Noise Or Interference Elimination Patents (Class 455/114.2)
  • Patent number: 8903344
    Abstract: Disclosed are circuits, techniques and methods for implementing an attenuator in a signal transmission path. In one particular implementation, an attenuation may be adjusted based, at least in part, on a control signal. In another implementation, such an attenuation may be adjusted in coarse increments by varying one or more gate voltages applied one or more transistors. In yet another implementation, adjusting said attenuation in fine increments by varying a bias voltage applied to at least one level shifter.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: December 2, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Hongyan Yan, Bhushan Shanti Asuri, Vinod V Panikkath, Janakiram G Sankaranarayanan, Himanshu Khatri
  • Patent number: 8903336
    Abstract: A method for compensating signal distortions in multiple transmitting branches entering a composite amplifier.
    Type: Grant
    Filed: May 13, 2013
    Date of Patent: December 2, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Tony Fonden, Richard Hellberg, Mats Klingberg, Spendim Dalipi
  • Publication number: 20140349590
    Abstract: A data transmission method includes transmitting an encoded data signal in form of a data stream of data bursts between a transmitter and a receiver, making a decision as a function of at least one data transmission parameter as to whether an interference treatment o the data signal to be transmitted will be performed in the transmitter or in the reciver, performing the interference treatment in terms of at least on code in the transmitter, and performing ther interference treatment of the data to be transmitted in terms of at least one further code in the reciver.
    Type: Application
    Filed: August 4, 2014
    Publication date: November 27, 2014
    Inventors: Frank KOWALEWSKI, Peter MANGOLD
  • Patent number: 8891700
    Abstract: Interference in a wireless network is detected by first applying during a detection stage a two-sample Kolmogorov-Smirnov (KS) test to samples obtained from a channel in the wireless network to obtain a KS statistic. When the KS statistic is larger than a predetermine threshold, it is determined that the samples include narrowband interference, and wideband otherwise.
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: November 18, 2014
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Kyeong-Jin Kim, Philip Orlik, Ghulam M Bhatti
  • Patent number: 8892140
    Abstract: A method and apparatus for bi-direction training in D2D/cellular networks. An embodiment method includes sending training symbols to sense interference from the cellular UEs, calculating an interference subspace from the cellular UE to each of the D2D UEs, calculating an orthogonal projection matrix based on the interference subspace calculated, and iteratively updating receive filters through forward training and transmit beamformers through backward training after the orthogonal projection matrix is calculated to align the D2D UEs. In an embodiment, training symbols are sent to sense interference from the cellular UE.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: November 18, 2014
    Assignee: Futurewei Technologies, Inc.
    Inventors: Binnan Zhuang, Weimin Xiao, Philippe Sartori, George Calcev, Fei Teng
  • Patent number: 8891701
    Abstract: An electronic receiver may comprise nonlinear distortion modeling circuitry, interference estimation circuitry, and sequence estimation circuitry. The receiver may receive an orthogonal frequency division multiplexing (OFDM) symbol in the form of an electromagnetic signal. The nonlinear distortion modeling circuitry may generate a nonlinear distortion model that models nonlinear distortion introduced to the received electromagnetic signal en route to the sequence estimation circuitry. The interference estimation circuitry may estimate inter-subcarrier interference present in the received OFDM symbol based on the generated nonlinear distortion model. The estimating of the inter-subcarrier interference may comprise applying the nonlinear distortion model to one or more candidate vectors generated by the sequence estimation circuitry. The sequence estimation circuitry may sequentially process a plurality of received virtual subcarrier values of the OFDM symbol using the estimated inter-subcarrier interference.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: November 18, 2014
    Assignee: MagnaCom Ltd.
    Inventors: Amir Eliaz, Ilan Reuven
  • Patent number: 8891672
    Abstract: A transceiver including a filter, a transmitter, a receiver, a measurement module and a gain module. The filter is configured to (i) receive an input signal, and (ii) filter the input signal to generate an output signal. The transmitter is configured to transmit the output signal based on (i) a gain of the transmitter, and (ii) a power output of the transmitter. The receiver is configured to receive the output signal, where the output signal is fed back from the transmitter to the receiver. The measurement module is configured to, based on the output signal, generate a linearity signal, where the linearity signal is indicative of the linearity of the transmitter. The gain module is configured to, based on the linearity signal, adjust the gain of the transmitter to maximize the power output of the transmitter. The filter is configured to filter the input signal based on the linearity signal.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: November 18, 2014
    Assignee: Marvell International Ltd.
