Undesired Signal Or Noise Control (e.g., Antistatic) Patents (Class 455/283)
  • Patent number: 10063363
    Abstract: A intelligent backhaul radio is disclosed, which can operate by zero division duplexing for use in PTP or PMP topologies, providing for significant spectrum usage benefits among other benefits. Specific system architectures and structures to enable active cancellation of multiple transmit signals at multiple receivers within a MIMO radio are disclosed. Further disclosed aspects include the adaptive optimization of cancellation parameters or coefficients.
    Type: Grant
    Filed: October 12, 2016
    Date of Patent: August 28, 2018
    Assignee: SKYLINE PARTNERS TECHNOLOGY LLC
    Inventors: Kevin J. Negus, James A. Proctor, Jr.
  • Patent number: 9847776
    Abstract: A system may include a driver circuit configured to receive a clock signal. The system may also include a first tuned circuit and a second tuned circuit. The first tuned circuit and the driver circuit may be collectively tuned according to a first frequency range. The first tuned circuit may be configured to be active when a rate of the clock signal is within the first frequency range and to be inactive when the rate is outside of the first frequency range. Further, the second tuned circuit and the driver circuit may be collectively tuned according to a second frequency range that is different from the first frequency range. The second tuned circuit may be configured to be active when the rate is within the second frequency range and to be inactive when the rate is outside of the second frequency range.
    Type: Grant
    Filed: July 14, 2014
    Date of Patent: December 19, 2017
    Assignee: FINISAR CORPORATION
    Inventors: Georgios Kalogerakis, The'linh Nguyen, Timothy G. Moran
  • Patent number: 9490918
    Abstract: A intelligent backhaul radio is disclosed, which can operate by zero division duplexing for use in PTP or PMP topologies, providing for significant spectrum usage benefits among other benefits. Specific system architectures and structures to enable active cancellation of multiple transmit signals at multiple receivers within a MIMO radio are disclosed. Further disclosed aspects include the adaptive optimization of cancellation parameters or coefficients.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: November 8, 2016
    Assignee: CBF Networks, Inc.
    Inventors: Kevin J. Negus, James A. Proctor, Jr.
  • Patent number: 9432786
    Abstract: This document discusses, among other things, a MIC audio noise filtering system configured to detect MIC audio noise at a pole of a four-pole audio jack using first and second comparators. The MIC audio noise detection system can include first and second comparators configured to compare a value of the pole to respective first and second thresholds and to provide an output indicative of the comparisons and a detection circuit configured to count changes in the output over a first period of time and to detect MIC audio noise at the pole of the four-pole audio jack using the count.
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: August 30, 2016
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Seth M. Prentice, Shawn Barden
  • Patent number: 9059767
    Abstract: Embodiments of the present invention disclose a microwave transmission method, apparatus, and system using CCDP and XPIC, and relate to the field of mobile communication technologies. The microwave transmission method includes: sending two channels of service that are corresponding to the same frequency and have different polarization directions, where the two channels of service are paired into one logical group; and when receiving, through a feedback channel, a failure signal sent by another end, closing sending of a channel of service that is indicated by the failure signal. In the embodiments of the present invention, after the failure signal sent by the another end is received, the sending of a channel of the service that is indicated by the failure signal is closed, so that no interference is caused to another channel of service, thus ensuring that another channel of service is received correctly.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: June 16, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Xuekun Zhang
  • Patent number: 8977226
    Abstract: A mobile terminal including a transceiver having a plurality of output terminals; a plurality of power amplifier units respectively connected to the plurality of output terminals, and configured to amplify a first or second signal output by the output terminals and to output the amplified first or second signal to a plurality of antennas respectively connected the plurality of power amplifiers; and a receiving module configured to receive a third signal through a receiving antenna disposed to be spaced apart from the plurality of antennas and to output the received third signal to the transceiver. Further, the receiving module includes first and second filters configured to control an intermodulation distortion (IMD) signal included in the third signal due to the output of the first or second signal.
    Type: Grant
    Filed: January 2, 2013
    Date of Patent: March 10, 2015
    Assignee: LG Electronics Inc.
