Carrier Frequency Stabilization Patents (Class 455/119)
  • Patent number: 10238288
    Abstract: A wearable radio frequency receiver device is provided, which includes a receiver antenna configured to receive an interrogation signal from a transmitter. The receiver device further includes a sensor coupled to the receiver antenna and configured to receive a physiological input from a user wearing the device and generate a sensor signal based on the physiological input, and a modulator configured to perform direct modulation on the received interrogation signal based on the sensor signal to encode the physiological input in the directly modulated interrogation signal. The receiver antenna may be configured to reflect at least a portion of the directly modulated interrogation signal as backscatter radiation. A transceiver including a transceiver antenna may be provided to receive the directly modulated interrogation signal, and the modulation receiver may be configured to process the directly modulated interrogation signal and output a decoded physiological input.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: March 26, 2019
    Assignee: MICROSOFT TECHNOLOGY LICENSING, LLC
    Inventors: Sidhant Gupta, Jonathan Lester, Vaishnavi Nattar Ranganathan
  • Patent number: 9992748
    Abstract: A communication device (device) includes a communication interface and a processor, among other possible circuitries, components, elements, etc. to support communications with other device(s) and to generate and process signals for such communications. The device receives a ranging instruction signal, which includes an initial power and at least one power step, from another device. The device processes the ranging instruction generates a first ranging signal based on the initial power. The device then transmits the first ranging signal to the another device. When a ranging response to the first ranging signal is received from the another device, the device determines that the device is successfully ranged to the another device. Alternatively, when no ranging response is received, the device generates a second ranging signal based on the initial power and the at least one power step and transmit the second ranging signal to the another device.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: June 5, 2018
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Avraham Kliger, Anatoli Shindler
  • Patent number: 9872265
    Abstract: Systems and methods related to time and frequency synchronization of a base station in a cellular communications network are disclosed. In some embodiments, a method of operation of a synchronizing base station comprises selecting a first base station for frequency synchronization and a second base station for time synchronization, where the second base station can be different than the first base station selected for frequency synchronization. The method further comprises performing frequency synchronization using a signal transmitted from a radio interface of the first base station and performing time synchronization using a signal transmitted from a radio interface of the second base station. In this manner, the synchronizing base station is enabled to independently select the first and second base stations used for frequency and time synchronization, respectively.
    Type: Grant
    Filed: November 14, 2016
    Date of Patent: January 16, 2018
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Havish Koorapaty, Daniel Larsson
  • Patent number: 9526081
    Abstract: Systems and methods related to time and frequency synchronization of a base station in a cellular communications network are disclosed. In some embodiments, a method of operation of a synchronizing base station comprises selecting a first base station for frequency synchronization and a second base station for time synchronization, where the second base station can be different than the first base station selected for frequency synchronization. The method further comprises performing frequency synchronization using a signal transmitted from a radio interface of the first base station and performing time synchronization using a signal transmitted from a radio interface of the second base station. In this manner, the synchronizing base station is enabled to independently select the first and second base stations used for frequency and time synchronization, respectively.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: December 20, 2016
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Havish Koorapaty, Daniel Larsson
  • Patent number: 9094809
    Abstract: A technique for managing activity states of at least two subscriptions in a terminal device is described. A method implementation of this technique performed in the terminal device comprises the steps of monitoring whether a first subscription is to transit or has transit from a first active state to a second active state while at least one second subscription is in a detached state, wherein the second active state is associated with a lower terminal activity than the first active state, if the result of the monitoring step is affirmative, waiting for a predetermined period of time, upon elapse of the predetermined period of time, if the first subscription is still in the second active state, triggering a transition of the first subscription from the second active state to an inactive state and initiating for the at least one second subscription a transition from a detached state to an inactive state.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: July 28, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Bengt Lindoff, Bo Lincoln, Johan Nilsson, Christer Östberg
  • Publication number: 20150126127
    Abstract: A carrier frequency offset calibration method and a carrier frequency offset calibration system are provided. The carrier frequency offset calibration method is adapted to calibrate the carrier frequency offsets of a transmission signal which includes a primary carrier and a secondary carrier. In the carrier frequency offset calibration method, the transmission signal is analyzed according to known carrier frequencies, a primary feedback value and a secondary feedback value, so as to obtain a primary carrier offset value and a secondary carrier offset value. The relationship between the primary carrier offset value and the secondary offset value is considered to determine whether to adjust the primary feedback signal and the secondary feedback signal.
