency and an expected frequency associated with a frequency control calibration signal value for each of a plurality of frequency control calibration signal values during a calibration phase. The method may additionally include generating integral non-linearity compensation values based on the frequency differences measured. The method may further include generating the applied frequency control signal based on a frequency control calibration signal value received by the digital-to-analog converter during the calibration phase. The method may also include generating a compensated frequency control signal value based on a frequency control signal value received by the integral non-linearity compensation module and an integral non-linearity compensation value associated with the frequency control signal value during an operation phase of the wireless communication element.
    Type: Application
    Filed: September 5, 2014
    Publication date: December 25, 2014
    Inventors: David Harnishfeger, Kris K. Kaufman
  • Patent number: 8903314
    Abstract: Interference from other wireless technology co-resident on a Bluetooth-capable device may render one or more Bluetooth frequencies unusable for a Bluetooth introduction sequence. In this case, one or more usable frequencies may be substituted for the one or more unusable frequencies to permit the introduction sequence to proceed. The one or more usable frequencies may be selected from a known set of usable frequencies in the current Bluetooth frequency train. Alternatively, a frequency re-mapping process may be used to select the one or more usable frequencies from the current Bluetooth frequency train.
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: December 2, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Joel Linsky
  • Patent number: 8903322
    Abstract: A wireless communication device includes a central processing unit (CPU), a sensor electrically connected to the CPU, an antenna module, and a matching circuit electrically connected between the CPU and the antenna module. In response to a call being made by the wireless communication device and in response to detection of an external object within a predetermined range of the wireless communication device by the sensor, the sensor transmits a signal to trigger the CPU to generate a control signal. The matching circuit receives the signal from the CPU and shifts the resonant frequency of the antenna module down.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: December 2, 2014
    Assignees: Shenzhen Futaihong Precision Industry Co., Ltd., Chi Mei Communication Systems, Inc.
    Inventor: Xiao-Dong Wang
  • Publication number: 20140349592
    Abstract: A wireless circuit that can be used in a plurality of frequency bands even if its duplexer is formed of current variable frequency filters is provided. The circuit includes a transmission-reception antenna 911, a variable frequency duplexer 131, a double-pole six-throw switch 923, an RFIC 180, and a controller 190 which executes switching operations in accordance with control signals. The RFIC 180 determines a pair of frequency bands for transmission and reception signals input to the variable frequency duplexer 131 and generates and sends the control signals to perform switching control operations to connect a transmission port corresponding to the determined transmission frequency band with the transmission terminal of the variable frequency duplexer 131 and to connect a reception port corresponding to the determined reception frequency band with the reception terminal of the variable frequency duplexer 131 and to perform a frequency switching operation of the variable frequency duplexer 131.
    Type: Application
    Filed: July 10, 2013
    Publication date: November 27, 2014
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroshi Okazaki, Kunihiro Kawai, Shoichi Narahashi, Yuta Takagi, Takayuki Furuta
  • Publication number: 20140329474
    Abstract: A computing device with a configurable antenna. The antenna is configured through a switching circuit operating under software control. Operating characteristics of the antenna are configured based on connections between conducting segments established by the switching circuit, allowing the nominal frequency, bandwidth or other characteristics of the antenna to be configured. Because the switching is software controlled, the configurable antenna may be integrated with a software defined radio. The radio and antenna can be reconfigured to support communication according to different wireless technologies at different times or to interleave packets according to different wireless technologies to support concurrent sessions using different wireless technologies.