    Inventor: Hoonyong Kim
  • Patent number: 8855591
    Abstract: A wireless telemetry module and associated method reject interference in a received signal. The wireless telemetry module includes an antenna receives a communication signal transmitted at a desired channel frequency and having a channel bandwidth. A transceiver is controlled to operate in receiving and transmitting modes by a processor. An interference rejection module receives control signals from the processor corresponding to the desired channel frequency and is coupled between the antenna and the transceiver when the transceiver is operating in the receiving mode.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: October 7, 2014
    Assignee: Medtronic, Inc.
    Inventors: Michael E. Nowak, William D. Verhoef, Eric D. Corndorf
  • Patent number: 8837332
    Abstract: A method for full duplex communication that includes creating a canceling self interference signal using a passive noise cancellation, and attaining full-duplex simultaneous in time and overlapping in space wireless transmission and reception on same frequency band responsive to the step of creating a canceling self interference signal.
    Type: Grant
    Filed: December 13, 2011
    Date of Patent: September 16, 2014
    Assignee: NEC Laboratories America, Inc.
    Inventors: Mohammad A. Khojastepour, Karthikeyan Sundaresan, Sampath Rangarajan
  • Patent number: 8824987
    Abstract: A squelch detector includes a first circuit, a second circuit, and a comparator. The first circuit is configured to receive a first pair of differential input signals and in response output a second pair of differential signals. The second pair of differential signals have higher voltages than the first pair of differential input signals. The second circuit is coupled to the first circuit and is configured to extract first and second voltage levels from the second pair of differential signals. The comparator is configured to output a squelch level signal based on a comparison of the first voltage level and a third voltage level. The third voltage level is based on the second voltage level and a reference voltage.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: September 2, 2014
    Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
    Inventor: Hao-Jie Zhan
  • Patent number: 8787861
    Abstract: In some implementations, an apparatus includes an echo canceller that generates an echo interference compensation signal that compensates for an echo interference signal in a communication signal, a crosstalk canceller that generates a crosstalk interference compensation signal that compensates for a crosstalk interference signal in the communication signal, and a combiner that generates a combined interference compensation signal based on the echo interference compensation signal and the crosstalk interference compensation signal.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: July 22, 2014
    Assignee: Marvell International Ltd.
    Inventors: Xiaopeng Chen, Runsheng He
  • Patent number: 8761709
    Abstract: A receiver 650 operates in close proximity to at least one other component 610, 611, 612 causing interferences in signals received by the receiver 650. It is determined (steps 2002; 2003) whether and at which frequency a higher harmonic of and/or an inter-modulation product with signals generated by the other component 610 causes interference in signals received by the receiver 650, based on information about signals generated by the other component 610, 611, 612. At least one characteristic of the receiver 650 is adjusted to diminish an influence by a determined interference.
    Type: Grant
    Filed: March 1, 2006
    Date of Patent: June 24, 2014
    Assignee: Nokia Corporation
    Inventors: Marko Leinonen, Juha Valtanen, Seppo Rousu
  • Patent number: 8755761
    Abstract: The present invention reduces the degradation in performance of one or more radio signals that are co-transmitted with a first radio signal from the same transmitting antenna in the same frequency channel and received by the same antenna due to multipath or other shared interference, where the one or more radio signals can be separated from the first radio signal. All received signals are coupled to the same adaptive array or adaptive filter to reduce multipath or other shared interference of the first radio signal, which reduces multipath and other shared interference in the other radio signals before they are separated and processed by their respective receivers, or the individual radio signals are separated before the first signal enters the adaptive array and coupled to a slave weighting network slaved to the weights of the adaptive array of the first signal to reduce interference in all the signals.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: June 17, 2014
    Inventor: Kenneth F. Rilling
  • Patent number: 8737456
    Abstract: Methods and apparatus are disclosed, such as those involving mixed-mode signaling that includes transmitting a differential signal and a common mode signals over the same pair of interconnect traces. One such apparatus includes a first transmitter configured to transmit a differential signal through a pair of electrically conductive lines in a first direction. The differential signal has a first frequency and carries electronic data. The apparatus further includes a second transmitter configured to transmit a common mode signal through the pair of electrically conductive lines in the first direction. The common mode signal is superimposed onto each of the differential signal. The common mode signal has a second frequency that is lower than the first frequency and carries a control signal. This configuration reduces the number of lines and pins on electronic circuits, thereby saving space thereon.
