With Particular Discriminator Or Detector Patents (Class 455/214)
  • Patent number: 10270545
    Abstract: A device for detecting an interference signal includes an estimator configured to estimate a mean value of received signals output from an analog-digital converter (ADC), a filter configured to filter a low frequency band of the received signals using the estimated mean value to produce filtered received signals, a detector configured to detect, from the filtered received signals, interference signals using a coherent modulation scheme and a non-coherent modulation scheme, and a combiner configured to determine whether interference exists in a frequency channel in response to a result of the interference signal detecting using the coherent modulation scheme and the non-coherent modulation scheme, based on a preset condition.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: April 23, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chang Soon Park, Hyo Sun Hwang, Joon Seong Kang, Young Jun Hong
  • Patent number: 10222468
    Abstract: A radar system may comprise a trigger, driver, switching circuit, and antenna for generating an ultra-short impulse without utilizing an oscillator. A radar imaging system for imaging a formation or a cross section of a pipeline may include at least one radar sensor. The system may transmit a high-frequency, short impulse signal to a formation or pipeline and measure a reflected signal. A high speed impulse generator may allow the short impulse signals to be generated. This impulse generator may utilize a switching circuit and digital driver to provide the short impulse signals. The images provide useful information about complex permittivity of the formation, the geometry of the pipeline, deposition thickness of asphaltenes and wax, velocity of the fluid, as well as size, type, concentration of gas bubbles, water, or solid particles in the flow, or combinations thereof.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: March 5, 2019
    Assignee: William Marsh Rice University
    Inventors: M. Mahdi Assefzadeh, Aydin Babakhani
  • Patent number: 10211935
    Abstract: Methods, apparatus, systems and articles of manufacture to verify radio station watermarking with software defined radios are disclosed. Example apparatus disclosed herein include a notch filter having a bandwidth and a center frequency corresponding to a first radio station broadcast signal, and a software defined radio front-end to downconvert a radio frequency band to a baseband signal, the radio frequency band including a second radio station broadcast signal different from the first radio station broadcast signal. Disclosed example apparatus also include a software defined radio application to tune to a portion of the baseband signal corresponding to the second radio station broadcast signal and to demodulate the portion of the baseband signal to generate audio data corresponding to the second radio station broadcast signal. Disclosed example apparatus further include a watermark decoder to detect a watermark in the audio data corresponding to the second radio station broadcast signal.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: February 19, 2019
    Assignee: The Nielsen Company (US), LLC
    Inventor: Raghuram Ranganathan
  • Patent number: 10135449
    Abstract: The invention relates to a phase detection method. A plurality of consecutive values of a receiving signal with a known sampling frequency fs are received as a reaction to a transmitting signal having a known transmitting frequency fw. Two differential values are determined, each coming from two consecutive values out of three consecutive values of the receiving signal. A phase real part and a phase imaginary part of the receiving signal are determined based on a linear relation between the phase real part, the phase imaginary part and the two differential values.
    Type: Grant
    Filed: October 14, 2015
    Date of Patent: November 20, 2018
    Assignee: SONOVUM AG
    Inventors: Miroslaw Wrobel, Adam Kolany
  • Patent number: 10027368
    Abstract: The present disclosure describes systems and methods for determining intermodulation distortion in a system such as, but not limited to, a communication system. In an embodiment, intermodulation distortion is determined by injecting a signal into a frequency band which interacts with a second signal, searching a second frequency band for a product signal formed from the first and second signals, applying a cyclostationarity detection technique to the product signal and identifying the product signal as an intermodulation distortion signal.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: July 17, 2018
    Assignee: CommScope Technologies LLC
    Inventors: Thomas B. Gravely, Martin C. Alles, Andrew E. Beck, Navin Srinivasan
  • Patent number: 9124480
    Abstract: In accordance with an example embodiment of the present invention the application discloses a method and an apparatus to receive a signal (501) in a radio device on a radio channel; calculate a plurality of cyclic autocorrelations (504?, 505) for the received signal (501), wherein calculating the plurality of cyclic autocorrelations comprises selecting a cyclic frequency (503) and at least two delay values (502, 512) corresponding to the plurality of cyclic autocorrelations (504?, 505); to compensate a phase offset of at least one of the plurality of cyclic autocorrelations (504?) by at least one compensation term (506) to obtain a plurality of phase compensated autocorrelations (504), wherein the compensation term (506) is dependent on the cyclic frequency (503) and a corresponding delay value of the at least two delay values; and to combine the plurality of phase compensated autocorrelations.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: September 1, 2015
    Assignee: Nokia Technologies Oy
    Inventor: Vesa Turunen
  • Publication number: 20150072633
    Abstract: A frequency discriminator comprising a power splitter for splitting a signal into first and second paths, wherein the first path is configured to provide a first, straight-through signal and the second path includes a frequency-dependent element, such as low-pass filter, so as to provide a second signal. The frequency discriminator further comprises a circuit configured to compare the first and second signals and generate an instantaneous frequency signal in dependence thereon.
