Hum Or Noise Or Distortion Bucking Introduced Into Signal Channel Patents (Class 330/149)
  • Patent number: 10250211
    Abstract: Reducing non-linear distortions of an electronic device by performing at least the following: receiving, at an output stage circuit of an amplifier, an input signal from a previous stage circuit of the amplifier, driving a first subset of output transistors within the output stage circuit with an auxiliary buffer circuit to generate a first half cycle of an output signal Vout, driving a second subset of output transistors within the output stage circuit with the input signal to generate the first half cycle of the output signal Vout, and driving a set of output transistors with the input signal to generate a second half cycle of the output signal Vout, wherein the auxiliary buffer circuit equalizes the overall current gain associated with the first and second subset of output transistors with the overall current gain associated with the set of output transistors.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: April 2, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Ravpreet Singh
  • Patent number: 10224881
    Abstract: A method of linearizing a relationship between a signal to an amplifier and an output signal from the amplifier includes applying an inverse of a transfer function of the amplifier to the signal prior to presenting the signal as the amplifier input. The inverse transfer function is represented by a polynomial defined by a set of coefficients. The transmitter output signal is measured by the idle receiver in a time division duplex system. The output signal is filtered to isolate intermodulation products of a selected order and the peak power of the isolated intermodulation products is then estimated. An adaptive algorithm is applied in response to the estimate of the peak power to update the set of coefficients of the polynomial representing the inverse of the transfer function of the amplifier.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: March 5, 2019
    Assignee: Meteorcomm LLC
    Inventors: Arun Naidu, Jonathan Morarity
  • Patent number: 10209327
    Abstract: A radio frequency (RF) amplification method, comprising: modulating a first digital carrier signal with a digital envelop signal to generate digital RF pulse signals having a first frequency, converting the digital RF pulse signals into analog RF pulse signals, amplifying the analog RF pulse signals to generate an RF output signal, converting an analog feedback signal sampled from the RF output signal into digital feedback signals; demodulating the digital feedback signals with a second digital carrier signal to generate an in-phase (I) signal and a quadrature (Q) signal, and generating an amplitude setting signal for adjusting an amplitude of the digital envelop signal and a phase setting signal for adjusting a phase of the first digital carrier signal according to the I signal and the Q signal.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: February 19, 2019
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Tingting Song, Xin Jiang, Jifeng Chen
  • Patent number: 10211801
    Abstract: An RF hybrid coupler with phase and attenuation control that efficiently combines the functions of phase shifting and attenuation within a circuit. Embodiments include a hybrid coupler connected to parallel resistance-reactance (RX) circuits, where the reactance X may be a capacitor C or an inductor L; a hybrid coupler connected to parallel RX circuits (which may be variable), each of which is in turn series coupled to an inductive element L which corrects for attenuation range collapse while providing for fairly flat phase shift and attenuation performance as a function of frequency; and two hybrid couplers in a combined phase shifter and attenuator configuration, each with opposite frequency-dependent slopes and cascaded in series such that the slopes substantially cancel each other out, resulting in flat responses versus frequency.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: February 19, 2019
    Assignee: pSemi Corporation
    Inventor: John Birkbeck
  • Patent number: 10205542
    Abstract: Disclosed is a method of operating an electronic device to transmit an RF signal. The method includes: selecting output power of a PA included in the electronic device, which is required when a signal is transmitted through an antenna included in the electronic device; determining input power of the PA corresponding to the output power of the PA by using at least one of a first data point, a second data point, or a plurality of data points stored in a memory included in the electronic device; and controlling output power of an RF transmission circuit included in the electronic device based on the input power, wherein the plurality of data points are generated by being linearly interpolated between the first data point and the second data point. Various embodiments are possible.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: February 12, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Young-Min Lee, Jung-Hwan Son, Yu-Seon Lee
  • Patent number: 10205426
    Abstract: A linearization circuit reduces intermodulation distortion in an amplifier that includes a first stage and a second stage. The linearization circuit receives a first signal that includes a first frequency and a second frequency and generates a difference signal having a frequency approximately equal to the difference of the first frequency and the second frequency, generates an envelope signal based at least in part on a power level of the first signal, and adjusts a magnitude of the difference signal based on the envelope signal. When the amplifier receives the first signal at an input terminal, the first stage receives the adjusted signal, and the second stage does not receive the adjusted signal, intermodulation between the adjusted signal and the first signal cancels at least a portion of the intermodulation between the first frequency and the second frequency from the output of the amplifier.