    Inventors: Wayne A. Loeb, David M. Signoff
  • Patent number: 8891347
    Abstract: Systems and methods for wireless communication in a system including a transmitter, a receiver, and a plurality of propagation paths formed between the transmitter and the receiver which are capable of carrying a signal transmitted by the transmitter to the receiver. The method includes transmitting a first signal from the transmitter to the receiver via a propagation path of the plurality of propagation paths, receiving the first signal at the receiver, performing a channel estimation of the first signal to obtain path parameter information of the propagation path, sending the channel estimation from the receiver to the transmitter via the propagation path, predistorting a second signal at the transmitter according to the channel estimation, transmitting the predistorted signal from the transmitter to the receiver via the propagation path, and receiving the predistorted signal at the receiver.
    Type: Grant
    Filed: July 28, 2011
    Date of Patent: November 18, 2014
    Assignee: Empire Technology Development LLC
    Inventor: Xuefeng Yin
  • Patent number: 8885852
    Abstract: Technologies are generally described for a system for controlling an audio signal based on a proximity of, e.g., a user's hand to at least one component of an audio control system. In some examples, an audio control system may include a filter configured to provide an echo signal and a control decision unit configured to provide a control signal based on the echo signal.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: November 11, 2014
    Assignee: Empire Technology Development LLC
    Inventor: Seungil Kim
  • Patent number: 8879663
    Abstract: Adaptive filtering is used to substantially cancel distortion in radio frequency (RF) signals. Such adaptive filtering can be used in an RF transmitting module to pre-compensate an RF signal with compensation (inverse) distortion to cancel inherent transmission path distortion from the RF signal. Adaptive filtering can also be used in a multi-carrier RF receiving module to cancel from a given carrier signal distortion due to cross talk from adjacent carrier signals. Adaptive filtering in an RF transceiver can be used to cancel from a received RF signal distortion arising from leakage of a transmit signal into the receive path.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: November 4, 2014
    Assignee: L-3 Communications Corp.
    Inventors: Osama S. Haddadin, Roy E. Prymek, William K. McIntire
  • Patent number: 8880010
    Abstract: A transmitter circuit is described. The transmitter circuit includes a first local oscillator that generates a first frequency equal to a duplex frequency. The transmitter circuit also includes a second local oscillator that generates a second frequency equal to a receive frequency. The transmitter circuit further includes a first mixer that combines the first frequency with a first input signal. The transmitter circuit also includes a first feedback loop. The first feedback loop includes a second mixer that combines the second frequency with a transmit signal and a first filter and a first adder that combines an output of the first mixer with an output of the first filter. The transmitter circuit also includes a third local oscillator that generates a third frequency equal to the receive frequency. The transmitter circuit further includes a third mixer that combines the third frequency with an output of the first adder.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: November 4, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Gary J. Ballantyne
  • Patent number: 8879997
    Abstract: Cross-polar discrimination (XPD) of a dual orthogonal cross-polarized antenna is maximized via a cross-coupling network between base station MIMO branches prior to connection to the base station antenna. In one embodiment, a cross coupling network combines each MIMO branch signal with an attenuated phase reversed (phase shifted) copy of the other MIMO branch signal. The amount of attenuation for each branch is equivalent to the cross polar suppression required for each antenna array. The cross-coupling can be applied at different stages of signal processing within a base station.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: November 4, 2014
    Assignee: Quintel Technology Limited
    Inventors: David Edwin Barker, David Sam Piazza, Stephen Thomas Newbold
  • Patent number: 8874153
    Abstract: Interference to a received signal is reduced in a wireless network, the interference comprising intermodulation products of at least a first signal and a second signal. Delayed interference signals comprising simulated intermodulation products are generated on the basis of the first signal and the second signal using a range of differing delay values and each of the delayed interference signals is correlated with the received signal to produce data representing a correlation for each delayed interference signal. At least one delay value is selected in dependence on a the data representative of the correlations and an interference signal comprising simulated intermodulation products generated from the first signal and the second signal using the at least one delay value is combined with the received signal.