    Type: Application
    Filed: January 28, 2014
    Publication date: March 12, 2015
    Applicant: CRFS LIMITED
    Inventors: Alistair Massarella, Daniel Timson, Keith Alexander
  • Patent number: 8929486
    Abstract: Compressing a variable phase component of a received modulated signal with a second harmonic injection locking oscillator, and generating a delayed phase-compressed signal with a fundamental injection locking oscillator, and combining the phase-compressed signal and the delayed phase-compressed signal to obtain an estimated derivative of the variable phase component, and further processing the estimated derivative to recover data contained within the received modulated signal.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: January 6, 2015
    Assignee: Innophase Inc.
    Inventors: Yang Xu, Sara Munoz Hermoso
  • Publication number: 20140335809
    Abstract: A wireless receiver (10) includes a down converter module (210) operable to deliver a signal having a signal bandwidth that changes over time, a dynamically controllable filter module (200) having a filter bandwidth and fed by said down converter module (210), and a measurement module (295) operable to at least approximately measure the signal bandwidth, said dynamically controllable filter module (200) responsive to said measurement module (295) to dynamically adjust the filter bandwidth to more nearly match the signal bandwidth as it changes over time, whereby output from said filter module (200) is noise-reduced. Other wireless receivers, electronic circuits, and processes for their operation are disclosed.
    Type: Application
    Filed: July 3, 2014
    Publication date: November 13, 2014
    Inventor: Jaiganesh Balakrishnan
  • Patent number: 8848847
    Abstract: One embodiment of the present invention relates to a combined mixer filter circuit. The circuit includes a sampler, a plurality of filter branches, and a coefficient generator. The sampler is configured to provide a sampled signal by sampling a received signal at a specified rate. The plurality of filter branches has selectable filter coefficients. The plurality of filter branches are configured to receive the sampled signal and generate a mixed and filtered output signal without a separate mixer component. The coefficient generator is coupled to the plurality of filter branches. The coefficient generator is configured to assign filter coefficient values to the selectable filter coefficients to yield a selected mixing function for the mixed filtered output signal.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: September 30, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Christoph Schultz, Markus Hammes, Rainer Kreienkamp
  • Publication number: 20140287705
    Abstract: A method and corresponding device for processing a frequency-modulated analog signal are disclosed. The signal includes a number of symbols belonging to a set of M symbols respectively associated with at least one frequency of a set of M frequencies. The method includes a phase of reading each symbol of the signal that includes a sampling of a signal portion corresponding to the duration of a symbol and delivering N samples (M being less than N). M individual discrete Fourier transform processing operations are performed on the N samples. Each individual processing operation is associated with each of the frequencies. The M individual processing operations deliver M processing results. The value of the symbol can be determined from the M processing results.
    Type: Application
    Filed: March 19, 2014
    Publication date: September 25, 2014
    Applicants: STMICROELECTRONICS (GRENOBLE 2) SAS, STMICROELECTRONICS SA
    Inventors: Vincent Heinrich, Bruno Paille
  • Patent number: 8824990
    Abstract: There is provided a method for use in a wireless communication to avoid detection of a false modulated signal in a paged device. In one embodiment, a modulated signal is received by the paged device. Then, the modulated signal is identified by the paged device as a preliminary false modulated signal. Thereafter, the gain of at least one paged device amplifier and/or a matching threshold of the paged device is reduced by the paged device to decrease a sensitivity of the paged device to avoid detection of a future false modulated signal. In one embodiment, the wireless communication is a Bluetooth wireless communication and the paged device is a Bluetooth enabled device. An exemplary system for implementing one embodiment of the disclosed method is described.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: September 2, 2014
    Assignee: Broadcom Corporation
    Inventors: Steven D. Hall, Brima Ibrahim, Langford Wasada
  • Patent number: 8804875
    Abstract: Compressing a variable phase component of a received modulated signal with a second harmonic injection locking oscillator, and generating a delayed phase-compressed signal with a fundamental injection locking oscillator, and combining the phase-compressed signal and the delayed phase-compressed signal to obtain an estimated derivative of the variable phase component, and further processing the estimated derivative to recover data contained within the received modulated signal.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: August 12, 2014
    Assignee: Innophase Inc.
    Inventors: Yang Xu, Sara Munoz Hermoso
  • Patent number: 8799417
    Abstract: The illustrative embodiments described herein provide a method, apparatus, and computer program product for customizing settings in a communication device for a user. In one illustrative embodiment, the process identifies a user profile to which a user belongs. The process identifies a set of custom communication device settings associated with the user profile. The process also sets a current set of communication device settings for a set of functions in a communication device to the set of custom communication device settings. In one embodiment, identifying the user profile to which the user belongs includes identifying the user profile to which the user belongs based on one or more characteristics of the user.