    Type: Application
    Filed: January 16, 2014
    Publication date: May 7, 2015
    Applicant: Novatek Microelectronics Corp.
    Inventor: Yuan-Hau Yang
  • 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: 8970343
    Abstract: A method for teaching a switching circuit is provided. The method includes presenting a target within a sensing range of a sensor of the switching circuit for a pre-determined duration and acquiring an identification code of the target via the sensor. The method also includes storing the acquired identification code for operating the switching circuit and locking the switching circuit against learning identification codes of any other target prior to reaching an allowed number of reteaching attempts.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: March 3, 2015
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Wayne R. Foster, Joshua D. Vavra, Steven R. Tambeau
  • Patent number: 8954008
    Abstract: A medical device communication system transmitter may include a resonator coupled to a local oscillator for stabilizing an operating frequency of the local oscillator. A control device of the transmitter receives an open-loop control signal, and the local oscillator and the control device are configured to generate a direct modulated radio frequency transmission signal in response to the open-loop control signal.
    Type: Grant
    Filed: January 29, 2013
    Date of Patent: February 10, 2015
    Assignee: Medtronic, Inc.
    Inventors: Yu Wang, George C. Rosar
  • Patent number: 8843087
    Abstract: A multichannel combiner formed from 2 to 1 combiners, wherein: a first input channel of each 2 to 1 combiner is connected to the output of a settable-gain amplifier of a signal to be combined; all 2 to 1 combiners are electrically connected in series; and an output of a first 2 to 1 combiner defines an output of the multichannel combiner.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: September 23, 2014
    Assignee: STMicroelectronics SA
    Inventors: Baudouin Martineau, Olivier Richard, Frédérìc Gianesello
  • 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: 8811919
    Abstract: Apparatus for generating a first signal (e.g., a pulse) including a current source adapted to generate a current based on a second signal that defines an amplitude of the current and a third signal that defines the timing of an amplitude change of the current, and an impedance element through which the current flows to generate the first signal. The impedance element may comprise a resonator having a resonant frequency approximate the center of the first signal frequency spectrum. An LO may be used to generate the third signal to control the timing of the amplitude change of the current. A detector may enable the current source in response to detecting a defined steady-state condition of the LO clock signal, and may disable the current source in response to the completion of the first signal. A controller may generate the second signal to control the current amplitude so as to perform power control and/or other functions.
    Type: Grant
    Filed: September 11, 2009
    Date of Patent: August 19, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Anthony F. Segoria, Jorge A. Garcia
  • Patent number: 8798558
    Abstract: Disclosed is a transmitter for a communication system. The transmitter comprises a sidelobe suppression module configured to apply a suppression matrix to an input vector comprising symbols to be transmitted by the transmitter; a modulation module configured to modulate the precoded vector to a time-domain symbol using a plurality of subcarriers, each symbol in the precoded vector having a corresponding subcarrier; and a digital-to-analog conversion module configured to convert the time-domain symbol to an analog waveform for transmission. The suppression matrix is constructed such that emissions at one or more predetermined suppression distances lying outside a frequency band defined by the subcarriers are set to zero according to a predetermined emission model.
    Type: Grant
    Filed: January 27, 2011
    Date of Patent: August 5, 2014
    Assignee: Commonwealth Scientific and Industrial Research Organisation
    Inventors: Jian Zhang, Xiaojing Huang, Yingjie Jay Guo
  • Patent number: 8725092
    Abstract: In accordance with an example embodiment of the present invention, an apparatus comprises a first multiplier configured to convert a first frequency signal into a second frequency signal based at least in part on a first complex-valued local oscillator signal, a pair of low-pass filters configured to filter the second frequency signal, and a second multiplier configured to convert the filtered second frequency signal into a third frequency signal based at least in part on a second complex-valued local oscillator signal wherein the first frequency signal and the third frequency signal share the same frequency position and the pair of low-pass filters is configured based on an indication of allocated transmitted channels.
    Type: Grant
    Filed: November 11, 2009
    Date of Patent: May 13, 2014
    Assignee: Nokia Corporation
    Inventors: Markus Nentwig, Risto Ilari Wichman
  • 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
  • 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: 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
  • Patent number: 8503574
    Abstract: A transmitter includes an encoding module, an adaptive hierarchical signal mapping module and a transceiver module. The encoding module receives an input signal and encodes the input signal. The input signal includes data to be transmitted. The adaptive hierarchical signal mapping module modulates the encoded signal according to one or more hierarchical level distance ratios to obtain modulated symbols. The hierarchical level distance ratio defines distances between the modulated symbols. The transceiver module generates a radio frequency signal according to the modulated symbols and transmits the radio frequency signal to an air interface.