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: May 27, 2014
    Assignee: Micron Technology, Inc.
    Inventor: Timothy M. Hollis
  • Patent number: 8693528
    Abstract: In one or more embodiments, a circuit is configured to receive a differential signal from a transmitter that is isolated from the receiver circuit and that includes a common-mode suppression circuit and signal combining circuit coupled to the corresponding lines carrying the differential signals. The common-mode suppression and signal combining circuits are configured to suppress common-mode signals of differential signals communicated on the set of differential signal lines and combine to form of differential-mode components of the differential signals.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: April 8, 2014
    Assignee: NXP B.V.
    Inventors: Rameswor Shrestha, Hendrik Boezen, Martin Bredius
  • Patent number: 8666343
    Abstract: Static and dynamic DC offsets in receivers may be cancelled in two stages using a digitally implemented offset-correction loop.
    Type: Grant
    Filed: September 15, 2009
    Date of Patent: March 4, 2014
    Assignee: Analog Devices, Inc.
    Inventor: Hyman Shanan
  • Patent number: 8660508
    Abstract: An electronic device comprising a passive harmonic-rejection mixer (400) and a calibration circuitry (425). The passive harmonic rejection mixer has an input (102) connected to several sub-mixer stages (402), and the sub-mixer stages are connected to a summing module (406, 408) for generating the output (104). Each sub-mixing stage comprises a gating module (414), an amplifier (416), and a weighting module (418), the gating module selectively passing the input signal or the input signal with inverted polarity under the control of control signals. The calibration circuitry (425) is adapted to input a reference signal (430) to the input of the mixer, receive an output signal (104) from the output of the mixer, and set the weights (K1, K2, K3, K4) of the weighting modules to make the output signal match an expected output signal.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: February 25, 2014
    Assignee: NXP, B.V.
    Inventors: Dennis Jeurissen, Gerben Willem de Jong, Jan van Sinderen, Johannes Hubertus Antonius Brekelmans
  • Patent number: 8594603
    Abstract: In some embodiments, systems and methods for cancelling interferers in a receiver, comprise: a first mixer in a main path that downconverts a first RF signal to form a main baseband or intermediate-frequency signal; and a second mixer in an alternate path that downconverts a second RF signal to form an alternate baseband or intermediate-frequency signal, wherein the first RF signal and the second RF signal are both based on a third RF signal, and wherein the main baseband or intermediate-frequency signal and the alternate baseband or intermediate-frequency signal, when combined, cancel out an interferer in the third RF signal.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: November 26, 2013
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Ajay Balankutty, Peter Kinget
  • Patent number: 8583068
    Abstract: The present invention reduces the degradation in performance of one or more radio signals that are co-transmitted with a first radio signal from the same transmitting antenna in the same frequency channel and received by the same antenna due to multipath or other shared interference, where the one or more radio signals can be separated from the first radio signal.
    Type: Grant
    Filed: November 5, 2012
    Date of Patent: November 12, 2013
    Inventor: Kenneth F. Rilling
  • Patent number: 8565711
    Abstract: A SAW-less receiver includes an FEM interface module, an RF to IF receiver section, and a receiver IF to baseband section. The RF to IF receiver section includes a mixing module, a mixed buffer section, and a frequency translated BPF (FTBPF) circuit module. The mixing module converts an inbound RF signal into an in-phase (I) mixed signal and a quadrature (Q) mixed signal. The mixed buffer section filters and buffers the I mixed signal and filter and buffer the Q mixed signal. The FTBPF circuit module frequency translates a baseband filter response to an IF filter response such that the FTBPF circuit module filters undesired signal components of the IF I signal and the IF Q signal to produce an inbound IF signal. The receiver IF to baseband section converts the inbound IF signal into one or more inbound symbol streams.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: October 22, 2013
    Assignee: Broadcom Corporation
    Inventors: Ahmad Mirzaei, Hooman Darabi
  • Publication number: 20130210377
    Abstract: A wireless communication device (100) carries out diversity reception and a noise cancellation process, and a signal combining section (combining circuit (123)) combines a plurality of received signals in a case where the diversity reception is carried out and combines a received signal and a noise signal in the noise cancellation process.
