Noise Or Interference Elimination Patents (Class 455/114.2)
  • Patent number: 9026162
    Abstract: Apparatus configured to be implemented in a first wireless communication device, having corresponding non-transitory computer-readable media, comprise a memory configured to store a coexistence schedule, wherein the coexistence schedule defines WLAN intervals and non-WLAN intervals; a WLAN transceiver configured to transmit WLAN signals in an IBSS network; a non-WLAN transceiver configured to transmit wireless non-WLAN signals; and a coexistence circuit configured to allow the WLAN transceiver to transmit the WLAN signals in the IBSS network only during the WLAN intervals, wherein the coexistence circuit is further configured to allow the non-WLAN transceiver to transmit the wireless non-WLAN signals only during the non-WLAN intervals; and wherein the coexistence circuit is further configured to cause the WLAN transceiver to transmit one or more coexistence request messages, each indicating a duration of at least one of a respective one of the WLAN intervals, and a respective one of the non-WLAN intervals.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: May 5, 2015
    Assignee: Marvell World Trade Ltd.
    Inventors: Sarang Shrikrishna Wagholikar, Harish Ramamurthy, Rajesh Shreeram Bhagwat, Matthew L. Semersky
  • Patent number: 9025686
    Abstract: The present invention relates to clipping thresholds adjustment for Crest Factor Reduction CFR in a radio unit, wherein the radio unit comprises one or more clipping stages that apply respective clipping thresholds to clip input signals, comprising: determining a target threshold for the clipping stages based on a target PAR and the amplitudes or powers of the input signals, estimating the direction in which original PAR of the input signals changes by comparing amplitudes of the clipped signals from the clipping stages with the target threshold, and adjusting the clipping thresholds based on the estimated direction. The present invention also relates to dynamic stage control. With the present invention, clipping thresholds and clipping stages are adaptively changes with dynamic original PAR of input signals and the efficiency of power amplifier is increased with a low implementation cost.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: May 5, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventor: Tao Gu
  • Publication number: 20150118980
    Abstract: Certain aspects of the present disclosure provide methods and apparatus for calibrating a transceiver for wireless communications. One example method generally includes configuring a first oscillating signal as an input signal to at least a portion of a receiver (RX) path, calibrating a residual sideband (RSB) of the receiver path using a second oscillating signal as a local oscillating signal for the receiver path, and calibrating an RSB of a transmitter (TX) path by routing an output of the transmitter path to the receiver path, after calibrating the RSB of the receiver path. Another example method generally includes routing an output of a transmitter path to a receiver path, using a first local oscillating signal for the transmitter path, using a second local oscillating signal for the receiver path, and measuring an output of the receiver path as a local oscillator (LO) leakage for the transmitter path.
    Type: Application
    Filed: April 29, 2014
    Publication date: April 30, 2015
    Applicant: QUALCOMM INCORPORATED
    Inventors: Lai Kan LEUNG, Chiewcharn NARATHONG, Jianyun HU
  • Patent number: 9020066
    Abstract: Single-bit transmitter modulator having a digital pulse shaping filter configured to shape data pulses of an inphase signal and quadrature signal; an upsampling filter configured to increase the sample rate of the inphase signal and quadrature signal; a sigma-delta modulator providing a one-bit inphase output signal and a one-bit quadrature output signal; an inphase low-order analog low pass filter coupling the one-bit inphase output signal to an inphase channel input of a quadrature modulator, and a quadrature low-order analog low pass filter coupling the one-bit quadrature output signal to a quadrature channel input of a quadrature modulator; and, wherein the quadrature modulator is connected to a carrier signal generator and is configured to generate an inphase and quadrature modulated carrier.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 28, 2015
    Assignee: Innophase Inc.
    Inventors: Yang Xu, Xuejun Zhang
  • Patent number: 9020067
    Abstract: Distortion and aliasing reduction for digital to analog conversion. Synthesis of one or more distortion terms made based on a digital signal (e.g., one or more digital codewords) is performed in accordance with digital to analog conversion. The one or more distortion terms may correspond to aliased higher-order harmonics, distortion, nonlinearities, clipping, etc. Such distortion terms may be known a priori, such as based upon particular characteristics of a given device, operational history, etc. Alternatively, such distortion terms may be determined based upon operation of a device and/or based upon an analog signal generated from the analog to conversion process. For example, frequency selective measurements made based on an analog signal generated from the digital to analog conversion may be used for determination of and/or adaptation of the one or more distortion terms. One or more DACs may be employed within various architectures operative to perform digital to analog conversion.