    Type: Application
    Filed: July 22, 2014
    Publication date: November 6, 2014
    Inventors: Amer A. Hassan, Christian Huitema
  • Patent number: 8874057
    Abstract: According to one embodiment, a compact low-power receiver comprises a front-end producing a front-end gain and a back-end producing a back-end gain. The front-end includes a transconductance amplifier providing digital gain control and outputting an amplified receive signal, a mixer for generating a down-converted signal from the amplified receive signal, and a transimpedance amplifier (TIA) including a current mode buffer. The TIA provides gain control for amplifying the down-converted signal to produce a front-end output signal. In one embodiment, the back end includes a second-order low-pass filter to produce a filtered signal from the front-end output signal and an analog-to-digital converter (ADC), wherein the filtered signal is fed directly to the ADC without direct-current (DC) offset cancellation being performed. In various embodiments, the front-end gain is substantially greater than the back-end gain.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: October 28, 2014
    Assignee: Broadcom Corporation
    Inventors: Mohyee Mikhemar, Hooman Darabi, Masoud Kahrizi
  • Publication number: 20140295777
    Abstract: A transceiver includes an antenna, an impedance adjustment device, an RF (Radio Frequency) front-end circuit, a storage device, and a processor. The antenna receives an RF signal. The impedance adjustment device is coupled to the antenna, and includes a plurality of branch circuit with different impedance values and a switch module. The processor is coupled to the RF front-end circuit and controls the switch modules. In a comparison mode, the switch module selects to connect to the branch circuits individually, and the processor detects each RSSI (Received Signal Strength Indications) value corresponding to the branch circuit and records all of the RSSI values to the storage device respectively. In the comparison mode, the processor further compares the RSSI values to for highest one. Finally, the switch module selects the branch circuit corresponding to the highest RSSI value as a transmission branch.
    Type: Application
    Filed: August 2, 2013
    Publication date: October 2, 2014
    Applicant: Accton Technology Corporation
    Inventor: Wen-Chi WANG
  • Patent number: 8843081
    Abstract: A receiver with transmit (TX) signal cancellation is disclosed. In an exemplary design, an apparatus includes an adjustment circuit, a transformer (e.g., a balun), and a low noise amplifier (LNA). The adjustment circuit receives a version of a TX signal and provides an adjusted TX signal, which may have adjustable amplitude and/or phase. The transformer receives the adjusted TX signal and a receive (RX) signal including a leaked TX signal, attenuates the leaked TX signal in the RX signal based on the adjusted TX signal, and provides an output RX signal. The TX signal may be transmitted via a primary antenna, and the RX signal may be received via a diversity antenna. The LNA receives the output RX signal and provides an amplified RX signal. The adjustment circuit detects remaining TX signal in the amplified RX signal and adjusts the amplitude and/or phase of the adjusted TX signal to reduce the remaining TX signal.
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: September 23, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Gurkanwal Singh Sahota
  • Patent number: 8831533
    Abstract: An apparatus and method for non-calibrated Automatic Frequency Correction (AFC) of a portable terminal are provided. The method includes identifying, by the portable terminal, signal strengths of signals received from neighboring base stations of a cell in which the portable terminal is currently located; searching for a frequency burst serving that provides synchronization acquisition information for synchronization with a base station; determining to perform the AFC according to a result of the searching for the frequency burst; and storing AFC data extracted through the AFC.
    Type: Grant
    Filed: January 13, 2012
    Date of Patent: September 9, 2014
    Assignee: Samsung Electronics Co., Ltd
    Inventors: In-Tae Jun, Young-Nam Cho, Ho-Nam Kim, Jae-Young Roh, Jae-Young Yun
  • Patent number: 8831147
    Abstract: A desired signal and interfering signal are transmitted in the same timeslot and on the same frequency using an Adaptive Quadrature Phase Shift Keying (AQPSK) modulated carrier. When the Sub-Channel Power Imbalance Ratio (SCPIR) for the AQPSK modulated carrier is large and favors the interfering signal, the interfering signal is demodulated first to obtain demodulated soft bits. The demodulated soft bits corresponding to the interfering signal are then used to estimate receiver control parameters, such as Doppler shift, frequency offset, timing error, gain, etc. Using the demodulated soft bits corresponding to the interfering signal improves the accuracy of the receiver control parameters when the SCPIR is large, and results in better overall performance of the receiver.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: September 9, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Naveen Jacob, Amit Singhal
  • Patent number: 8787963
    Abstract: According to one embodiment, a mobile wireless terminal apparatus includes a first communication module, a second communication module, and a controller. The first communication module is configured to detect a beacon signal from a wireless signal transmitted from the base station to a service area, and to determine movement into a new service area and movement to an outside of the service area, based on a variation of a reception timing of the beacon signal. The second communication module is configured to receive a wireless signal transmitted from the base station and to communicate with the base station by acquiring identification information of the base station from the wireless signal. The controller is configured to activate the second communication module and cause the second communication module to acquire the identification information, when the movement to the new service area is determined by the first communication module.
