Noise Or Interference Elimination Patents (Class 455/114.2)
  • Patent number: 10419077
    Abstract: The present disclosure describes techniques and systems for wireless communication via a mobile relay. These techniques may include a user device that determines that a transceiver is unavailable for communicating with a base station via a wireless connection. The user device then uses a mobile relay to communicate with the base station while the transceiver is unavailable. The mobile relay may be used for transmitting or receiving data from the base station. Additionally or alternatively, the mobile relay may participate in the wireless connection as an external resource of the mobile device or may establish an independent wireless connection with the base station.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: September 17, 2019
    Assignee: Google LLC
    Inventors: Jibing Wang, Erik Richard Stauffer, Aamir Akram
  • Patent number: 10374652
    Abstract: Aspects disclosed in the detailed description include antenna switching for a communication circuit. A communication circuit includes an antenna switching circuit that couples the communication circuit to a first antenna and/or a second antenna for radio frequency (RF) signal transmission and reception. The antenna switching circuit is configured to include fewer antenna switches compared to a conventional antenna switching circuit to reduce the cost and footprint of the communication circuit. Furthermore, by reducing the number of antenna switches in the antenna switching circuit, it is possible to improve RF isolation between the first antenna and the second antenna, thus leading to improved RF performance of the communication circuit.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: August 6, 2019
    Assignee: Qorvo US, Inc.
    Inventor: Nadim Khlat
  • Patent number: 10355745
    Abstract: In accordance with one or more embodiments, a transmission device includes a receiver configured to receive an interfering signal via an antenna. A controller is configured to select a subset of a plurality of guided electromagnetic wave resource blocks, based on the interfering signal, to mitigate an interference with a distributed antenna system. A transmitter is configured to generate electromagnetic signals conveying data, in accordance with the subset of the plurality of guided electromagnetic wave resource blocks. A coupler is configured to generate guided electromagnetic waves in response to the electromagnetic signals, wherein the guided electromagnetic waves propagate, without requiring an electrical return path, along a surface of a transmission medium of a distributed antenna system.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: July 16, 2019
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Paul Shala Henry, Giovanni Vannucci, Thomas M. Willis, III
  • Patent number: 10299223
    Abstract: A method is provided in one example embodiment and may include negotiating power domain interference coordination (PDIC) parameters between a macro cell radio and at least one small cell radio; determining successive interference cancellation (SIC) parameters for each of one or more user equipment (UE) that are to perform SIC for one or more transmissions; and sending the SIC parameters to each of the one or more user equipment. Negotiating PDIC parameters can include determining, by the macro cell radio and at least one small cell radio, one or more physical resource blocks (PRBs) for which transmission power levels can be coordinated for a plurality of frequencies in a frequency domain and a plurality of subframes in a time domain and exchanging PDIC parameters between the cell radios in order to perform PDIC transmissions for UE served by the cell radios.
    Type: Grant
    Filed: October 18, 2016
    Date of Patent: May 21, 2019
    Assignee: Cisco Technology, Inc.
    Inventor: Vivek Jha
  • Patent number: 10298068
    Abstract: The present disclosure is to provide a power wireless transmitter in a magnetic resonance-based wireless power transmission system, wherein when, due to a presence of a metal, an output from the wireless power transmitter has a change in a resonance frequency thereof, a drive frequency and/or duty ratio with a maximum output therefrom are determined to be applied for a transmission from the wireless power transmitter, thereby to achieve an efficient wireless power transmission.
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: May 21, 2019
    Assignee: POWER REPUBLIC CORP.
    Inventors: Yeonmi Oh, Changuk Choi
  • Patent number: 10257733
    Abstract: A method and apparatus configures a wireless network comprising a plurality of nodes to mitigate effects of an external interference source. A subset of the nodes simultaneously participate in an external interference sampling process in which each node of the subset samples signals received by an antenna array of that node. A measurement report, comprising a signal source angle and a received signal strength, is received from a node. A location of the external interference source is estimated using the measurement report. The external interference source is then characterized using the estimated location of the external interference source and the received signal strength to calculate for the external interference source at least one of: a source power; a beam width; an antenna bearing; and a front-to-back transmission ratio. The nodes are configured to mitigate effects of the external interference source in dependence on a result of the characterizing step.
    Type: Grant
    Filed: June 20, 2016
    Date of Patent: April 9, 2019
    Assignee: AIRSPAN NETWORKS INC.
