Predistortion (e.g., For Power Amplifier) Patents (Class 455/114.3)
  • Patent number: 10630323
    Abstract: Certain aspects of the present disclosure introduce transmit chain asymmetry to meet tighter specifications of a band on one side of a spectrum while sacrificing emissions margin of a band on the opposite side of the spectrum. One example apparatus generally includes a distortion module configured to generate an input signal, and an amplifier coupled to the distortion module and configured to generate an amplified signal based on the input signal. In certain aspects, the input signal is generated such that a power of the amplified signal at a first bandwidth is skewed relative to a power of the amplified signal at a second bandwidth, the first and second bandwidths being adjacent to a main channel bandwidth of the amplified signal.
    Type: Grant
    Filed: April 23, 2018
    Date of Patent: April 21, 2020
    Assignee: QUALCOMM Incorporated
    Inventors: Ryan Scott Castro Spring, Sanjay Avasarala
  • Patent number: 10547337
    Abstract: A radio frequency front-end circuit performs, in a communication band made up of a plurality of communication channels within a particular frequency band used in a system, wireless communication through a use channel selected from among empty communication channels in the plurality of communication channels, the radio frequency front-end circuit including a transmission-side amplifier circuit and a transmission circuit both serving as a transmission-side circuit that produces, from a transmitted signal after being subjected to a predistortion process, a transmitted signal corresponding to the use channel, and a frequency variable filter serving as a tunable filter that attenuates a radio frequency signal of a spurious wave at least in an alternate adjacent channel relative to the use channel.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: January 28, 2020
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Atsushi Horita, Hirotsugu Mori
  • Patent number: 10530402
    Abstract: A circuit and apparatus for filtering harmful harmonics is disclosed. The circuit and apparatus include a power amplifier core that uses equally sized inverter based amplifiers. The amplifier core cells provide uniform load to all phases of a fundamental frequency to cancel all harmonics at an output. The power amplifier stages are driven into nonlinearity, and the combination of harmonics is performed at the output by varying series connected capacitors. The harmonic combination is performed at the outputs, leaving no further scope of nonlinearity in the signal chain.
    Type: Grant
    Filed: April 10, 2019
    Date of Patent: January 7, 2020
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Sudipto Chakraborty
  • Patent number: 10523159
    Abstract: A pre-distorter that both accurately compensates for the non-linearities of a radio frequency transmit chain, and that imposes as few computation requirements in terms of arithmetic operations, uses a diverse set of real-valued signals that are derived from the input signal. The derived real signals are passed through configurable non-linear transformations, which may be adapted during operation, and which may be efficiently, implemented using lookup tables. The outputs of the non-linear transformations serve as gain terms for a set of complex signals, which are functions of the input, and which are summed to compute the pre-distorted signal. A small set of the complex signals and derived real signals may be selected for a particular system to match the classes of non-linearities exhibited by the system, thereby providing further computational savings, and reducing complexity of adapting the pre-distortion through adapting of the non-linear transformations.
    Type: Grant
    Filed: May 10, 2019
    Date of Patent: December 31, 2019
    Assignee: NanoSemi, Inc.
    Inventors: Alexandre Megretski, Yan Li, Kevin Chuang, Zohaib Mahmood, Helen H. Kim
  • Patent number: 10469109
    Abstract: In certain aspects of the present disclosure, a method for wireless communication comprises predistorting a first signal based on a set of coefficients to generate a first predistorted signal, outputting the first predistorted signal for a first transmission to a receiving device, and receiving a first feedback signal from the receiving device, wherein the first feedback signal provides feedback of a first receive signal at the receiving device corresponding to the first transmission. The method also comprises determining whether to store the set of coefficients in a memory based on the received first feedback signal, and storing the set of coefficients in the memory based on the determination.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: November 5, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Igor Gutman, Ariel Yaakov Sagi, Alecsander Petru Eitan
  • Patent number: 10432236
    Abstract: A front-end module, which uses a carrier aggregation method in which communication is performed by simultaneously using Band 8 and Band 3, includes an antenna switch module that switches connections between an antenna and a plurality of signal paths, a first circuit that is connected to a Band 8 signal path, and a second circuit that is connected to a Band 3 signal path and is electromagnetic-field coupled with the first circuit. A signal including a Band 3 frequency component that propagates from the signal path to the signal path via the antenna switch module and a signal including a Band 3 frequency component that propagates from the signal path to the signal path via the first circuit and the second circuit have a phase-shifted relationship with each other.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: October 1, 2019
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventor: Koichi Ueno
  • Patent number: 10394198
    Abstract: A transmitter for wireless energy transmission includes: a transmission device for generating an alternating magnetic field, a determination device for providing a signal which indicates an object in the area of the transmission device, and a control device for limiting the strength of the alternating field on at least three different levels based on the signal.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: August 27, 2019
    Assignee: Robert Bosch GmbH
    Inventors: Juergen Mack, Guenter Lohr, Marcin Rejman
  • Patent number: 10326361
    Abstract: A low dropout regulator that produces an output includes a comparison circuit, configured to compare a signal representative of the output and a reference signal to produce a comparison result. The low dropout regulator also includes a loop controller, coupled to the comparison circuit, configured to generate an output circuit control signal based at least in part on the comparison result. The low dropout regulator also includes an output circuit, comprising two or more output stages, configured to adjust a number of active output stages of the two or more output stages based on the output circuit control signal.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: June 18, 2019
    Assignee: MediaTek Inc.