    Type: Application
    Filed: December 19, 2011
    Publication date: August 15, 2013
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Toshinori Kondo, Hiroyuki Takebe
  • Patent number: 8494473
    Abstract: Circuitry and a method for use in a radio frequency receiver for processing a radio frequency signal are provided. The circuitry comprises a mixer arranged to receive the radio frequency signal and down-convert the received radio frequency signal to a lower frequency. The received radio frequency signal has an interference component and the interference component in the down-converted signal is within an interference frequency range. The circuitry also comprises an LC based notch filter arranged to receive the down-converted signal from the mixer, filter the down-converted signal, and output the filtered signal for processing by a baseband processing block. The LC based notch filter has a notch centered within said interference frequency range, such that the LC based notch filter is arranged to attenuate the interference component in the down-converted signal.
    Type: Grant
    Filed: April 19, 2011
    Date of Patent: July 23, 2013
    Assignee: Icera Inc.
    Inventors: Mehmet T. Ozgun, Essam Atalla
  • Patent number: 8442470
    Abstract: A system includes a weighting module, a mixer module, and a frequency selective impedance (FSI). The weighting module is configured to receive an input signal having an amplitude and to generate weighted outputs. Amplitudes of the weighted outputs have ratios relative to the amplitude of the input signal. The mixer module has switches configured to receive the weighted outputs and to generate a staircase waveform when the switches are clocked by clock signals. Amplitudes of steps of the staircase waveform are based on the ratios. The FSI is configured to communicate with the switches. The switches are configured to translate an impedance of the FSI centered on a first frequency to a second frequency determined by a frequency of the clock signals.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: May 14, 2013
    Assignee: Marvell International Ltd.
    Inventors: Cao-Thong Tu, David Cousinard, Frederic Declercq
  • Patent number: 8428540
    Abstract: A communication apparatus includes an I and Q digital values table that stores values of I and Q, which are parameters for noise cancellation determined in advance, for each of reception channels. The communication apparatus reads out parameters for noise cancellation corresponding to a reception channel from the I and Q digital values table. Subsequently, the communication apparatus cancels a noise signal from a reception signal using the read-out parameters for noise cancellation.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: April 23, 2013
    Assignee: Fujitsu Limited
    Inventors: Akira Shiba, Shinichi Shiotsu
  • Patent number: 8400234
    Abstract: An apparatus for removing a leakage signal includes a coupler including a transmission port through which a transmission signal is input, an antenna port through which the transmission signal is output to an antenna and a receiving signal is input from the antenna, and a receiving port through which the receiving signal is output; and a removing unit which outputs, to the receiving port, a leakage removing signal having a same magnitude as one of or a sum of a magnitude of a first leakage signal of the transmission signal, which is generated at the transmission port and input to the receiving port, and a magnitude of a second leakage signal of the transmission signal which is input to the receiving port through the antenna port, the leakage removing signal having an opposite phase to one of the phases or an aggregate phase of the first and second leakage signals.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: March 19, 2013
    Assignees: Samsung Techwin Co., Ltd., Sungkyunkwan University Foundation for Corporate Collaboration
    Inventors: Young-goo Yang, Min-su Kim, Sung-chan Jung
  • Patent number: 8380156
    Abstract: A mobile wireless communications device includes a circuit board carried by a housing. A microprocessor, RF transceiver and circuitry are carried by the circuit board and operative with each other. Clock buffer circuitry is carried by the circuit board and connected to the RF transceiver and circuitry and microprocessor for isolating a clock signal from the noise of the microprocessor and allowing greater isolation for the RF transceiver from RF circuitry.