    Type: Grant
    Filed: September 26, 2011
    Date of Patent: July 22, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kengo Kurose, Yuki Hayashi
  • Patent number: 8774067
    Abstract: There are first and second antennas proximally disposed and configured to resonate within respective first and second frequency bands, which may overlap. An impedance stabilization circuitry is coupled to ground. There is a selective coupler (for example, diplexer, directional coupler, switch) interfacing the second antenna selectively with the impedance stabilization circuitry and with radio circuitry. The selective coupler comprises a first port coupled to the second antenna, a second port coupled to the impedance stabilization circuitry, and a third port configured to couple with radio circuitry that is configured to operate in the second frequency band. The selective coupler provides a predetermined impedance to signals within the first frequency band and a low insertion loss to signals within the second frequency band, thus providing a stable impedance for the first antenna's view of the second antenna.
    Type: Grant
    Filed: November 17, 2009
    Date of Patent: July 8, 2014
    Assignee: Nokia Corporation
    Inventors: Seppo O. Rousu, Marko E. Leinonen, Juha P. Valtanen
  • 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: 8742798
    Abstract: A circuit includes an oscillation generation circuit, a distribution circuit, and a transceiver circuit. The oscillation generation circuit is configured to generate a first oscillation signal having a first frequency. The distribution circuit includes a voltage to current stage, a transmission portion and a current to voltage stage. The voltage to current stage is configured to receive the first oscillation signal, and convert the first oscillation signal into a current form. The transmission portion is configured to transmit the first oscillation signal in the current form. The current to voltage stage is configured to receive the first oscillation signal in the current form and generate a second oscillation signal having a sub-harmonic frequency of the first frequency, such as half of the first frequency. The transceiver circuit is configured to operate in a frequency band responsive to the second oscillation signal.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: June 3, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Himanshu Arora, Paolo Rossi, Jae Yong Kim
  • Patent number: 8706051
    Abstract: Provided is a device and a method for adjusting a loop filter gain in an automatic frequency controller, which can allow the automatic frequency controller to operate while maintaining an optimal performance. The device includes a velocity estimator for estimating a change in velocity in accordance with a movement of a terminal; a loop filter gain controller for controlling a loop filter gain in accordance with a change in velocity received from the velocity estimator; and a loop filter gain unit for multiplying a loop filter gain received from the loop filter gain controller and a frequency error for output. Further, there is provided a method for adjusting a loop filter gain in an automatic frequency controller, having the steps of: estimating a change in velocity in accordance with a movement of a terminal; adjusting a loop filter gain in accordance with the estimated change in velocity; and multiplying the adjusted loop filter value and a frequency error for output.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: April 22, 2014
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Soo-Jin Park, Chae-Man Lim
  • Patent number: 8665038
    Abstract: A filtering circuit with BAW type acoustic resonators having at least a first quadripole and a second quadripole connected in cascade, each quadripole having a branch series with a first acoustic resonator of type BAW and a branch parallel with each branch having an acoustic resonator of type BAW, the first acoustic resonator having a frequency of resonance series approximately equal to the frequency of parallel resonance of the second acoustic resonator, the branch parallel of the first quadripole having a first capacitance connected in series with the second resonator and, in parallel with the capacitance, a first switching transistor to short circuit the capacitance.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: March 4, 2014
    Assignees: STMicroelectronics S.A., Centre National de la Recherche Scientifique
    Inventors: Didier Belot, Alexandre Augusto Shirakawa, Eric Kerherve, Moustapha El Hassan, Yann Deval
  • Patent number: 8666327
    Abstract: A method and device for frequency deviation pre-correction are provided. The method includes: estimating an uplink frequency deviation value of a terminal, and obtaining a historic value of the uplink frequency deviation pre-correction that has been used for the frequency deviation pre-correction of the terminal; according to the historic value of the uplink frequency deviation pre-correction, determining a current value of the uplink frequency deviation pre-correction of the terminal, the current value of the uplink frequency deviation pre-correction being closer to the uplink frequency deviation value than the historic value of the uplink frequency deviation pre-correction; by using the current value of the uplink frequency deviation pre-correction, pre-correcting the frequency deviation of the terminal, thereby the signal detection performance of the terminal can be effectively improved.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: March 4, 2014
    Assignee: China Academy of Telecommunications Technology
    Inventors: Dongsheng Sang, Yuemin Cai, Xiangqian Zhu, Haijun Zhou
  • Publication number: 20140051366
    Abstract: A method and system provides an automatic frequency correction (AFC) within a wireless communication device. A synchronization controller estimates first and second frequency errors respectively associated with a first received signal corresponding to a first receiver path and a second received signal corresponding to a second receiver path. The synchronization controller determines a value and a type of target clock of a first AFC associated with the first frequency error. If the first AFC is not generated to target a shared clock such as a reference clock, the synchronization controller generates a second AFC to compensate for the second frequency error. However, if it is determined that the first AFC targets a shared clock, the synchronization controller generates the second AFC to compensate for the first AFC and the second frequency error. The synchronization controller synchronously applies the first and second AFCs to the relevant clocks.