    Inventors: Nien-Hui Kung, Chia-Hua Chou, Yen-Hsun Hsu
  • Patent number: 10303881
    Abstract: A domain-specific hardwired symbolic communications machine is described that processes information via the hardwired mapping of symbols from one or more domains onto other such domains, computing and communicating with improved security and reduced power consumption because it has no CPU, no Random Access Memory (RAM), no instruction registers, no Instruction Set Architecture (ISA), no operating system (OS) and no applications programming. The machine provides web services by recognizing valid requests based on the processing of symbols and the validating of those symbols according to various domains. In some embodiments the requests may conform or be related to, for example, Long Term Evolution (LTE), Hypertext Transfer Protocol (HTTP), or fourth generation (4G) wireless technology. Further, in some embodiments, the machine has no unconstrained RAM into which malware may insert itself and needs no anti-virus software.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: May 28, 2019
    Assignee: Hackproof Technologies Inc.
    Inventor: Joseph Mitola, III
  • Patent number: 10291270
    Abstract: A circuit and apparatus for filtering harmful harmonics is disclosed. The circuit and apparatus include a power amplifier core that uses equally sized inverter based amplifiers. The amplifier core cells provide uniform load to all phases of a fundamental frequency to cancel all harmonics at an output. The power amplifier stages are driven into nonlinearity, and the combination of harmonics is performed at the output by varying series connected capacitors. The harmonic combination is performed at the output, leaving no further scope of nonlinearity in the signal chain.
    Type: Grant
    Filed: October 1, 2018
    Date of Patent: May 14, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Sudipto Chakraborty
  • Patent number: 10243595
    Abstract: Disclosed are a detection method and device for a digital intermediate frequency processing system. The method comprises: forming and transmitting excitation data to a digital intermediate frequency processing system; collecting detection data formed by processing the excitation data by the digital intermediate frequency processing system; and performing a bit-by-bit comparison on the detection data and reference data to form a detection result. Further provided is a computer storage medium.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: March 26, 2019
    Assignee: Sanechips Technology Co. Ltd.
    Inventors: Xiuhong Ren, Boyuan Fan
  • Patent number: 10148296
    Abstract: A transmitter includes a signal generator arranged to generate a digital baseband signal representative of a signal for transmission; a digital predistortion, DPD, circuit configured to predistort the digital baseband signal; and a signal adjustment circuit operably coupled to the signal generator and the DPD circuit and configured to receive the generated signal and apply shaping to adjust the predistortion applied to the envelope of the generated signal.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: December 4, 2018
    Assignee: MediaTek, Inc.