    Type: Grant
    Filed: April 24, 2008
    Date of Patent: August 5, 2014
    Assignee: CenturyLink Intellectual Property LLC
    Inventor: Catherine M. Pearce
  • Patent number: 8774321
    Abstract: A clock data recovery circuit includes: a demodulation filter that receives a transmission signal transmitted by two orthogonal carrier waves having I and Q phases and executes demodulation to obtain a demodulated wave having an phase and a demodulated wave having a Q phase from the transmission signal; a first determination circuit that determines whether an absolute value of one of the two demodulated waves is greater than an eye opening maximum value at an ideal clock phase of the transmission signal; a second determination circuit that determines whether the one demodulated wave is greater than zero; a third determination circuit that determines whether the other one of the two demodulated waves is greater than zero; and a phase comparison unit that detects whether a phase of a clock signal included in the transmission signal is leading a phase of a data signal included in the transmission signal, based on determination results obtained by the first to third determination circuits.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: July 8, 2014
    Assignee: NEC Corporation
    Inventors: Kazuhisa Sunaga, Kouichi Yamaguchi
  • Patent number: 8774746
    Abstract: There is provided a method for use in a wireless communication to avoid detection of a false modulated signal in a paged device. In one embodiment, a modulated signal is received by the paged device. Then, the modulated signal is identified by the paged device as a preliminary false modulated signal. Thereafter, the gain of at least one paged device amplifier and/or a matching threshold of the paged device is reduced by the paged device to decrease a sensitivity of the paged device to avoid detection of a future false modulated signal. In one embodiment, the wireless communication is a Bluetooth wireless communication and the paged device is a Bluetooth enabled device. An exemplary system for implementing one embodiment of the disclosed method is described.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: July 8, 2014
    Assignee: Broadcom Corporation
    Inventors: Steven D. Hall, Brima Ibrahim, Langford Wasada
  • Patent number: 8755461
    Abstract: A local wireless signal receiving apparatus using digital RF processing technology including: a receiving digital RF processor receiving an RF signal and detecting an IF signal from the received RF signal; a zero-crossing signal detector detecting a zero-crossing signal from the detected IF signal, and converting the detected zero-crossing signal into a digital signal; and a receiving signal processor converting the digital signal into a local wireless signal.
    Type: Grant
    Filed: May 19, 2009
    Date of Patent: June 17, 2014
    Assignee: SK Telecom Co., Ltd.
    Inventors: Woo Jin Shim, Young Woo Kim, Jae Hwang Yu, Sung Cheol Hong, Se Hyun Oh
  • Publication number: 20140080434
    Abstract: An apparatus for detecting microwave signals is suggested. The apparatus comprises an antenna for sending and receiving electromagnetic waves a circuit for detecting microwave signals and the signalization stage for generating an indication signal. In addition to that a method for detecting the presence of microwave signals is proposed. The method comprises the following steps receiving and detecting the microwave signal; correlating the received microwave signal with the previously stored microwave signal; generating an indication signal if the correlation between the received and the stored microwave signals exceeds a predetermined threshold value.
    Type: Application
    Filed: September 17, 2013
    Publication date: March 20, 2014
    Applicant: THOMSON LICENSING
    Inventors: Ali LOUZIR, Jean-Yves LE NAOUR, Jean-Luc ROBERT
  • Publication number: 20140057582
    Abstract: An FM receiver is unaware of the modulation level (frequency deviation) of the signal and has to make an estimate of it, or some reasonable time-average of it, and accordingly set the input filter's bandwidth. We calculate modulation by measuring the autocorrelation of the recovered audio signal instead of its peaks, and then applying a peakhold detector. Since FM noise can be modeled to be somewhat uncorrelated, we can expect to get an accurate estimate of signal power while rejecting noise power substantially if we measure a one-sample delayed autocorrelation estimate. Since the above measurement is alike a power measurement, we compute its square root, gain adjust it to obtain a cleaner peak measurement, and then track these clean peaks using a leaky integrator. This gives an estimate of modulation that subdues the effect of the noise.