    Inventors: Martin Lysejko, Andrew Logothetis
  • Patent number: 10200993
    Abstract: Techniques are described for wireless communication at a wireless communication device. One method includes determining an availability of a sub-band of a shared radio frequency spectrum band during a first portion of a distributed channel availability check (CAC); receiving at least one indication that the sub-band is available during remaining portions of the distributed CAC; and communicating over the sub-band based at least in part on determining the sub-band is available during the first portion of the distributed CAC and the at least one indication that the sub-band is available during remaining portions of the distributed CAC.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: February 5, 2019
    Assignee: QUALCOMM Incorporated
    Inventor: Michael Richard Green
  • Patent number: 10187091
    Abstract: An electronic device is provided. The electronic device includes a first communication circuit configured to perform wireless communication with an external electronic device, based on a first communication protocol in which the wireless communication is possible based on at least one of a first frequency or a second frequency, a processor electrically connected to the communication circuit, and a memory electrically connected to the processor. The memory is configured to store instructions, the instructions, when executed, causing the processor to acquire information associated with at least one of a state or an operation of the electronic device and the first communication to perform the wireless communication selectively based on one of the first frequency or the second frequency, based on at least a part of the acquired information.
    Type: Grant
    Filed: December 3, 2015
    Date of Patent: January 22, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hee Tae Kim, Bong Su Chun
  • Patent number: 10136341
    Abstract: A computer implemented method includes transmitting a transmit command to a first data concentrator to send out a predetermined signal of predetermined characteristics according to a transmission setting, receiving a received signal from at least one second data concentrator, and determining if there are any signal transmission effects between the first data concentrator and the second data concentrator based on a comparison of the predetermined signal and the received signal.
    Type: Grant
    Filed: January 3, 2017
    Date of Patent: November 20, 2018
    Assignee: Simmonds Precision Products, Inc.
    Inventors: Christopher Fitzhugh, Michael A. Lynch
  • Patent number: 10079703
    Abstract: Various embodiments associated with use of an echo signal are described. A plurality of sensors can be deployed to obtain editions of a signal of interest. The signal of interest may be so far away from the sensors that the editions collected are too noisy to be analyzed. A processing center can send an echo signal to the sensors and the sensors can respond to the processing center with a signal edition of the signal of interest and the echo signal. Since the processing center knows information about the echo signal, offsets among the sensors can be calculated based on the returned echo signals. These offsets can then be used to align the signal editions. At the processing center, the aligned signal editions can be combined into a combined signal and a demodulation scheme for the combined signal can be determined and then used for demodulation of the signal.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: September 18, 2018
    Assignee: The United States of America, as represented by the Secretary of the Army
    Inventor: Wei Su
  • Patent number: 9992315
    Abstract: Disclosed are a terminal and a terminal multiple protection method. The radiation processing module is configured to convert after preprocessing a first signal received from the external into a second signal that can be recognized by a baseband chip of a terminal. A radiation diagnosis module is configured to extract signal characteristics expressed by the second signal, to classify signals via comparison of signal characteristics, to diagnose to acquire a signal type to which the second signal pertains, and to output the second signal to a radiation protection control module for executing a relevant protection process for the corresponding signal type. The radiation protection module is configured to acquire the second signal and the corresponding signal type thereof and to selectively execute a relevant protection control process among multiple protection processes on the basis of the corresponding signal type.
    Type: Grant
    Filed: April 1, 2015
    Date of Patent: June 5, 2018
    Assignee: ZTE Corporation
    Inventor: Shaowu Shen
  • Patent number: 9953628
    Abstract: A microphone device including a first sound receiving module and a second sound receiving module is provided. The first sound receiving module includes a first output terminal and receives a sound signal to output a first electronic signal through the first output terminal. The second sound receiving module, which disposed adjacent to the first sound receiving module to receive the sound signal, includes a second output terminal and outputs a second electronic signal through the second output terminal accordingly. The first output terminal of the first sound receiving module is coupled to the second output terminal of the second sound receiving module, and the phase of the first electronic signal and the phase of the second electronic signal are inverse to each other.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: April 24, 2018
    Assignee: Merry EIectronics (Shenzhen) Co., Ltd.
    Inventor: Chia-Chung Lin
  • Patent number: 9954582
    Abstract: A power transmitting apparatus that performs power transmission to a power receiving apparatus includes an amplifier including a switching element, receives a load power amount from the power receiving apparatus, detects a value for evaluating the efficiency of the amplifier, and based on the load power amount and the detected value for evaluating the efficiency, increases or reduces a voltage that is to be supplied to the amplifier.