    Type: Grant
    Filed: April 1, 2013
    Date of Patent: April 28, 2015
    Assignee: Broadcom Corporation
    Inventors: Thomas J. Kolze, Bruce J. Currivan, Ramon A. Gomez
  • Publication number: 20150111510
    Abstract: A method and apparatus for cancelling, from signals received by a radio device in a first frequency band, interference generated by the radio device in the first frequency band when the radio device transmits simultaneously radio signals on at least a second frequency band.
    Type: Application
    Filed: October 22, 2013
    Publication date: April 23, 2015
    Applicant: Broadcom Corporation
    Inventors: Pierre BAUDIN, Mikael GUENAIS
  • Patent number: 9014637
    Abstract: Examples are disclosed for switching frequency control of an on-chip or integrated voltage regulator. In some examples, a switch frequency of an integrated voltage regulator may be monitored. A determination of whether the monitored switch frequency causes radio signal interference may cause the switch frequency to be adjusted to eliminate or reduce the radio signal interference. Other examples are described and claimed.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: April 21, 2015
    Assignee: Intel Corporation
    Inventors: Harry G. Skinner, Dawson W. Kesling, Jeremy Shrall
  • Patent number: 9014298
    Abstract: Transmission quality is improved in an environment in which direct waves dominate in a transmission method for transmitting a plurality of modulated signals from a plurality of antennas at the same time. All data symbols used in data transmission of a modulated signal are precoded by hopping between precoding matrices so that the precoding matrix used to precode each data symbol and the precoding matrices used to precode data symbols that are adjacent to the data symbol in the frequency domain and the time domain all differ. A modulated signal with such data symbols arranged therein is transmitted.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: April 21, 2015
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 9007131
    Abstract: A frequency-control circuit includes a phase frequency detector configured to receive a reference frequency signal and generate an output detection signal. The phase frequency detector can be configured to detect a difference in phase and frequency between the reference frequency signal and a feedback of the output frequency signal. The frequency-control circuit also includes a frequency divider that is configured to apply a correction voltage to a feedback of the output frequency signal, the correction voltage being a function of a pulling signal having one or more unwanted frequency components. The frequency-control circuit also includes a loop filter configured to filter the output detection signal including the correction voltage and generate a control voltage signal. The frequency-control circuit also includes a voltage-controlled oscillator configured to receive the control voltage signal and generate an output frequency signal.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: April 14, 2015
    Assignee: Broadcom Corporation
    Inventors: Ahmad Mirzaei, Hooman Darabi
  • Patent number: 9008694
    Abstract: An apparatus and method is provided for indoor/outdoor transition detection of devices to improve selection of the navigation algorithms. A mobile device can scan resources such as radio frequency (RF) sources in its vicinity and compare the scanned resources with a set of indoor-only resources to determine whether the mobile device is located inside a structure (e.g., indoor) or outside the structure (e.g., outdoor). The techniques provide an apparatus and method to determine when a device transitions between indoor and outdoor to efficiently use appropriate algorithm for positioning and/or navigation.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: April 14, 2015
    Assignee: Broadcom Corporation
    Inventors: Richard Fuller, Steven Malkos
  • Patent number: 9001680
    Abstract: A method, apparatus and computer program product provide improved detection of overlapping wireless networks. In this regard, the method, apparatus and computer program product may utilize a processor, such as a processor on a wireless access point, to determine one or more parameters for a scan of a wireless network to identify overlapping networks. Wireless stations may utilize the parameters to determine the content of a scan report generated from a scan of the wireless network. The wireless stations may further utilize the parameters to determine which values should be monitored and/or recorded during the scan of the network. The wireless stations may respond to the access point with results corresponding to the parameters requested by the access point, and the access point may use the results to determine channel access parameters for other devices on the network, such as the wireless stations.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: April 7, 2015
    Assignee: Broadcom Corporation
    Inventors: Timo K. Koskela, Anna Pantelidou, Samuli Turtinen, Sami-Jukka Hakola
  • Patent number: 9002301
    Abstract: Embodiments of the present disclosure provide system and method for generating a transmission signal. A transmitter generates and transmits a transmission signal based on signal components. Circuitry that is coupled to the transmitter receives complex plane components of a signal to be transmitted and alters the signal such that a complex plane trajectory of the signal passes nearer to an origin of a complex plane of the complex plane trajectory than does an original complex plane trajectory of the signal. The circuitry determines the signal components to be transmitted by the transmitter based on the altered signal.