    Type: Grant
    Filed: August 13, 2012
    Date of Patent: October 28, 2014
    Assignee: Aceaxis Limited
    Inventors: David Damian Nicholas Bevan, Simon John Gale, Fiona Maihri Wilson
  • Patent number: 8873651
    Abstract: An OFDM generation apparatus and methods for generating OFDM transmission signals from OFDM symbols, each including a plurality of OFDM subcarriers, for transmission in a multi-carrier data transmission system, is provided. The provided apparatus and method may use a selected mixing frequency for mixing complex time-domain samples of OFDM symbols from a baseband frequency up to a passband frequency to obtain OFDM transmission signals, wherein the mixing frequency is selected such that common phase rotations of the OFDM subcarriers of OFDM symbols with respect to adjacent OFDM symbols of the OFDM transmission signals are avoided or compensated after the mixing. Additional apparatuses and methods for avoidance or compensation of such common phase rotations are also provided.
    Type: Grant
    Filed: January 12, 2011
    Date of Patent: October 28, 2014
    Assignee: Sony Corporation
    Inventors: Nabil Muhammad, Lothar Stadelmeier, Joerg Robert
  • Patent number: 8873683
    Abstract: A receiver circuit receives a signal including a first reference signal from a first antenna port that is allocated to the UE. The receiver circuit includes a descrambling and despreading unit that despreads and descrambles the signal using a spreading code of the first antenna port and a scrambling sequence assigned to the UE to generate a first antenna port signal. The descrambling and despreading unit despreads and descrambles the signal using a spreading code of a second antenna port and the scrambling sequence assigned to the UE, wherein the second antenna port is unallocated to the UE to generate a second antenna port signal. A channel estimator generates a channel estimate of the first antenna port based on the first antenna port signal. An estimation unit estimates an interference and noise covariance measure based on the first antenna port signal, the channel estimate and the second antenna port signal.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: October 28, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Rajarajan Balraj, Biljana Badic, Tobias Scholand
  • Patent number: 8867667
    Abstract: Systems, methods, and devices to enable monitoring of wireless networks are described herein. In some aspects, a low power receiver or a receiver operating in a low power mode scans for signals with a moderate or low duty cycle. If a signal identifying a device or user of the receiver, or a signal indicating that there will be a subsequent data communication, is received, a high power receiver or a receiver operating in a high power mode is activated to receive data communications.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: October 21, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Mohammad Hossein Taghavi Nasrabadi, Hemanth Sampath, Didier Johannes Richard Van Nee
  • Patent number: 8867648
    Abstract: The present application discloses a method for reporting channel status information in a multi antenna wireless communication system. In more detail, the method includes: receiving a reference signal from a base station; calculating the optimum precoding matrix index (PMI), at which the intensity of a signal from the base station is maximized, on the basis of the reference signal: determining at least one interference PMI from the base station on the assumption that a plurality of interference PMIs corresponding to the optimum PIM are applied; and transmitting information on at least one determined interference PMI to the base station. Beams corresponding to the plurality of interference PMIs are orthogonal to the beams corresponding to the optimum PMI.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: October 21, 2014
    Assignee: LG Electronics Inc.
    Inventors: Hyungtae Kim, Hanbyul Seo, Daewon Lee
  • Patent number: 8867659
    Abstract: A communications device includes a transmitter, a transmission processing device, a receiver, and a reception processing device. The transmission processing device assigns signal-space points within an I/Q signal space to digital signals, which include data values. The reception processing device assigns data values to signal-space points. The transmitter generates a transmission signal from signal-space points to be transmitted. The receiver determines received signal-space points from a received signal. The individual transmitted and received signal-space points provide in each case a smaller spacing distance from adjacent signal-space points than from the origin of the signal space.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: October 21, 2014
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventor: Detlev Liebl
  • Patent number: 8861428
    Abstract: A system and process that incorporates teachings of the subject disclosure may include, for example, an interference monitor configured to detect occurrences of unintended signals within a communications link. A communications link may carry a down-converted format of a satellite signal from an earth terminal to an integrated receiver and decoder for further network distribution. Depending upon the nature of any such detected unintended signals, the communications link can be “swapped out” for a redundant communications link carrying a down-converted format of the same satellite signal obtained by way of a redundant earth terminal. Other embodiments are disclosed.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: October 14, 2014
    Assignee: AT&T Intellectual Property I, LP
    Inventors: Douglas Medina, Ronald Jones, Michael Peck
  • Patent number: 8861641
    Abstract: A wireless communication device includes a mixer that multiplies quadrature-modulated transmission data by a local oscillation frequency signal and outputs a high-frequency signal; a distributor that distributes the high-frequency signal; a detector circuit that detects a direct current component included in the high-frequency signal, based on the high-frequency signal distributed by the distributor; a correction signal generating unit that generates a correction signal for removing the direct current component from the high-frequency signal, based on the direct current component detected by the detector circuit; a correction unit that corrects the high-frequency signal by the correction signal generated by the correction signal generating unit; and a transmission unit that transmits the high-frequency signal that has been corrected by the correction unit.