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: April 24, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takahiro Shichino, Tadashi Eguchi
  • Patent number: 9906194
    Abstract: An exemplary system comprises a linearizer module, a first upconverter module, a power amplifier module, a signal sampler module, and a downconverter module. The linearizer module may be configured to receive a first intermediate frequency signal and to adjust the first intermediate frequency signal based on a reference signal and a signal based on a second intermediate frequency signal. The first upconverter module may be configured to receive and up-convert a signal based on the adjusted first intermediate frequency signal to a radio frequency signal. The power amplifier module may be configured to receive and amplify a power of a signal based on the radio frequency signal. The signal sampler module may be configured to sample a signal based on the amplified radio frequency signal. The downconverter module may be configured to receive and down-convert a signal based on the sampled radio frequency signal to the second intermediate frequency signal.
    Type: Grant
    Filed: May 17, 2016
    Date of Patent: February 27, 2018
    Assignee: Aviat U.S., Inc.
    Inventors: Frank Matsumoto, Youming Qin, David C. M. Pham, Jayesh Nath, Ying Shen
  • Patent number: 9848342
    Abstract: Methods, apparatuses, and systems that compensate for communication excursions in multipath communication systems (e.g. MIMO communication systems) while satisfying performance requirements parameters of the communication system. A plurality of communication signals may be received in a transmitter. The plurality of communication signals may be precoded (e.g. mixed) into a plurality of precoded communication signals. Excursions in the precoded communication signals may be scaled to generate a plurality of excursion compensated precoded communication signals. The scaling may be based on performance requirements parameters of a communication system and based on parameters of the precoding the plurality of communication signals. The plurality of excursion compensated precoded communication signals may then be amplified by a plurality of amplifiers.
    Type: Grant
    Filed: November 18, 2016
    Date of Patent: December 19, 2017
    Assignee: CCIP, LLC
    Inventor: Ronald Duane McCallister
  • Patent number: 9768892
    Abstract: In an embodiment, a method for measuring passive intermodulation (PIM) associated with a device under test (DUT) includes generating a test signal using a measuring instrument and obtaining measurements of PIM for the DUT. The test signal comprises two or more tones each amplified to a target output power by a respective amplifier according to a duty cycle. Measurements are obtained by the measuring instrument during an active portion of each duty cycle over a sweep of frequencies. PIM is calculated for the DUT by averaging a plurality of measurements obtained for each frequency from the sweep of frequencies. The duty cycle is determined based on the target output power.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: September 19, 2017
    Assignee: ANRITSU COMPANY
    Inventor: Donald Anthony Bradley
  • Patent number: 9756422
    Abstract: A mobile device uses externals microphone signals to improve the estimate of background noise that it computes. In order to improve voice quality in a first signal that is produced by an internal microphone, the mobile device identifies an external microphone device within proximity of the mobile device. The mobile device establishes a wireless connection with the external microphone device. The mobile device receives a second signal from the external microphone device through the wireless connection. The second signal is produced by a microphone of the external microphone device. The mobile device generates a noise profile based on the second signal, and then suppresses background/ambient noise from the first signal based on the noise profile. Other embodiments are also described.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: September 5, 2017
    Assignee: APPLE INC.
    Inventors: Baptiste P. Paquier, Bryan J. James, Aram M. Llndahl
  • Patent number: 9743361
    Abstract: A network access method, device, and system. The method includes: detecting, by a mobile wireless interconnection device, whether interference exists between a first channel and a second channel, where the first channel is between the mobile wireless interconnection device and a station, and the second channel is between the mobile wireless interconnection device and a hotspot access device; if interference exists, reducing, by the mobile wireless interconnection device, its own transmit power, so that no interference exists between the first channel and the second channel, and the station accesses the Internet by using the mobile wireless fidelity device and the hotspot access device.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: August 22, 2017
    Assignee: Huawei Device Co., Ltd.
    Inventors: Chao Xiang, Hongfei Tian
  • Patent number: 9692529
    Abstract: A system, method and computer program product for signal emitter identification using Higher-Order Cumulants (HOC) is presented. At least one transient signal is received from an emitter when the emitter turns on. The at least one transient signal is processed using at least one Higher-Order Cumulant (HOC) to provide a set of entries for a vector table. A feature vector is derived from the vector table, the feature vector identifying the emitter. The feature vector is used to identify an emitter.