    Type: Grant
    Filed: December 3, 2012
    Date of Patent: April 7, 2015
    Assignee: Marvell International Ltd.
    Inventors: Luca Vercesi, Fernando De Bernardinis
  • Patent number: 8995565
    Abstract: This invention includes a waveform analyzing means (13) for calculating an estimated value of a back-off value required by a power amplifier (2), which amplifies a high-frequency signal generated from a baseband signal (I, Q) to a predetermined transmission power, by analyzing the waveform of the baseband signal (I, Q), and a control means (14) for controlling at least one of the amplitude of high-frequency power input to the power amplifier (2) and the supply power of the power amplifier (2) on the basis of the estimated value. The invention calculates the estimated value of a back-off value by analyzing the waveform of a baseband in this manner, and hence need not generate a table in advance by calculating a back-off value for each combination of code channels. The invention can therefore be applied to even a case in which the number of code channels greatly increases, and can effectively prevent an increase in adjacent channel leakage power due to a signal obtained by multiplexing these code channels.
    Type: Grant
    Filed: May 17, 2007
    Date of Patent: March 31, 2015
    Assignee: Lenovo Innovations Limited (Hong Kong)
    Inventor: Masaki Ichihara
  • Patent number: 8989755
    Abstract: A method for communication in a wireless telecommunication network is provided. The method comprises transmitting, by a first cell, to a first UE, a first signal on a resource block configured to be shared by more than one cell; and transmitting, by a second cell, to a second UE, a second signal on the same resource block, wherein a specification of a location of the resource block is included in configuration information available to the first cell and the second cell.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: March 24, 2015
    Assignee: BlackBerry Limited
    Inventors: Siva Dharshan Muruganathan, Yongkang Jia, Yi Song, Hua Xu, Vahid Pourahmadi, Robert Mark Harrison, Shiwei Gao
  • Patent number: 8989253
    Abstract: A technique for a reconditioning equalizer filter for non-constant envelope signals is described. The input to a transmitter chain is modified by a reconditioning equalizer filter, prior to being applied to the transmitter. The reconditioning equalizer filter modifies and smoothens the amplitude of the signal. The modified and smoothened signal has its peaks reduced which results in lower Crest Factor. The input to the reconditioning equalizer filter could be a baseband, intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal, it needs to be down-converted to baseband before being applied to the reconditioning equalizer filter. The reconditioning equalizer filter could be performed in a digital or analog domain.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: March 24, 2015
    Assignee: Altera Corporation
    Inventor: Kiomars Anvari
  • Patent number: 8989305
    Abstract: Disclosed herein are a method and apparatus for generating multiband Radio Frequency (RF) signals in maritime wireless communication. The apparatus includes a baseband conversion unit, a phase compensation unit, a Direct Current (DC) offset compensation unit, and an RF transmission unit. The baseband conversion unit converts RF signals corresponding to a baseband modulation signal having a negative frequency and a baseband modulation signal having a positive frequency into baseband signals, respectively. The phase compensation unit eliminates the images of multiband signals so as to correspond to the baseband signals. The DC offset compensation unit compensates the baseband modulation signals for DC offsets using the multiband signals from which the images have been eliminated. The RF transmission unit generates the RF signals using the signals which have been compensated for the DC offsets, and sends the RF signals via an antenna.
    Type: Grant
    Filed: February 25, 2013
    Date of Patent: March 24, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jin-Kyu Choi, Jong-Min Park, Dae-Seung Yoo, Gwang-Ja Jin, Byung-Tae Jang, Dong-Sun Lim
  • Patent number: 8989680
    Abstract: According to one aspect, a method is provided for determining a state of a receiver on a transmission line. The method may comprise, for example, evaluating a first voltage arising at a circuit point between an impedance and a transmission line coupled to the impedance, wherein the impedance is coupled between a transmitter and the receiver, and determining a state of the receiver based on the first voltage. According to further aspects, various apparatuses are provided for performing this and other methods.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: March 24, 2015
    Assignee: Infineon Technologies AG
    Inventor: Andreas Hebenstreit
  • Patent number: 8983407
    Abstract: Radio frequency (RF) power amplifier (PA) circuitry, which transmits RF signals is disclosed. The RF PA circuitry includes a final stage, a final stage current digital-to-analog converter (IDAC), and a final stage temperature compensation circuit. A final stage current reference circuit may provide an uncompensated final stage reference current to the final stage temperature compensation circuit, which receives and temperature compensates the uncompensated final stage reference current to provide a final stage reference current. The final stage IDAC uses the final stage reference current in a digital-to-analog conversion to provide a final stage bias signal to bias the final stage. The temperature compensation provided by the final stage temperature compensation circuit is selectable.