    Type: Grant
    Filed: May 24, 2010
    Date of Patent: August 6, 2013
    Assignee: National Taiwan University
    Inventors: Jing-Shown Wu, Hen-Wai Tsao, Yang-Han Lee, Yu-Lin Shiao
  • Patent number: 8489040
    Abstract: A clock generator circuit generates a wanted RF clock signal by using an up-converter, a spurious tone cancellation circuit, a controller, and at least two clock driver/dividers. The spurious tone cancellation circuit includes a tone detection circuit and a tone generation circuit. The up-converter mixes modulation signals with local quadrature RF clock signals to create an up-converted signal having a frequency tone equal to a desired frequency of the wanted RF clock signal. The first clock driver/divider amplifies and clips the up-converted signal into a first-clipped clock signal. The tone detection circuit detects the amplitude and phase of unwanted tones of the first-clipped clock signal in the baseband domain and provides information to the controller, which controls the tone generation circuit to cancel the unwanted tones and create a compensated version of first-clipped clock signal.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: July 16, 2013
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Fenghao Mu
  • Patent number: 8428206
    Abstract: A method and system of fine timing synchronization for an OFDM signal. The OFDM signal is coarse timing synchronized, generating a synchronization sequence and a CFR (Channel Frequency Response). The synchronization sequence is removed. A correlation coefficient of the correlation between the CFR applied to a number of carriers and the number of carriers with different window shifts is calculated. The largest window shift corresponding to a downsampling factor is indicated by the lowest correlation coefficient greater than a threshold. The CFR is downsampled by the downsampling factor, and an inverse FFT is performed on the downsampled CFR with a reduced number of calculations reduced by the downsampling factor, transforming the CFR into a CIR. A fine timing synchronization position is determined from the CIR and is utilized by an FFT unit within an OFDM receiver to accurately receive OFDM symbols of the OFDM signal.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: April 23, 2013
    Assignee: NXP B.V.
    Inventor: Yan Li
  • Patent number: 8369432
    Abstract: A mobile station (14) transmits a signal after connection is established, by using the same number of subcarriers as the number of subcarriers equal to or smaller than a predetermined number used for transmitting a connection request signal (TCCH). A base station (12) detects the number of subcarriers used for transmitting the connection request signal (TCCH) (S106), and controls in accordance with the detected number of subcarriers the passband width of a bandpass filter having a passband with a variable width accommodating the predetected number of subcarriers, for separating a signal of the mobile station (14) falling within the passband from a received signal (S108).
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: February 5, 2013
    Assignee: Kyocera Corporation
    Inventor: Nobuyuki Tanaka
  • Patent number: 8340219
    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: October 10, 2007
    Date of Patent: December 25, 2012
    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: 20120302185
    Abstract: In a transmission apparatus, a comparison unit provides threshold values associated with an amount of data indicating a signal frequency, and compares an input parameter obtained by cumulatively adding a correction amount to the parameter with the threshold values. When the input parameter is within a range defined by the threshold values, a correction unit outputs a value of the input parameter. When the input parameter is out of the defined range, the correction unit outputs an associated one of the threshold values so as to eliminate an amount exceeding or falling short of the defined range, to thereby correct the input parameter. An addition unit detects the correction amount which is an amount of the immediately preceding value of the input parameter exceeding or falling short of the defined range, and cumulatively adds the correction amount to the input parameter used for the comparison of this time.
    Type: Application
    Filed: March 30, 2012
    Publication date: November 29, 2012
    Applicant: FUJITSU LIMITED
    Inventors: Shingo HOTTA, Hiromichi MAKISHIMA, Hiroyuki HONMA, Ichirou YOKOKURA
  • 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: 8290452
    Abstract: A Radio Frequency (RF) transmitter and a signal amplification method therefor are provided, in which a signal source generates a signal of a predetermined Intermediate Frequency (IF) band, a local oscillator generates a signal of a predetermined high frequency band as a carrier signal, a power amplifier amplifies the signal received from the local oscillator to a predetermined transmission level, and a parametric mixer module receives the signals from the signal source and the power amplifier and outputs the received signals as a radio signal for transmission. The signal output from the parametric mixer module is transmitted as the radio signal without additional amplification.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: October 16, 2012
    Assignee: KMW Inc.