    Type: Grant
    Filed: August 16, 2016
    Date of Patent: June 27, 2017
    Assignee: SOUTHWEST RESEARCH INSTITUTE
    Inventors: Wayne D. Music, Ryan N. Wilson, Brian K. Anderson
  • Patent number: 9596541
    Abstract: A method and system for improving echo suppression and/or duplexity of handsfree telephone applications is presented. An echo suppression unit for an electronic device comprising a loudspeaker and a microphone is described. The microphone is configured to capture a transmit signal, wherein the transmit signal comprises an echo of a receive signal rendered by the loudspeaker. The echo suppression unit is configured to determine, based on the receive signal, whether the receive signal comprises a first frequency component causing the echo of the receive signal to comprise a distortion component. The distortion component comprises one or more frequencies which are not comprised within the first frequency component. Furthermore, the echo suppression unit is configured to apply a post-filter to the transmit signal, if it is determined that the receive signal comprises the first frequency component. The post-filter is configured to selectively attenuate the distortion component.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: March 14, 2017
    Assignee: Dialog Semiconductor B.V.
    Inventors: Michiel Helsloot, Georgios Flamis, Gavin Radolan
  • Patent number: 9543991
    Abstract: Compression of an input signal prior to high power radio frequency (RF) amplification and transmission is disclosed. A compression device can receive an input signal and generate a compressed signal that can be passed to an amplification stage to reduce intermodulation effects. The compression device can further generate compression information that can be transmitted to enable a mobile device receiving an amplified version of the compressed signal and the compression information to decompress the amplified version of the compressed signal. Further, a mobile device that can receive an amplified compressed signal and compression information, such that the mobile device can decompress the amplified compressed signal, is also disclosed. The disclosed subject matter can enable use of lower cost, smaller, and less complex RF amplifiers within a wireless network environment.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: January 10, 2017
    Assignee: AT&T MOBILITY II LLC
    Inventor: Sheldon Kent Meredith
  • Patent number: 9526109
    Abstract: Systems, methods, and software described herein provide enhancements for monitoring communication data for multiple applications on a wireless device. In particular, a wireless access node is configured to monitor signal to noise data for a first frequency band from a second frequency band. When the signal to noise data meets noise criteria, the access point schedules observation periods in the first frequency band to determine intermodulation distortion for the first frequency band from the second frequency band. Based on the intermodulation distortion meeting distortion criteria, the access point schedules the second frequency band to transmit data only when the first frequency band is neither transmitting nor receiving data.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: December 20, 2016
    Assignee: Sprint Communications Company L.P.
    Inventors: Andrew Mark Wurtenberger, Sreekar Marupaduga, Patrick J. Schmidt
  • Patent number: 9510094
    Abstract: A mobile device uses externals microphone signals to improve the estimate of background noise that it computes. In order to improve voice quality in a first signal that is produced by an internal microphone, the mobile device identifies an external microphone device within proximity of the mobile device. The mobile device establishes a wireless connection with the external microphone device. The mobile device receives a second signal from the external microphone device through the wireless connection. The second signal is produced by a microphone of the external microphone device. The mobile device generates a noise profile based on the second signal, and then suppresses background/ambient noise from the first signal based on the noise profile. Other embodiments are also described.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: November 29, 2016
    Assignee: Apple Inc.
    Inventors: Baptiste P. Paquier, Bryan J. James, Aram M. Lindahl
  • Patent number: 9489608
    Abstract: An RFID card includes a smartcard controller that receives power from a host device. The RFID card also includes a small inductive device capable of inductive coupling with an RFID reader. The small inductive device is small enough to fit in the form factor of a memory card or SIM card. Enhancement circuits enhance the usable read and write distance of the RFID card.
    Type: Grant
    Filed: October 17, 2014
    Date of Patent: November 8, 2016
    Assignee: Tyfone, Inc.
    Inventors: Siva G. Narendra, Saurav Chakraborty, Prabhakar Tadepalli
  • Patent number: 9483722
    Abstract: An RFID card includes a smartcard controller that receives power from a host device. The RFID card also includes a small inductive device capable of inductive coupling with an RFID reader. The small inductive device is small enough to fit in the form factor of a memory card or SIM card. Enhancement circuits enhance the usable read and write distance of the RFID card.
    Type: Grant
    Filed: October 17, 2014
    Date of Patent: November 1, 2016
    Assignee: Tyfone, Inc.