    Inventors: Toru Matsuura, Paul Cheng Po Liang
  • Patent number: 10116340
    Abstract: A circuit and apparatus for filtering harmful harmonics is disclosed. The circuit and apparatus include a power amplifier core that uses equally sized inverter based amplifiers. The amplifier core cells provide uniform load to all phases of a fundamental frequency to cancel all harmonics at an output. The power amplifier stages are driven into nonlinearity, and the combination of harmonics is performed at the output by varying series connected capacitors. The harmonic combination is performed at the output, leaving no further scope of nonlinearity in the signal chain.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: October 30, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Sudipto Chakraborty
  • Patent number: 10103755
    Abstract: Systems and methods for radio frequency digital predistortion in a multi-band transmitter are disclosed. In one embodiment, the multi-band transmitter includes a digital upconversion system configured to digitally upconvert digital input signals to provide digital radio frequency signals. Each digital input signal and thus each digital radio frequency signal corresponds to a different band of a multi-band transmit signal to be transmitted by the multi-band transmitter. The multi-band transmitter also includes a radio frequency digital predistortion system configured to digitally predistort the digital radio frequency signals to provide predistorted digital radio frequency signals, and a combiner configured to combine the predistorted digital radio frequency signals to provide a multi-band predistorted digital radio frequency signal.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: October 16, 2018
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Mark Edward Rollins
  • Patent number: 10075201
    Abstract: An adaptive controller for a nonlinear system includes a Volterra filter having a transfer function defined by P coefficients. The controller includes an alignment/compensation circuit, which aligns the input samples to the output samples of the nonlinear system. The controller generates a P×P matrix using at least one of input samples to, or output samples from the nonlinear system and normalizes each element of the P×P matrix using a respective normalization factor. The controller generates and solves a system of P linear equations from the P×P matrix and a P×1 matrix derived from input and output samples of the nonlinear system using Cholesky decomposition that may include Fast Inverse Square Root operations and forward backward elimination to generate P values. The controller multiplies each of the P values by an inverse of a respective one of the normalization factors to generate the P coefficients for the Volterra filter.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: September 11, 2018
    Assignee: Intel IP Corporation
    Inventors: Avi Gazneli, Michael Kerner, Itay Almog, Amit Knoll
  • Patent number: 10009075
    Abstract: Here, operation for 3D beam forming is disclosed. UE, receiving reference signals from one or more base stations (eNBs), may report feedback information comprising precoding matrix information to the one or more eNBs. The precoding matrix information indicates a first type precoding matrix for a horizontal direction and a second type precoding matrix for a vertical direction. eNBs may transmit signals, which are precoded based on a third type precoding matrix for beam forming both on the horizontal direction and the vertical direction.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: June 26, 2018
    Assignee: LG Electronics Inc.
    Inventors: Hyunsoo Ko, Heejeong Cho, Hyeyoung Choi, Ilmu Byun, Kungmin Park
  • Patent number: 9894658
    Abstract: Provided is a joint pattern beam sectorization method and apparatuses for performing the same, wherein the joint pattern beam sectorization method including generating, in a service target region, a pattern sector corresponding to an antenna array including antennas having an identical radiation pattern by using the antenna array and generating pattern beam sectors in the pattern sector through a beamforming using the antennas.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: February 13, 2018
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Gye Tae Gil, Ju Yong Lee, Dong Ho Cho, Dae Hee Park, Chang Bae Yoon, Sang Min Oh, Han Young Yim, Yong Hoon Lee
  • Patent number: 9871541
    Abstract: A power amplification module includes a first input terminal arranged to receive a first transmission signal in a first frequency band, a second input terminal arranged to receive a second transmission signal in a second frequency band higher than the first frequency band, a first amplification circuit that amplifies the first transmission signal, a second amplification circuit that amplifies the second transmission signal, a first filter circuit located between the first input terminal and the first amplification circuit, and a second filter circuit located between the second input terminal and the second amplification circuit. The first filter circuit is a low-pass filter that allows the first frequency band to pass therethrough and that attenuates a harmonic of the first transmission signal and the second transmission signal. The second filter circuit is a high-pass filter that allows the second frequency band to pass therethrough and that attenuates the first transmission signal.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: January 16, 2018
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Takayuki Tsutsui, Satoshi Tanaka, Hidenori Obiya
  • Patent number: 9813169
    Abstract: An RF or other high frequency transceiver including a loopback reference channel for measurement of an absolute power level. A transmit channel in the transceiver includes a programmable power amplifier that can be controlled to operate at a selected power level, and a receive channel including a receive amplifier, mixers, filters, and analog-to-digital converters. The loopback reference channel includes a self-biased amplifier, followed by a series of buffers that generate a square wave from the received signal, and an attenuator applying an attenuation gain to the square wave. The transmit power at a programmed power level can be calculated from ratios of a measured power level of a transmitted signal as received by the receive channel to the measured power level of the transmitted signal using the loopback reference channel.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: November 7, 2017
    Assignees: TEXAS INSTRUMENTS INCORPORATED, TEXAS INSTRUMENTS DEUTSCHLAND GMBH
    Inventors: Josef Einzinger, Sudipto Chakraborty
  • Patent number: 9793871
    Abstract: An apparatus and method for controlling wireless transmission. The apparatus, which controls a transmitter that provides an output signal by upconverting and amplifying an input signal, includes a memory configured to store first calibration data representing a saturation power and a linear gain of a reference transmitter as functions of operating conditions of the reference transmitter. A controller may be configured to estimate a saturation power and a linear gain of the transmitter of the apparatus based on operating conditions of the transmitter and the first calibration data. The controller may generate at least one control signal for controlling an operation of the transmitter based on a saturation power difference between the estimated saturation power and a target saturation power and a linear gain difference between the estimated linear gain and a target linear gain.