    Inventors: Duk-Yong Kim, Yeung Jun Kim, Ik Soo Chang, Myong-hun Yang, Hang Ho Shin, Jae Won Kim
  • Patent number: 8284875
    Abstract: Certain embodiments of the present disclosure provide a method for frequency-domain gain control in system utilizing orthogonal frequency division multiplexing (OFDM) multiple input multiple output (MIMO). The proposed method reduces the complexity of the system while maximizing the internal accuracy of the OFDM MIMO decoder and preserving the performance of the system.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: October 9, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Jong Hyeon Park, Michael L. McCloud, Brian C. Banister
  • Patent number: 8280314
    Abstract: A method for compensating a transceiver for impairments includes transmitting a plurality of partial bandwidth training signals using a transmitter. A plurality of response signals of a receiver having a bandwidth and exhibiting receiver impairments is captured. Each response signal is associated with one of the partial bandwidth training signals. Each of the partial bandwidth training signals is associated with a portion of the receiver bandwidth. A plurality of partial compensation filters is generated based on the plurality of response signals. Each partial compensation filter is associated with one of the response signals. The partial compensation filters are combined to configure a receiver compensation filter operable to compensate for the receiver impairments.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: October 2, 2012
    Assignee: Alcatel Lucent
    Inventors: Michael Steven Heutmaker, Walter Honcharenko
  • Patent number: 8279014
    Abstract: A frequency synthesizer of a transceiver for generating a crystal oscillation frequency and a carry frequency having been done a process of frequency offset cancellation with that of another transceiver. The frequency offset cancellation of the frequency synthesizer is done in accordance with a wireless signal which is transmitted from another transceiver received. The frequency synthesizer has a first sigma-delta modulator receiving a signal transmitted by a transceiver at far area responding thereafter a frequency divisor value in accordance with the channel information of the received signal and a frequency offset between two.
    Type: Grant
    Filed: January 7, 2011
    Date of Patent: October 2, 2012
    Assignee: Uniband Electronic Corp.
    Inventors: Chun-Chin Chen, Yun-Hsueh Chuang, Yi-Chun Lu
  • Patent number: 8270544
    Abstract: According to one aspect of the present invention, an apparatus is provided to enable weather band radio signals to be received and processed using a digital signal processor (DSP). The DSP can include functionality to implement both frequency modulation (FM) demodulation and weather band data demodulation, i.e., specific area encoding (SAME) demodulation. In one such embodiment, soft decision samples of a SAME message can be combined, and based on a combined result, a hard decision unit can generate a bit value of weather band data.
    Type: Grant
    Filed: January 3, 2012
    Date of Patent: September 18, 2012
    Assignee: Silicon Laboratories Inc.
    Inventor: Junsong Li
  • Patent number: 8260371
    Abstract: A battery pack is provided which includes an antenna coil for generating a magnetic field, a battery cell and a positive pole terminal and a negative pole terminal electrically connected with the battery cell, wherein a resultant of superimposing current from the battery cell or current to the battery cell and a signal from the antenna coil or a signal to the battery is sent from the positive pole terminal or the negative pole terminal, or received from the positive pole terminal or the negative pole terminal.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: September 4, 2012
    Assignee: Felica Networks, Inc.
    Inventors: Shogo Kawata, Shuichi Sekiya, Kiyotada Yokogi
  • Patent number: 8160195
    Abstract: Methods for processing a signal of interest in an electrical power system are provided, as well as systems and computer program products for carrying out the methods. The methods include obtaining a representative window of data points from the signal of interest; obtaining a window of interest containing data points from the signal of interest; and comparing a phase drift compensated window to the representative window, wherein the compensated window is calculated in accordance with the window of interest and a phase drift that is present in the window of interest relative to the representative window.
    Type: Grant
    Filed: November 2, 2007
    Date of Patent: April 17, 2012
    Assignee: The Texas A & M University System
    Inventors: Karthick Muthu-Manivannan, Carl L. Benner, Peng Xu, Billy Don Russell
  • Patent number: 8112044
    Abstract: A transceiver is provided for wireless communication. The transceiver can include a bias source, a transformer including a primary side and a secondary side, and a switching device. During a receive mode, the primary side of the transformer is configured to receive a first signal from a first port. During a transmission mode, the primary side is configured to transmit a second signal from a second port. The switching device is configured to couple the first port to the bias source during transmission of the second signal and to couple the second port to the bias source during receipt of the first signal. The bias source can be, for example, ground.