    Type: Grant
    Filed: January 24, 2012
    Date of Patent: February 19, 2013
    Assignee: Research In Motion Limited
    Inventors: Lizhong Zhu, Robert Grant
  • Patent number: 8369864
    Abstract: The present invention provides a method for interference cancellation in a wireless communication system. One embodiment of a method includes accessing information indicative of one or more first signals transmitted by one or more first mobile units from one or more first sectors. The method also includes accessing information indicative of one or more second signals transmitted by one or more second mobile units from one or more second sectors different than the first sectors. The method further includes canceling interference caused in the second signal(s) by the first signal(s) using the accessed information indicative of the first signal(s) and the second signal(s). The method also includes jointly scheduling and allocating resources to one or more mobile stations in one or more sectors of one or more base stations.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: February 5, 2013
    Assignee: Alcatel Lucent
    Inventor: Ashok N. Rudrapatna
  • Patent number: 8363707
    Abstract: Methods and apparatus are disclosed, such as those involving mixed-mode signaling that includes transmitting a differential signal and a common mode signals over the same pair of interconnect traces. One such apparatus includes a first transmitter configured to transmit a differential signal through a pair of electrically conductive lines in a first direction. The differential signal has a first frequency and carries electronic data. The apparatus further includes a second transmitter configured to transmit a common mode signal through the pair of electrically conductive lines in the first direction. The common mode signal is superimposed onto each of the differential signal. The common mode signal has a second frequency that is lower than the first frequency and carries a control signal. This configuration reduces the number of lines and pins on electronic circuits, thereby saving space thereon.
    Type: Grant
    Filed: March 21, 2008
    Date of Patent: January 29, 2013
    Assignee: Micron Technology, Inc.
    Inventor: Timothy M. Hollis
  • Patent number: 8339295
    Abstract: A method and system for managing Digital to Time Conversion (DTC) is provided. The method comprises receiving a first Radio Frequency (RF) signal and a second RF signal. The second RF signal is a phase-shifted first RF signal. The method further comprises converting the first RF signal to a first Intermediate Frequency (IF) signal and the second RF signal to a second IF signal. Further, a time delay between the first IF signal and the second IF signal is estimated based on a time difference measurement technique. The second RF signal is processed based on the estimated time delay to compensate for a delay error associated with the second RF signal.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: December 25, 2012
    Assignee: Motorola Solutions, Inc.
    Inventors: Geetha B. Nagaraj, Nicholas G. Cafaro, Ralf Hekmann, Robert E. Stengel, Scott Miller
  • Patent number: 8326251
    Abstract: A mobile device receives a radio frequency (RF) signal, comprising a physical signal such as a primary synchronization signal (PSS), from a serving base station. Two successive samples derived from the received physical signal such as a PSS are selected to generate a single phasor. A receiver frequency offset for the received RF signal is estimated utilizing the generated single phasor. A correlation process is performed to detect the received PSS. An angular increment in the first quadrant is calculated utilizing the generated single phasor. An actual angular increment subject to the receiver frequency offset is calculated based on the angular increment in the first quadrant and signs of real and imaginary components of the generated single phasor. The receiver frequency offset is determined based on the calculated actual angular increment and is utilized to adjust a reference or local oscillator frequency of the mobile device.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: December 4, 2012
    Assignee: Broadcom Corporation
    Inventors: Francis Swarts, Mark Kent
  • Patent number: 8315584
    Abstract: A semiconductor integrated circuit for broadcast receivers, which integrates an RF circuit, a mixer, an IF circuit, and an intermediate-frequency signal processing circuit onto a single chip, additionally includes a second RF circuit whose input terminal is grounded through an impedance equivalent to or almost the same as the output impedance of an antenna circuit, and a second mixer downstream of the second RF circuit. The second RF circuit and the second mixer each has an input impedance equivalent to that of the received signal subsystem; therefore, a spurious component equivalent to the spurious component contained in the output signal of the received signal subsystem is detected in the second RF circuit and in the second mixer, and cancels out the spurious component contained in the output signal of the received signal subsystem. Accordingly, the effects of noise due to spurious can be effectively reduced.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: November 20, 2012
    Assignee: Panasonic Corporation
    Inventor: Yasuo Oba
  • Patent number: 8311505
    Abstract: The present invention reduces the degradation in performance of one or more radio signals that are co-transmitted with a first radio signal from the same transmitting antenna in the same frequency channel and received by the same antenna due to multipath or other shared interference, where the one or more radio signals can be separated from the first radio signal.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: November 13, 2012
    Inventor: Kenneth F Rilling
  • Patent number: 8295495
    Abstract: An FM audio receiver can include a mono/stereo detector that causes the audio receiver to output either a monophonic or a stereophonic signal based on a received pilot tone energy. An accurate operation of the receiver, including but not limited to correct decoding of monophonic/stereophonic reception, can be based on the receiver operating with the same rated maximum system deviation (RMSD) as the received signal itself. Aspects of the disclosure describe a system and method of detecting and matching a receiver's RMSD to that of a received signal by demodulating a carrier bearing a an input signal over a first bandwidth, extracting a pilot energy signal from the input signal, and demodulating the carrier bearing the input signal over a second bandwidth if the pilot energy signal is within a pilot energy range for a first predetermined amount of time.