    Type: Application
    Filed: August 24, 2012
    Publication date: February 27, 2014
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Sira Parasurama Rao, John Elliott Whitecar
  • Patent number: 8611839
    Abstract: A method (200) for detecting a periodic signal (141) in a noisy signal (101) is provided. The method can include applying (210) correntropy to the noisy signal to generate a non-linear mapping, and applying (220) a sub-space projection to the non-linear mapping to produce principal components. A correntropy kernel can be applied to the noisy signal to generate a Gram matrix that is used in a Temporal Principal Component Analysis (TPCA). The correntropy kernel projects nonlinearly the input data to a reproducing kernel Hilbert Space (RKHS) preserving the input time structure and attenuating impulsive noise. The correntropy kernel is data dependent, and the RKHS correlation matrix has the same dimension as the input data correlation matrix. A principal component having a majority of signal energy can be chosen (230) to detect the periodic signal.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: December 17, 2013
    Assignee: University of Florida Research Foundation, Inc.
    Inventors: Jose C. Principe, Weifeng Liu
  • Patent number: 8600312
    Abstract: An apparatus for wireless communication includes a processing system. The processing system is configured to estimate a power spectral density of a first signal. In addition, the processing system is configured to determine a normalized correlation detector between the estimated power spectral density and a known power spectral density of a second signal. Furthermore, the processing system is configured to determine whether the first signal contains the second signal based on the normalized correlation detector.
    Type: Grant
    Filed: January 25, 2010
    Date of Patent: December 3, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Zhi Quan, Stephen J. Shellhammer, Wenyi Zhang
  • Patent number: 8594574
    Abstract: Methods and apparatus are provided for receiving a first signal and generating an output signal indicative of radio data system (“RDS”) information. A receiver circuit of the invention can include mixer circuitry, lowpass filter circuitry, downsampler circuitry, and decoder circuitry. Advantageously, the receiver circuit can operate entirely within the digital domain, promoting interoperability with digital frequency modulation (“FM”) demodulator circuitry.
    Type: Grant
    Filed: November 19, 2012
    Date of Patent: November 26, 2013
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Dimitrios-Alexandros Toumpakaris, Hui-Ling Lou, Chris Cheng-Chieh Lee
  • Patent number: 8565676
    Abstract: A user can initiate the transmission of data on a mobile device by making physical contact with another device. The physical contact can be any type of physical touch that is referred to as a ‘tap’ or ‘tapping.’ When a tap is detected by a device, the device may initiate near field communication (NFC) with the other tapping device. NFC may be used to communicate data between the two devices, or NFC may be used to exchange sufficient information to allow the devices to establish a communication channel via another communication link. In some embodiments, an NFC-enabled mobile device can be used to gather group data relating to users having mobile devices that are within NFC range of one another and which initiate the aggregation of group data by the tapping of three or more devices.
    Type: Grant
    Filed: June 24, 2011
    Date of Patent: October 22, 2013
    Assignee: T-Mobile USA, Inc.
    Inventors: Georgiana Gormley, Winston Wang, Robert Buck, Valerie Goulart, Jeff Gough, Barb Brindle, Patrick Carney, Paulo S. T. Chow
  • Patent number: 8559564
    Abstract: A receiving system and a method of processing broadcast signals in the receiving system are disclosed. The receiving system includes a tuner, a known sequence detector, a carrier recovery unit, a baseband processor, and a channel equalizer. The tuner receives a broadcast signal of a passband including a data group. Herein, the data group comprises mobile service data, a plurality of known data sequences, and signaling data. The known sequence detector estimates an initial frequency offset and detects a position of each known data sequence based on the known data sequence having the first data pattern. The carrier recovery unit acquires an initial frequency synchronization using the initial frequency offset estimated by the known sequence detector and estimates a residual frequency offset based upon the known data sequences having the second data pattern so as to perform carrier recovery.
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: October 15, 2013
    Assignee: LG Electronics Inc.
    Inventors: Jin Woo Kim, Byoung Gill Kim, Won Gyu Song, Hyoung Gon Lee, In Hwan Choi
  • Patent number: 8543079
    Abstract: Provision of gigabit-rate data transmission over wireless radio links, using carrier frequencies in the millimeter-wave range (>30 GHz). More specifically, a circuit for detection of amplitude-shift keyed (ASK) or other amplitude modulations (AM) which can be easily incorporated into an integrated circuit receiver system is described, making the receiver capable of supporting both complex IQ modulation schemes and simpler, non-coherent on-off or multiple-level keying signals. Several novel radio architectures are also described which, with the addition of a frequency discriminator network, have the capability of handling frequency shift keyed (FSK) or other frequency modulations (FM), as well as AM and complex IQ modulation schemes. These radio architectures support this wide variety of modulations by efficiently sharing detector hardware components.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: September 24, 2013
    Assignee: International Business Machines Corporation
    Inventors: Troy J. Beukema, Scott K. Reynolds
  • Patent number: 8526898
    Abstract: A wideband receiver system is provided to concurrently receive multiple RF channels including a number of desired channels that are located in non-contiguous portions of a radio frequency spectrum and to group the number of desired channels into a contiguous frequency band. The system includes a wideband receiver having a complex mixer for down-shifting the multiple RF channels and transforming them to an in-phase signal and a quadrature signal in the baseband. The system further includes a wideband analog-to-digital converter module that digitizes the in-phase and quadrature signals and a digital frontend module that transforms the digital in-phase and quadrature signals to baseband signals that contains only the number of desired RF channels. that are now located in a contiguous frequency band. An up-converter module up-shifts the baseband signals to a contiguous band in an IF spectrum so that the system can directly interface with commercially available demodulators.