    Type: Grant
    Filed: January 7, 2011
    Date of Patent: October 14, 2014
    Assignee: NTT DoCoMo, Inc.
    Inventors: Shinya Oka, Takashi Okada
  • Patent number: 8860524
    Abstract: A polar modulator of the present invention includes: a first function block which generates an amplitude signal and a phase signal; a second function block which adjusts the signal delay between the amplitude signal and the phase signal; a third function block which allows the low frequency component of the amplitude signal to pass therethrough; a fourth function block which modulates the phase of the phase signal; a fifth function block which outputs a modulation voltage, based on the amplitude signal; a sixth function block which modulates the amplitude of the phase signal, based on the modulation voltage; a seventh function block which measures the temperature of at least one function block; and an eighth function block which calculates a compensation amount for the signal delay, based on the measured temperature. The second function block adjusts the signal delay, based on the compensation amount.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: October 14, 2014
    Assignee: Panasonic Corporation
    Inventors: Shigeru Morimoto, Kaoru Ishida, Maki Nakamura
  • Patent number: 8855182
    Abstract: In an emphasis optimization device, a calculating unit calculates an inverse characteristic of an amplitude characteristic based on the amplitude characteristic of a transmission path, and an inverse Fourier transform unit performs an inverse Fourier transform on the inverse characteristic to obtain an impulse response. An extracting unit extracts, from the obtained impulse response, an impulse response corresponding to the number of taps necessary for emphasis to be added to a digital signal to be transmitted on the transmission path. An emphasis amount calculating unit converts the extracted impulse response into a value of the emphasis to calculate an emphasis amount.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: October 7, 2014
    Assignee: Anritsu Corporation
    Inventors: Takashi Murakami, Kosuke Sasaki, Ken Mochizuki
  • Patent number: 8855580
    Abstract: Circuits and methods are disclosed for reducing interference from transmitter leakage in a radio transceiver. An exemplary method for reducing interference from transmitter leakage in a radio transceiver comprises downconverting, filtering, and sampling a radio frequency signal comprising a desired signal and a transmitter leakage signal to obtain a sampled signal of interest. The method further comprises generating a sampled distortion signal estimate that estimates one or more distortion products of the transmitter leakage signal, such as a squared amplitude obtained from a square-law device or corresponding digital function. Finally, the method comprises combining the sampled distortion signal estimate with the sampled signal of interest to obtain interference-reduced signal samples.
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: October 7, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Paul Wilkinson Dent, Sven Mattisson
  • Patent number: 8855233
    Abstract: An apparatus for implementing digital baseband predistortion includes a transmission channel including a digital-to-analog converter, a modulator, an amplifier and a power amplifier, and further includes a feedback channel analog part including a diode detector, a filter and an analog-to-digital converter, and a feedback channel digital part including a predistorter, a mode obtaining unit, a predistortion coefficient generator and a feedback correcting unit. The diode detector is configured to obtain an envelope of an output signal of the power amplifier. Embodiments of the present invention further provide a method for implementing digital baseband predistortion by applying the foregoing single-chip. Due to a simple structure of the diode detector, not only the number of radio frequency devices on the feedback channel is reduced, implementation complexity of hardware is lowered, power consumption is reduced, but also a feedback channel analog part may be integrated onto the single-chip.
