Using Plural Separate Signal Paths Patents (Class 455/303)
  • Patent number: 10424308
    Abstract: An audio sound signal encoding device includes: a converter that adds up all multiple channel signals included in multichannel voice sound input signals to generate an addition signal and generates a difference signal between channels of the multiple channel signals; a first encoder that encodes the addition signal in a coding mode in accordance with a characteristic of the addition signal to generate first encoded data; a second encoder that encodes the difference signal in the coding mode that was used for encoding the addition signal, to generate second encoded data; and a multiplexer that multiplexes the first encoded data and the second encoded data to generate multichannel encoded data.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: September 24, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
    Inventors: Hiroyuki Ehara, Takanori Aoyama
  • Patent number: 10317176
    Abstract: Modern military aircraft are prime targets for surface to air and air to air RF guided missiles. Modern missile systems in particular are difficult to counter and have an array of Electronic Protection Measures at their disposal. Expendable Active Decoys provide effective protection for fast jet platforms by creating a realistic false target that seduces the missile away from the protected platform. They can be fitted to almost all military platforms as they are expended from standard chaff and flare dispensers. Simple repeater devices have been produced in the past but they lack the sophistication to defeat modern threats. Digital RF Memory based jammers have the necessary capability but have always been too large due to their complexity. A system architecture, design features and technologies are disclosed to reduce the size of a Digital RF Memory 12 based jammer to fit within a volume 0.5 l.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: June 11, 2019
    Assignee: LEONARDO MW LTD
    Inventor: Geoff Tithecott
  • Patent number: 10194518
    Abstract: This disclosure describes systems, methods, and apparatus for frequency tuning a power source so as to optimize power delivery to a plasma load as well as systems, methods, and apparatus for identifying characteristics and/or changes in characteristics of a plasma load. In particular, a secondary power signal can be applied concurrently with a primary power signal, the secondary power signal having a substantially lower power level, so as to tune for a global optimum of a measure of performance and/or identifying characteristics and/or changes in characteristics of a plasma load. The secondary power signal can comprise a low level signal that is jointly generated with or combined with the primary power signal, or it can comprise noise either inherent to the primary power signal or added to the primary power signal.
    Type: Grant
    Filed: November 16, 2017
    Date of Patent: January 29, 2019
    Assignee: Advanced Energy Industries, Inc.
    Inventor: Gideon Van Zyl
  • Patent number: 10153924
    Abstract: A method for performing self-interference cancellation by a communication device which uses an FDR mode can comprise the steps of: measuring the strength of a residual self-interference signal, after antenna and analog self-interference cancellation, for each subband with respect to a predetermined number of subbands configured in a communication device; determining the order of a nonlinear self-interference signal component, to be considered for channel estimation of a nonlinear self-interference signal, for each subband on the basis of the strength of the residual self-interference signal that has been measured for each subband; and performing channel estimation of the nonlinear self-interference signal on the basis of the order that has been determined for each subband.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: December 11, 2018
    Assignee: LG Electronics Inc.
    Inventors: Dongkyu Kim, Hyunsoo Ko, Kwangseok Noh, Sangrim Lee, Hojae Lee
  • Patent number: 10128876
    Abstract: A digital microwave radio system includes a splitter that splits a common baseband input into two baseband outputs, first and second transmitters, each transmitter electrically connected to a baseband output of the splitter via a mixer, a common local oscillator electrically connected to the mixer of the first transmitter and the mixer of the second transmitter via an adjustable phase shifter, respectively, and a combiner. The common local oscillator is configured to up-convert each baseband output into a radio-frequency signal using a corresponding mixer. The combiner combines the two radio-frequency signals into a 0-degree phase-shift output and a 180-degree phase-shift output, respectively. A phase error control loop adjusts the phase shifter to minimize the 180-degree phase-shift radio-frequency output. A combiner gain control loop adjusts the output power level of the two transmitters in accordance with an actual power detector reading at the 0-degree phase-shift radio-frequency output.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: November 13, 2018
    Assignee: ZTE CORPORATION
    Inventors: Ying Shen, Andrey Kochetkov, Aleksandr Semenyshev, Shawn Walsh, Thanh Hung Nguyen
  • Patent number: 9854659
    Abstract: This disclosure describes systems, methods, and apparatus for frequency tuning a power source so as to optimize power delivery to a plasma load as well as systems, methods, and apparatus for identifying characteristics and/or changes in characteristics of a plasma load. In particular, a secondary power signal can be applied concurrently with a primary power signal, the secondary power signal having a substantially lower power level, so as to tune for a global optimum of a measure of performance and/or identifying characteristics and/or changes in characteristics of a plasma load. The secondary power signal can comprise a low level signal that is jointly generated with or combined with the primary power signal, or it can comprise noise either inherent to the primary power signal or added to the primary power signal.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: December 26, 2017
    Assignee: Advanced Energy Industries, Inc.