    Type: Grant
    Filed: April 19, 2010
    Date of Patent: September 3, 2013
    Assignee: Maxlinear, Inc.
    Inventors: Madhukar Reddy, Curtis Ling, Tim Gallagher
  • Patent number: 8521198
    Abstract: Techniques for operating a receiver to linearity performance and higher receive signal to noise ratio are described. The receiver includes one or more circuit blocks, e.g., a low noise amplifier (LNA), having discrete gain states. The gain states are selected based on switch points, with each switch point indicating a specific received signal level at which to switch from one gain state to another gain state. The switch points may be dynamically selected based on channel conditions, which may be characterized by the presence or absence or strength or frequency of jammers. A first set of switch points may be selected when jammers are detected, and a second set of switch points may be selected when jammers are not detected. The gain states are selected in accordance with the set of switch points selected for use.
    Type: Grant
    Filed: November 16, 2006
    Date of Patent: August 27, 2013
    Assignee: QUALCOMM, Incorporated
    Inventors: Steven C. Ciccarelli, Brian George, Soon-Seng Lau
  • Patent number: 8498601
    Abstract: A polar receiver using injection-locking technique includes an antenna, a first filter, a first voltage-controlled oscillator, a first mixer, a frequency discriminator, a second filter, a third filter, a first analog-digital converter, a second analog-digital converter and a digital signal processing unit. Mentioned polar receiver enables to separate an envelope signal and a frequency-modulated signal from a radio frequency signal received from the antenna via the injection locking technique of the first voltage-controlled oscillator and the frequency discriminator. The envelope component and the frequency-modulated component can be digitally processed by the digital signal processing unit to accomplish polar demodulation.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: July 30, 2013
    Assignee: National Sun Yat-Sen University
    Inventors: Tzyy-Sheng Horng, Chi-Tsan Chen, Chieh-Hsun Hsiao, Kang-Chun Peng
  • Patent number: 8406717
    Abstract: Systems and techniques for digital processing of FM stereo signals are described. In some implementations, a receiver system is provided. The receiver system can include a received signal input configured to receive a digital signal based on a received mono signal or a received stereo signal. The receiver system can also include a stereo detector coupled with the received signal input, the stereo detector configured to produce a stereo detection signal indicating either a received stereo signal or a received mono signal. The receiver system can further include a digital signal processor coupled with the stereo detector, the digital signal processor configured to process the digital signal based on stereo transmission when the stereo detection signal indicates a received stereo signal and process the digital signal based on mono transmission when the stereo detection signal indicates a received mono signal.
    Type: Grant
    Filed: July 9, 2008
    Date of Patent: March 26, 2013
    Assignee: Marvell International Ltd.
    Inventor: Hui-Ling Lou
  • Patent number: 8396437
    Abstract: There is provided a method for use in a wireless communication to avoid detection of a false modulated signal in a paged device. In one embodiment, a modulated signal is received by the paged device. Then, the modulated signal is identified by the paged device as a preliminary false modulated signal. Thereafter, the gain of at least one paged device amplifier and/or a matching threshold of the paged device is reduced by the paged device to decrease a sensitivity of the paged device to avoid detection of a future false modulated signal. In one embodiment, the wireless communication is a Bluetooth wireless communication and the paged device is a Bluetooth enabled device. An exemplary system for implementing one embodiment of the disclosed method is described.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: March 12, 2013
    Assignee: Broadcom Corporation
    Inventors: Steven D. Hall, Brima Ibrahim, Langford Wasada
  • Publication number: 20130045702
    Abstract: Provision of gigabit-rate data transmission over wireless radio links, using carrier frequencies in the millimeter-wave range (>30 GHz). More specifically, a circuit for detection of amplitude-shift keyed (ASK) or other amplitude modulations (AM) which can be easily incorporated into an integrated circuit receiver system is described, making the receiver capable of supporting both complex IQ modulation schemes and simpler, non-coherent on-off or multiple-level keying signals. Several novel radio architectures are also described which, with the addition of a frequency discriminator network, have the capability of handling frequency shift keyed (FSK) or other frequency modulations (FM), as well as AM and complex IQ modulation schemes. These radio architectures support this wide variety of modulations by efficiently sharing detector hardware components.