    Inventors: Siva G. Narendra, Saurav Chakraborty, Prabhakar Tadepalli
  • Patent number: 9474033
    Abstract: Adjustment of a downlink transmit power parameter, such as a ceiling level, is disclosed. Signal-to-noise type information and committed power information can be employed to determine the ceiling level adjustment. A ceiling level can be a predetermined cap on transmission power for downlink channels between a user equipment and a base station. Where there is sufficient headroom in total transmission power and a power level greater than the predetermined ceiling can be effective, the ceiling can be adjusted to greater values than the predetermined value. Where total transmission power is more committed, ceiling adjustment can be prevented. Further, where there is no adequate benefit from increasing the ceiling, the adjustment of the ceiling can be prevented. While some instances can result in optimized transmission levels below the ceiling, instances can also be accommodated where the ceiling is to be increased.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: October 18, 2016
    Assignee: AT&T MOBILITY II LLC
    Inventors: Vladimir Gusavac, Manish Vaishnav
  • Patent number: 9461756
    Abstract: A method and apparatus for calibrating a terminal is provided. The apparatus includes a modem; a transmission chain configured to process a signal input from the modem and transmit the processed signal via an antenna; a reception chain configured to process a signal received via the antenna and transmit the processed signal to the modem; and a connector configured to connect an output of the transmission chain and an output of the reception chain via an envelope detector and a switch configured to turn on/off the envelope detector, calibrate a DC offset voltage and I and Q signals of the transmission chain by inputting a one-tone signal of 1 MHz into the transmission channel via the modem in a state where the envelope detector is turned on, and calibrate a second order input intercept point (IIP2) characteristic value by adjusting the signal input into the modem via the reception channel.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: October 4, 2016
    Assignee: Samsung Electronics Co., Ltd
    Inventor: Young-Taek Lee
  • Patent number: 9391590
    Abstract: A filter and method for filtering a signal are disclosed. The filter is equivalent to a plurality of bi-quad filters connected in series, and is implemented on a digital processor that receives a sequence of signal values at a sampling rate characterized by a sampling interval and generates a filtered signal value upon receiving each received signal value. The filter has a latency that is less than the sampling interval. The filtered values can be generated by adding a term to a received signal value and multiplying the sum by a gain constant that depends on the filter constants. The added term does not depend on the current received signal value. The filter can be implemented in fixed-point integer arithmetic.
    Type: Grant
    Filed: August 27, 2013
    Date of Patent: July 12, 2016
    Assignee: Keysight Technologies, Inc.
    Inventors: Daniel Y. Abramovitch, Christopher R. Moon
  • Patent number: 9385794
    Abstract: To provide a mobile terminal apparatus, radio base station apparatus and radio communication method that enable accurate precoding weights to be generated in coordinated multipoint transmission, a radio communication method of the invention is characterized in that a mobile terminal apparatus (10) performs channel estimation using a downlink reference signal, selects a PMI using the obtained channel estimation value, measures an IQI using at least the channel estimation value and the PMI, and transmits at least the PMI and IQI to a radio base station apparatus, and that the radio base station apparatus generates precoding weights using the PMI and IQI, and performs coordinated multipoint transmission utilizing MIMO transmission using the precoding weights.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: July 5, 2016
    Assignee: NTT DOCOMO, INC.
    Inventors: Anass Benjebbour, Satoshi Nagata
  • Patent number: 9369094
    Abstract: An exemplary system comprises a linearizer module, a first upconverter module, a power amplifier module, a signal sampler module, and a downconverter module. The linearizer module may be configured to receive a first intermediate frequency signal and to adjust the first intermediate frequency signal based on a reference signal and a signal based on a second intermediate frequency signal. The first upconverter module may be configured to receive and up-convert a signal based on the adjusted first intermediate frequency signal to a radio frequency signal. The power amplifier module may be configured to receive and amplify a power of a signal based on the radio frequency signal. The signal sampler module may be configured to sample a signal based on the amplified radio frequency signal. The downconverter module may be configured to receive and down-convert a signal based on the sampled radio frequency signal to the second intermediate frequency signal.
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: June 14, 2016
    Assignee: Aviat U.S., Inc.