    Inventor: Gideon Van Zyl
  • Patent number: 9734820
    Abstract: A system, method and computer-readable storage device which balance latency and accuracy of machine translations by segmenting the speech upon locating a conjunction. The system, upon receiving speech, will buffer speech until a conjunction is detected. Upon detecting a conjunction, the speech received until that point is segmented. The system then continues performing speech recognition on the segment, searching for the next conjunction, while simultaneously initiating translation of the segment. Upon translating the segment, the system converts the translation to a speech output, allowing a user to hear an audible translation of the speech originally heard.
    Type: Grant
    Filed: November 14, 2013
    Date of Patent: August 15, 2017
    Assignee: Nuance Communications, Inc.
    Inventors: Vivek Kumar Rangarajan Sridhar, Srinivas Bangalore, John Chen
  • Patent number: 9448183
    Abstract: A method and apparatus for testing a number of display devices. Images displayed on the number of display devices are received by a computer system for a platform during a performance of a number of tests at a number of test locations for the platform. A portion of the images from the images are identified as a number of images of interest using a policy.
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: September 20, 2016
    Assignee: THE BOEING COMPANY
    Inventor: Timothy Edward Jackson
  • Patent number: 9407508
    Abstract: A system configured to generate a utilization metric using a plurality of client devices coupled to a network server is disclosed. The system includes a channel condition monitor and a probe packet coordinator located on each client device, the channel condition monitor being configured to gather channel information, the probe packet coordinator being configured to format a packet train containing the channel information, the probe packet coordinator being configured to schedule or control the transmission timing of the packet train. The system also includes a network congestion calculator located at the network server, the network congestion calculator being configured to receive the packet train from each client device and generate a utilization metric based on the packet train received from each client device.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: August 2, 2016
    Assignee: TUBE, Inc.
    Inventors: Mung Chiang, Sangtae Ha, Carlee Joe-Wong, Harjot Singh Saluja, Shantigram Jagannath, Wim Sweldens
  • Patent number: 9008250
    Abstract: A method for canceling adjacent channel interference includes: receiving signal of a first channel, where an interference signal of a second channel remains in the signal of the first channel, and the second channel and the first channel are adjacent channels; receiving a cancellation signal provided by the second channel for canceling the interference signal; filtering the received cancellation signal; adjusting a frequency of the filtered cancellation signal; multiplying the cancellation signal with the adjusted frequency by a gain factor to obtain a signal to be cancelled; and subtracting the signal to be cancelled from the signal of the first channel, and canceling the interference signal to obtain a signal to be decoded. According to the technical solutions provided in the embodiments of the present invention, interference signals of adjacent channels are cancelled, and the signal to noise ratio is improved.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: April 14, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Guixue Zhao
  • Patent number: 8995902
    Abstract: A method for Link 16-based geolocation of hostile jammers comprising the steps of collecting jamming noise I/Q samples at a plurality of locations, determining the relative time delay of reception between two or more of the locations, determining the first derivative of the time delay of reception between the two or more locations, and using the results calculated in the preceding step to determine the position of the hostile jammers.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: March 31, 2015
    Assignee: BAE Systems Information and Electronic System Integration Inc.
    Inventor: Joel D. Reiss
  • Patent number: 8965320
    Abstract: In a method for enabling improved quality for noise limited uplink signals in a radio base station in a telecommunication system, said radio base station comprising a plurality of transceiver units, each comprising at least one receiver unit, adaptively allocating (S10) available transceiver units to enable parallel processing of an identified noise limited signal on at least two separate receiver units in the radio base station. And, combining (S20) the parallel processed noise limited calls to provide a received signal with improved signal to noise ratio.