    Type: Grant
    Filed: January 4, 2011
    Date of Patent: February 7, 2012
    Assignee: Broadcom Corporation
    Inventors: Bojko F. Marholev, Jesus A. Castaneda
  • Patent number: 8055218
    Abstract: This invention provides a wireless transmitter circuit for mobile communication apparatus and this circuit can be configured with fewer components and is suitable for downsizing. A single PLL synthesizer serves as both RF frequency band PLL and IF frequency band PLL among three oscillators for TX, RX and IF frequency bands, which have been required in conventional mobile communication apparatus. The number of necessary oscillators occupying a large area within a chip is reduced and the number of components is decreased. Specifically, circuitry is arranged to generate local oscillation signals for RF and IF frequency bands by frequency dividing the output of a VCO of the RF frequency band PLL.
    Type: Grant
    Filed: June 22, 2005
    Date of Patent: November 8, 2011
    Assignee: Renesas Electronics Corporation
    Inventors: Satoshi Tanaka, Yukinori Akamine, Manabu Kawabe, Yasuyuki Kimura, Takao Okazaki
  • Patent number: 8032097
    Abstract: A power amplifier controller circuit controls a power amplifier based upon an amplitude correction signal indicating the amplitude difference between the amplitude of the input signal and an attenuated amplitude of the output signal. The power amplifier controller circuit comprises an amplitude control loop and a phase control loop. The amplitude control loop adjusts the supply voltage to the power amplifier based upon the amplitude correction signal. The RF power amplifier system may reduce the corrective action of the amplitude loop during periods of relatively rapid changes in amplitude, and thus distortion can be further reduced.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: October 4, 2011
    Assignee: Quantance, Inc.
    Inventors: Serge F. Drogi, Vikas Vinayak, Martin A. Tomasz
  • Patent number: 8023897
    Abstract: In a control method of a communication system, a Base Station (BS) receives noise and interference information from at least one neighboring BS in charge of a neighboring cell being adjacent to a serving cell of the BS, calculates a control value of Mobile Stations (MSs) located in the serving cell according to the received noise and interference information, and generates control information according to the calculated control value, and transmits the generated control information to the MSs.
    Type: Grant
    Filed: July 5, 2007
    Date of Patent: September 20, 2011
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Jae-Hee Cho, Jeong-Ho Park, Kwan-Hee Roh, Tae-Young Kim, Jin-Kyu Koo
  • Patent number: 8008979
    Abstract: A frequency synthesizer (100) can selectively set an output band of VCO, and consumes less power. The frequency synthesizer (100) has a frequency converting circuit (110) that has a mixer (111) and a frequency divider (112) connected with each other in parallel. The frequency synthesizer (100) uses the frequency divider (112) upon frequency band selection in VCO (101) and uses the mixer (111) upon transmission.
    Type: Grant
    Filed: September 24, 2009
    Date of Patent: August 30, 2011
    Assignee: Panasonic Corporation
    Inventor: Shunsuke Hirano
  • Patent number: 8010063
    Abstract: A communications transmitter having a main transmit chain for main signal features and one or more auxiliary transmit chains for auxiliary signal enhancements. In one embodiment, a communications signal is produced by digitally processing a representation of a desired signal so as to limit a trajectory of a signal represented by a resulting processed signal. A digital representation of a difference signal approximating a difference between the processed signal and the desired signal is produced. A first modulated, amplified signal is produced in dependence on the processed signal, and a second modulated, amplified signal is produced in response to the difference signal. The first modulated, amplified signal and the second modulated, amplified signal are combined to produce the desired signal. In this manner, a main transmit chain may be optimized with respect to other properties than signal quality (e.g.
    Type: Grant
    Filed: May 16, 2008
    Date of Patent: August 30, 2011
    Assignee: Panasonic Corporation
    Inventors: Matthew Mow, Richard W. D. Booth
  • Patent number: 7970370
    Abstract: A signal conversion apparatus includes a local oscillator for locally generating a signal having a frequency, a phase shifter for shifting the phase of the locally generated signal output from the local oscillator by an amount determined based on a relationship between the amount of phase shift and the amount of frequency pulling, and a converter for converting an input signal by using the phase-shifted locally generated signal output from the phase shifter. The phase shifter varies impedance between the local oscillator and the converter so that the oscillating frequency of the locally generated signal output from the local oscillator remains unchanged.