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: October 23, 2012
    Assignee: Marvell International Ltd.
    Inventor: Chris Cheng-Chieh Lee
  • 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: 8270927
    Abstract: Systems and techniques for adaptive interference filtering in a communications device are disclosed. The communications device may include a transmitter, a receiver, a duplexer coupled to the transmitter and the receiver, and an adaptive filter disposed between the duplexer and the receiver. A processor may be configured to monitor cross modulation in the receiver between transmitter leakage through the duplexer and a jammer, and adapt the filter to vary its transmit signal rejection as a function of the cross modulation.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: September 18, 2012
    Assignee: QUALCOM, Incorporated
    Inventors: Raymond C. Wallace, Charles E. Wheatley, III, Stanley Slavko Toncich
  • Patent number: 8260227
    Abstract: A direct conversion receiver and a DC offset cancellation method are provided. An RF module receives a transmission signal to generate an RF signal. A mixer converts the RF signal to a mixer output comprising baseband and imaginary parts. A filter module filters out the imaginary part of the mixer output and adjusts gain of the baseband part to generate a baseband signal. A calibrator performs a calibration to determine a mismatch value of the mixer. A static DC offset canceller provides a constant offset compensation according to the mismatch value; wherein the mismatch value is used to minimize component mismatching effects of the mixer.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: September 4, 2012
    Assignee: Mediatek Inc.
    Inventor: Chinq-Shiun Chiu
  • Patent number: 8249536
    Abstract: An apparatus and method for removing a transmission leakage signal are provided. The apparatus includes: a directional coupler connecting an antenna to a transmission path and a reception path; and a reflection coefficient adjustment unit outputting a reflection signal to the reception path, the reflection signal having the same amplitude as and opposite phase to a first transmission leakage signal generated from the transmission path and input to the reception path and a second transmission leakage signal reflected by the antenna and input to the reception path.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: August 21, 2012
    Assignees: Samsung Techwin Co., Ltd., Sungkyunkwan University Foundation for Corporate Collaboration
    Inventors: Sung-chan Jung, Su-kyum Kim, Young-goo Yang
  • Patent number: 8208857
    Abstract: A method for successive interference cancellation in code division multiple access (CDMA) systems is provided that uses variable interferer weights. This method allows interfering signals to be cancelled in order to recover a transmitted data signal. This method involves receiving the data signal subject to interference from at least one interfering signal. A first interfering signal is identified. Then an interferer weight coefficient associated with the first interfering signal is generated. This allows the first interfering signal to be cancelled from the received data signal using the interferer weight coefficient. These processes may then be reiterated for other interfering signals. It is then possible to recover the transmitted data signal from the received data signal.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: June 26, 2012
    Assignee: Broadcom Corporation
    Inventors: Arie Heiman, Arkady Molev-Shteiman
  • Patent number: 8195095
    Abstract: A system, method, and computer-usable medium for mitigating audible acknowledgement volume in a vehicle security system. A preferred embodiment of the present invention includes measuring an amplitude of a valid signal, in response to receiving the valid signal; in response to determining the amplitude of the valid signal, comparing the amplitude to a first predetermined threshold; in response to the comparison, adjusting a volume setting of an audible acknowledgement; further adjusting the volume setting in response to measuring ambient noise of a surrounding location; and emitting the audible acknowledgement.