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: October 7, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Hua Cai, Yanzhao Pang, Wei Wang, Wei Xue
  • Patent number: 8855585
    Abstract: Apparatus and methods are disclosed related to low-voltage radio transmitters with high spectral purity. One such apparatus includes a baseband path with a predistortion stage, a programmable filter, and an upconverter core. In an embodiment, the programmable filter is placed between the predistortion stage and the upconverter core. In an embodiment, the programmable filter is configured by a controller to reject out-of-band noise introduced at the predistortion stage or earlier.
    Type: Grant
    Filed: August 2, 2010
    Date of Patent: October 7, 2014
    Assignee: Analog Devices, Inc.
    Inventor: Antonio Montalvo
  • Patent number: 8855569
    Abstract: Systems and methods for communicating with a radio frequency (RF) device are disclosed herein. In particular, a method of the present disclosure includes: listening for a first hailing signal to be received on at least one hailing channel selected from a plurality of hailing channels, selecting at least one hailing channel based upon a system time and a node identification; determining a noise floor for the at least one hailing channel; and upon receiving a noise signal on the at least one hailing channel, adjusting the noise floor in response to the noise signal.
    Type: Grant
    Filed: December 29, 2011
    Date of Patent: October 7, 2014
    Assignee: Mueller International, LLC
    Inventors: David Edwin Splitz, William Charles Shoesmith, Robert Henry Grady
  • Patent number: 8855588
    Abstract: A power amplifying apparatus is provided. A reference signal generator provides a reference signal having an enabling state and a disabling state. A digital power amplifier generates a current based on the reference signal and an input signal. An output signal of the digital power amplifier is related to the current. When the reference signal is in the enabling state, the current is related to the input signal. When the reference signal is in the disabling state, the current is irrelevant to the input signal. During the enabling state of the reference signal, a data generator provides an output alternating between an in-phase signal and a quadrature-phase signal as the input signal to the digital power amplifier. When the reference signal is in the disabling state, the data generator provides a fixed signal as the input signal to the digital power amplifier.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: October 7, 2014
    Assignee: MStar Semiconductor, Inc.
    Inventors: Chih-Ming Hung, Zhong-Xuan Zhang, Sheng-Che Tseng
  • Patent number: 8848819
    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: September 8, 2011
    Date of Patent: September 30, 2014
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 8849293
    Abstract: A user equipment is able to transmit, to a wireless access node, an indication of in-device coexistence (IDC) interference between the wireless interfaces. The user equipment can include a counter to track a number of transmissions having the indication of IDC interference.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: September 30, 2014
    Assignee: Blackberry Limited
    Inventors: Changhoi Koo, Zhijun Cai, Jun Li
  • Patent number: 8848822
    Abstract: A feedback method for interference alignment in wireless network having K transmitters and K receivers, the method including: transmitting, by a transmitter n?1, a precoding vector of the transmitter n?1 (n being an integer between 2 and K?1) to a receiver n+1; calculating, by the receiver n+1, a precoding vector of a transmitter n using the precoding vector of the transmitter n?1; and transmitting, by the receiver n+1, the precoding vector of the transmitter n to the transmitter n.
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: September 30, 2014
    Assignees: LG Electronics Inc., Industry-Academic Cooperation Foundation, Yonsei University
    Inventors: Han Byul Seo, Kaibin Huang, Soon Suk Roh, Sung Yoon Cho, Hyuk Jin Chae, Byoung Hoon Kim, Dong Ku Kim
  • Patent number: 8849327
    Abstract: An apparatus and a method for controlling power in a wireless communication system are provided. The method includes receiving interference information comprising a resource usage rate, from at least one neighboring BS, calculating a throughput variance amount, which is expected if the serving BS changes power, experienced by the at least one neighboring BS, by using the interference information, calculating a throughput variance amount, which is expected if the serving BS changes power, of at least one Mobile Station (MS) having access to the serving BS, and controlling power for the at least one MS by using the throughput variance amount experienced by the at least one neighboring BS and the throughput variance amount of the at least one MS. The interference information represents a throughput variance amount generated in the at least one neighboring BS when the serving BS changes the power.