    Type: Application
    Filed: August 20, 2012
    Publication date: February 21, 2013
    Applicant: International Business Machines Corporation
    Inventors: Troy J. Beukema, Scott K. Reynolds
  • Patent number: 8346290
    Abstract: Techniques are described that can be used to determine a transmitter power level of a mobile station at cell edge. To determine transmitter power level, the technique considers at least a balance of power transmitted by mobile stations near cell edge and power transmitted by mobile stations closer to cell center, target mean received power by the base station from mobile stations near center cell, target mean power transmitted from cell edge mobile stations, signal-to-interference-power ratio between signals transmitted from base stations of different cells to the mobile station at cell edge, and channel gain.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: January 1, 2013
    Assignee: Intel Corporation
    Inventors: Ali Taha Koc, Shilpa Talwar, Changho Suh
  • Publication number: 20120329414
    Abstract: A level detection part 221 detects the field intensity of airwaves broadcast by a desired station, and an AM component extraction part 222 and a level detection part 223 cooperate with one another in detecting the multipath noise level. When the field intensity of the airwaves broadcast by the desired station is high and also the multipath noise level is comparatively low, a filter setting part 229 determines filtering processing to be performed by an adaptive filter part 133 as being FIR type filtering processing. And the filter setting part 229 performs settings for FIR type filtering processing on the adaptive filter part 133. As a result, it is possible to enhance the reproduction quality of the broadcast content sent by the desired station that has been tuned.
    Type: Application
    Filed: March 5, 2010
    Publication date: December 27, 2012
    Applicant: PIONEER CORPORATION
    Inventor: Hideyuki Kanno
  • Patent number: 8315568
    Abstract: Methods and apparatus are provided for receiving a first signal and generating an output signal indicative of radio data system (“RDS”) information. A receiver circuit of the invention can include mixer circuitry, lowpass filter circuitry, downsampler circuitry, and decoder circuitry. Advantageously, the receiver circuit can operate entirely within the digital domain, promoting interoperability with digital frequency modulation (“FM”) demodulator circuitry.
    Type: Grant
    Filed: January 6, 2012
    Date of Patent: November 20, 2012
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Dimitrios-Alexandros Toumpakaris, Hui-Ling Lou, Chris Cheng-Chieh Lee
  • Patent number: 8306493
    Abstract: Performing a decoding mode of a frequency modulation (FM) signal for an adaptive FM radio receiver includes passing the FM signal through a FM demodulator to obtain a composite signal that includes a pilot signal and noise around the pilot signal, passing the composite signal through a band bass filter, filtering the pilot signal from the noise using a pilot and noise separator that includes a notch filter that filters the pilot signal from the noise, obtaining average amplitudes of the pilot signal and the noise, comparing a ratio between the average amplitudes of the pilot signal and the noise with a programmable threshold, and selecting a decoding mode and an audio low pass filter. The decoding mode is selected based on a quality of the pilot signal being decoded and the audio LPF is selected based on the comparison ratio.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: November 6, 2012
    Assignee: Newport Media, Inc.
    Inventor: Yongru Gu
  • Patent number: 8260233
    Abstract: The IFBPF (80) can variably set a passband width (WF) and an attenuation slope (KF). The bandwidth control circuit (102), which is constituted in hardware, controls the WF in accordance with the receiving state, which is composed of a combination of the receiving electric field intensity, the modulation degree, and the intensity of the adjacent-channel interference. A microcomputer (54) controls the KF on the basis of a program stored in a nonvolatile memory (60) and finely adjusts the effective passband width. Control of the WF contradictory for prevention of audio distortion and control of adjacent-channel interference is required when high modulation and adjacent-channel interference exist in a weak electric field state, and the setting becomes difficult. In this particular case, a configuration in which the KF can be modified by a program allows an advantageous receiving state to be readily obtained.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: September 4, 2012
    Assignees: Sanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.
    Inventor: Keiji Kobayashi
  • Patent number: 8249542
    Abstract: This disclosure addresses providing gigabit-rate data transmission over wireless radio links, using carrier frequencies in the millimeter-wave range (>30 GHz). More specifically, a circuit for detection of amplitude-shift keyed (ASK) or other amplitude modulations (AM) which can be easily incorporated into an integrated circuit receiver system is described, making the receiver capable of supporting both complex IQ modulation schemes and simpler, non-coherent on-off or multiple-level keying signals. Several novel radio architectures are also described which, with the addition of a frequency discriminator network, have the capability of handling frequency shift keyed (FSK) or other frequency modulations (FM), as well as AM and complex IQ modulation schemes. These radio architectures support this wide variety of modulations by efficiently sharing detector hardware components.