    Type: Grant
    Filed: November 3, 2011
    Date of Patent: March 17, 2015
    Assignee: RF Micro Devices, Inc.
    Inventors: William David Southcombe, David E. Jones, Hui Liu, Chris Levesque, Scott Yoder, Terry J. Stockert
  • 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: 8977311
    Abstract: The present invention relates to a method and arrangement for reducing interference in a cellular communication network. A radio base station of the network is configured to serve at least a first cell, where interference is reduced by selecting a link adaptation scheme for a UE in the first cell, The arrangement comprises means for receiving measurements on estimated channel quality, means for estimating channel quality for a future transmission by adjusting the received measurements on estimated channel quality based on knowledge of future UE scheduling in at least the first cell, and means for selecting the link adaptation scheme comprising a transmit power level based on the estimated channel quality for the future transmission.
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: March 10, 2015
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jacob Osterling, Franz Heiser, Gunnar Peters
  • Publication number: 20150065071
    Abstract: A mixing stage includes a first modulation stage that receives an input signal from a first common node of the mixing stage, a first local oscillator input that receives a local oscillator signal, and a first modulation signal output adapted to provide a first modulated signal. A second modulation stage of the mixing stage includes a second input that receives a phase inverted representation of the input signal from a second common node of the mixing stage, a second local oscillator input that receives the local oscillator signal, and a second modulation signal output adapted to provide a second modulated signal. A current generation circuit provides a supply current to the first common node and to the second common node. A current control circuit is adapted to superimpose an offset current to the current of at least one node of the first common node and the second common node.
    Type: Application
    Filed: September 5, 2013
    Publication date: March 5, 2015
    Inventors: Saverio Trotta, Herbert Knapp
  • Patent number: 8971828
    Abstract: The embodiments of the present invention provide a predistortion device, method for predistortion and transmitter/receiver system. The predistortion device comprises a predistortion unit, and the predistortion device further comprises: a signal acquiring unit to process the output signals of a transmitting circuit to obtain distorted signals; a signal coupling unit to couple the distorted signals acquired by the signal acquiring unit to the receiving signals inputted to a receiving circuit; and a signal processing unit to decouple the output signals of the receiving circuit to acquire the distorted signals and the receiving signals. With the embodiments of the present invention, an analog receiving circuit may be reused in a half duplexing system and a full duplexing system, and the requirement on the analog receiving circuit is lowered, thereby reducing the cost.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: March 3, 2015
    Assignee: Fujitsu Limited
    Inventors: Jianmin Zhou, Pei Chen, Hui Li, Zhan Shi
  • Patent number: 8965308
    Abstract: A mobile wireless communications device includes a housing, antenna, and circuit board carried by the housing and having radio frequency (RF) circuitry operative with the antenna for receiving and transmitting RF signals through the antenna. A power amplifier is connected within a transmission line for amplifying RF signals to be transmitted over the transmission line to the antenna. An antenna switch is connected to the antenna and RF circuitry. An RF shield surrounds the power amplifier and antenna switch and isolates the power amplifier and antenna switch from the antenna and RF circuitry. A low pass filter is connected to the power amplifier and antenna switch for reducing any RF coupling of voltage standing waves of upper harmonic frequencies from the power amplifier into the antenna switch through the RF shield while maintaining transmission of signals through the transmission line at a desired fundamental frequency.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: February 24, 2015
    Assignee: BlackBerry Limited
    Inventors: Lizhong Zhu, George Soliman Mankaruse, Michael Stephen Corrigan
  • Patent number: 8965454
    Abstract: In one embodiment, an amplifier system has a tap, a delay filter, a linearized amplifier, and a hybrid combiner. The tapped portion of an input signal is amplified by the amplifier, the untapped portion of the input signal is delayed by the delay filter, and the combiner combines the resulting amplified, tapped portion and the delayed, untapped portion to generate an amplified output signal. By re-combining the delayed, untapped portion of the input signal with the amplified, tapped portion, the power of the untapped portion is not lost, and the amplifier does not have to compensate for all of the distortion that would otherwise be associated with the total output power level. Such an amplifier system is applicable, for example, in upgrading an existing GSM cell site to support both GSM communications as well as UMTS communications without degrading GSM operations.