    Type: Grant
    Filed: February 8, 2013
    Date of Patent: September 30, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Nam-Koo Kang
  • Patent number: 8849208
    Abstract: An apparatus is provided to include a detector. The detector can detect that an interfering communications connection to a received satellite system signal in a mobile terminal is to be established by the mobile terminal. The apparatus include a processor that can prevent interference to the received satellite system signal due to the interfering communications connection by controlling uplink resource allocation of the mobile terminal based on the detection.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: September 30, 2014
    Assignee: Nokia Corporation
    Inventors: Petri Vasenkari, Mikko Pesola
  • Publication number: 20140287704
    Abstract: Logarithmic Detector Amplifiers (LDAs), multiple antennas, active antennas, and multiple active antennas and receivers are provided in a variety of configurations that are synchronized to reduce or eliminate interference so at to provide, a greater range and bandwidth between wireless routers and their clients in WLAN and WAN environments.
    Type: Application
    Filed: March 14, 2014
    Publication date: September 25, 2014
    Inventors: Alexandre Dupuy, Patrick Rada, Forrest Brown
  • Patent number: 8843166
    Abstract: A method for interference alignment in wireless network having 3 transmitters and 3 receivers which are equipped with M antennas is provided. The method comprising: transmitting, performed by each of the 3 transmitters, a pilot signal known to the 3 receivers; estimating, performed by each of the 3 receivers, each channel from transmitter; transmitting, performed by each of the 3 receivers, feedback information to target transmitter; and determining, performed by transmitter 2 and transmitter 3, a precoding vector; wherein a degree of freedom (DoF) of a transmitter 1 is (M/2??), a DoF of the transmitter 2 or the transmitter 3 is M/2.
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: September 23, 2014
    Assignees: LG Electronics Inc., Industry-Academic Cooperation Foundation, Yonsei University
    Inventors: Han Byul Seo, Kaibin Huang, Soon Suk Roh, Sung Yoon Cho, Hyuk Jin Chae, Byoung Hoon Kim, Dong Ku Kim
  • Patent number: 8843180
    Abstract: Embodiments for at methods, apparatus and systems for operating a voltage regulator are disclosed. One apparatus includes a switching voltage regulator, wherein the switching voltage regulator includes a series switch element, a shunt switch element, a switching controller and a switched output filter. The switching controller is configured to generate a switching voltage through controlled closing and opening of the series switch element and the shunt switch element. The switched output filter filters the switching voltage and generates a regulated output voltage, wherein the switched output filter includes a plurality of capacitors that are selectively included within the switched output filter.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: September 23, 2014
    Assignee: R2 Semiconductor, Inc.
    Inventors: James E. C. Brown, Daniel Dobkin, Pablo Moreno Galbis, Cory Severson, Lawrence M. Burns
  • Patent number: 8843088
    Abstract: Included is a radio transmission system comprising a plurality of power amplifiers (PAs); a plurality of Volterra Engine (VE) linearizers corresponding to the PAs; a plurality of feedback loops corresponding to the PAs; at least one digital hybrid matrix (DHM) coupled to the VE linearizers; and an analog hybrid matrix (AHM) coupled to the PAs, wherein the feedback loops are connected to the AHM and the VE linearizers but not to the PAs to reduce the number of feedback loops. Also included is a radio system comprising a plurality of PAs; a Volterra DHM (VDHM) coupled to the PAs; a plurality of feedback loops corresponding to the PAs; and an AHM coupled to the PAs, wherein the feedback loops are connected to the AHM but not to the PAs to reduce the number of feedback loops.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: September 23, 2014
    Assignee: Apple Inc.
    Inventors: John-Peter van Zelm, Peter Rashev
  • Patent number: 8843142
    Abstract: A radio communication apparatus is disclosed that enables the influence of the feedback information on the channel capacity to be kept to the minimum without reducing the transmission efficiency of information by transmission of pilot symbol. In the apparatus, a delay dispersion measuring section (272) generates a delay profile using the received signal, and measures delay dispersion indicative of dispersion of delayed versions. A moving speed estimating section (274) estimates moving speed of a mobile station apparatus that transmits a pilot symbol based on the variation in reception power of the pilot symbol. An other-cell interference measuring section (276) measures other-cell interference caused by signals transmitted in cells except the cell to which the apparatus belongs.