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: October 17, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Dong-Su Kim, Tae-Ui Kim
  • Patent number: 9735741
    Abstract: Aspects of this disclosure relate to a receiver for digital predistortion (DPD). The receiver includes an analog-to-digital converter (ADC) having a sampling rate that is lower than a signal bandwidth of an output of a circuit having an input that is predistorted by DPD. DPD can be updated based on feedback from the receiver. According to certain embodiments, the receiver can be a narrowband receiver configured to observe sub-bands of the signal bandwidth. In some other embodiments, the receiver can include a sub-Nyquist ADC.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: August 15, 2017
    Assignee: Analog Devices Global
    Inventors: Patrick Joseph Pratt, Ronald D. Turner, Joseph B. Brannon
  • Patent number: 9722647
    Abstract: A cellular radio architecture that includes a transceiver front-end circuit including an antenna and a switch module having a switching network that directs analog transmit signals to be transmitted to the antenna and receives receive signals from the antenna. The architecture further includes a receiver module having a separate signal channel for each of the signal paths in the multiplexer module, where each signal channel in the receiver module includes a receiver delta-sigma modulator that converts analog receive signals to a representative digital signal. The architecture also includes a transmitter module having a transmitter delta-sigma modulator for converting digital data bits to the transmit signals. The transmitter module includes a tunable bandpass filter and a power amplifier for amplifying the transmit signals before transmitting. The architecture also includes a calibration feedback and switch module that receives the amplified signals from the power amplifier.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: August 1, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Timothy J. Talty, Mohiuddin Ahmed, Cynthia D. Baringer, Yen-Cheng Kuan, James Chingwei Li, Hsuanyu Pan, Emilio A. Sovero
  • Patent number: 9712121
    Abstract: This disclosure provides a circuit for linearizing an output signal Sout produced by a non-linear component based on an input signal x(n). The circuit comprises a primary pre-distorter module configured to generate a pre-distorted signal y(n) based on the input signal x(n) and a primary pre-distortion function parameterized by a pre-distortion parameter ? and to feed the pre-distorted signal y(n) to the non-linear component. The circuit comprises an estimation module. The estimation module is configured to receive samples z(n) of the output signal Sout, and to determine the pre-distortion parameter ?. The estimation module comprises a secondary pre-distorter module configured to generate a secondary pre-distorter output signal r(n) based on a secondary pre-distortion function and the samples z(n) of the output signal Sout.
    Type: Grant
    Filed: November 22, 2014
    Date of Patent: July 18, 2017
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
    Inventors: Bjorn Gavert, Tony Gustafsson
  • Patent number: 9712251
    Abstract: A distortion compensation device includes: a signal processing unit to perform signal processing on a symbol; a storage unit to store a distortion compensation value for every pattern string including a symbol of interest and predetermined number of symbols ahead of the symbol of interest among a plurality of input symbols, a distortion in the signal processing unit being compensated for such that the symbol of interest is corrected to a target value based on the distortion compensation value; a first acquisition unit to acquire a pattern string of interest including the current input symbol and the predetermined number of input symbols ahead of the current input symbol; a second acquisition unit to acquire the distortion compensation value associated with the pattern string of interest from the storage unit; and a setting unit to set the distortion compensation value to a correction value of the signal processing unit.
    Type: Grant
    Filed: August 26, 2015
    Date of Patent: July 18, 2017
    Assignee: FUJITSU LIMITED
    Inventor: Hironobu Hongou
  • Patent number: 9590567
    Abstract: An apparatus relates generally to preconditioning an input signal. In this apparatus, a first digital predistortion module and a second digital predistortion module are for receiving the input signal for respectively providing a first predistorted signal and a second predistorted signal. A combiner is for combining the first predistorted signal and the second predistorted signal for providing an output signal. The first digital predistortion module includes a moving mean block for receiving the input signal for providing a moving mean signal. The first digital predistortion module further includes a digital predistorter for receiving the input signal and the moving mean signal for providing the first predistorted signal.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: March 7, 2017
    Assignee: XILINX, INC.
