Noise Or Interference Elimination Patents (Class 455/114.2)
  • Patent number: 8725218
    Abstract: Embodiments for at methods, apparatus and systems for operating a voltage regulator are disclosed. One method includes generating, by a switching controller, a switching voltage through controlled closing and opening of a series switch element and a shunt switch element. Further, the method includes generating, by a switchable output filter, a regulated output voltage by filtering the switching voltage, wherein the switchable output filter comprises a plurality of capacitors that are selectively included within the switchable output filter.
    Type: Grant
    Filed: February 18, 2012
    Date of Patent: May 13, 2014
    Assignee: R2 Semiconductor, Inc.
    Inventors: James E. C. Brown, Daniel Dobkin, Pablo Moreno Galbis, Cory Severson, Lawrence M. Burns
  • Publication number: 20140128012
    Abstract: Embodiments of the present invention provide a filter, a receiver, a transmitter, and a transceiver. The filter includes a resonant cavity component, a microstrip filtering component, and two connecting pieces, where the resonant cavity component includes at least two resonant cavities connected in parallel, each resonant cavity is provided with a resonator and a tuning screw, the microstrip filtering component includes a dielectric substrate and a microstrip positioned on the dielectric substrate, one of the connecting pieces matches and connects one end of the microstrip to the resonator on one resonant cavity, the other connecting piece matches and connects the other end of the microstrip to the resonator on another resonant cavity, and impedance of the resonant cavity component is less than impedance of the microstrip filtering component.
    Type: Application
    Filed: September 24, 2013
    Publication date: May 8, 2014
    Applicant: Huawei Technologies Co., Ltd.
    Inventor: Yanzhao Zhou
  • Patent number: 8717986
    Abstract: Provided is a data transmission system that may determine a multiple input multiple output dynamic spectrum management (MIMO-DSM) operation mode of a base station based on information associated with a data transmission route and a computational capability of each base station. A terminal may generate feedback information based on a cooperation level between base stations and may transmit the generated feedback information to a serving base station. The serving base station may select terminals that may receive data from among a plurality of terminals through a MIMO-DSM algorithm and a user scheduling based on the feedback information.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: May 6, 2014
    Assignees: Samsung Electronics Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Won Jong Noh, Yung Yi, Tae Soo Kwon, Soo Hwan Lee, Chang Yong Shin
  • Patent number: 8718577
    Abstract: According to techniques described herein LO leakage may be automatically minimized in a transmitter chain, even though the leakage may be varying in nature. In an embodiment a target signal for transmission is received. An offset for reducing the effects of the LO leakage is applied to the target signal. After the offset is applied, the target signal is converted to a transmission signal using the LO. A power associated with the transmission signal is determined. The offset is then adjusted based on the power associated with the transmission signal. In another embodiment, the offset signal is adjusted in a manner that minimizes the power associated with the transmission signal.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: May 6, 2014
    Assignee: Exalt Communications Incorporated
    Inventor: Peter Smidth
  • Patent number: 8719303
    Abstract: This invention proposed a new algorithm. By multiply the proposed weight coefficients of this invention, CSP and CSS can be computed without computing for the mean(s) of the data. After the proposed weight coefficients of this invention undergo factorization, it can promote a new recursive and real time updatable computation method. To test the accuracy of the new invention, the StRD data were separately tested using SAS ver 9.0, SPSS ver15.0 and EXCEL 2007 for comparison. The results showed that the accuracy of the results of the proposed invention exceeds the level of accuracy of SAS ver9.0, SPSS ver15.0 and EXCEL 2007. Aside from an accurate computation, this new invented algorithm can also produce efficient computations.
    Type: Grant
    Filed: December 24, 2008
    Date of Patent: May 6, 2014
    Inventors: Juei-Chao Chen, Kuo-Hung Lo, Tien-Lung Sun
  • Patent number: 8706064
    Abstract: A system and method improve amplifier efficiency of operation relative to that of an amplifying transistor with a fixed bias current. A power level representing a level of transmission power from an amplifier circuit and an indicator of amplifier circuit operation are provided. The indicator is at least one of channel, channel bandwidth, out-of band spectral requirements, spectral mask requirements, error vector magnitude, modulation rate, and modulation type. The amplifying transistor is biased with a bias current that is determined based at least in part on the power level and the indication where the bias current is different for channels at an edge of a channel band than for channels nearer a center of the channel band.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: April 22, 2014
    Assignee: SiGe Semiconductor, Inc.