    Inventors: Frank Matsumoto, Youming Qin, David C. M. Pham
  • Patent number: 9319788
    Abstract: A sound processing apparatus (400) is provided with: a directivity synthesis processing unit (410) for generating a first directivity sound pick-up signal by synthesizing a first sound pick-up signal and a relatively delayed second sound pick-up signal and a second directivity sound pick-up signal by synthesizing a relatively delayed first sound pick-up signal and a second sound pick-up signal; a comparison signal calculation unit (440) for generating a non-directivity level signal indicating the level of a sum of the directivity sound pick-up signals and a directivity level signal by adding the levels of the directivity sound pick-up signals; a level comparison unit (451) for acquiring the difference between the levels of the non-directivity level signal and the directivity level signal; and a delay control unit (452) for adjusting the delay amount such that the difference between the levels becomes smaller.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: April 19, 2016
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yutaka Banba, Takeo Kanamori
  • Patent number: 9300264
    Abstract: A receiver includes LNA-mixer arrangement, a current buffer arrangement and an analog filter arrangement. The LNA-mixer arrangement receives a plurality of input signals and provides a wide-band input match for a specified frequency range of operation. The LNA-mixer arrangement includes a plurality of LNA structures and a plurality of mixer structures where each of the LNA structure path is coupled to a single mixer structure. The LNA-mixer arrangement outputs a first signal. The current buffer arrangement receives the first signal and reduces the Image Rejection (IR) asymmetry between the high frequency portion and the low frequency portion of the first signal as well as provides a gain to the first signal. The current buffer arrangement outputs a second signal. The analog filter arrangement receives the second signals and perform filtering and calibration.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: March 29, 2016
    Assignee: MEDIATEK INC.
    Inventors: Ravikanth Suravarapu, Saravanan Rajapandian, Narayanan Baskaran, Caiyi Wang, Jing Li
  • Patent number: 9287904
    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: Grant
    Filed: October 8, 2013
    Date of Patent: March 15, 2016
    Assignee: BROADCOM CORPORATION
    Inventor: Markus Nentwig
  • Patent number: 9258819
    Abstract: A femtocell includes a frequency offset detecting module and a frequency correction module. The frequency offset detecting module calculates frequency offset and detects whether the frequency offset exceeds a default frequency offset. The frequency detecting offset module counts the time of the frequency offset exceeding the default frequency offset, and detects whether the counted number of times exceed a first default number. The frequency detecting module re-calculates frequency offset after an internal when the counted number of times does not exceed the first default number. The frequency correction module uses a last calculated frequency offsets to adjust the frequency of the femtocell, when the counted number of times exceed the first default number. A method of adjusting frequency of the femtocell is also provided.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: February 9, 2016
    Assignee: HON HAI PRECISION INDUSTRY CO., LTD.
    Inventor: Yu-Hung Lin
  • Patent number: 9202747
    Abstract: A radio frequency (RF) module comprises a conductive top layer configured to improve RF interference-shielding functionality with respect to one or more RF devices disposed on the module. The conductive top layer may be segmented as to form one or more segments of the top layer that are at least partially electrically isolated from surrounding segments or devices. A module may have a plurality of devices disposed thereon, wherein separate, at least partially isolated, top conductive layers correspond to different devices of the module. The top layer may be etched or cut to achieve such segmentation.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: December 1, 2015
    Assignee: Skyworks Solutions, Inc.
    Inventors: Howard E. Chen, Matthew Sean Read, Anthony James LoBianco, Hoang Mong Nguyen, Guohao Zhang, Dinhphuoc Vu Hoang
  • Patent number: 9203529
    Abstract: Aspects of the present disclosure relate to determining the location and/or density of vias that form part of an RF isolation structure of a packaged module and the resulting RF isolation structures. From electromagnetic interference (EMI) data, locations of where via density can be increased and/or decreased without significantly degrading the EMI performance of the RF isolation structure can be identified. In certain embodiments, one or more vias can be added and/or removed from a selected area of the packaged module based on the EMI data.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: December 1, 2015
    Assignee: Skyworks Solutions, Inc.
    Inventors: Howard E. Chen, Matthew Sean Read, Hoang Mong Nguyen, Anthony James LoBianco, Guohao Zhang, Dinhphuoc Vu Hoang
  • Patent number: 9202748
    Abstract: A radio frequency (RF) module comprises an electrical reference, or ground, plane to which one or more RF devices disposed on the module are electrically coupled, and may be disposed beneath the RF devices. The reference plane may be segmented as to form one or more segments of the reference plane that are at least partially electrically isolated from surrounding segments or devices. A module may have a plurality of devices disposed thereon, wherein separate, at least partially isolated reference planes, correspond to different devices of the module. The reference plane may be etched or cut to achieve such segmentation.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: December 1, 2015
    Assignee: Skyworks Solutions, Inc.