    Inventors: Hongzhi Zhao, Christopher H. Dick
  • Patent number: 9548783
    Abstract: A method, system, and device provide power-efficient communications within the context of available power. Transmission and receipt data rates are scalable in accordance with output power available from a power source. Data is transmitted at a data rate determined, at least in part, by the available output power.
    Type: Grant
    Filed: October 11, 2012
    Date of Patent: January 17, 2017
    Assignee: SUNRISE MICRO DEVICES, INC.
    Inventors: Edgar H. Callaway, Jr., Paul E. Gorday
  • Patent number: 9515685
    Abstract: Apparatus and a method for predistortion of a radio-frequency signal are described. At least one predistortion unit is described that is arranged to receive an analog baseband signal before amplification and to generate an analog predistortion signal based on said analog baseband signal. At least one mixer unit is also described and may be electrically coupled to the at least one predistortion unit. In this case, the at least one mixer unit is arranged to receive the analog baseband signal before amplification and the analog predistortion signal and to generate a weighted combination of said signals.
    Type: Grant
    Filed: April 10, 2014
    Date of Patent: December 6, 2016
    Assignee: BROADCOM CORPORATION
    Inventors: Juhani Kalervo Aalto, Jari Johannes Heikkinen
  • Patent number: 9509350
    Abstract: A non-linear pre-distortion engine maintaining constant peak power at its output is disclosed. The engine includes a compression estimator, a crest factor reduction processor, a digital pre-distorter and a power amplifier. The compression estimator is configured to generate a compression estimate based on an input signal and a feedback signal. The feedback signal is based on an RF output signal. The crest factor reduction processor is configured to reduce a crest factor of the input signal to generate a crest factor reduced signal based on the compression estimate. The digital pre-distorter is configured to apply a pre-distortion to the crest factor reduced signal after an initial phase and generate a pre-distorted signal based on pre-distortion parameters. The power amplifier is configured to amplify the pre-distorted signal to generate the RF output signal.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: November 29, 2016
    Assignee: Infineon Technologies AG
    Inventors: Thomas Magesacher, Peter Singerl, Martin Mataln, Christian Schuberth
  • Patent number: 9497701
    Abstract: A method including determining whether a transmitter of an apparatus has information to transmit; and causing a power amplifier of said apparatus to enter a first power state in response to said determining; wherein said determining is carried out within a radio portion of said apparatus.
    Type: Grant
    Filed: June 29, 2015
    Date of Patent: November 15, 2016
    Assignee: Nokia Solutions and Networks Oy
    Inventors: Bjoern Jelonnek, Andree Haubrich, Michael Weber
  • Patent number: 9484890
    Abstract: Various embodiments of the invention provide for improved performance by reducing a quadrature error signal. In certain embodiments, this is accomplished by using a mixed-signal architecture comprising analog and digital circuit components in a closed-loop configuration that generates from a detected quadrature error signal a calibration quadrature signal that is then compensated at a virtual ground of an analog front end circuit. Some embodiments allow for pre-calibration for quadrature error and/or adaptive compensation of unwanted drift effects of the quadrature error, including temperature drifts.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: November 1, 2016
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Gabriele Cazzaniga, Luciano Prandi, Carlo Caminada, Federico Forte
  • Patent number: 9444411
    Abstract: A radio frequency (RF) amplification circuit and a closed-loop amplitude linearization circuit are disclosed. The RF amplification circuit amplifies an RF signal to generate an amplified RF signal. The RF amplification circuit and the closed-loop amplitude linearization circuit form a fast control loop and a slow control loop. The slow control loop estimates a total radiated power (TRP) from the RF amplification circuit to create a TRP estimate using a representation of the amplified RF signal, and controls a fast loop gain of the fast control loop based on the TRP estimate. The fast control loop applies a gain adjustment to the RF amplification circuit based on the fast loop gain and a difference between a target reference amplitude and a measured feedback amplitude. The gain adjustment controls amplitude distortion in the RF amplification circuit. The fast loop gain controls TRP-drift in the RF amplification circuit.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: September 13, 2016
    Assignee: Qorvo US, Inc.