    Inventors: Alan J. A. Trainor, Grant Darcy Poulin, Craig Joseph Christmas
  • Patent number: 8706060
    Abstract: In an example embodiment, there is disclosed an apparatus comprising a first transmitter, a second transmitter, and logic coupled to the first transmitter and the second transmitter. The logic is operable to limit a time period the second transmitter is able to transmit while the first transmitter is transmitting.
    Type: Grant
    Filed: May 6, 2009
    Date of Patent: April 22, 2014
    Assignee: Cisco Technology, Inc.
    Inventors: John Blosco, Stephen Joseph McCarthy, Corey Metsker
  • Patent number: 8706041
    Abstract: A wireless communication system and constituent wireless communication devices are provided to implement a distributed, cognitive radio approach to spectrum sharing. Under the distributed approach, individual wireless communication devices self-enforce negotiated agreements on usage of an available spectrum without intervention from a centralized authority. Particularly, individual wireless communication devices are configured to enhance information rates of their respective transmissions under predetermined constraints. The predetermined constraints can include transmit power constraints (e.g., a maximum power available to the wireless communication devices), or interference constraints (e.g., constraints on the amount, direction, and/or quality of interference generated by transmissions).
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: April 22, 2014
    Assignee: Dynamic Invention LLC
    Inventors: Daniel Perez Palomar, Gesualdo Scutari
  • Patent number: 8706128
    Abstract: The illustrative embodiments described herein are directed to a method and apparatus for managing frequencies used by devices. In one embodiment, the process detects a set of frequencies from a set of devices to form a set of assigned frequencies. The process may also detect a first frequency used by a first device. The process may determine whether the first frequency interferes with the set of assigned frequencies. The process may also identify an unassigned frequency for use by the first device in response to determining whether the first frequency interferes with the set of assigned frequencies.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: April 22, 2014
    Assignee: CenturyLink Intellectual Property LLC
    Inventors: Shekhar Gupta, Carl M. Coppage
  • Patent number: 8706061
    Abstract: A method and system mitigates receiver desensitization caused by a reverse inter-modulation distortion (IMD) signal generated by a power amplifier associated with one of at least two concurrently operating transmitters. A power amplifier controller (PAC) determines whether at least one power amplifier operating in a first operating state generates a reverse IMD signal that can substantially interfere with at least one receive channel due to a concurrent operation of at least two concurrently operating transmitters. In response to determining that at least one power amplifier generates the reverse IMD signal when in the first operating state, the PAC initiates a second operating state of the power amplifier to increase the linearity of the at least one power amplifier in order to reduce the reverse IMD signal. The PAC initiates the second operating state by adjusting parameters of the power amplifier.
    Type: Grant
    Filed: August 16, 2012
    Date of Patent: April 22, 2014
    Assignee: Motorola Mobility LLC
    Inventors: Armin W. Klomsdorf, Gregory R. Black, Ryan J. Goedken
  • Patent number: 8705404
    Abstract: A method for reducing inter-cell interference and a method for transmitting a signal by a collaborative MIMO scheme, in a communication system having a multi-cell environment are disclosed. An example of a method for transmitting, by a mobile station, precoding information in a collaborative MIMO communication system includes determining a precoding matrix set including precoding matrices of one more base stations including a serving base station, based on signal strength of the serving base station, and transmitting information about the precoding matrix set to the serving base station. A mobile station in an edge of a cell performs a collaborative MIMO mode or inter-cell interference mitigation mode using the information about the precoding matrix set collaboratively with neighboring base stations.
    Type: Grant
    Filed: November 1, 2011
    Date of Patent: April 22, 2014
    Assignee: LG Electronics Inc.
    Inventors: Jae Wan Kim, Wook Bong Lee, Su Nam Kim, Dong Guk Lim, Bin Chul Ihm
  • Publication number: 20140106690
    Abstract: Measures for interference reduction for an envelope branch type transmitter. Such measures may include determination of a target frequency span for reducing interference caused by an envelope branch type transmitter, and configuration of a differential delay between a signal branch and an envelope branch of the envelope branch type transmitter on the basis of the determined target frequency span.