    Type: Grant
    Filed: November 4, 2008
    Date of Patent: February 24, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Benny Lennartson, Miguel Lopez, Kenneth Sandberg
  • Publication number: 20150050904
    Abstract: Embodiments of a wideband interference mitigation (IM) system with negative group delay (NGD) compensation and method for wideband interference cancellation are generally described herein. In some embodiments, the wideband IM system may include first frequency-selective circuitry to capture interfering signals within a bandwidth of interest from a primary signal path after removal of a desired signal, cancellation circuitry to implement a negative group delay (NGD) on output signals from the first frequency-selective circuitry to generate negative group-delayed signals, and second frequency-selective circuitry to generate interference cancellation signals from the negative group-delayed signals for combining with signals from the primary signal path.
    Type: Application
    Filed: October 18, 2013
    Publication date: February 19, 2015
    Applicant: Raytheon BBN Technologies Corp.
    Inventors: Robert Gyorgy Egri, Jonathan P. Comeau
  • Patent number: 8958493
    Abstract: The present invention relates to a transmitter in a transmission system operable to optimize estimates of a quantity at a receiver for improved operation. The transmission system includes a transmitting unit connected to a number of antennas (Txm), and to control unit. The control unit controls the transmitting unit to initially transmit an initial training/quantity estimation sequence during an initial training/quantity estimation phase and subsequently transmit a sequence of data symbols such that the information rate of the data symbols is progressively increased.
    Type: Grant
    Filed: March 24, 2005
    Date of Patent: February 17, 2015
    Assignee: Infineon Technologies AG
    Inventor: Michael Lewis
  • Patent number: 8923364
    Abstract: In general, the subject matter described in this disclosure can be embodied in methods, systems, and program products for transmitting data over discontiguous portions of radio frequency spectrum. Data that is to be wirelessly transmitted to a remote computing device is received. A first signal that encodes the data across a band of radio frequencies is generated. The first signal is split into multiple signals, each of the multiple signals being associated with a different portion of the band of radio frequencies. Each of the multiple signals is filtered to isolate each respective one of the multiple signals to its associated portion of the band of radio frequencies. At least one of the multiple signals is frequency translated. Each of the multiple signals are combined after the filtering of each of the multiple signals. The second signal is provided for wireless transmission by an antenna.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: December 30, 2014
    Assignee: Google Inc.
    Inventor: C. Philip Gossett
  • Patent number: 8908817
    Abstract: Example embodiments comprise a diversity receiver, and corresponding method, for measuring a differential phase between a first local oscillator of a first antenna and a second local oscillator of a second antenna in the presence of a primary interference signal and at least one secondary interference signal. The method may comprise receiving a primary communication signal, a primary reference signal and additional reference signals, and processing these signals such that a summation signal does not substantially comprise the at least one secondary interference signal. The estimation of differential phase is achieved by a phase shift calculation between processed signal components, using that a summation of all signal components equals, or is approximately equal to, a predetermined signal.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: December 9, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Mats Rydström, Dan Weinholt
  • Patent number: 8902831
    Abstract: Embodiments herein provide methods and systems for enhancing interference mitigation using conjugate symbol repetition and phase randomization on a set of subcarriers. The repeated data tone in the signal is complex-conjugated before transmission, when the repetition factor is two. When the repetition factor is greater than two, a combination of conjugate repetition and random/deterministic phase variation of the repeated tones is used to mitigate the interference mitigation. Embodiments further disclose Collision Free Interlaced Pilot PRU Structures that can be used with or without conjugate symbol repetition and phase randomization for interference mitigation.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: December 2, 2014
    Assignee: Centre of Excellence in Wireless Technology
    Inventors: Kiran Kumar Kuchi, Deviraj Klutto Milleth Jeniston, Vinod Ramaswamy, Baskaran Dhivagar, Krishnamurthi Giridhar, Bhaskar Ramamurthi, Padmanabhan Madampu Suryasarman, Dileep Manisseri Kalathil
  • Patent number: 8890730
    Abstract: An apparatus for calibration of a signal converter is disclosed. This apparatus includes a first digital-to-analog converter (“DAC”) and a calibration system coupled to an output port of the first DAC. The calibration system includes a second DAC. The calibration system is configured to provide an adjustment signal responsive to a spurious spectral performance parameter in an output of the first DAC. The spurious spectral performance parameter is sensitive to a timing error associated with the first DAC. The calibration system is coupled to provide the adjustment signal to the first DAC to correct the timing error of the first DAC.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 18, 2014
    Assignee: Xilinx, Inc.