    Type: Grant
    Filed: May 19, 2006
    Date of Patent: June 5, 2012
    Assignee: International Business Machines Corporation
    Inventors: Timothy R. Chavez, Dustin Kirkland
  • Patent number: 8175535
    Abstract: Active transmitter leakage cancellation techniques are disclosed, for reducing transmitter leakage in a frequency-duplexing radio transceiver. Reducing transmitter leakage to the receiver path of a duplex transceiver eases the linearity requirements for low-noise amplifier and mixer circuits, potentially reducing transceiver cost as well as complexity. In an exemplary method, a radio-frequency (RF) cancellation signal is generated from a transmitter signal, and the RF cancellation signal is combined with a received RF signal to obtain a combined RF signal comprising a residual transmitter leakage component. The residual transmitter leakage component of the combined RF signal is converted, using, e.g., a frequency mixer, to obtain a down-converted signal at baseband or at an intermediate frequency.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: May 8, 2012
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Fenghao Mu
  • Patent number: 8126418
    Abstract: A wireless telemetry module and associated method reject interference in a received signal. The wireless telemetry module includes an antenna receives a communication signal transmitted at a desired channel frequency and having a channel bandwidth. A transceiver is controlled to operate in receiving and transmitting modes by a processor. An interference rejection module receives control signals from the processor corresponding to the desired channel frequency and is coupled between the antenna and the transceiver when the transceiver is operating in the receiving mode.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: February 28, 2012
    Assignee: Medtronic, Inc.
    Inventors: Michael E. Nowak, William D. Verhoef, Eric D. Corndorf
  • Patent number: 8121571
    Abstract: A transceiver device that performs an intercept point calibration using signal interferers is described. The signal interferers include at least self-generated signal interferers or opportunistic signal interferers in surrounding areas. Due to non-linearity in the transceiver device, intermodulation distortion (IMD) signal components are generated. Filtering of the IMD signal components is performed to allow low-frequency components, such as a second order intermodulation (IM2) to pass through. A dynamic minimization algorithm is performed to minimize distortion effects of the low-frequency components.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: February 21, 2012
    Inventors: Igal Kushnir, Ofir Degani, Lior Kravitz, Alexander Rivkind
  • Patent number: 8116716
    Abstract: A mobile wireless communications device includes a circuit board carried by a housing. A microprocessor, RF transceiver and circuitry are carried by the circuit board and operative with each other. Clock buffer circuitry is carried by the circuit board and connected to the RF transceiver and circuitry and microprocessor for isolating a clock signal from the noise of the microprocessor and allowing greater isolation for the RF transceiver from RF circuitry.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: February 14, 2012
    Assignee: Research In Motion Limited
    Inventors: Lizhong Zhu, Robert Grant
  • Patent number: 8098779
    Abstract: Techniques for detecting and mitigating interference are described. A device (e.g., a cellular phone) senses interference levels and digitally reconstructs the expected interference in the received signal. The device may correlate the reconstructed interference with the received signal and determine interference in the received signal based on correlation results. The device may adjust the operation of one or more circuit blocks (e.g., a mixer, an LNA, etc.) in a receiver based on the detected interference in the received signal. Alternatively or additionally, the device may condition the digital interference to obtain conditioned reconstructed interference matching the interference in the received signal and may then subtract the conditioned interference from the received signal.
    Type: Grant
    Filed: December 9, 2008
    Date of Patent: January 17, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Christos Komninakis, Daniel F. Filipovic
  • Patent number: 8093841
    Abstract: An audio receiver may include a mono/stereo detector that causes the audio receiver to output either a monophonic or a stereophonic signal based on a difference between a pilot energy signal and a filtered pilot energy signal. The audio receiver includes a filter that filters the pilot energy signal to generate a filtered pilot energy signal, wherein a variable leakage factor associated with the filter is used to minimize a noise level of the filtered pilot energy signal and to reduce a response time of the audio receiver.