    Type: Application
    Filed: October 8, 2013
    Publication date: April 17, 2014
    Applicant: Renesas Mobile Corporation
    Inventor: Markus NENTWIG
  • Patent number: 8699971
    Abstract: An apparatus for identifying a specific emitter in the presence of noise and/or interference is disclosed. The apparatus includes a sensor configured to sense radio frequency signal data, the signal data containing noise and signal from at least one emitter, a reference estimation unit configured to estimate a reference signal relating to the signal transmitted by one emitter, a feature estimation unit configured to generate one or more estimates of one or more feature from the reference signal and the signal transmitted by that particular emitter, and an emitter identifier configured to identify the signal transmitted by that particular emitter as belonging to a specific device using one or more feature estimates. The emitter identifier identifies the signal transmitted by that particular emitter as belonging to a specific device using Gaussian Mixture Models and the Bayesian decision engine.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: April 15, 2014
    Assignee: Rockwell Collins, Inc.
    Inventors: Shubha L. Kadambe, Jason A. Fuemmeler, Carlos J. Chavez, William S. Spencer, Gina M. Reyes, Robert J. Frank, Michael N. Newhouse
  • Patent number: 8693577
    Abstract: A receiver operatively coupled to an antenna structure capable of receiving a first plurality of RF signals is disclosed herein. The receiver includes an RF processing network operative to perform weighting and combining operations within the RF domain using the first plurality of RF signals so as to produce a second plurality of RF signals. Also provided is a downconverter configured to downconvert the second plurality of RF signals into a second plurality of down-converted signals. In alternate implementations certain of the weighting and combining operations are performed at baseband and the remainder effected within the RF domain. A transmitter of corresponding architecture is also disclosed.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: April 8, 2014
    Assignee: Broadcom Corporation
    Inventors: Severine Catreux, Vinko Erceg, Pieter Roux, Pieter Van Rooyen, Jack Winters
  • Patent number: 8693954
    Abstract: The invention is directed to a method for reducing the influence of an interfering signal Si on a wanted signal Sw in a first frequency channel n received by a receiver 112a? when the interfering signal Si occurs in a second frequency channel n+1 near to the first channel n. The method comprises the steps of: assuming a model S?of a transmitter 120b? causing the interfering signal Si; obtaining in the first channel n a measure of the wanted signal Sw and a measure of a nonlinear part of the interfering signal Si, and in the second channel n+1 a measure of a linear part of the interfering signal Si; solving the model for said transmitter 120b? by using the measured linear and nonlinear part; and obtaining the interfering signal Si; influencing the first channel n by using the solved model, and subtracting the obtained interfering signal S1 from the wanted signal Sw received by the receiver 112a?.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: April 8, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Ulf Mattsson
  • Patent number: 8693971
    Abstract: A receiver is configured to receive a receive signal including a plurality of signal components, each signal component indicating a channel of an antenna port and an associated scrambling sequence, wherein a first one of the channels indicated by a first one of the signal components which is based on a first scrambling sequence is allocated to the receiver for data reception and a second one of the channels indicated by a second one of the signal components which is based on a second scrambling sequence different from the first scrambling sequence is interfering with the allocated channel. The receiver includes an interference reduction unit configured to combine an estimate of the first one of the signal components and an estimate of the second one of the signal components to provide an interference-reduced signal.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: April 8, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Rajarajan Balraj, Biljana Badic, Tobias Scholand
  • Patent number: 8693961
    Abstract: In accordance with some embodiments of the present disclosure, a circuit comprises a balun configured to receive a radio frequency (RF) signal at a first input port and a second input port of an input coil. The balun is further configured to output the RF signal at an output coil communicatively coupled to the input coil. The circuit also comprises a supply voltage selector circuit coupled to the input coil and configured to adjust a bias voltage at the input coil according to a power level of the RF signal received at the input coil.
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: April 8, 2014
    Assignee: Intel IP Corporation
    Inventors: Omid Oliaei, David Newman, Mark Kirschenmann
  • Patent number: 8682263
    Abstract: A programmable-current transmit continuous-time filter (TX-CTF) system can be included in a radio frequency (RF) transmitter. The input of the TX-CTF can receive a baseband transmission signal, and the output of the TX-CTF can be provided to an upconversion mixer for conversion to RF for transmission. The TX-CTF includes amplifier circuitry and passive circuitry that together define the filter parameters. The TX-CTF further includes programmable current circuitry that provides a programmable bias current to the amplifier circuitry. The TX-CTF system also includes control logic that receives one or more transmitter control signals and, in response, generates signals that control the bias current provided to the TX-CTF.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: March 25, 2014
    Assignee: Skyworks Solutions, Inc.