    Inventors: Baker Scott, Dirk Robert Walter Leipold, George Maxim
  • Patent number: 9445375
    Abstract: The invention is a method and a system for updating pre-distortion coefficients, which is used to solve the problem of interference with neighbor cells due to the inferior pre-distortion coefficients. The method includes: presetting a primary table and a standby table, which store default and updated pre-distortion coefficients respectively; when a data source of a pre-distortion processor adopts the standby table, adopting the updated pre-distortion coefficients to perform parameter output processing to acquire pre-distortion parameters, and conveying the pre-distortion parameters and an input signal to the pre-distortion processor to process to acquire pre-distortion signals; conveying the pre-distortion signals through various signal processors to acquire a first signal, and determining the power data of the first signal; and based on the comparing result of the power data of the first signal and a setting range, there are different actions.
    Type: Grant
    Filed: December 30, 2013
    Date of Patent: September 13, 2016
    Assignee: DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD.
    Inventors: Jun Xiong, Tao Duan, Huarong Sun, Peng Xiao, Ce Wang, Jieli Wang
  • Patent number: 9432063
    Abstract: A radio frequency signal transceiver includes: a transmission circuit configured to perform power amplification on an input first analog signal, wirelessly transmit the first analog signal after power amplification, and output the first analog signal after power amplification to a pre-distortion circuit; the pre-distortion circuit configured to convert the first analog signal after power amplification into a second analog signal and output the second analog signal, where the second analog signal is used to feedback distortion of the first analog signal to compensate the first analog signal in advance according to the distortion; and a receiving circuit configured to wirelessly receive a third analog signal, and process and output the third analog signal. The radio frequency signal transceiver can improve efficiency in receiving and transmitting a radio frequency signal, reduce a cost of a base station system, and reduce a difficulty in implementing the base station system.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: August 30, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Jian Ou, Yungang Li, Haiqiang Sheng, Yingjun Li
  • Patent number: 9288092
    Abstract: A tuner receives a received signal using one of a plurality of transmission formats that use at least one of either a first frequency or a second frequency band. A determination unit determines the transmission format being used in the received signal from among the plurality of transmission formats. In the determination unit, a pattern matching unit stores in advance a plurality of patterns respectively expressing a received waveform of a preamble in each of the plurality of transmission formats, conducts a pattern matching process between the received signal and the each of the plurality of patterns, and obtains a correlation value. A transmission mode determination unit determines the transmission format being used in the received signal on the basis of the correlation value.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: March 15, 2016
    Assignee: Panasonic Corporation
    Inventors: Hisateru Kobatake, Shigeru Soga, Teruaki Hasegawa, Ippei Kanno, Yoshinobu Matsumura
  • Patent number: 9287829
    Abstract: Control systems and methods for power amplifiers operating in envelope tracking mode are presented. A set of corresponding functions and modules are described and various possible system configurations using such functions and modules are presented.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 15, 2016
    Assignee: Peregrine Semiconductor Corporation
    Inventors: Dan William Nobbe, Jeffrey A. Dykstra, Chris Olson, James S. Cable
  • Patent number: 9281907
    Abstract: One example embodiment provides a system, apparatus, and method for using polynomial models in tone calibration for quadrature error correction in I/Q receivers. In one example embodiment, method for calibrating an I/Q receiver is provided and includes receiving a first mismatch parameter indicating a mismatch between I and Q channels of the I/Q receiver; and estimating a second mismatch parameter from the first mismatch parameter using a polynomial model.
    Type: Grant
    Filed: May 20, 2013
    Date of Patent: March 8, 2016
    Assignee: ANALOG DEVICES, INC.
    Inventors: Wei An, Richard P. Schubert, Yosef Stein
  • Patent number: 9276617
    Abstract: Digital pre-distortion (DPD) systems are often used to improve the linearity of a power amplifier in transmitters. These DPD systems are typically implemented in baseband (prior to modulation). However, ever increasing signal bandwidth requirements limits the practicality of DPD systems implemented in baseband. A DPD system in the radio frequency (RF) domain (as opposed to in baseband) can solve this problem and further improve a DPD system's ability to correct for distortions. The RF domain DPD system is upstream from a digital-to-analog converter, and performs DPD after a baseband signal is up-sampled into the RF domain (after the modulation process). When compared against a baseband DPD system, the RF domain DPD system can handle significantly wider bandwidth, and has an improved ability to linearize a wide variety of distortions present in the spectrum.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: March 1, 2016
    Assignee: ANALOG DEVICES, INC.