    Inventors: Anthony James LoBianco, Hoang Mong Nguyen
  • Patent number: 9197257
    Abstract: Disclosed herein is a passive, voltage mode transmitter assembly and method of operation. The passive, voltage mode transmitter assembly comprises a baseband filter configured to filter a source baseband signal, a harmonics filter, connected to the baseband filter, configured to remove harmonics from the filtered, source baseband signal, a passive, voltage mode mixer, connected to the harmonics filter, configured to up-convert an output of the harmonics filter to a radio signal, and a power amplifier, connected to the passive, voltage mode mixer, configured to amplify the radio signal.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: November 24, 2015
    Assignee: ST-ERICSSON SA
    Inventor: Andreas Axholt
  • Patent number: 9190962
    Abstract: A radio frequency (RF) power amplifier (PA) is reconfigured to operate in a low power mode from a high power mode. The RF PA has a first RF amplifier is connected to the first and second inputs of a first transformation network. The RF PA has a second a second RF amplifier connected to a second transformation network. During high power mode, both RF amplifiers drive a load coupled to the transformation networks. In low power mode the first RF amplifier is disabled and the first and second inputs of the first transformation are coupled together so as to change the load impedance seen by the second RF amplifier. The second RF amplifier continues to supply power to the load during operation in the low power mode.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: November 17, 2015
    Assignee: QUALCOMM INCORPORATED
    Inventors: Susanne A. Paul, Marius Goldenberg
  • Patent number: 9154080
    Abstract: A mixer with calibration circuit includes a first gm stage unit, a second gm stage unit, a first detecting unit, a second detecting unit, a comparison block, a control unit and a compensator. The first detecting unit and the second detecting unit are respectively connected to different gm stage unit, and the comparison block compares voltage signals of the first detecting unit and the second detecting unit. The control unit adjusts a current signal of the comparison block according to the comparative result of voltage signals of the first detecting unit and the second detecting unit. Further, the compensator adjusts the first gm stage unit and the second gm stage unit according to the current signal. Thereafter, the improvement of the LO leakage of the mixer can be achieved.
    Type: Grant
    Filed: September 12, 2013
    Date of Patent: October 6, 2015
    Assignee: Airoha Technology Corp.
    Inventor: Chao Hsi Chuang
  • Patent number: 9136989
    Abstract: In an embodiment, an apparatus comprises an in-phase-quadrature (IQ) signal amplifier having an IQ baseband input, an IQ mixer input connected to the IQ signal amplifier, a carrier leakage detector connected to outputs of the IQ mixer, and a carrier-null offset signal generator connected to the carrier leakage detector. The IQ mixer is configured to be driven by an IQ carrier signal. The carrier leakage detector is configured to output an in-phase leakage level measurement and a quadrature leakage level measurement in the absence of an IQ baseband signal at the IQ baseband input. The carrier-null offset signal generator is configured to (i) inject an in-phase carrier-null offset signal based on the in-phase leakage level measurement and (ii) inject a quadrature carrier-null offset signal based on the quadrature leakage level measurement.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: September 15, 2015
    Assignee: Motorola Solutions, Inc.
    Inventors: Dennis M. Drees, Bryan A. Hoon
  • Patent number: 9113427
    Abstract: This disclosure provides systems, methods, and apparatus for mobile transmit diversity. In one aspect a method of controlling a transmit power level of a wireless communications apparatus is provided. The method includes adjusting the transmit power level of a transmitter of the wireless communications apparatus to a first transmit power level in response to detecting a de-sense event indicative of interference with a signal received by a receiver of the wireless communications apparatus due to emissions from the transmitter. The method further includes maintaining the transmit power level substantially at the first transmit power level for a first time interval in response to adjusting the transmit power level to the first transmit power level. The method further includes adjusting a transmit power level limit of the transmitter after the time interval at a rate for a second time interval.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: August 18, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Rashid Ahmed Akbar Attar, Troy Russell Curtiss, Ammar Taiyebi Kitabi, Chintan Shirish Shah, Athreya Prasad, Sunil Rajendran, Ramchandran Srinivasan
  • Patent number: 9065506
    Abstract: A low pass filter connected between an individual port of a switch device and a high-frequency switch module attenuates the second harmonic and the third harmonic of a transmission signal input to a first transmission signal input terminal. Further, the inductances/capacitances of inductors and capacitors defining the low pass filter are set such that the phase of a harmonic signal generated by a power amplifier is different by 180° from the phase of a harmonic signal produced as a result of the low pass filter shifting the phase of a harmonic signal generated due to distortion in a switch device, in an end portion on the first transmission signal input terminal side.