    Inventors: Sandeep D'Souza, Bipul Agarwal
  • Patent number: 8682250
    Abstract: A noise cancellation system for an audio system such as a mobile phone handset, or a wireless phone headset has a first input for receiving a first audio signal from one or more microphone positioned to receive ambient noise, and a second input for receiving a second audio signal from a microphone positioned to detect the user's speech, as well as a third input for receiving a third audio signal for example representing the speech of a person to whom the user is talking. A first noise cancellation block receives the first audio signal and generates a first noise cancellation signal, and this is combined with the third audio signal to form a first audio output signal. A second noise cancellation block receives at least a part of the first audio signal and said second audio signal and applying noise cancellation to generate a second audio output signal.
    Type: Grant
    Filed: June 24, 2009
    Date of Patent: March 25, 2014
    Assignee: Wolfson Microelectronics plc
    Inventors: Anthony James Magrath, Clive Robert Graham
  • Patent number: 8682268
    Abstract: The present invention relates to a method of suppressing noise in a communication device. The idea consists in forwarding to a noise suppression module some information regarding the radio transmission in terms of radio activity and/or in terms of radio transmission power. The module then advantageously uses this information to suppress radio path noise.
    Type: Grant
    Filed: April 14, 2010
    Date of Patent: March 25, 2014
    Assignee: Ericsson Modems SA
    Inventor: Lionel Cimaz
  • Patent number: 8682264
    Abstract: According to one embodiment, a digital-to-analog converter includes a plurality of cells. Each cell includes a current source and a differential switch. The current source includes a first transistor arranged in a first region and connected to either a power source or a ground, a second transistor arranged in a second region which is different from the first region and connected directly or indirectly with the first transistor in a cascode configuration, and a metallic interconnect connecting the first region and the second region electrically. The differential switch includes a pair of transistors, each connected to the second transistor and arranged in the second region.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: March 25, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Daisuke Kurose
  • Patent number: 8682246
    Abstract: Methods and systems for collaborative coexistence of Bluetooth and WiMax are disclosed. Aspects of one method may include a packet traffic arbiter (PTA) in a mobile terminal that arbitrates among requests to transmit from one or more communication devices collocated in the mobile terminal. The communication devices may comprise, for example, a WLAN communication device, a WiMax communication device, and/or a Bluetooth communication device. The arbitration may be based on, for example, whether a packet will be received by one of the plurality of collocated communication devices at a time of transmission of the present data packet and/or a priority for data to be transmitted. An exemplary scenario may be where a Bluetooth headset may be used for communication over a WiMax voice connection. One arbitration method may comprise allowing the WiMax packet to be transmitted, and replacing the received Bluetooth packet with data indicating silence.
    Type: Grant
    Filed: August 27, 2007
    Date of Patent: March 25, 2014
    Assignee: Broadcom Corporation
    Inventors: Prasanna Desai, Steven Deane Hall, Brima Ibrahim
  • Publication number: 20140080432
    Abstract: An electronic device includes an adjustable filter with a first filter element, and a second filter element coupled to the first filter element. The second filter element includes a field effect transistor (FET) including a source terminal, a drain terminal, and a gate terminal. The source terminal and the gate terminal are coupled to a reference voltage. A control circuit is coupled to the drain terminal and is configured to apply a control voltage thereto to vary a capacitance between the source and drain terminals to adjust the adjustable filter.
    Type: Application
    Filed: November 19, 2013
    Publication date: March 20, 2014
    Inventors: ANDREW MUI, ANTHONY C. MANICONE
  • Patent number: 8676252
    Abstract: A method for dual mode mobile terminal in an MIMO wireless communication system is disclosed. The present invention includes the steps of if an uplink transmission mode is for simultaneous transmission to an LTE base station and a CDMA base station, determining whether a transmission power to the LTE base station is equal to or greater than a threshold value, transmitting a simultaneous transmission mode dedicated scheduling request signal for excluding a risky frequency band from an uplink band to the LTE base station, receiving a scheduling information on the uplink band except the risky frequency band from the LTE base station, transmitting a CS service signal to the CDMA base station, and transmitting a PS service signal to the LTE base station using the scheduling information.
    Type: Grant
    Filed: August 2, 2011
    Date of Patent: March 18, 2014
    Assignee: LG Electronics Inc.
    Inventors: Seungpyo Noh, Sangjo Park, Jaehyuk Jang, Yongsang Cho
  • Patent number: 8675520
    Abstract: The invention provides a method of operating a first base station (100) as a reception station for a wireless uplink communication connection with a wireless appliance (102), wherein the method comprises: controlling the wireless uplink communication with the wireless appliance, receiving a signal (127) from the wireless appliance, receiving a rest signal (126) from at least one second base station (104), and analyzing the rest signal from the at least one second base station for detecting a signal (129) from the wireless appliance that is above a threshold.