    Type: Grant
    Filed: March 4, 2009
    Date of Patent: February 24, 2015
    Assignee: Andrew LLC
    Inventors: George P. Vella-Coleiro, Josef Ocenasek, Jeffrey G. Strahler, Christopher F. Zappala
  • Patent number: 8965307
    Abstract: Systems and methods are disclosed relating to transmission of communications via high frequency antenna systems employing high-temperature superconductor filters and/or amplifiers. In certain embodiments, a comb linear amplifier combiner may be modified with, for example, cryogenically cooled and/or high-temperature superconductor components, such as matching units of bandpass filters. A computer control unit may be coupled to the transmission circuit to control operation of one or more of the low-power transmitters, filters, and/or amplifiers.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: February 24, 2015
    Assignee: Liberty University
    Inventors: Michael Anthony Maiuzzo, Ronald T. Sones
  • Patent number: 8958456
    Abstract: A composite wireless device including a WLAN device and a BT device. The composite wireless device includes a wireless-channel control unit that determines usable FH channels that can be used for frequency hopping of the BT device, based on communication quality information of the WLAN channel, and notifies the BT device of the usable frequency bands, and a BT-communication control unit that acquires communication quality information of an extended frequency band, which is a frequency band other than the usable frequency bands, as extended communication quality information. The wireless-channel control unit adds the FH channels in the WLAN channel, which are determined as being unused based on the extended communication quality information, as the usable FH channels.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: February 17, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventor: Yukimasa Nagai
  • Patent number: 8958806
    Abstract: Certain embodiments provide a Femtocell base station arranged to receive interference notifications from another Femtocell base station and to send an interference remedial command to the other Femtocell base station and/or to one or more further Femtocell base stations.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: February 17, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Parag Gopal Kulkarni
  • Publication number: 20150044979
    Abstract: A mixer for a transmitter includes a voltage converter to convert a baseband voltage to a baseband current. A mixer component mixes the baseband current with a local oscillator frequency. An output of the mixer component includes a radio frequency signal and a higher order radio frequency signal. A coupler sends the radio frequency signal and the higher order radio frequency signal to a differential output. A filter is integrated into the coupler to filter the higher order radio frequency signal before being output by the differential output.
    Type: Application
    Filed: August 28, 2013
    Publication date: February 12, 2015
    Applicant: Broadcom Corporation
    Inventors: Utku Seckin, Ali Afsahi, Ali Sarfaraz
  • Patent number: 8954017
    Abstract: A communications device is disclosed that implements a phase-locked-loop to multiply a clock signal provided to a power management unit (PMU) by a variable integer value. Multiplying the PMU clock signal provides a second clock signal where the second clock signal is characterized by a fundamental component with one or more harmonics of the fundamental component that differ from the fundamental component and the one or more harmonics of the PMU clock signal. The fundamental component with one or more harmonics of the second clock signal does not occupy the same communication channel as the transmission communication signal of the communications device. Thus, minimizing the degradation of the transmission communication signal.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: February 10, 2015
    Assignee: Broadcom Corporation
    Inventors: Love Kothari, Ajat Hukkoo, Kerry Alan Thompson
  • Patent number: 8948712
    Abstract: Aspects of the present disclosure relate to determining the location and/or density of vias that form part of an RF isolation structure of a packaged module and the resulting RF isolation structures. From electromagnetic interference (EMI) data, locations of where via density can be increased and/or decreased without significantly degrading the EMI performance of the RF isolation structure can be identified. In certain embodiments, one or more vias can be added and/or removed from a selected area of the packaged module based on the EMI data.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: February 3, 2015
    Assignee: Skyworks Solutions, Inc.