    Type: Grant
    Filed: July 11, 2006
    Date of Patent: June 28, 2011
    Assignee: Furuno Electric Company Limited
    Inventors: Takayoshi Hirose, Takuo Kashiwa
  • Patent number: 7953428
    Abstract: Excessive quality in the receiving apparatus is controlled to obtain the combined gain by distinctively controlling the re-transmission for the first transmission. A transmitting apparatus for transmitting the data to a receiving apparatus to execute regeneration of data using, for example, the received data and the re-transmitted data, comprises a control unit operable to receive an indication that an error has been detected in received data transmitted in a first transmission, to re-transmit the data in a second transmission, and to control resources for re-transmission of the data to use fewer resources for the second transmission than for the first transmission.
    Type: Grant
    Filed: February 28, 2005
    Date of Patent: May 31, 2011
    Assignee: Fujitsu Limited
    Inventors: Masahiko Shimizu, Akira Ito
  • Publication number: 20110111710
    Abstract: In accordance with an example embodiment of the present invention, an apparatus comprises a first multiplier configured to convert a first frequency signal into a second frequency signal based at least in part on a first complex-valued local oscillator signal, a pair of low-pass filters configured to filter the second frequency signal, and a second multiplier configured to convert the filtered second frequency signal into a third frequency signal based at least in part on a second complex-valued local oscillator signal wherein the first frequency signal and the third frequency signal share the same frequency position and the pair of low-pass filters is configured based on an indication of allocated transmitted channels.
    Type: Application
    Filed: November 11, 2009
    Publication date: May 12, 2011
    Applicant: NOKIA CORPORATION
    Inventors: Markus Nentwig, Risto Ilari Wichman
  • Patent number: 7881677
    Abstract: A chip comprises and operational section and an input/output section. The operational section includes a controller. The input/output (I/O) section is coupled to the operational section. The I/O section comprises a transformer and a switching device. The transformer includes a primary side connected to first and second I/O ports and a secondary side connected to the operational section. The switching device is coupled to the controller and between the first and second I/O ports and a bias port, such that, under control of the controller, the switching device connects one of the first and second I/O ports to the bias port.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: February 1, 2011
    Assignee: Broadcom Corporation
    Inventors: Bojko F. Marholev, Jesus A. Castaneda
  • Publication number: 20100233976
    Abstract: According to an aspect of the invention, an oscillating circuit includes: a first MOS transistor having a first drain terminal and a first source terminal; a load element connected to the first drain terminal; and an oscillator connected to the first source terminal and outputs a fundamental signal and a harmonic signal, wherein the harmonic signal is amplified so that the amplified harmonic signal is output from the first drain terminal.
    Type: Application
    Filed: September 14, 2009
    Publication date: September 16, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hiroaki Hoshino, Toshiya Mitomo
  • Patent number: 7773954
    Abstract: A device and method for synthesizing a transmission frequency (a Tx frequency) in a wireless terminal are provided, which are designed for stably operating a Phase Locked Loop (PLL) in order to synthesize a Tx frequency for a certain channel.
    Type: Grant
    Filed: August 9, 2007
    Date of Patent: August 10, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: In-Tae Jun
  • Publication number: 20100046669
    Abstract: A method processes defects in a radio frequency transmission subsystem due to elements therein. The defects may include mismatch between two channels in phase quadrature in the transmission subsystem and a transposition signal leaking from a first frequency transposition stage of the transmission subsystem. The method may include calibration processing including estimating compensation parameters representative of the defects. The estimating may include delivering, into the transmission subsystem upstream of the elements creating the defects, a reference signal having a reference frequency, obtaining, downstream of the first transposition stage, of a resultant reference signal, and obtaining, from the resultant reference signal, of an approximate value for each compensation parameter. The method also may include compensating for the defects by injecting the approximate values into the transmission subsystem.
    Type: Application
    Filed: July 20, 2009
    Publication date: February 25, 2010
    Applicants: STMicroelectronics N.V., STMicroelectronics (Grenoble) SAS
    Inventors: Antoine HUE, Gabriel Della-Monica
  • Patent number: 7649428
    Abstract: A method and system for generating noise in a frequency synthesizer are provided. The method includes generating a noise portion of an input signal within the frequency synthesizer and appending the noise portion to a control portion of the input signal.