    Type: Grant
    Filed: August 17, 2017
    Date of Patent: February 12, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Yu Zhu, Dylan Charles Bartle, Oleksiy Klimashov, Paul T. DiCarlo
  • Patent number: 10199993
    Abstract: The present invention addresses method, apparatus and computer program product for stabilization of the direct learning algorithm for wideband signals. Thereby, a signal to be amplified is input to a pre-distorter provided for compensating for non-linearity of the power amplifier, and the pre-distorted output signal from the pre-distorter is forwarded to the power amplifier. Parameters of the pre-distorter are adapted based on an error between the linearized signal output from the power amplifier and the signal to be amplified using an adaptive direct learning algorithm, and the linear system of equations formed by the direct learning algorithm are solved using a conjugate gradient algorithm, wherein, once per direct learning algorithm adaptation, at least one of the initial residual and the initial direction of the conjugate gradient algorithm are set based on the result of the previous adaptation.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: February 5, 2019
    Assignee: Nokia Solutions and Networks GMBH And Co., KG
    Inventors: Christian Reichl, Shavantha Kularatna, Rene Roeschke, Bjoern Jelonnek
  • Patent number: 10185020
    Abstract: A system and method compensates distortions in transmission line measurement by obtaining a frequency response of a transmission line responsive to a test signal; approximating the frequency response as a function of a complex valued variable; and applying an analytic continuation to extend the function of the complex valued variable to a modified frequency response corresponding to a lossless frequency response, to compensate for loss in the transmission line. The modified frequency response may be further sampled at linearly spaced points in a wave number domain to compensate for dispersion of the transmission line.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: January 22, 2019
    Assignee: Keysight Technologies, Inc.
    Inventor: Sho Okuyama
  • Patent number: 10181832
    Abstract: The present application provides a multimode transmit power control loop, an electronic device, and a method of adjusting a detected operating level of amplified power output from a power amplifier. The multimode transmit power control loop including a feedback path wherein a feedback path signal is coupled to a feedback detection input of the power amplifier via the feedback path. The feedback path includes a mode selection switch having a control input for selectively applying a different impedance circuit to the feedback path for switching in different attenuation levels, based upon the control input of the mode selection switch identifying one or more of multiple potential operating modes. Operation of the multimode transmit power control loop increases or decreases an operating level of amplified power output from the power amplifier, which is proportional to a present level of attenuation resulting from the particular impedance circuit being applied to the feedback path via the mode selection switch.
    Type: Grant
    Filed: October 5, 2017
    Date of Patent: January 15, 2019
    Assignee: Motorola Mobility LLC
    Inventor: Graham Alvey
  • Patent number: 10170834
    Abstract: A phased array transmitter includes a plurality of vector modulators, an in-phase/quadrature (I/Q) signal generator, and a multiphase generator. The output phases of the plurality of vector modulators, and hence the direction of transmission of the phased array transmitter, are set and controlled by adjusting both the magnitude ratios of I/Q signal pairs generated by the I/Q signal generator and applied to I and Q inputs of the plurality of vector modulators and phases of a plurality of local oscillator (LO) signal phases generated by the multiphase generator and applied to LO inputs of the plurality of vector modulators.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: January 1, 2019
    Inventor: Earl W. McCune, Jr.
  • Patent number: 10171048
    Abstract: A power amplifier according to examples includes an amplifying circuit configured to amplify an input signal, a feedback circuit configured to feedback the amplified signal to the amplifying unit, and a feedback controlling circuit configured to control a power of the fed-back signal based on a power of the input signal. The feedback controlling unit performs controlling so that the power of the fed-back signal is increased as the power of the input signal is increased.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: January 1, 2019
    Assignees: Samsung Electro-Mechanics Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Seung Hoon Kang, Gyu Suck Kim, Song Cheol Hong
  • Patent number: 10164583
    Abstract: A linearized MIMO system which includes a MIMO receiver which comprises one or more receiving units, each receiving unit comprises one or more receiving antennas and an optional MIMO spatial decoder. The linearized MIMO system also includes a linearized MIMO transmitter, which comprises a plurality of non-linear power amplifiers at respective transmission branches, where each of the non-linear power amplifiers feeds a respective antenna with an amplified signal. The linearized MIMO system also includes a MIMO spatial pre-coder for receiving an artificial data signal from a global linearizer, and based on a channel state information of the medium (medium-channel), the linearized MIMO system creates a plurality of transmission branch-signals. Each of the branch signals feeds one of the non-linear power amplifiers, respectively. The global linearizer receives a data signal and creates the artificial data signal.