    Inventors: Howard E. Chen, Matthew Sean Read, Hoang Mong Nguyen, Anthony James LoBianco, Guohao Zhang, Dinhphuoc Vu Hoang
  • Patent number: 8942382
    Abstract: Near-end equipment for a communication channel with far-end equipment. The near-end equipment includes at least one loudspeaker, at least two microphones, a beamformer, and an echo canceller. The communication channel may be in one of a number of communication states including Near-End Only state, Far-End Only state, and Double-Talk state. In one embodiment, when the echo canceller determines that the communication channel is in either the Far-End Only state or the Double-Talk state, the beamformer is configured to generate a nearfield beampattern signal that directs a null towards a loudspeaker. When the echo canceller detects the Near-End Only state, the beamformer is configured to generate a farfield beampattern signal that optimizes reception of acoustic signals from the near-end audio source. Using different beamformer processing for different communication states allows echo cancellation processing to be more successful at reducing echo in the signal transmitted to the far-end equipment.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: January 27, 2015
    Assignee: MH Acoustics LLC
    Inventors: Gary W. Elko, Tomas F. Gaensler, Eric J. Diethorn, Jens M. Meyer
  • Patent number: 8937992
    Abstract: A method and apparatus for updating equalization coefficients of an adaptive pre-equalizer of a network element are provided. The method includes monitoring a communications channel to measure distortion of a communications signal received from the network element and detecting whether a transient impairment is present in the communication signal. When a transient impairment is not detected to be present, a pre-equalization coefficient update is transmitted to the network element. However, when a transient impairment is detected to be present, at least selected ones of the pre-equalization coefficients are scaled before the update is transmitted to the network element or the update is withheld from being transmitted to the network element. An apparatus is also disclosed.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: January 20, 2015
    Assignee: General Instrument Corporation
    Inventors: Michael J. Cooper, Charles S. Moore, John L. Moran, Marc L. Morrissette, Robert J. Thompson
  • Publication number: 20150017932
    Abstract: A signal amplification apparatus includes a first modulator configured to receive an envelope signal, use a predetermined reference level to separate the received envelope signal into a first period and a second period, digitally modulate a signal of the second period to output the digitally modulated signal to a first output terminal, and output a signal of the first period to a second output terminal. Further, the signal amplification apparatus includes a second modulator configured to mix the digital modulated signal input through the first output terminal with a phase modulated carrier signal; an envelope modulator configured to output the signal of the first period as a power supply signal; and a power amplifier configured to amplify the mixed signal output by the second modulator to output the amplified signal.
    Type: Application
    Filed: January 8, 2014
    Publication date: January 15, 2015
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Seunghyun JANG, Sung Jun LEE, Young Kyun CHO, Bong Hyuk PARK, JAE HO JUNG, Kwangchun LEE
  • Patent number: 8934860
    Abstract: A method for detecting an ingress of a short wave radio signal in a power line communication system which determines a strength of a common mode signal at a frequency of the power line communication system during a time period when no communication in the power line communication system at this frequency takes place and an ingress is detected if the strength of the common mode signal is above a determined threshold. A corresponding power line communication modem can implement such a method.
    Type: Grant
    Filed: May 8, 2009
    Date of Patent: January 13, 2015
    Assignee: Sony Corporation
    Inventor: Andreas Schwager
  • Patent number: 8934896
    Abstract: In one embodiment, a wireless base station, receives a random access preamble from a wireless device that is not authorized to utilize the wireless base station; completes a random access procedure with the wireless device; receives an interference stress message from the wireless device, the interference stress message indicating that the wireless device suffers interference from the wireless base station; and reduces interference for the wireless device.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: January 13, 2015
    Assignee: Fujitsu Limited
    Inventor: Chenxi Zhu
  • Patent number: 8929843
    Abstract: An antenna power coupler having a variable coupling factor is disclosed. In an exemplary embodiment, an apparatus includes a coupler configured to generate a power detection signal based on transmit signal power associated with a plurality of transmission technologies and a variable attenuator configured to apply a selected attenuation factor to the power detection signal to generate an adjusted power detection signal, the selected attenuation factor associated with a selected transmission technology.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: January 6, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Prashanth Akula, David Maldonado, Kevin Hsi Huai Wang
  • Patent number: 8923786
    Abstract: Various methods of mitigating RF interference with one or more critical care medical devices is provided, wherein a predetermined threshold energy acceleration value is associated with the one or more critical care medical devices that, if exceeded, will cause RF interference with the one or more critical care medical devices. The methods includes generating and transmitting RF energy, wherein at least a portion of said RF energy follows an RF power profile of power versus time having a particular format designed to mitigate interference.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: December 30, 2014
    Assignee: University of Pittsburgh—of the Commonwealth System of Higher Education
    Inventors: Marlin H. Mickle, Ajay Ogirala, Peter J. Hawrylak, Joshua R. Stachel
  • Patent number: 8923434
    Abstract: A method and an apparatus for modifying a complex-valued signal are described, the complex-valued signal representing a first symbol and a second symbol. A signal trajectory of the complex-valued signal between the first and second symbols is determined, and, if the signal trajectory passes nearby the constellation origin, the signal trajectory is altered to run closer to the constellation origin.