    Inventors: Bernd Schafferer, Bing Zhao
  • Patent number: 9270023
    Abstract: A random jitter beamforming method for reducing the influence of a side lobe to decrease a beam width, and a transmitter and a receiver using the same are provided. The random jitter beamforming method includes dividing a series of binary sequences to generate a plurality of bit groups, designating a beam pattern, corresponding to each of the bit groups, from a set of two or more beam patterns having the same gain and phase in a target direction, and forming a beam with the corresponding beam pattern, for each of the bit groups.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: February 23, 2016
    Assignee: Electronics and Telecommunications Research Institute
    Inventor: Byung-Jae Kwak
  • Patent number: 9258081
    Abstract: A predistortion function is evaluated with in-phase (I) and quadrature (Q) data words as arguments, while additive I and Q data words are generated in accordance with a comparison of the I and Q data words with a full scale value that generates maximum current in a digital power amplifier. The additive I and Q data words are added to the computed I and Q data words to produce predistorted I and Q data words. The predistorted I and Q data words are provided in a sequence to the digital power amplifier, which generates a corresponding radio-frequency (RF) analog signal.
    Type: Grant
    Filed: February 6, 2013
    Date of Patent: February 9, 2016
    Assignee: MStar Semiconductor, Inc.
    Inventors: Dennis Mahoney, Khurram Muhammad
  • Patent number: 9252718
    Abstract: Systems and methods are disclosed for digital predistortion for a concurrent multi-band transmitter using a single adaptor and a same set of predistortion coefficients for separate digital predistorters for each band. In one embodiment, the single adaptor is configured to adaptively configure a set of predistortion coefficients based on a memory polynomial digital baseband model of the digital predistorters having a same set of predistortion coefficients for each of the digital predistorters. By using the same set of predistortion coefficients for the separate digital predistorters for each band, a complexity of the digital predistortion is substantially reduced.
    Type: Grant
    Filed: August 19, 2013
    Date of Patent: February 2, 2016
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Pierre-Andre Laporte, Haiying Cao
  • Patent number: 9241315
    Abstract: A method, system, and device provide power-efficient communications within the context of available power. Transmission and receipt data rates are scalable in accordance with output power available from a power source. Data is transmitted at a data rate determined, at least in part, by the available output power.
    Type: Grant
    Filed: October 11, 2012
    Date of Patent: January 19, 2016
    Assignee: SUNRISE MICRO DEVICES, INC.
    Inventors: Edgar H. Callaway, Jr., Paul E. Gorday
  • Patent number: 9237054
    Abstract: A distortion compensation device includes: a memory configured to store a first and second table, different addresses being assigned to the first and second table respectively, each of the addresses being related to a distortion compensation coefficient to compensate for a non-linear distortion, a first address in the first table and a second address in the second table corresponding to respective first and second ranges of power or amplitude of a transmission signal, and parts of the first and second ranges overlapping each other; and a processor coupled to the memory and configured to: update the respective distortion compensation coefficients related to the first address and the second address simultaneously, in accordance with a single value of the power or the amplitude, and compensate for the non-linear distortion generated by an amplifier amplifying the power of the transmission signal, by using at least one of the first and second table.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: January 12, 2016
    Assignee: FUJITSU LIMITED
    Inventor: Toshio Kawasaki
  • Patent number: 9236898
    Abstract: Transmitter observation receivers and methods are described that can predistortion-compensate transmitters capable of operating in multiple communication bands and frequency ranges. Such observation receivers and method involve generating at least one compensation signal such that a signal to be transmitted that is within a bandwidth that simultaneously encompasses multiple frequency ranges is compensated.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: January 12, 2016
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Bradley John Morris, Somsack Sychaleun
  • Patent number: 9231530
    Abstract: A system for calibrating a power amplifier (PA) includes a memory, a processor, a digital pre-distorter (DPD), and a data converter. The DPD includes a programming interface module, a pattern generator, a multiplier, and a pre-distorter module. The multiplier multiplies reference baseband stream data from the memory with pattern coefficient data generated by the pattern generator to generate shaped reference baseband stream data. The pre-distorter module generates pre-distorted shaped reference baseband stream data. The PA receives a low-power reference radio frequency (RF) signal corresponding to the pre-distorted shaped reference baseband stream data and generates a high-power reference RF signal.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: January 5, 2016
    Assignee: FREESCALE SEMICONDUCTOR, INC.