    Inventors: Donnacha Lowney, Christophe Erdmann, Edward Cullen
  • Patent number: 8868018
    Abstract: A system for cancellation of a reciprocal-mixing noise may comprise a down-converter mixer that may be configured to down convert a radio-frequency (RF) signal and to generate a baseband signal. The RF signal may include a desired signal and a blocker signal. A first signal path may be configured to receive the baseband signal and to generate a first signal. A second signal path may be configured to receive the baseband signal and to generate a second signal. A subtraction module may be configured to subtract the second signal from the first signal and to generate an output signal. The second signal may comprise the reciprocal-mixing noise, and the output signal may comprise the desired signal substantially free from the reciprocal-mixing noise.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: October 21, 2014
    Assignee: Broadcom Corporation
    Inventors: Mohyee Mikhemar, David Murphy, Ahmad Mirzaei, Hooman Darabi
  • Patent number: 8843182
    Abstract: A communication device may select a communication path to check for pending messages in a multiple network environment. The communication device may exit from a power-saving operating mode during which the communication device does not receive messages from a message server. After exiting the power-saving operating mode, the communication device may identify multiple different communication paths. The multiple communication paths may include different communication networks in the multiple network environment. The communication device may determine a selected communication path from among the multiple communication paths and communicate with a message server across the selected communication path to check for messages.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: September 23, 2014
    Assignee: Broadcom Corporation
    Inventors: Jeyhan Karaoguz, Nambirajan Seshadri, James D. Bennett
  • Patent number: 8831548
    Abstract: A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be conventionally mixed and demodulated to extract useful signal information with enhanced receiver fidelity and sensitivity.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: September 9, 2014
    Assignee: American Radio LLC
    Inventor: Robert Hotto
  • Patent number: 8811928
    Abstract: The invention discloses a method (700) for finding differences in path loss between a plurality of RF paths between a first (120, 130) and a second (120, 130) transceiver in a wireless communications system (100). During defined 5 intervals of time (SACCH1-SACCH4), only one RF path is used to transmit from one of said transceivers to the other of said transceivers, and the receiving transceiver measures the strength of the signal received during at least a number of said intervals, thus making it possible to compare signal strength and thereby path loss between different RF paths, which in turn 10 makes it possible to find imperfections in one or more of said RF paths.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: August 19, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Benny Lennartson, Lars Boncz
  • Patent number: 8787852
    Abstract: The invention relates to a device comprising a direct path block with an input and an output, and a feedback block with an input and an output, the input of the direct path block being adapted to receive a multi-channel input signal with a given frequency range and the output of the direct path block being adapted to output an output signal with a base band frequency range, the output of the direct path block being coupled to the input of the feedback block and the input of the direct path block being coupled to the output of the feedback block. The direct path block comprises a first transposing unit (4) adapted to transpose the input signal to the base band frequency range and the feedback block comprises a filtering unit (3) adapted to filter the transposed signal at the output of the direct path block, a second transposing unit (5) adapted to transpose the filtered signal to the given frequency range and to feed back the transposed signal at the input of the direct path block.
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: July 22, 2014
    Assignee: ST-Ericsson SA
    Inventors: Philippe Cathelin, Christian Izquierdo, Franck Montaudon, Andreas Kaiser
  • Patent number: 8787853
    Abstract: A receiver circuit comprising first and second receivers for demodulating first and second parts, respectively, of a received signal. The receiver circuit also comprises an adjustment circuit for adjusting the demodulated signal from the first receiver. The output signal from the adjustment circuit is used as output signal from the receiver circuit which also comprises an adjustment value circuit for determining an adjustment value for the adjustment circuit in adjusting the output signal from the first receiver. The adjustment value circuit receives the demodulated signal from the second receiver and the output signal from the adjustment circuit and uses differences between these input signals for forming said adjustment value. The first receiver and the second receiver have different transfer functions within one and the same frequency range.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: July 22, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Derek Hagen, Vimar Bjork, Claes Rolen, Torbjorn Gunnar Widhe
  • Patent number: 8767895
    Abstract: A target link signal may be received at a receiving device with the target link signal being received in a received signal also including an interfering link signal. A quality of the interfering link signal in the received signal may be estimated at the receiving device to provide an estimated interfering link signal quality. One of a plurality of interference cancellation techniques may be selected responsive to the estimated interfering link signal quality, and an interference cancellation signal may be generated using the selected one of the plurality of interference cancellation techniques. Information of the interference cancellation signal may be incorporated in the received signal. Responsive to incorporating information of the interference cancellation signal in the received signal, the received signal may be demodulated to provide a demodulated target link signal, and the demodulated target link signal may be decoded to provide a target link bit stream.