    Type: Grant
    Filed: March 13, 2016
    Date of Patent: December 25, 2018
    Assignee: B.G. Negev Technologies and Applications Ltd., at Ben-Gurion University
    Inventors: Dov Wulich, Ilia Iofedov
  • Patent number: 10164581
    Abstract: A self-oscillating amplifier system is disclosed. The system comprises a pulse modulator, a switching power amplification stage and a demodulation filter. Moreover, the system comprises a compensator including a forward filter which is a high order filter including a second order pole pair and a second order zero pair. Hereby it is possible to decrease the phase turn at low frequencies for better stability and increasing the gain of the control loop within the desired bandwidth.
    Type: Grant
    Filed: November 27, 2015
    Date of Patent: December 25, 2018
    Assignee: ICEPOWER A/S
    Inventor: Kennet Skov Andersen
  • Patent number: 10158509
    Abstract: Systems and methods are provided for aligning amplitude and phase signals in a polar receiver. A receiver generates digital amplitude and phase signals representing the amplitude and phase of a modulated input signal. At least one of the digital signals is filtered using a fractional delay filter with a variable delay. The delay of the fractional delay filter is adjusted to align the amplitude and phase signals. In some embodiments, an error vector magnitude is determined by comparing in-phase and quadrature values of the signal with values corresponding to a constellation point, and the delay is adjusted based on the error vector magnitude. The fractional delay filter may be a finite impulse response filter with coefficients stored in a lookup table that correspond to different delays.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: December 18, 2018
    Assignee: Innophase Inc.
    Inventors: Yang Xu, Sara Munoz Hermoso
  • Patent number: 10158330
    Abstract: A multi-mode envelope tracking (ET) amplifier circuit is provided. The multi-mode ET amplifier circuit can operate in a low-resource block (RB) mode, a mid-RB mode, and a high-RB mode. The multi-mode ET amplifier circuit includes fast switcher circuitry having a first switcher path and a second switcher path and configured to generate an alternating current (AC) current. A control circuit activates the fast switcher circuitry in the mid-RB mode and the high-RB mode, while deactivating the fast switcher circuitry in the low-RB mode. More specifically, the control circuit selectively activates one of the first switcher path and the second switcher path in the mid-RB mode and activates both the first switcher path and the second switcher path in the high-RB mode. As a result, it is possible to improve efficiency of ET tracker circuitry and the multi-mode ET amplifier circuit in all operation modes.
    Type: Grant
    Filed: October 9, 2017
    Date of Patent: December 18, 2018
    Assignee: Qorvo US, Inc.
    Inventor: Nadim Khlat
  • Patent number: 10149244
    Abstract: An apparatus and a method for controlling power consumption of a terminal in a wireless communication system are provided. The method includes deactivating one or more of hardware components for signal reception in a transmission interval if there is no data to be received in the transmission interval, and receiving a control signal by activating all the components in a next transmission interval.
    Type: Grant
    Filed: February 11, 2014
    Date of Patent: December 4, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Tae-Yoon Kim, Min-Goo Kim, Seong-Woo Ahn, Jong-Han Lim, Chae-Man Lim, Young-Seok Jung
  • Patent number: 10141901
    Abstract: Disclosed are devices and methods for improving power added efficiency and linearity of radio-frequency power amplifiers implemented in flip-chip configurations. In some embodiments, a harmonic termination circuit can be provided so as to be separate from an output matching network configured to provide impedance matching at a fundamental frequency. The harmonic termination circuit can be configured to terminate at a phase corresponding to a harmonic frequency of the power amplifier output. Such a configuration of separate fundamental matching network and harmonic termination circuit allows each to be tuned separately to thereby improve performance parameters such as power added efficiency and linearity.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: November 27, 2018
    Assignee: Skyworks Solutions, Inc.
    Inventors: Guohao Zhang, Hardik Bhupendra Modi, Jaydutt Jagdish Joshi, Bhuvaneshwaran Vijayakumar, Dinhphuoc Vu Hoang
  • Patent number: 10141894
    Abstract: A circuit includes a first amplifier path comprising a first amplifier, MA, a second amplifier path comprising a cascode device and a second amplifier, MB, a node defined by a source of the cascode device and a drain of the second amplifier, MB, and a capacitance coupled between the node and a source of the second amplifier, MB.