    Type: Grant
    Filed: April 15, 2010
    Date of Patent: March 18, 2014
    Assignee: Alcatel Lucent
    Inventors: Osman Aydin, Stephen Kaminski
  • Patent number: 8676127
    Abstract: Methods for enabling provision of data to be used in a performance analysis are provided. The communication device obtains an input to set up at least one rule within the communication device to be fulfilled in order to create at least one performance management counter to count occurrences of a performance management parameter related to the communication device. The communication device sets up the at least one rule and detects an impulse. The communication device determines if the at least one rule has been fulfilled. The communication device monitors data associated to the communication device if the at least one rule has been fulfilled, and creates the at least one performance management counter to count occurrences of the at least one performance management parameter based on the monitored data. A message including a result of the at least one performance management counter is transmitted to another device.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: March 18, 2014
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Per-Daniel Stalnacke, Peter Rehnberg
  • Patent number: 8670719
    Abstract: A method for communication includes receiving at a receiver from a group of two or more transmitters multiple Radio Frequency (RF) transmission beams that alternate in time and space and include at least first and second transmission beams. The method identifies that the first transmission beam causes interference to reception of the second transmission beam. Feedback is sent from the receiver to one or more of the transmitters, so as to cause the transmitters to attenuate the first transmission beam during transmission of the second transmission beam.
    Type: Grant
    Filed: September 17, 2013
    Date of Patent: March 11, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Itsik Bergel, Shlomo Shamai, Daniel Yellin, Yona Perets
  • Patent number: 8670729
    Abstract: Methods and systems for level detector calibration are disclosed and may comprise calibrating a level detector integrated on-chip to eliminate an associated zero input offset voltage utilizing a replica bias circuit with no input ac voltage at the level detector or the replica bias circuit. The offset voltages of the level detector and the replica bias circuit may be combined to eliminate the associated zero input offset voltage of the level detector. The output signal may be generated by a difference of output signals from the level detector and the replica bias circuit. The level detector and the replica bias circuit may be biased utilizing a similar bias voltage. A plurality of known input voltages may be utilized to generate a corresponding plurality of output voltages of the level detector, generating a corrected transfer function that may be used to accurately set a transmitter power level.
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: March 11, 2014
    Assignee: Broadcom Corporation
    Inventor: Arya Behzad
  • Patent number: 8666323
    Abstract: Provided are an RFID reader and a method for suppressing transmission leakage signals thereof. The RFID reader includes a first loop, a second loop, and a digital signal processor. The first loop suppresses a first transmission leakage signal of an RX signal in response to a first leakage control signal. The second loop suppresses a second transmission leakage signal of the RX signal, received through the first loop, in response to a second leakage control signal. The digital signal processor generates the first leakage control signal and the second leakage control signal. The digital signal processor generates the first leakage control signal until the level of the first transmission leakage signal becomes equal to or lower than the level of a first reference transmission leakage signal.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: March 4, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Donghan Lee, Sang Gee Kang, Kwang-Soo Cho, Man Sik Park, Chan-Won Park, Cheng-Hao Quan, Ji-Hoon Bae, Gil Young Choi, Jong-Suk Chae
  • Patent number: 8660503
    Abstract: Embodiments provide a transmitter and a method for transmitting data via a combination of a first signal modulated at a first carrier frequency, and a second signal modulated at a second carrier frequency, different to the first carrier frequency. In one embodiment the transmitter includes a local oscillator and is configured to adaptively configure the local oscillator to operate at a first local oscillator frequency and an alternative local oscillator frequency, different to the first frequency, in dependence on a required signal strength of the first signal relative to a required signal strength of the second signal.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: February 25, 2014
    Assignee: Broadcom Corporation
    Inventors: Jouni Kristian Kaukovuori, Petri Tapani Eloranta, Risto Kaunisto, Aarno Tapio Pärssinen, Antti Oskari Immonen
  • Patent number: 8649743
    Abstract: A transmitter (50) includes a nonlinear predistorter (58) having two instances of an inverting transform (106, 106?) that may be implemented in a look-up table (122) and that implements a transform which is the inverse of an average terms component (96) of a nonlinear transform model (94) for an amplifier (70). The look-up table (122) may be updated using a continuous process control loop that avoids Cartesian to polar coordinate conversions. One of the two instances of the inverting transform (106) is cascaded with a non-inversing transform (108) within a residual cancellation section (110) of the predistorter (58). The non-inversing transform (108) implements a transform which is an estimate of a deviation terms component (98) of the nonlinear transform model (94). The residual cancellation section (110) produces a weak signal that replaces an unwanted residual term in an amplified communication signal (76) with a much weaker residual term.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: February 11, 2014
    Assignee: CrestCom, Inc.