    Inventors: Arvind Kaushik, Peter Z. Rashev, Amrit P. Singh, Akshat Mittal
  • Patent number: 9231688
    Abstract: An apparatus for wireless relaying comprises: a transmission unit for generating a wireless signal; an amplification unit for amplifying and outputting the wireless signal; a conversion unit for converting the wireless signal into a digital signal; and an adjustment unit for adjusting the amplification ratio of the amplifying unit so that the difference between an output level value of the digital signal and a predetermined target power is lower than a predetermined numerical value.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: January 5, 2016
    Assignee: KT Corporation
    Inventors: Jae Ho Chung, Byung Wan Yoon, Yung Ha Ji, Kyu Jeong Han
  • Patent number: 9219554
    Abstract: A communication device with a power detection scheme is disclosed. The communication device includes a transmitter for transmitting an RF signal, a demodulator for demodulating the RF signal by utilizing a phase-modulated (PM) signal provided from the transmitter to generate a demodulated signal, a loopback circuit coupled between the transmitter and the demodulator for transmitting the RF signal and the PM signal from the transmitter to the demodulator when the power detection scheme is enabled, and a power detector for detecting power of the demodulated signal.
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: December 22, 2015
    Assignee: MEDIATEK INC.
    Inventors: Hsin-Hung Chen, Hsiang-Hui Chang, Dimitris Nalbantis, Bernard Mark Tenbroek
  • Patent number: 9197466
    Abstract: A method of compensating carrier tone generation between duty cycles includes receiving a carrier frequency signal and a reference frequency signal, where the carrier frequency signal is mixed with a communication signal in a signal path. The method includes determining a first and second time differences between the carrier frequency signal and the reference frequency signal at respective clock edges of the reference frequency signal. The method includes converting the first time difference to a first corresponding phase value and the second time difference to a second corresponding phase value based on an operating frequency, and determining a phase difference between the first corresponding phase value and the second corresponding phase value. In turn, the method includes adjusting the communication signal with the phase difference independent of the signal path to maintain phase continuity in the signal path between the duty cycles.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: November 24, 2015
    Assignee: Broadcom Corporation
    Inventor: Alireza Tarighat Mehrabani
  • Patent number: 9197182
    Abstract: The present disclosure relates to envelope power supply calibration of a multi-mode RF power amplifier (PA) to ensure adequate headroom when operating using one of multiple communications modes. The communications modes may include multiple modulation modes, a half-duplex mode, a full-duplex mode, or any combination thereof. As such, each communications mode may have specific peak-to-average power and linearity requirements for the multi-mode RF PA. As a result, each communications mode may have corresponding envelope power supply headroom requirements. The calibration may include determining a saturation operating constraint based on calibration data obtained during saturated operation of the multi-mode RF PA. During operation of the multi-mode RF PA, the envelope power supply may be restricted to provide a minimum allowable magnitude based on an RF signal level of the multi-mode RF PA, the communications mode, and the saturation operating constraint to provide adequate headroom.
    Type: Grant
    Filed: August 27, 2013
    Date of Patent: November 24, 2015
    Assignee: RF Micro Devices, Inc.
    Inventors: Brian Baxter, Jason Millard, Roman Zbigniew Arkiszewski, Steven Selby
  • Patent number: 9178472
    Abstract: Circuitry, which includes a linear amplifier, is disclosed. The linear amplifier has a linear amplifier output and includes an input amplifier stage and an output amplifier stage. The output amplifier stage at least partially provides an envelope power supply voltage to a radio frequency (RF) power amplifier (PA) via an envelope power supply output using a selected one of a group of linear amplifier power supply signals. The group of linear amplifier power supply signals includes at least a first bi-directional power supply signal. The input amplifier stage selects the one of the group of linear amplifier power supply signals based on the envelope power supply voltage and a setpoint of the envelope power supply voltage.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: November 3, 2015
    Assignee: RF Micro Devices, Inc.
    Inventors: Andrew F. Folkmann, Nadim Khlat, Michael R. Kay
  • Patent number: 9112596
    Abstract: Embodiments provide methods, apparatus and computer software for use in calibrating a transmitter in operative association with a variable supply voltage. A phase distortion of the power amplifier is determined for a given instantaneous power. On the basis of the determined phase distortion for the power amplifier at the given instantaneous power, the transmitter is calibrated. Examples of transmitters in respect of which embodiments may be practiced include envelope tracking transmitters, envelope elimination and restoration transmitters, and polar transmitters.
    Type: Grant
    Filed: January 15, 2014
    Date of Patent: August 18, 2015
    Assignee: BROADCOM CORPORATION
    Inventor: Markus Rudiger Nentwig