    Type: Grant
    Filed: June 21, 2011
    Date of Patent: July 1, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Andres Reial
  • Patent number: 8750803
    Abstract: A method, apparatus, system, and computer program product example embodiments of the invention are disclosed to reduce interference of predictive signal transmissions between wireless devices. In an example embodiment, a wireless receiver is configured to receive a composite signal, wherein the composite signal includes at least a beacon component comprising a regular beacon symbol. The wireless receiver is configured to determine from the beacon component, a predicted reception of a predicted future beacon symbol, using a known beacon transmission pattern. The wireless receiver is configured to cancel from the composite signal a future received beacon symbol, based at least partly on the predicted future beacon symbol.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: June 10, 2014
    Assignee: Nokia Corporation
    Inventor: Markus Nentwig
  • Publication number: 20140141741
    Abstract: A method for reciprocal-mixing noise cancellation may include receiving, from a first mixer, a first signal comprising a wanted signal at a first frequency and a modulated signal at a second frequency. The modulated signal may be a product of a reciprocal-mixing of an unwanted signal with a phase noise. The second frequency may be greater than the first frequency, and at least a portion of the modulated signal may overlap the wanted signal, adding a reciprocal-mixing noise to the wanted signal. Using the first signal, a narrow second signal may be generated at a third frequency, twice the second frequency. At a second mixer, the second signal may be mixed with the first signal to generate a third signal. The third signal may be subtracted from the first signal to remove a reciprocal-mixing noise and to generate the wanted signal at the first frequency without the reciprocal-mixing noise.
    Type: Application
    Filed: November 21, 2012
    Publication date: May 22, 2014
    Applicant: BROADCOM CORPORATION
    Inventors: Mohyee MIKHEMAR, David Murphy, Hooman Darabi
  • Publication number: 20140141735
    Abstract: Systems and methods are provided for a broadband, closed-loop RF transmitter for multi-band applications that employs a single RF path to service multiple bands of operation. Embodiments of the present disclosure implement a broadband impedance matching module, which avoids the need for several costly and complex narrow-band matching networks. In an embodiment, the broadband impedance matching module includes concentric, mutually-coupled inductors. By adding this broadband impedance matching functionality, delay is significantly reduced because a single path can be used to service multiple bands.
    Type: Application
    Filed: January 27, 2014
    Publication date: May 22, 2014
    Applicant: Broadcom Corporation
    Inventors: Mohamed A. Mostafa, Derek Shaeffer
  • Patent number: 8724755
    Abstract: A receiving apparatus receives a digital modulation signal. The receiving apparatus has a receiving part for down-converting the digital modulation signal to a baseband signal and to obtain channel estimates, a channel estimation part for estimating a multi-path channel, a first replica generation part for generating a first replica, based on the channel estimates obtained by the channel estimation part, a first replica removal part for removing the first replica from a target frame in the baseband signal, a nulling part for forcefully nulling he baseband signal for at least a portion of the time period where an inter-frame interference occurs due to a delay wave having a delay time longer than the known signal, and a cyclic-addition part for performing cyclic-addition between a front side portion and a rear side portion in the target frame, including the portion nulled by the nulling part.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: May 13, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Toshiyuki Nakanishi, Daisuke Takeda, Tatsuhisa Furukawa
  • Patent number: 8718589
    Abstract: Method and apparatuses are disclosed to substantially compensate for various unwanted interferences and/or distortions within a communications receiver. Each of these apparatuses and methods estimate the various unwanted interferences and/or distortions within the communications receiver. Each of these apparatuses and methods remove the estimates of the various unwanted interferences and/or distortions within the communications receiver from one or more communications signals within the communications receiver to substantially compensate for the various unwanted interferences and/or distortions.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: May 6, 2014
    Assignee: Broadcom Corporation
    Inventors: Ramon Alejandro Gomez, Bruce J. Currivan, Massimo Brandolini, Young Shin, Francesco Gatta, Hanli Zou, Loke Kun Tan, Lin He, Thomas Joseph Kolze, Leonard Dauphinee, Robindra Joshi, Binning Chen
  • Publication number: 20140099908
    Abstract: Progressive cancellation of electromagnetic interference (EMI) is achieved by establishing a canceller stage processing order in a receiver feed circuit. Such a processing order may be one that progressively narrows an interference analysis bandwidth around desired target signal and optimizes gain-bandwidth characteristics of a cancellation loop in each canceller stage accordingly. A cancellation signal generated by each canceller stage is adaptively controlled without disturbing the stability of the cancellation loop. By doing so, the residual interference-to-noise ratio at each adaptive canceller stage is optimized independently from the closed cancellation loop control of the other canceller stages resulting in improved interference cancellation in the receiver feed circuit.