    Type: Grant
    Filed: February 11, 2013
    Date of Patent: December 30, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Andreas Menkhoff, Staffan Sahlin
  • Patent number: 8923862
    Abstract: A method for avoiding mutual interference when heterogeneous communication modules such as LTE, wireless LAN, Bluetooth, and GPS coexist in a terminal in a wireless communication system is provided. The terminal may reduce mutual interference when a plurality of communication modules simultaneously operate to efficiently communicate therewith.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: December 30, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae Hyuk Jang, Soeng Hun Kim, Gert-Jan Van Lieshout
  • Patent number: 8923455
    Abstract: A method includes, in a mobile communication terminal, receiving from at least first and second base stations, which cooperate in a coordinated transmission scheme, signals that are transmitted over respective first and second communication channels. Respective channel measures are calculated for the communication channels based on the received signals. First and second feedback data, which are indicative of the respective channel measures of the first and second communication channels, are formulated such that the first feedback data has a first data size and the second feedback data has a second data size, different from the first data size. The first and second feedback data are transmitted from the mobile communication terminal to at least one of the base stations.
    Type: Grant
    Filed: November 6, 2012
    Date of Patent: December 30, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Krishna Srikanth Gomadam, Adoram Erell, Daniel Yellin
  • Patent number: 8918136
    Abstract: Adjustment of a downlink transmit power parameter, such as a ceiling level, is disclosed. Signal-to-noise type information and committed power information can be employed to determine the ceiling level adjustment. A ceiling level can be a predetermined cap on transmission power for downlink channels between a user equipment and a base station. Where there is sufficient headroom in total transmission power and a power level greater than the predetermined ceiling can be effective, the ceiling can be adjusted to greater values than the predetermined value. Where total transmission power is more committed, ceiling adjustment can be prevented. Further, where there is no adequate benefit from increasing the ceiling, the adjustment of the ceiling can be prevented. While some instances can result in optimized transmission levels below the ceiling, instances can also be accommodated where the ceiling is to be increased.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: December 23, 2014
    Assignee: AT&T Mobility II LLC
    Inventors: Vladimir Gusavac, Manish Vaishnav
  • Patent number: 8917647
    Abstract: An apparatus, system and method for providing interference cancellation and communication resource reservation limits to allocate communication resources in a communication system. In one embodiment, the apparatus includes a processor (1320) and memory (1350) including computer program code. The memory (1350) and the computer program code are configured, with the processor (1320), to cause the apparatus to identify an interval of received signal power levels for interference cancellation of an interfering signal to a primary signal, and generate a message that provides the interval of received signal power levels for the interference cancellation of the interfering signal to the primary signal. In a related embodiment, the memory (1350) and the computer program code are configured, with the processor (1320), to cause the apparatus to determine a communication resource reservation limit, and request an increase in the communication resource reservation limit.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: December 23, 2014
    Assignee: Nokia Corporation
    Inventor: Markus Nentwig
  • Patent number: 8918053
    Abstract: Embodiments of the present invention disclose an interference elimination method and apparatus for a multi-antenna system. The method includes: generating an equalization coefficient according to a baseband signal received on a receiving antenna, a channel estimation matrix, and an obtained cross-correlation matrix of transmitted signals of a downlink channel on multiple transmit antennas; and performing interference elimination processing on the baseband signal according to the equalization coefficient.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: December 23, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yi Yang, Shuojun Yu, Gengshi Wu, Nian Peng, Feng Li
  • Patent number: 8913961
    Abstract: Systems and methods are disclosed which relate to mitigating the detrimental effects of interference to electronic devices from mobile telephones utilizing any form of time-domain multiplexing technology. A wireless transmitter inside the mobile telephone broadcasts a warning transmission which can be received by affected devices. Once the warning transmission is received by an affected device, the device activates a blanking circuit comprising an actuator and a switch or switches. The switches open for the duration of the interference so that the user does not receive undesired output such as: noise through a speaker, noise through a microphone, or other interference with electrical signals.
    Type: Grant
    Filed: November 13, 2008
    Date of Patent: December 16, 2014
    Assignee: AT&T Mobility II LLC
    Inventors: Scott Dale Prather, Cameron Kelly Coursey, Herman Chien
  • Patent number: 8913969
    Abstract: The present disclosure relates to amplitude based pre-distortion calibration of an RF communications terminal, such as a cell phone, by transmitting a first standard RF transmit burst from the RF communications terminal to an RF test instrument, which assimilates the first standard RF transmit burst. A calibration control system extracts information regarding the first standard RF transmit burst from the RF test instrument; determines amplitude based distortion of the RF communications terminal using the extracted information; determines amplitude based pre-distortion calibration information using the determined amplitude based distortion; and calibrates the RF communications terminal using the amplitude based pre-distortion calibration information. By using a single-shot transmit burst, calibration times may be minimized.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: December 16, 2014
    Assignee: RF Micro Devices, Inc.