    Type: Grant
    Filed: July 22, 2008
    Date of Patent: August 21, 2012
    Assignee: International Business Machines Corporation
    Inventors: Troy J. Beukema, Scott K. Reynolds
  • Patent number: 8224269
    Abstract: A vector modulator calibration system (“VMCS”) for obtaining a calibrated modulated output signal while minimizing spurious output signals from a vector modulator is shown. The VMCS may include a power sensor in signal communication with the vector modulator and a digitizer in signal communication with the power sensor.
    Type: Grant
    Filed: October 16, 2006
    Date of Patent: July 17, 2012
    Assignee: Agilent Technologies, Inc.
    Inventors: Roger L. Jungerman, Geoffrey Hopcraft, Zoltan Azary
  • Patent number: 8217683
    Abstract: A basic symmetric ?/2 phase-detector receives four control signals that control a differential current at the detector's output. Each respective control signal is a linear combination of a respective pair of signals chosen from a first input signal, its logic complement, a second input signal and the logic complement of the latter. Operation is based on time-averaging the differential current, the result being zero at a phase difference of ?/2. By means of adding one or more additional current sources to the output, controlled by one or more of the control signals, the basic operation is skewed. The time-averaged output current is now made zero only at a value of the phase difference different from ?/2. In an embodiment with uniform current sources and resistors, the modified detector is configured for a phase difference of ?/2N .
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: July 10, 2012
    Assignee: NXP B.V.
    Inventor: Yann Le Guillou
  • Patent number: 8170151
    Abstract: A receiver includes a band-pass filter that limits a passband of an IF (Intermediate Frequency) signal, an FSK detector that detects the IF signal passing through the band-pass filter to generate a detection signal, and a control block that controls a modulation sensitivity of the FSK detector and a pass bandwidth of the band-pass filter, in which the control block controls the modulation sensitivity of the FSK detector according to the pass bandwidth of the band-pass filter.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: May 1, 2012
    Assignee: Renesas Electronics Corporation
    Inventor: Shigeya Suzuki
  • Patent number: 8116799
    Abstract: A method for controlling power in a communication system is disclosed. The power control method includes the steps of calculating a first offset according to traffic information of a mobile station and data transmission channel quality information of the mobile station, determining a second offset according to received channel quality information of the mobile station, received from the mobile station, determining a third offset according to interference information received from other base stations neighboring the base station, and transmitting, to the mobile station, power control information determined based on the first offset, the second offset and the third offset.
    Type: Grant
    Filed: June 1, 2007
    Date of Patent: February 14, 2012
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Jae-Hee Cho, Kwan-Hee Roh, Soon-Young Yoon, Kyung-Joo Suh, In-Seok Hwang
  • Publication number: 20120034891
    Abstract: A communications apparatus is provided. A signal processing device receives an RF signal comprising a wanted signal complying with a first wireless communications protocol from an air interface and processes the RF signal according to one or more signal processing parameter(s) to obtain the wanted signal. An interference detector analyzes one or more characteristic(s) of an interference signal of the wanted signal. The interference signal complies with a second wireless communications protocol different from the first wireless communication protocol. A coexistence optimization controller is coupled to the signal processing device and the interference detector, obtains information regarding the characteristic(s) of the interference signal from the interference detector and dynamically adjusts the signal processing parameter(s) according to the characteristic(s) of the interference signal.
    Type: Application
    Filed: August 4, 2011
    Publication date: February 9, 2012
    Applicant: MediaTek Inc.
    Inventors: Yuan Chen, Ting-Che Tseng, Zih-Yin Ding
  • Patent number: 8112051
    Abstract: Method and system for false lock free autonomous scan in a receiver is disclosed. The method includes identifying a presence of a desired signal to avoid false frequency lock in a Frequency Modulation receiver. The method includes receiving a signal. The method further includes identifying the desired signal, if a first energy is above a first threshold. The method also includes identifying the desired signal, if an Intermediate Frequency count is below a second threshold. The method includes identifying the desired signal, if a second energy of the signal is above a third threshold. The method includes identifying the desired signal, if an absolute difference between a first Received Signal Strength Indication (RSSI) value and a second RSSI value of the signal is below a fourth threshold. The method includes determining a third energy. The method includes identifying the desired signal, if the third energy is below a fifth threshold.
    Type: Grant
    Filed: November 11, 2009
    Date of Patent: February 7, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Jaiganesh Balakrishnan, Aravind Ganesan, Sriram Murali, Bijoy Bhukania
  • Patent number: 8099050
    Abstract: Methods and apparatus are provided for receiving a first signal and generating an output signal indicative of radio data system (“RDS”) information. A receiver circuit of the invention can include mixer circuitry, lowpass filter circuitry, downsampler circuitry, and decoder circuitry. Advantageously, the receiver circuit can operate entirely within the digital domain, promoting interoperability with digital frequency modulation (“FM”) demodulator circuitry.