    Type: Application
    Filed: August 20, 2012
    Publication date: February 20, 2014
    Applicant: MOTOROLA MOBILITY LLC
    Inventors: Armin W. Klomsdorf, William P. Alberth, JR., Gregory R. Black
  • Publication number: 20140030986
    Abstract: An activated contactless communication circuit includes a device for receiving and transmitting a data-carrying electromagnetic field; a first circuit resonating with a first antenna for receiving data; and a second circuit resonating with a second antenna for transmitting data, the first and second resonating circuits being separate from each other. The transmission is carried out at a frequency phase-synchronized with the frequency of the electromagnetic field for reception.
    Type: Application
    Filed: April 12, 2012
    Publication date: January 30, 2014
    Applicant: Gemalto SA
    Inventors: Jean-Paul Caruana, Christophe Buton, Grégory Capomaggio
  • Patent number: 8634510
    Abstract: A bang-bang frequency detector with no data pattern dependency is provided. In examples, the detector recovers a clock from received data, such as data having a non-return to zero (NRZ) format. A first bang-bang phase detector (BBPD) provides first phase information about a phase difference between a sample clock and the clock embedded in the received data. A second BBPD provides second phase information about a second phase difference between the clock embedded in the received data and a delayed version of the sample clock. A frequency difference between the sample clock and the clock embedded in the received data is determined based on the first and second phase differences. The frequency difference can be used to adjust the frequency of the sample clock. A lock detector can be coupled to a BBPD output to determine if the sample clock is locked to the clock embedded in the received data.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: January 21, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Xiaohua Kong, Vannam Dang, Tirdad Sowlati
  • Patent number: 8634506
    Abstract: Generate a series of digital data according to a pair of differential signals received from a low speed universal serial bus. Calibrate coarsely a frequency of an oscillator according to a width of an end-of-packet of the series of digital data. And calibrate finely the frequency of the oscillator according to a width of a SYNC pattern of the series of digital data.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: January 21, 2014
    Assignee: Weltrend Semiconductor Inc.
    Inventors: Fu-Yuan Hsiao, Ke-Ning Pan
  • Publication number: 20140011460
    Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for comparing a received signal from a first antenna to a reference signal transmitted by a second antenna, determining from the comparison one or more compensation parameters, and tuning a compensation circuit according to the one or more compensation parameters, where the one or more compensations parameters configure the compensation circuit to reduce mutual coupling between the first and second antennas. Other embodiments are disclosed.
    Type: Application
    Filed: July 6, 2012
    Publication date: January 9, 2014
    Applicant: Research in Motion Limited
    Inventors: Shirook M. Ali, John Bradley Deforge
  • Patent number: 8619914
    Abstract: Provided are a receiver and a receiving method for a scalable bandwidth in a mobile station of an Orthogonal Frequency Division Multiplexing (OFDM) system. The receiving method includes the steps of: (a) filtering a received RF signal; (b) oscillating a frequency according to a center frequency control signal to output a local oscillation frequency; (c) down-converting the filtered RF signal by using the local oscillation frequency; (d) scalable-filtering the down-converted signal while adjusting a bandwidth according to a bandwidth control signal; (e) controlling gain of the scalable-filtered signal; (f) converting the gain-controlled analog signal into a digital signal by using a sampling frequency matching with a corresponding bandwidth according to an ADC control signal; and (g) demodulating the converted digital signal, outputting the center frequency control signal, the bandwidth control signal, and the ADC control signal according to control information received from an upper layer.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: December 31, 2013
    Assignees: Electronics and Telecommunications Research Institute, Samsung Electronics Co., Ltd.