    Inventors: Hirofumi Honjo, Suryanarayana Pappu, Mikko Sannala, Ricke W. Clark
  • Patent number: 8913694
    Abstract: A direct conversion transmitter has a mixer stage to up-convert an input signal to the frequency of a local oscillator (LO). A DC offset circuit is coupled to an input signal port to apply a set of DC offset signal values. A processor determines a set of optimal DC offset signal values by no more than three differential spectral measurements made at the transmitter output port with a test signal applied at the input port. Optimal DC offset signal values are those that, when applied to the input signal at the input port of the transmitter, minimize an LO leakage component of the transmit signal at the output signal port of the transmitter. The optimal DC offset values are stored in memory and retrieved and applied to information bearing signals provided as the input signal once those optimal DC offset values have been determined.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: December 16, 2014
    Assignee: MStar Semiconductor, Inc.
    Inventors: Wael Al-Qaq, Dennis Mahoney
  • Patent number: 8908751
    Abstract: One embodiment of the present invention relates to a method and apparatus are provided herein for reducing the power consumption of a transmission chain while maintaining an acceptable figure of merit (e.g., linearity). In one embodiment, an adaptive biasing element is configured to perform adaptive biasing to reduce current consumption of a transmission chain by adjusting the operating point of one or more transmission chain elements (e.g., power amplifier, mixer, etc.). However, since adaptive biasing may reduce the linearity of a transmitted signal, its use is limited by the degradation of figure of merit caused by the introduced non-linearities. Accordingly, a pre-distortion element may be configured to perform adaptive digital pre-distortion (DPD) on a transmission chain input signal to account for non-linearities generated through the adaptive biasing, therefore allowing the adaptive biasing to further reduce the current consumption while maintaining an acceptable figure of merit.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: December 9, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Andrea Camuffo, Chi-Tao Goe, Bernhard Sogl, Sandro Pinarello, Jan-Erik Mueller, Nick Shute
  • Patent number: 8909283
    Abstract: A method and a serving NodeB for adjusting transmit power of a User Equipment (UE) having multiple transmitter chains to reduce relative phase discontinuity (RPD) between a Sounding Reference Signal (SRS) and a Physical Uplink Shared Channel (PUSCH). The NodeB receives from the UE, an RP characteristic of the UE and, based on the RP characteristic, selects an SRS or PUSCH transmit power level for the UE so as to reduce the RPD. The NodeB instructs the UE to set the SRS or PUSCH transmit power level to the level selected by the NodeB.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: December 9, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Chester Park, Kumar Balachandran
  • Patent number: 8908745
    Abstract: The present invention provides a transmission system, including: a transmitter including a transmitter filter; a receiver including a receiver filter; and a communicative coupling between the transmitter and the receiver; wherein the transmitter filter and the receiver filter are matched for noise reduction, and wherein the combined responses of the transmitter filter and the receiver filter satisfy the Nyquist criteria. Optionally, the transmitter filter includes a pulse shaping quasi digital finite impulse response filter. Optionally, the receiver filter includes an inductor-capacitor ladder based filter.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: December 9, 2014
    Assignee: Ciena Corporation
    Inventors: Vladimir Pelekhaty, Michael Y. Frankel, Michael J. Wingrove
  • Patent number: 8903002
    Abstract: A computational processor uses a binary signal, being a set of 1- or 0-valued elements of a same number as a number of elements in an input signal, to generate computational data whose elements are exclusive OR values between each element of the input signal and a corresponding element in the binary signal at a same position. The modulator 13 modulates the input signal and the computational data according to a primary modulation scheme, and generates primary-modulated signals. An IFFT calculator applies an inverse fast Fourier transformation to the primary-modulated signals to generate inverse transformation data. A transmitter generates a baseband signal based on generated inverse transformation data whose peak-to-average power ratio matches a standard, and generates and transmits a transmission signal from the baseband signal and data specifying computations conducted to generate the inverse transformation data that matches the standard.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: December 2, 2014
    Assignee: Icom Incorporated
    Inventor: Nobuyoshi Nishikawa