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: June 23, 2015
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Takanori Uejima
  • Patent number: 9042838
    Abstract: A system and methods for cancelling transmission leakage signals in a wide bandwidth Distributed Antenna System (“DAS”) having remote units is disclosed. An internal cancellation circuit within the remote unit is employed to reduce the transmitted leakage signals by generating a cancellation signal. This cancellation signal is added to the received signal to cancel the transmission leakage signal in the receiving signal path. A pilot signal generation circuit is employed to optimize the cancellation circuit operating parameters. The frequency of the pilot signal is swept over a range to determine the pilot frequency having the highest electromagnetic coupling. The amplitude and phase of the cancellation signal is then optimized to minimize the level of transmission leakage in the receiving transmission path.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: May 26, 2015
    Assignee: Intel Corporation
    Inventor: Richard Neil Braithwaite
  • Patent number: 9042847
    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: Grant
    Filed: September 24, 2013
    Date of Patent: May 26, 2015
    Assignee: Hauwei Technologies Co., Ltd.
    Inventor: Yanzhao Zhou
  • Patent number: 9037089
    Abstract: A method and apparatus relate to coexistence of multiple RF subsystems on a communication device. An apparatus may include a plurality of radio frequency (RF) subsystems configured to receive or transmit communication signals; and an interference table indicative of zones of interference among the multiple RF subsystems, the zones of interference being based on RF measurements. At least one of the RF subsystems comprises a coexistence module configured to communicate coexistence-related messages with of the other RF subsystems, the coexistence-related messages being based on the zones of interference.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: May 19, 2015
    Assignee: BROADCOM CORPORATION
    Inventors: Aimin Sang, Kamesh Medapalli
  • Patent number: 9036734
    Abstract: Integrated circuits with wireless communications circuitry having digital predistortion (DPD) circuitry are provided. The digital predistortion circuitry may include a forward path filter, a time domain alignment (TDA) circuit, a frequency domain alignment (FDA) circuit, and an adaption circuit. The TDA circuit may receive power amplifier input signals and power amplifier output signals and may include a cross correlator, a peak detector, and a delay circuit for performing coarse time domain alignment (i.e., to align the power amplifier input and output signals). The FDA circuit may include a fast Fourier transform circuit, a matrix multiplier, and a matrix inverter for performing frequency domain alignment. The adaption circuit may analyze the aligned signals output from the FDA circuit to produce impulse response coefficients that are then used to control the forward path filter. The forward path filter may serve to predistort transmit signals prior to radio-frequency amplification.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: May 19, 2015
    Assignee: Altera Corporation
    Inventors: Volker Mauer, Shahin Gheitanchi, Benjamin Thomas Cop
  • Patent number: 9037101
    Abstract: A remote radio head system (RRH) transmits first Radio-Frequency-signals (signals) at a first frequency-band (band) and second signals at a second band. The RRH receives and processes first control-data (data) to determine a first duty-cycle (cycle). In response to the first data and based on the first cycle, the RRH switches power between a first power amplifier system (PA) and a second PA and transmits the first signals at the first band through the first PA and transmits the second signals at the second band through the second PA. The RRH receives and processes second data to determine a second cycle. Responding to the second data and based on the second cycle, the RRH switches power between the first PA and the second PA and transmits the first signals at the first band through the first PA and transmits the second signals at the second band through the second PA.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: May 19, 2015
    Assignee: Sprint Communications Company L.P.
    Inventors: Sharath Somashekar, Cody Carl Heinrich, Mark Alan Wade, Xianghong Zeng
  • Patent number: 9031521
    Abstract: A power amplifier system includes an input operable to receive an original value that reflects information to be communicated and an address data former operable to generate a digital lookup table key. The power amplifier system also includes a predistortion lookup table coupled to the address data former and a power amplifier having an output and coupled to the predistortion lookup table. The power amplifier system further includes a feedback loop providing a signal associated with the output of the power amplifier to the predistortion lookup table and a switch disposed in the feedback loop and operable to disconnect the predistortion lookup table from the output of the power amplifier.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: May 12, 2015
    Assignee: Dali Systems Co. Ltd.
    Inventors: Dali Yang, Jia Yang
  • Patent number: 9031527
    Abstract: Apparatus, systems, and methods implementing techniques for calibrating a filter circuit. A comparator generates an output based on a filter output amplitude signal and a reference amplitude signal. A calibration logic unit receives the comparator output and produces a component code that is used by the filter circuit to adjust one or more component values.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: May 12, 2015
    Assignee: Marvell International Ltd.
    Inventors: King Chun Tsai, Sang Wong Son, Wayne A. Loeb