    Inventors: Moon-Sik Lee, Nam-Il Kim, Hyeong-Geun Park, Il-Gyu Kim, Young-Hoon Kim, Seung-Chan Bang
  • Publication number: 20130316661
    Abstract: A transceiver may include a reception (Rx) radio frequency (RF) part configured to process a received signal, a transmission (Tx) RF part configured to process a transmitted signal, and a phase lock loop (PLL) configured to provide a reception frequency to the reception RF part and provide a transmission frequency to the transmission RF part. The PLL may be controlled according to whether the reception RF part or the transmission RF part is on. In addition, a transceiver may include quenching waveform generator (QWGs) to control quenching waveforms of the RF parts corresponding to a plurality of antennas. The quenching waveforms may be generated respectively by VCOs operating at a same frequency. The QWGs may control the VCOs such that the quenching waveforms do not overlap.
    Type: Application
    Filed: May 10, 2013
    Publication date: November 28, 2013
    Applicants: Sungkyunkwan University Foundation for Corporate Collaboration, Samsung Electronics Co., Ltd.
    Inventors: Jaesup LEE, Hong Jin KIM, Hyung Gu PARK, Kang Yoon LEE
  • Patent number: 8594644
    Abstract: A device and method for executing a reserved function using time information extracted from a broadcasting data that provides a correct time in asynchronous mobile communication terminal are provided. The method of executing a reserved function in a mobile communication terminal includes: when a broadcasting function is executed, performing (1) extracting a time information from received broadcasting data, (2) calculating a time difference between a time of the extracted time information and a corresponding operating time of the mobile communication terminal, and (3) storing the calculated time difference as a time difference information; and if a reservation time for executing a specific function is set and when the operating time reaches the set reservation time based on the stored time difference information, executing the specific function.
    Type: Grant
    Filed: November 28, 2007
    Date of Patent: November 26, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chung Kyu Lee, Hyun Woo Kim, Young Jun Jung, Ho Kwon Song, Jeong Wook Seo
  • Patent number: 8594608
    Abstract: A synthesizer includes a synthesizer unit for generating a local oscillation signal based on a reference oscillation signal output from a reference oscillation unit including a MEMS resonator, a frequency fluctuation detector for detecting a frequency fluctuation of the MEMS resonator, and a frequency adjuster for adjusting a frequency of the local oscillation signal based on the frequency fluctuation detected by the frequency fluctuation detector. This synthesizer can output a signal with a stable frequency, even when an MEMS resonator demonstrating a large fluctuation in an oscillation frequency to temperatures is used.
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: November 26, 2013
    Assignee: Panasonic Corporation
    Inventors: Akihiko Namba, Yasunobu Tsukio
  • Patent number: 8588707
    Abstract: The present disclosure relates to methods, systems and devices for shifting a reference frequency from a first value to a second value, the shifting characterized at least in part by a controlled transition of the reference frequency at a predetermined time-rate-of-change.
    Type: Grant
    Filed: February 14, 2008
    Date of Patent: November 19, 2013
    Assignee: Intel Mobile Communications GmbH
    Inventor: Michael Meixner
  • Patent number: 8588708
    Abstract: According to an embodiment, a communication device of the embodiment includes: a reference frequency generating unit configured to generate a reference frequency having a deviation from center frequency deviation under a predetermined condition, a radio signal detection unit configured to operate in a detection period based on the reference frequency and detect a periodic radio signal generated based on a reference frequency having higher precision than the precision of the reference frequency. The radio signal detection unit corrects the detection period by using the periodic signal.
    Type: Grant
    Filed: September 8, 2010
    Date of Patent: November 19, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takashi Minemura, Kengo Kurose
  • Patent number: 8588774
    Abstract: A technique for cell-identity detection is provided. In one method embodiment, at least one cell-identity in a cellular telecommunication network is determined. The method comprises the steps of receiving a synchronization signal, calculating first correlations and second correlations as well as determining the at least one cell-identity. The received synchronization signal includes a first partial signal and a second partial signal. The first correlations are calculated between the first partial signal and first reference signals, each of which indicates one or more first cell-identities. The second correlations are calculated between the second partial signal and second reference signals, each of which indicates one or more cell-identities out of the first cell-identities. The second reference signals are selected depending on the first correlations. The cell-identity is determined based on the second correlations. The complexity for cell-identity detection is reduced by the technique.
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: November 19, 2013
    Assignee: Unwired Planet, LLC
    Inventors: Oliver Klein, Karsten Brüninghaus