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: January 10, 2012
    Assignee: Marvell International Ltd.
    Inventor: Chris Cheng-Chieh Lee
  • Patent number: 8037338
    Abstract: A data interface method includes differentially amplifying differential data signals based on a mode control signal indicating a first mode, transmitting the amplified differential data signals to a receiving semiconductor device via first and second transmission lines, and driving one of the differential data signals and a strobe signal to the first and second transmission lines, respectively, based on the mode control signal indicating a second mode, for transmitting the one of the differential data signals and the strobe signal to the receiving semiconductor device. The receiving semiconductor device samples the received differential data signals according to differential signaling, in response to a controlled sampling clock signal based on the mode control signal indicating a first mode; and samples the one of the differential data signals in response to a strobe signal, received from the transmitting semiconductor device, based on the mode control signal indicating a second mode.
    Type: Grant
    Filed: April 23, 2008
    Date of Patent: October 11, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Kyong Su Lee
  • 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: 8019305
    Abstract: The present invention reduces the degradation in performance of one or more radio signals that are co-transmitted with a first radio signal from the same transmitting antenna in the same frequency channel and received by the same antenna due to multipath or other shared interference, where the one or more radio signals can be separated from the first radio signal.
    Type: Grant
    Filed: March 3, 2009
    Date of Patent: September 13, 2011
    Inventor: Kenneth F Rilling
  • Patent number: 8000669
    Abstract: A system for detecting and removing undesirable noise, such as beats and tones, from radio signals. The system includes a manual oscillator that is a manually tuned by a user to a selected manual frequency from one of a plurality of frequencies. An electronic oscillator is electronically tuned to a selected electronic frequency from one of the plurality of frequencies. A processor isolates and stores at least one interference frequency associated the selected electronic frequency and determines a correction signal to correct any interference frequencies within a particular selected electronic frequency. The selected manual frequency is corrected using the determined correction signal for the particular selected electronic frequency when the selected manual frequency is the same as the particular selected electronic frequency.
    Type: Grant
    Filed: March 10, 2008
    Date of Patent: August 16, 2011
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Mohammad Reza Sheikh-Movahhed, Shaun David Kalinowski
  • Patent number: 7995989
    Abstract: Disclosed are methods and apparatus to control the actions of a user terminal (UT) located at a remote location, possibly far from a gateway (GW), which has an interface to the Public Switched Telephone Network (PSTN) and/or to the Internet. The methods and apparatus provide for operation of a mobile satellite communication system having at least one gateway (GW), at least one user terminal (UT), and a constellation of satellites. The methods and apparatus allow access to the communication satellites by specifying an exclusion zone having a confidence limit (CL) associated therewith. The methods and apparatus selectively provide service to a UT depending on a determined location of the UT relative to the exclusion zone and on an estimated error (E) of the determined UT location, wherein location of the UT is determined by the UT, and transmitted to the GW, or location of the UT is determined by the GW.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: August 9, 2011
    Assignee: Globalstar, Inc.
    Inventors: Robert A. Wiedeman, Paul A. Monte, Michael J. Sites
  • Patent number: 7979045
    Abstract: An analog die (3) and a digital die (4) are supported by a plate (1) consisting of an electrically conductive material. Pads (5) of the dies (3, 4) are connected to each other, to plate (1) or to pins (2) surrounding the latter by bond wires (6). The upper side of the plate (1) is covered by a plastic mold (7) encapsulating the dies (3, 4), the bond wires (6) and, in part, the pins (2). For the suppression of external jamming signals as well as internal ones picked up by bond wires the digital die (4) comprises an adjustable notch filter which suppresses narrow frequency bands where jamming signals have been detected.
    Type: Grant
    Filed: October 13, 2006
    Date of Patent: July 12, 2011
    Assignee: U-Blox AG
    Inventors: Eric De Mey, Andreas Thiel