    Type: Application
    Filed: October 9, 2012
    Publication date: April 10, 2014
    Applicant: EXELIS INC.
    Inventor: Exelis Inc.
  • Patent number: 8693601
    Abstract: A system includes a polyphase multirate filter and a controller which, responsive to detecting a data stream: measures a current phase relationship between a current resampling filter input clock signal and a current multirate output clock signal; identifies, based on a mapping of the measured phase relationship within a pre-generated quantized mapping table, an initial polyphase filter coefficient index corresponding to the measured phase relationship; selects, based on the initial polyphase filter coefficient index identified, a corresponding polyphase filter component from within the multirate filter; configures the multirate filter to pass data from the data stream through the corresponding polyphase filter component to generate an initial output data sample; updates the initial polyphase filter coefficient index to a calculated next polyphase filter coefficient index value, in response to a request for generation of a next output data sample; and self-corrects the multirate filter responsive to a pre-ide
    Type: Grant
    Filed: January 3, 2012
    Date of Patent: April 8, 2014
    Assignee: Intel Corporation
    Inventors: Victor Adut, Gregory M. Agami, Yun H. Kim, Wei Chuan Ma
  • Patent number: 8676144
    Abstract: Interference in an unlicensed frequency band is spatially filtered out from received signals at a wireless device operating in the unlicensed frequency band. Energy received at a plurality of antennas of the wireless is device is analyzed to detect interference in the unlicensed frequency band. The detected interference is classified by type. Parameters for a nulling filter are generated or selected based on the type of interference detected in the received energy. During a time interval when it is expected to receive desired signals, the nulling filter is applied using the parameters to signals obtained from energy received at the plurality of antennas during the time interval.
    Type: Grant
    Filed: April 14, 2011
    Date of Patent: March 18, 2014
    Assignee: Cisco Technology, Inc.
    Inventors: Li Guo, Hang Jin, Paul J. Stager, Neil R. Diener, Matthew A. Silverman, Chandra Vaidyanathan
  • Patent number: 8666345
    Abstract: The invention relates to a filter (20) filtering a downlink signal of an antenna (13) of an indoor cellular system, the filter comprising a signal determining unit (24) determining a signal strength of an uplink signal received by said antenna (13), the filter adjusting a signal strength of the downlink signal of said antenna (13) in accordance with the signal strength of the uplink signal.
    Type: Grant
    Filed: April 9, 2009
    Date of Patent: March 4, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Said Soulhi, Taoufiq Abouzid
  • Patent number: 8654831
    Abstract: A signal detection apparatus detects the frequency of an input signal without using a PLL. The detection apparatus includes a first and a second orthogonalizer, a phase difference calculator and an integrator, to control the variable coefficient a1 of a band-pass filter. Information e[k]=M·sin(?) representing the phase difference ? between the input data x[k] and the output data y[k] is calculated with the first and second orthogonalizers and the phase difference calculator. The sign of e[k] is inverted and a predetermined integral calculation is performed with the integrator, and the calculated integral value is set as the coefficient a1 of the band-pass filter. Every time input data x[k] is input, the coefficient a1 is changed by reducing it when e[k]>0 and increasing it when e[k]<0. Thus, the frequency of the output signal of the band-pass filter is matched to the input signal.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: February 18, 2014
    Assignee: Daihen Corporation
    Inventor: Toyokazu Kitano
  • Patent number: 8611480
    Abstract: Systems and methods are provided for decoding a signal vector in a transmit diversity scheme for varying channels. Information obtained in more than one symbol period are treated as a single received vector, and each of the received signal vectors may be processed to reduce the effects of varying channel characteristics. The received signal vectors may be combined by addition and decoded using a maximum-likelihood decoder. In some embodiments, the received signal vectors are processed separately and then combined. In other embodiments, the received signal vectors are combined and then processed. In some embodiments, zero-forced linear equalization techniques are used to processed the received signals. In some embodiments the signal vectors and varying channel response matrices are broken down to equivalent forms in order to simplify the processing.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: December 17, 2013
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Rohit U. Nabar, Hui-Ling Lou
  • Patent number: 8611843
    Abstract: A filter package for communications equipment includes two or more filters in die form, each having a different frequency response. A first switch and a second switch are operatively connected to the filters and are configured to select a desired filter for operation in a signal stage of the equipment. The filters are aligned and stacked one over the other in the form of a package having an input terminal that is tied to a common terminal of the first switch, and an output terminal tied to a common terminal of the second switch. When the input and the output terminals of the filter package are connected to corresponding terminals of an intermediate frequency (IF) stage in a communications transceiver, the package can support both narrowband and wideband waveforms defined by the Joint Tactical Radio System (JTRS).