    Type: Grant
    Filed: July 3, 2017
    Date of Patent: November 27, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Karthikeya Aruppukottai Boominathan, Krishnaswamy Thiagarajan, Mahim Ranjan
  • Patent number: 10128800
    Abstract: A distortion compensation apparatus include: a feedback unit that generates a feedback signal containing a first frequency component in which a plurality of odd-order distortions are superimposed and a second frequency component in which a plurality of even-order distortions are superimposed according to output of a power amplifier which amplifies a transmission signal; and a signal processor that separates the first frequency component and the second frequency component from the generated feedback signal and performs signal processing.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: November 13, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Tomoya Ota, Toshio Kawasaki
  • Patent number: 10122404
    Abstract: A radio frequency (RF) front end chip in a phased array antenna panel for transmitting a modulated circularly-polarized signal is disclosed. The RF front end chip includes an oscillator providing an angular speed modulation signal to a quadrature generation block, the quadrature generation block providing an in-phase signal and a quadrature signal based on the angular speed modulation signal, a first amplifier receiving the in-phase signal and a data signal, and providing a modulated horizontally-polarized signal, and a second amplifier receiving the quadrature signal and the data signal, and providing a modulated vertically-polarized signal, where a modulated circularly-polarized signal is generated based on the modulated horizontally-polarized signal and the modulated vertically-polarized signal. The angular speed modulation signal controls an angular speed of the modulated circularly-polarized signal. The data signal is encoded by the angular speed modulation signal.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: November 6, 2018
    Assignee: Movandi Corporation
    Inventors: Seunghwan Yoon, Alfred Grau Besoli, Ahmadreza Rofougaran, Farid Shirinfar, Maryam Rofougaran, Sam Gharavi, Michael Boers
  • Patent number: 10116348
    Abstract: A high-frequency power amplifying module is provided for a communication device that simultaneously uses at least a radio wave in a first band and a radio wave in a second band, and a first high-frequency power amplifier for the first band and a second high-frequency power amplifier for the second band are mounted. The first band and the second band are frequency bands that produce intermodulation distortion of a frequency included in the receive frequency band of the second band, due to a transmit frequency of the first band received by the first high-frequency power amplifier and a transmit frequency of the second band received h the second high-frequency power amplifier. The second high-frequency power amplifier includes a filter that blocks a signal at the transmit frequency of the first band.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: October 30, 2018
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Hidenori Obiya, Shinya Hitomi
  • Patent number: 10110315
    Abstract: Aspects of a method and system for high-speed, low-power optical communications are provided. In one embodiment, a system for optical communications comprises a digital-to-analog converter (DAC), a driver, and a transmit optical subsystem. The DAC is operable to receive a digital code of a plurality of digital codes and output an analog current signal having an analog current level of a plurality of analog current levels. The driver is operable to condition the analog current signal output from the digital-to-analog converter. The transmit optical subsystem is operable to generate an optical power signal from the conditioned analog current signal. A mapping between the plurality of digital codes and the plurality of analog current levels is dynamically controlled according to one or more characteristics of the optical power signal. The one or more characteristics comprise or a symbol amplitude sensitivity and/or a nonlinearity that may be temperature dependent.
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: October 23, 2018
    Assignee: Maxlinear, Inc.
    Inventor: Curtis Ling
  • Patent number: 10107901
    Abstract: An ultrasound imaging system includes a plurality of processing chains (2061, . . . , 206K) for a plurality of transducer element channels (1081, . . . , 108K). A processing chain of the plurality of processing chains, includes: a phase rotation processor (1141, . . . , 114K) that focuses an N-bit digital representation, of an analog RF signal received on the corresponding transducer element channel, through phase rotation through phase additions or subtractions, and outputs a focused N-bit quantized value, where N is a predetermined positive integer.
    Type: Grant
    Filed: August 14, 2014
    Date of Patent: October 23, 2018
    Assignee: Sound Technology Inc.