    Inventors: Ronald Duane McCallister, Eric M. Brombaugh
  • Patent number: 8649729
    Abstract: A system and method are provided for transmitting a broadband interference signal and allowing communication through the transmitted interference signal. The system includes an interference transmitter for transmitting the interference signal, the interference transmitter having a transmitter feeder and a first antenna; a radio receiver for receiving a radio signal, the radio receiver having a radio feeder and a second antenna collocated with the first antenna of the interference transmitter; a steering signal generator for introducing at least one steering signal into the interference signal at the transmit feeder; a first directional coupler for sampling a portion of the interference signal that includes at least one of the steering signals; a negative feedback loop for adjusting the amplitude and phase of the sampled portion of the interference signal; and a second directional coupler for coupling the adjusted sampled portion of the interference signal into the radio feeder.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: February 11, 2014
    Assignee: Cobham CTS Limited
    Inventors: Stephen James Nightingale, George John Woloszczuk
  • Patent number: 8644865
    Abstract: A method of measuring interference to perform efficient data communication is disclosed. A method of measuring interference of neighboring cells comprises allocating one or more first resource elements, to which pilot signals are allocated, to predetermined symbol regions included in a first resource block; allocating one or more second resource elements for measuring interference of the neighboring cells to a first symbol region of the predetermined symbol regions; and measuring interference of the neighboring cells using the one or more second resource elements.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: February 4, 2014
    Assignee: LG Electronics Inc.
    Inventors: Jae Hoon Chung, Hyun Soo Ko, Moon Il Lee, Bin Chul Ihm
  • Patent number: 8639185
    Abstract: A communication system includes a transmitter that applies an electric field, obtained by modulating an information signal for wideband communication, to a transmission medium. The transmitter includes a transmission electrode, a transmission circuit that outputs the information signal for the wideband communication, and a first band controller that controls a band of the information signal for the wideband communication. When the transmission medium is in contact with the transmission electrode and the transmission medium and the transmission electrode are capacitively coupled to each other, the first band controller performs control to provide a band that is necessary for a receiver to perform demodulation for the wideband communication, and when the transmission medium is not in contact with the transmission electrode, the first band controller performs control to provide a narrower band than the band that is necessary for the wideband communication.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: January 28, 2014
    Assignee: Alps Electric Co., Ltd.
    Inventors: Hiroyuki Hebiguchi, Shigetoshi Matsuta, Masaru Koishi, Hideyuki Nebiya
  • Patent number: 8639189
    Abstract: When a device in one wireless network receives interfering transmissions from an overlapping neighboring network, the neighboring network may be notified of the interference so that non-interfering schedules can be worked out. In one embodiment, the device receiving the interference may broadcast its own communications schedule. Device(s) in the interfering network may pick up that schedule, and pass it on to their controller, which can rearrange its own network schedule to be non-interfering. In another embodiment, the device receiving the interference may notify its own network controller with the pertinent information, and that controller may contact the controller of the interfering network to coordinate non-interfering schedules.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: January 28, 2014
    Assignee: Intel Corporation
    Inventors: Carlos Cordeiro, Praveen Gopalakrishnan, Guoqing C. Li
  • Patent number: 8639197
    Abstract: According to one exemplary embodiment, a method of preventing harmonics from causing distortion in a communications system includes feeding a test signal through a pre-distortion circuit in the communications system to a transmitter in the communications system. The method continues by transmitting a distorted output signal produced by the transmitter to an analyzer, analyzing the distorted output signal to identify one or more undesired harmonics, and generating and sending calibration data from the analyzer to calibrate the pre-distortion circuit, thereby preventing the one or more undesired harmonics from causing distortion in the communications system. In one embodiment, a system to prevent harmonics from causing distortion in a communications system includes a pre-distortion circuit, a transmitter, and an analyzer configured to identify one or more undesired harmonics and to generate and send calibration data to prevent the undesired harmonics from causing distortion.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: January 28, 2014
    Assignee: Broadcom Corporation
    Inventor: Meng-An Pan
  • Patent number: 8639996
    Abstract: Systems, methods, apparatus, devices and computer program products enhance uplink inter-cell interference cancellation with HARQ retransmissions. The decoding of a data packet depends on whether the interfering packet was decoded. Since the interfering packet is itself transmitted using a HARQ process, the transmission by the victim UT can be accomplished to take this situation into account. The latency of the victim UT can be varied based on the need for energy efficient transmission. In accordance with one specific aspect, if the receiver can decode multiple packets simultaneously, high data rates can be achieved using packet pipelining.