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: December 17, 2013
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: Michael S. Vogas
  • 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: 8587729
    Abstract: The present invention relates to a receiver capable of reducing influence of disturbance waves and capable of receiving analog and digital broadcast signals without interference with a single front end module, without leading to complexity of the configuration. A receiver 10 includes, on a module board 11, a first terrestrial wave tuner 16 and second terrestrial wave tuner 17 which receive broadcast signals of a first frequency band, and a first satellite wave tuner 14 which receives broadcast signals of a second frequency band different from the first frequency band, with the first satellite wave tuner 14 being situated between the first terrestrial wave tuner 16 and the second terrestrial wave tuner 17. The present invention can be applied to receivers receiving broadcast signals of different frequency bands, for example.
    Type: Grant
    Filed: July 9, 2010
    Date of Patent: November 19, 2013
    Assignee: Sony Corporation
    Inventors: Toshikazu Yoshida, Hideaki Ozawa, Mitsuru Ikeda, Hidetoshi Kurihara, Koji Yoshida, Masaru Shimanuki, Tadashi Imai
  • Publication number: 20130303103
    Abstract: An adaptive cancellation circuit and method are provided. The circuit includes a main path and an auxiliary path. The main path includes a first amplifier configured to output a first amplified signal to a first mixer. The main path is configured to output a first signal comprising a wanted signal component and a distortion component. The auxiliary path includes a second amplifier configured to output a second amplified signal to a second mixer. The second mixer is connected to a filter configured to remove the wanted signal component. The auxiliary path is configured to output a second signal including the distortion component.
    Type: Application
    Filed: May 11, 2012
    Publication date: November 14, 2013
    Applicant: BROADCOM CORPORATION
    Inventors: Mohyee Mikhemar, Hooman Darabi
  • Patent number: 8571591
    Abstract: Systems and techniques relating to wireless communications are described. A described technique includes monitoring a group of wireless channels that are useable by at least a first wireless communication device for wireless communications, receiving one or more beacon signals from one or more second wireless communication devices, identifying, within the group of wireless channels, one or more primary channels on which the one or more beacon signals are received, estimating a traffic load for the one or more identified primary channels, determining, based on the estimated traffic load, whether to use as a primary channel for the first wireless communication device, a channel of the one or more identified primary channels or a channel of the group of wireless channels that is separate from the one or more identified primary channels; and selecting the primary channel for the first wireless communication device based on a result of the determining.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: October 29, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Yong Liu, Harish Ramamurthy
  • Patent number: 8552790
    Abstract: A signal converting device includes: a reference signal-mixing circuit arranged to generate a reference mixing output signal according to an input signal, a reference gain, and a reference local oscillating signal; a plurality of auxiliary signal-mixing circuits, each arranged to generate an auxiliary mixing output signal according to the input signal, an auxiliary gain, and an auxiliary local oscillating signal; and a combining circuit arranged to combine the reference mixing output signal and a plurality of the auxiliary mixing output signals to generate an output signal, and at least one of the auxiliary signal-mixing circuits is configured by the corresponding auxiliary gain to compensate phase imbalances between the reference mixing output signal and each of the auxiliary mixing output signals to reduce a power of a harmonic component in the output signal.