    Type: Grant
    Filed: March 13, 2007
    Date of Patent: January 19, 2010
    Assignee: Pine Valley Investments, Inc.
    Inventor: Ajit Kumar Reddy
  • Patent number: 7646762
    Abstract: A communication system that includes a Multimedia Broadcast Multicast Service (MBMS) service provides re-broadcasts of an event to subscribers to the MBMS service. An infrastructure included in the communication system and comprising a server coupled to a RAN controller via a support node receives a first set of MBMS data from an MBMS content provider and conveys the first set of MBMS data along with an associated first Session Description to a subscribed mobile station. The infrastructure then receives a second set of MBMS data from the MBMS content provider, wherein the second set of MBMS data comprises a re-conveyance of the first set of MBMS data, and conveys an MBMS notification along with an associated second Session Description to the mobile station. The mobile station may then determine whether to receive the re-conveyance based on the first and second Session Descriptions.
    Type: Grant
    Filed: August 4, 2004
    Date of Patent: January 12, 2010
    Assignee: Motorola, Inc.
    Inventors: Zhijun Cai, Bonnie Chen
  • Patent number: 7555272
    Abstract: A transmission arrangement is provided for transmitting data continuously in the time domain. The arrangement includes at least one programmable amplifier in the baseband or in the radio frequency path in the signal processing chain for the signal which is to be transmitted. This programmable amplifier is distinguished in that the signal which actuates the programmable amplifier is a discrete-value signal. By dispensing with complex digital/analog converters, the principle described allows markedly reduced power consumption in transmitters which use code multiple access methods.
    Type: Grant
    Filed: June 21, 2004
    Date of Patent: June 30, 2009
    Assignee: Infineon Technologies AG
    Inventor: Zdravko Boos
  • Patent number: 7548762
    Abstract: A system and method is provided for tuning a Global Positioning System (GPS) antenna matching circuit in a portable wireless communications device. The method includes accepting a first matching circuit tuning value, measuring satellite vehicle (SV) carrier-to-noise ratio (C/N) associated with the first tuning value and a first search time interval, measuring the SV C/N associated with a next tuning value, and selecting the tuning value associated with the highest SV C/N to tune the matching circuit. In one aspect, the method further includes comparing the SV C/N to a first minimum threshold. If the first tuning value SV C/N exceeds the first minimum threshold, then the method measures the SV C/N associated with the next tuning value. Otherwise, a default tuning value can be selected to tune the matching circuit.
    Type: Grant
    Filed: November 30, 2005
    Date of Patent: June 16, 2009
    Assignee: Kyocera Corporation
    Inventors: Jorge Fabrega-Sanchez, Henry Chang, Srivatsan Veeraraghavan, Ammar Kitabi
  • Patent number: 7499507
    Abstract: A method for synchronizing receivers that receive turbo encoded signals to a received signal. Turbo encoding may enable signals to be decoded at a much lower signal to noise ratio than previously practical. A traditional method of synchronizing a receiver to an incoming signal is to use a slicer to determine a received symbol and then to compare the determined symbol to the incoming waveform, in order to adjust the phase of the slicer with respect to the incoming signal. At signal low levels, at which turbo encoded signals may be decoded, this slicing method may be prone to errors that may disrupt the synchronization of the receiver to the incoming signal. By replacing the slicer by a Viterbi decoder with zero traceback (i.e. one which does not consider future values of the signal only past values) a prediction as to what the incoming signal is can be made.
    Type: Grant
    Filed: December 4, 2000
    Date of Patent: March 3, 2009
    Assignee: Broadcom Corporation
    Inventors: Steven T. Jaffe, Kelly B. Cameron, Christopher R. Jones
  • Publication number: 20090004978
    Abstract: A method is provided for operating a transmitter integrated in a microelectronic element. In a calibration phase, a plurality of operational parameters are stored for controlling a frequency response of the transmitter under each of a plurality of corresponding operating conditions. Upon detecting an operating condition such as a temperature or power supply voltage level, the corresponding stored operational parameter is applied to the transmitter to control the frequency response.
    Type: Application
    Filed: June 27, 2007
    Publication date: January 1, 2009
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Louis L. Hsu, Hayden C. Cranford, Jr., Joseph Natonio, James D. Rockrohr, Huihao Xu, Steven J. Zier