    Type: Grant
    Filed: May 7, 2009
    Date of Patent: January 28, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Petru C. Budianu, Ravi Palanki
  • Patent number: 8634792
    Abstract: An RF receiver section includes an adjustable antenna assembly, a low noise amplifier module, and a down conversion module. The adjustable antenna assembly is configured to provide a first receive antenna structure and a second receive antenna structure. The first and second receive antenna structures receive an inbound wide bandwidth RF signal that includes an interferer RF signal component and a desired inbound RF signal component. The effective polarization of at least one of the first and second receive antenna structures is adjusted to reduce signal strength of the interferer RF signal component.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: January 21, 2014
    Assignee: Broadcom Corporation
    Inventors: Ahmadreza (Reza) Rofougaran, Maryam Rofougaran
  • Patent number: 8634783
    Abstract: A communication device includes memory, an input interface, a processing module, and a transmitter. The processing module receives a digital signal from the input interface, wherein the digital signal includes a desired digital signal component and an undesired digital signal component. The processing module identifies one of a plurality of codebooks based on the undesired digital signal component. The processing module then identifies a codebook entry from the one of the plurality of codebooks based on the desired digital signal component to produce a selected codebook entry. The processing module then generates a coded signal based on the selected codebook entry, wherein the coded signal includes a substantially unattenuated representation of the desired digital signal component and an attenuated representation of the undesired digital signal component. The transmitter converts the coded signal into an outbound signal in accordance with a signaling protocol and transmits it.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: January 21, 2014
    Assignee: Broadcom Corporation
    Inventor: Nambirajan Seshadri
  • Patent number: 8630369
    Abstract: An emphasis circuit includes: an applying circuit to add an emphasis signal to an input differential signal; a feedback path to feed back a differential output of the applying unit; a comparing circuit to compare a direct current component level of a positive phase signal and of a negative phase signal of the differential signal; a direct current component level controlling circuit to control a direct current component level of at least one of the positive phase signal and the negative phase signal; a delay unit circuit to add a delay to at least one of the fed-backed differential signal to generate the emphasis signal and inputs the emphasis signal into the applying unit; and a dummy load coupled to a positive phase signal output or a negative phase signal output of the applying unit.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: January 14, 2014
    Assignee: Fujitsu Limited
    Inventor: Yukito Tsunoda
  • Patent number: 8626090
    Abstract: A radio frequency transmitter comprises an amplifier, an antenna port, an isolator adapted to isolate an output of the amplifier from an interfering signal of the antenna port, a linearization loop and a transmission line comprising a first part (coupling a signal source to an input of the amplifier), a second part (coupling the output of the amplifier to an input of the isolator) and a third part (coupling an output of the isolator to the antenna port). The linearization loop is adapted to reduce non-linearity of the isolator and comprises a first directional coupler coupled to the third part of the transmission line, a loop impedance, and at least one further linearization loop element adapted to adjust a linearization signal and to feed the adjusted linearization signal to the transmission line. The radio frequency transmitter also comprises an interference reducing circuit adapted to reduce an influence of the interfering signal on the linearization loop.
    Type: Grant
    Filed: March 23, 2010
    Date of Patent: January 7, 2014
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Spendim Dalipi
  • Patent number: 8626069
    Abstract: An apparatus and method for beamforming in a broadband wireless communication are provided. The apparatus includes a first calculator for determining a degradation factor to indicate a degradation degree of a target signal due to interference cancellation by using a target channel matrix and at least one interfering channel matrix, a second calculator for determining a new noise power value to be used to calculate a beamforming vector if the degradation factor is greater than or equal to a threshold, and for determining the beamforming vector by using the new noise power value, and a beamformer for performing beamforming on a signal transmitted/received with a target Mobile Station (MS) by using the beamforming vector.
    Type: Grant
    Filed: April 17, 2009
    Date of Patent: January 7, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Heon-Ki Chae, Keun-Chul Hwang, Soon-Young Yoon
  • Publication number: 20140004809
    Abstract: Provided is a frequency mixer including: an oscillator configured to output an LO signal; a first converter configured to convert an input IF signal into different first and second IF signals; a first mixer configured to output a first RF signal in which the first IF signal is mixed with the LO signal and a first leakage signal; a second mixer configured to output a second RF signal in which the second IF signal is mixed with the LO signal and a second leakage signal; and a second converter configured to mix and attenuate the first and second leakage signals and output an RF signal in which the first and second RF signals are mixed, in order to minimize leakage power of an LO signal generated in a local oscillator in a transmitter for a communication system using a high frequency of 70 GHz or higher, such as an E-band.