    Type: Grant
    Filed: May 8, 2011
    Date of Patent: October 8, 2013
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Huajiang Zhang, Chun Giek Tan
  • Patent number: 8521118
    Abstract: A circuit arrangement is disclosed with a radio-frequency mixer in which a plurality of preamplifiers in a receiver have a common output node. This node is connected to a common, broadband radio-frequency mixer via common coupling capacitances. Switching means can be used to connect and disconnect the preamplifiers, which can be associated with various frequency bands, independently of one another. The present principle can be applied in multiband receivers in mobile radio and allows integration using little chip area with good radio-frequency characteristics.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: August 27, 2013
    Assignee: Intel Mobile Communications GmbH
    Inventor: Axel Schmidt
  • 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: 8498346
    Abstract: Multicarrier receivers and methods for carrier frequency offset correction and channel estimation for receipt of simultaneous transmissions over a multi-user uplink are generally described herein. Other embodiments may be described and claimed.
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: July 30, 2013
    Assignee: Intel Corporation
    Inventors: Ashim Biswas, Lakshmipathi Sondur, Anees A. Sahib, Sean Lawrence
  • Patent number: 8483260
    Abstract: A method and apparatus for reducing the computational load associated with computing weighting factors for wireless signals received at a wireless receiver is disclosed herein. The method and apparatus reuses a covariance factor matrix to compute multiple sets of weighting factors for multiple received signals. Particular embodiments factor a covariance matrix determined for a first received signal to determine a covariance factor matrix, and use the covariance factor matrix to determine a set of weighting factors for the first received signal as well as to determine additional sets of weighting factors for one or more additional received signals. The different received signals may be associated with different times, different channelization codes, and/or different frequencies. The weighting factors may be used to weight and combine received signals in a GRAKE receiver or chip equalizer. The weighting factors may also be used to determine a signal quality metric.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: July 9, 2013
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Anders Rosenqvist
  • Patent number: 8472566
    Abstract: An apparatus and method for reducing pilot overhead in a multi-antenna system are provided. The method generates postcodes and pre-codes for streams used to transmit signals to at least two receivers. The method allocates a pilot signal to at least one of the streams, and allocates an additional pilot signal shared by at least one of the streams. The method precodes the pilot signal allocated to at least one of the streams, the additional pilot signal, and data to be transmitted to each of the receivers, based on the pre-code for each of the streams, prior to transmission.
    Type: Grant
    Filed: April 16, 2009
    Date of Patent: June 25, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Eun-Seok Ko, Eun-Yong Kim, Yung-Soo Kim
  • Patent number: 8457264
    Abstract: A radio receiver includes a first diversity antenna structure, a second diversity antenna structure, a first RF receiver section, a second RF receiver section, a combining module, and a baseband processing module. The first diversity antenna structure provides the received inbound RF signals from one of the plurality of first antennas based on a first antenna selection signal to produce first received inbound RF signals. The second diversity antenna structure provides the received inbound RF signals from one of the plurality of second antennas based on a second antenna selection signal to produce second received inbound RF signals. The first and second RF receiver sections are operably coupled to convert the first and second received inbound RF signals into first and second inbound baseband signals, respectively. The combining module combines the first and second inbound baseband signals to produce inbound baseband signals.
    Type: Grant
    Filed: September 17, 2004
    Date of Patent: June 4, 2013
    Assignee: VIXS Systems, Inc.
    Inventors: James Ward Girardeau, Jr., Paul Morris Astrachan, Mathew A. Rybicki, Bojan Subasic
  • Patent number: 8452251
    Abstract: A preselector amplifier system and method including of various components is described. The various components may include a vector generator, an active power splitter, an active power combiner, or the like. The preselector amplifier may be integral to and/or coupled to a communications system. The communications system may be at least one of a transceiver, receiver and/or transmitter. The communications system may transmit radio frequency (RF) signals.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: May 28, 2013
    Assignee: ViaSat, Inc.
    Inventor: David R. Saunders
  • Patent number: 8428541
    Abstract: A method for choosing at least one signal path is disclosed and may include determining a power level characteristic for each of a plurality of signal paths. The determined power level characteristic for each of the plurality of signal paths may be modified. At least one of the plurality of signal paths may be selected for receiving a signal. The selecting may be based on at least one of the modified power level characteristics. The method may also include cycling through at least one of the signal paths. The power level characteristic for each of the plurality of signal paths may be biased. The power level characteristic for each of the plurality of signal paths may be increased by a fixed amount.
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: April 23, 2013
    Assignee: Broadcom Corporation
    Inventors: Rajendra Tushar Moorti, Min Chuin Hoo, Jason Alexander Trachewsky