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: September 23, 2014
    Assignee: Godo Kaisha IP Bridge 1
    Inventors: Akihiko Nishio, Atsushi Matsumoto
  • Publication number: 20140273895
    Abstract: A process transmitter is configured to measure a process variable of an industrial process. The process transmitter includes a process variable sensor which senses the process variable and responsively provides a process variable sensor output. Sensor circuitry is coupled to the process variable sensor. A housing to encloses the sensor circuitry and the output circuitry. The sensor circuitry electrical couples to the housing. The sensor circuitry wirelessly communicates with the output circuitry.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: Rosemount Inc.
    Inventor: Eugene Korolev
  • Patent number: 8837749
    Abstract: Broadly speaking, the embodiments disclosed herein describe an apparatus, system, and method for managing the effects of TDMA noise emitted by a communication device on an audio circuit.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: September 16, 2014
    Assignee: Apple Inc.
    Inventor: Edwin W. Foo
  • Patent number: 8837572
    Abstract: A receiver and a method for equalizing signals, the method includes: receiving input signals; sampling the input signals to provide oversampled samples; processing the oversampled samples to provide symbol spaced samples and to provide fractionally spaced samples that represent the oversampled samples; calculating taps of a fractionally spaced equalizer based on the symbol spaced samples; feeding the taps to the fractionally spaced equalizer; and filtering the fractionally spaced samples by the fractionally spaced equalizer to provide equalized samples.
    Type: Grant
    Filed: November 26, 2009
    Date of Patent: September 16, 2014
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Weizhong Chen, Noam Zach, Gideon Kutz
  • Patent number: 8837635
    Abstract: Embodiments provide systems and methods to dynamically control a radio frequency (RF) transmitter based on monitored error vector magnitude (EVM) performance. Embodiments are enabled by a feedback path that allows estimating the EVM at the output of the transmitter and controlling the transmitter, including the power amplifier (PA), accordingly. As such, the transmitter (and the PA) can be operated as close as possible to the ideal operating point that meets, based on actual conditions, a specified EVM performance and desired output power. By doing so, the overall power consumption of the transmitter is reduced.
    Type: Grant
    Filed: June 7, 2012
    Date of Patent: September 16, 2014
    Assignee: Broadcom Corporation
    Inventors: Robert Lorenz, Djordje Tujkovic
  • Patent number: 8831138
    Abstract: The circuit is provided for the transmission of data amplitude modulated radio frequency signals. The circuit includes a local oscillator for generating an oscillating signal at a determined carrier frequency, a unit for shaping data pulses to supply a data amplitude modulation control signal (Vmod), and a power amplifier receiving the oscillating signal and the data amplitude modulation control signal (Vmod) for the transmission of data amplitude modulated radio frequency signals by an antenna or an antenna arrangement. The data pulse shaping unit (13) includes a pulse shaper (21) for digitally adapting the data transition edges on the basis of an incoming digital data signal (d), and a digital-analog conversion stage (26, 27) for converting a digital data signal shaped in the unit, in order to supply the data amplitude modulation control signal (Vmod) to the power amplifier.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: September 9, 2014
    Assignee: EM Microelectronic-Marin SA
    Inventor: Michel Moser
  • Patent number: 8831130
    Abstract: A data transmission method includes transmitting an encoded data signal in form of a data stream of data bursts between a transmitter and a receiver, making a decision as a function of at least one data transmission parameter as to whether an interference treatment of the data signal to be transmitted will be performed in the transmitter or in the receiver, performing the interference treatment in terms of at least one code in the transmitter, and performing the interference treatment of the data to be transmitted in terms of at least one further code in the receiver.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: September 9, 2014
    Assignee: Ipcom GmbH & Co. KG
    Inventors: Frank Kowalewski, Peter Mangold
  • Patent number: 8831550
    Abstract: Filter coefficients are generated by testing a wireless communication system using single-tone signals. While using the filter coefficients in a filter module, signal imbalance caused by a local oscillator or analog elements in a wireless communication system can be eliminated, so as to prevent the wireless communication system from being affected by the noises.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: September 9, 2014
    Assignee: Realtek Semiconductor Corp.