    Type: Grant
    Filed: August 20, 2009
    Date of Patent: January 17, 2012
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Dimitrios-Alexandros Toumpakaris, Hui-Ling Lou, Chris Cheng-Chieh Lee
  • Patent number: 8085877
    Abstract: Methods and systems for a quadrature local oscillator generator utilizing a DDFS for extremely high frequencies. Aspects of one method may include utilizing the DDFS to generate a first signal that may comprise an in-phase (I) component and a quadrature phase (Q) component. A base signal may be divided to generate a second signal with an in-phase (I) component and a quadrature phase (Q) component. The I and Q components of the first and second signals may be mixed by a plurality of mixers, and the outputs of the mixers may be combined to generate an in-phase component of a local oscillator signal and a quadrature phase component of the local oscillator signal. The frequency of the local oscillator signal may be controlled by inverting or not inverting outputs of one or more of the mixers.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: December 27, 2011
    Assignee: Broadcom Corporation
    Inventor: Ahmadreza Rofougaran
  • Patent number: 8068563
    Abstract: Methods and systems for correcting a frequency error in a digital portion of a radio broadcast signal are disclosed. The methods and systems include the steps of receiving a radio broadcast signal having an analog portion and a digital portion, separating the analog portion of the radio broadcast signal and the digital portion of the radio broadcast signal, determining a coarse frequency offset of the analog portion of the radio broadcast signal, generating an error signal for adjusting a frequency of the digital portion of the radio broadcast signal, wherein the error signal is based on the coarse frequency offset of the analog portion of the radio broadcast signal, and adjusting the frequency of the digital portion of the radio broadcast signal with the error signal that is based on the coarse frequency offset of the analog portion of the radio broadcast signal, such that a frequency error in the digital portion of the radio broadcast signal is reduced below a predetermined amount.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: November 29, 2011
    Assignee: iBiquity Digital Corporation
    Inventors: Michael Nekhamkin, Sivakumar Thulasingam
  • Patent number: 8060051
    Abstract: In a radio communication apparatus, a frequency offset calculator of the radio communication apparatus calculates a frequency offset of the received radio signal from the reception frequency of the radio communication apparatus. An averaging unit averages the frequency offset calculated by the frequency offset calculator. A moving speed calculator calculates the moving speed of an associated radio communication apparatus with which the radio communication apparatus is communicating, based on the frequency offset calculated by the frequency offset calculator. An averaging time changer changes an averaging time for which the frequency offset is averaged by the averaging unit, in accordance with the moving speed of the associated radio communication apparatus calculated by the moving speed calculator.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: November 15, 2011
    Assignee: Fujitsu Limited
    Inventor: Takato Ezaki
  • Patent number: 8060040
    Abstract: A sub-threshold transistor bridge circuit for use in detecting the signal level of an input radio-frequency signal is disclosed. In an exemplary embodiment each branch of the sub-threshold transistor bridge circuit comprises a transistor configured to operate in the sub-threshold region over a predetermined range of input signal levels. An input radio-frequency signal applied to a first pair of opposing corners of the bridge circuit yields a bridge output signal at the remaining pair of opposing corners that has a low-frequency component substantially proportional to the squared-amplitude of the envelope of the input radio-frequency signal. Also disclosed are various detector circuits including a sub-threshold transistor bridge circuit, as well as methods for detecting a signal level for an radio-frequency signal using a sub-threshold transistor bridge.
    Type: Grant
    Filed: August 18, 2008
    Date of Patent: November 15, 2011
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Torkel Arnborg
  • Publication number: 20110250859
    Abstract: Performing a decoding mode of a frequency modulation (FM) signal for an adaptive FM radio receiver includes passing the FM signal through a FM demodulator to obtain a composite signal that includes a pilot signal and noise around the pilot signal, passing the composite signal through a band bass filter, filtering the pilot signal from the noise using a pilot and noise separator that includes a notch filter that filters the pilot signal from the noise, obtaining average amplitudes of the pilot signal and the noise, comparing a ratio between the average amplitudes of the pilot signal and the noise with a programmable threshold, and selecting a decoding mode and an audio low pass filter. The decoding mode is selected based on a quality of the pilot signal being decoded and the audio LPF is selected based on the comparison ratio.
    Type: Application
    Filed: April 13, 2010
    Publication date: October 13, 2011
    Applicant: NEWPORT MEDIA, INC.
    Inventor: Yongru Gu
  • Patent number: 8027652
    Abstract: A radio front end utilizes at least one band pass filter to pass only the appropriate frequency band. Once the desired frequency band has been isolated it is converted to a digital format in an analog to digital converter and a digital signal processing device interprets the signal.
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: September 27, 2011
    Assignee: Continental Automotive Systems US, Inc.
    Inventor: Stephen K. Gilbert