    Type: Application
    Filed: March 11, 2013
    Publication date: January 2, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Jin Cheol JEONG, Dong Pil CHANG, In Bok YOM
  • Patent number: 8620232
    Abstract: The present document discloses a method and system for improving echo cancellation in the presence of non-linear distortions. A circuit attenuates a transmit signal in one or more spectral bands based on a receive signal. The distorted echo comprised within the transmit signal results from distortions incurred by the receive signal when being rendered by an electronic device. The circuit compares energy values of the receive signal in multiple spectral bands with multiple corresponding spectral band dependent distortion thresholds and determines that for a first spectral band from multiple spectral bands. A first energy value from multiple energy values exceeding a first distortion threshold from multiple distortion thresholds attenuates the transmit signal in one or more spectral bands at higher frequencies than the first spectral band with corresponding spectral band dependent attenuation factors.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: December 31, 2013
    Assignee: Dialog Semiconductor B.V.
    Inventor: Michiel Andre Helsloot
  • Patent number: 8620240
    Abstract: An aspect of a power amplifier according to the present invention is a power amplifier that amplifies a modulated signal including amplitude modulated components and phase modulated components, the power amplifier including a first voltage source 21 that amplifies low-frequency components of the amplitude modulated components of the modulated signal to output a first voltage VC_L, a second voltage source 22 that amplifies high-frequency components of the amplitude modulated components of the modulated signal to output a second voltage VC_H, a current source 24 that amplifies amplitude components of the modulated signal to output a current, a combiner circuit 23 that combines the first voltage VC_L, the second voltage VC_H, and a current IM to generate a modulated power supply signal VOUT, and an RF amplifier 30 that amplifies a signal obtained by up-converting the modulated signal to a carrier frequency and outputs the amplified signal after modulating amplitude of the amplified signal by the modulated power
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: December 31, 2013
    Assignee: NEC Corporation
    Inventors: Shingo Yamanouchi, Kazuaki Kunihiro, Kazumi Shiikuma
  • Patent number: 8620221
    Abstract: A base station device (10) communicates between a first terminal device and a second terminal device over the same channel by spatial multiplexing. The base station device (10) comprises an interference cancellation coefficient extractor (30) that extracts an interference cancellation coefficient from a signal received from the first terminal device to cancel interference on a propagation channel with the first terminal device in advance, and transmits a pilot signal that contains information related to the interference cancellation coefficient to the second terminal device.
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: December 31, 2013
    Assignee: Panasonic Corporation
    Inventors: Takaaki Kishigami, Shozo Okasaka
  • Patent number: 8620231
    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: September 5, 2012
    Date of Patent: December 31, 2013
    Assignee: BlackBerry Limited
    Inventors: Lizhong Zhu, George Soliman Mankaruse, Michael Stephen Corrigan
  • Patent number: 8619847
    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: November 24, 2006
    Date of Patent: December 31, 2013
    Assignee: Altera Corporation
    Inventor: Kiomars Anvari
  • Publication number: 20130344826
    Abstract: An adjustable filter is responsive to a control signal to change a frequency response of the adjustable filter based on frequency spectrum information. The control signal may shift a center of the pass band from a first center frequency to a second center frequency and/or change a pass band bandwidth from a first bandwidth to a second bandwidth. In one example, the frequency spectrum information includes a status of an internal secondary radio. The frequency spectrum information may also indicate a region of operation where the frequency response is selected in accordance with the region.
    Type: Application
    Filed: August 26, 2013
    Publication date: December 26, 2013
    Applicant: QUALCOMM Incorporated
    Inventors: Amol Rajkotia, Samir Salib Soliman, Stanley Slavko Toncich
  • Patent number: 8615200
    Abstract: A method for improving channel estimation in a wireless communication system is disclosed. A wireless signal that includes a plurality of multipath components is received. N channel estimates are then obtained, where N is any positive integer greater than one. Each channel estimate of the N channel estimates corresponds to a different multipath component of the plurality of multipath components. The effects of interference between the plurality of multipath components on the N channel estimates is then reduced.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: December 24, 2013
    Assignee: Qualcomm Incorporated
    Inventors: Durga Prasad Malladi, Josef J. Blanz, Yongbin Wei