    Inventors: Yuan-Shuo Chang, Wen-Shan Wang
  • Patent number: 8831542
    Abstract: A method, apparatus and computer program product are provided for conveying information regarding the antenna configuration and/or the transmission diversity scheme to a recipient, such as a mobile device. In particular, information regarding the antenna configuration and/or the transmission diversity scheme can be conveyed by masking, such as cyclic redundancy check masking, to provide information regarding the antenna configuration and/or the transmission diversity scheme. In this regard, a set of masks can be determined based upon hamming distances between the masks and bit diversities between the masks and where each of the masks within the set is associated with an antenna configuration and a transmission diversity scheme.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: September 9, 2014
    Assignee: Nokia Corporation
    Inventors: Timo Eric Roman, Bernhard Raaf, Mieszko Chmiel
  • Patent number: 8831654
    Abstract: An apparatus and method of multi cell cooperation is provided. The user equipment receives transmission beam forming information from a first cooperative cell, generates serving cell feedback information and cooperative cell feedback information on the basis of the transmission beam forming information, transmits the serving cell feedback information to a serving cell, and transmits the cooperative cell feedback information to a second cooperative cell.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: September 9, 2014
    Assignee: LG Electronics Inc.
    Inventors: Hyung Tae Kim, Han Byul Seo, Byoung Hoon Kim, Ki Jun Kim
  • Patent number: 8825065
    Abstract: Methods and apparatus for reducing out of band emissions through selective resource allocation, transmit power control, or a combination thereof. A resource controller, such as a base station, can allocate uplink resources to a requesting subscriber station based in part on an expected transmit power. The base station can allocate uplink bandwidth to the subscriber station based on an expected subscriber station uplink transmit power and a frequency of a restricted emissions band. Those subscriber stations having higher expected transmit powers are allocated bandwidth further from the restricted emissions band. The subscriber station can perform complementary transmit power control based on allocated uplink resources. The subscriber station can limit a transmit power based in part on a bandwidth allocation, modulation type allocation, or some combination thereof.
    Type: Grant
    Filed: January 19, 2007
    Date of Patent: September 2, 2014
    Assignee: Wi-Lan, Inc.
    Inventor: Todd Sutton
  • Patent number: 8825116
    Abstract: An audio interface adapted to reduce a subscriber voice may receive a subscriber voice and a background noise. The subscriber voice may then be compared to the to the background noise. If the received subscriber voice is louder than the received background noise, the audio interface may output a message to the cellular telephone subscriber indicating the subscriber may reduce his speaking volume. Additionally, an audio interface may process a voice waveform that corresponds to the subscriber voice and a background waveform that corresponds to the background noise to generate a substantially opposite voice waveform and a substantially opposite background waveform respectively. The substantially opposite voice waveform and background waveform may be substantially out of phase from the voice waveform and background waveform respectively and output via one or more output ports of the audio interface.
    Type: Grant
    Filed: May 9, 2013
    Date of Patent: September 2, 2014
    Assignee: AT&T Mobility II LLC
    Inventors: Jeffrey Mikan, Justin McNamara, Fulvio Cenciarelli, Anastasios L. Kefalas, John E. Lewis
  • Patent number: 8824979
    Abstract: Interference that occurs during wireless communication may be managed through the use of fractional reuse and other techniques. In some aspects fractional reuse may relate to HARQ interlaces, portions of a timeslot, frequency spectrum, and spreading codes. Interference may be managed through the use of a transmit power profile and/or an attenuation profile. Interference also may be managed through the use of power management-related techniques.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: September 2, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Mehmet Yavuz, Peter J. Black, Sanjiv Nanda
  • Patent number: 8818445
    Abstract: A power control method for interference alignment in wireless network having K transmitters and K receivers is provided. The method includes: receiving, performed by receiver n (n is an integer, 1?n?K?1), a power indication signal of transmitter n+1 from the transmitter n+1; determining, performed by the receiver n, power of transmitter n; and transmitting, performed by the receiver n, a power indication signal of transmitter n to the transmitter n, wherein the power of transmitter n is determined based on a residual interference of the receiver n, and the power indication signal of transmitter n indicates a minimum transmission power or a maximum transmission power of transmitter n.
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: August 26, 2014
    Assignees: LG Electronics Inc., Industry-Academic Cooperation Foundation, Yonsei University
    Inventors: Han Byul Seo, Kaibin Huang, Soon Suk Roh, Sung Yoon Cho, Hyuk Jin Chae, Byoung Hoon Kim, Dong Ku Kim