    Inventors: Drake A. Guenther, Michael Fuller, Travis Blalock
  • Patent number: 10097141
    Abstract: An apparatus to apply frequency selective digital predistortion (DPD) to a power amplifier (PA) circuit is disclosed. The apparatus comprises a first transformation circuit configured to receive a PA input comprising a quantity indicative of an input signal of the PA circuit and process the PA input by applying a first predetermined weighted function, to form a processed PA input, and a second transformation circuit configured to receive a PA output comprising a quantity indicative of an output signal of the PA circuit and process the PA output by applying a second predetermined weighted function, to form a processed PA output. The apparatus further comprises a coefficient computation circuit configured to receive the processed PA input and the processed PA output; and estimate distortion coefficients, to be utilized for predistorting the input signal of the PA circuit, based on the processed PA input and the processed PA output.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: October 9, 2018
    Assignee: Intel Corporation
    Inventors: Itay Almog, Michael Kerner, Avi Gazneli
  • Patent number: 10097142
    Abstract: An embodiment of the invention is a time-delay invariant predistortion approach to linearize power amplifiers in wireless RF transmitters. The predistortion architecture is based on the stored-compensation or memory-compensation principle by using a combined time-delay addressing method, and therefore, the architecture has an intrinsic, self-calibrating time-delay compensation function. The predistortion architecture only uses a lookup table to conduct both the correction of non-linear responses of a power amplifier and the compensation of any time-delay effects presented in the same system. Due to the time-delay invariant characteristic, the predistortion design has a wider dynamic range processing advantage for wireless RF signals, and therefore can be implemented in multi-carrier and multi-channel wireless systems.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: October 9, 2018
    Assignee: Dali Wireless, Inc.
    Inventors: Dali Yang, Jia Yang
  • Patent number: 10075310
    Abstract: An adaptive linearizer system includes an adaptive linearizer circuit that is configured to pre-distort an input signal based on one or more control signals to generate a pre-distorted signal, and a non-linear high-power amplifier (HPA) having non-linear characteristics that is coupled to the adaptive linearizer circuit. The nonlinear HPA amplifies the pre-distorted signal. The pre-distortion characteristics of the adaptive linearizer circuit provide for countering the non-linear characteristics of the non-linear HPA and compensating a non-linearity of the non-linear HPA.
    Type: Grant
    Filed: August 26, 2015
    Date of Patent: September 11, 2018
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventors: Marc Ronald Bjorkman, Novellone Rozario, Jason Michael Teixeira, Douglas V. McKinnon, Kim Thomas Lancaster
  • Patent number: 10056863
    Abstract: A technique for determining a time alignment (TA) error in a circuitry is provided. One or few measurement cycles can be utilized for a closed-loop TA alignment, e.g., for envelope tracking in a transmitter. As to a method aspect of the technique, the amplitudes of a first signal and a second signal are determined. A first measure is computed that is indicative of a relative amplitude error, and a second measure is computed that is indicative of a variation of at least one of the amplitudes. The TA error is determined by correlating the first and second measures.
    Type: Grant
    Filed: January 5, 2015
    Date of Patent: August 21, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventor: Christoph Loeffler
  • Patent number: 10044334
    Abstract: A power amplifier gain attenuation circuit includes: a gain attenuation (reduction) circuit configured to receive an input signal, an external drive signal and a bias voltage, and output a secondary input signal after attenuating the input signal depending on the drive signal and bias voltage; an amplifier including: a bias input terminal configured to receive a bias voltage; a signal input terminal configured to receive a secondary input signal, and an output terminal configured to output a gained output signal. The power amplifier gain attenuation circuit can reduce a gain effectively, and the amount of phase jump caused by the attenuation is quite small.
    Type: Grant
    Filed: December 24, 2017
    Date of Patent: August 7, 2018
    Assignee: LANSUS TECHNOLOGIES INC.
    Inventors: Hua Long, Liyang Zhang, Zhenjuan Cheng, Dongjie Tang, Qian Zhao
  • Patent number: 10039056
    Abstract: An apparatus and a method for controlling power consumption of a terminal in a wireless communication system are provided. The method includes deactivating one or more of hardware components for signal reception in a transmission interval if there is no data to be received in the transmission interval, and receiving a control signal by activating all the components in a next transmission interval.
    Type: Grant
    Filed: February 11, 2014
    Date of Patent: July 31, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Tae-Yoon Kim, Min-Goo Kim, Seong-Woo Ahn, Jong-Han Lim, Chae-Man Lim, Young-Seok Jung
  • Patent number: 10038463
    Abstract: Digital pre-distortion is performed on a received signal using a set of pre-distortion coefficients to produce a digital pre-distorted signal. The digital pre-distorted signal is converted to an analog signal, which is amplified to produce a transmission output signal. The transmission output signal is converted to a digital feedback signal. A plurality of fractional delay filters is applied to the digital feedback signal to obtain a plurality of fractional delay compensated (FDC) candidates, and gain compensation is applied to each of the plurality of FDC candidates to obtain a plurality of gain and fractional delay compensated (XFT) candidates. The digital pre-distorted signal is used as a reference signal, and the XFT candidates and the reference signal are used to select a selected XFT candidate of the plurality of XFT candidates. The selected XFT candidate is used to generate the set of pre-distortion coefficients.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: July 31, 2018
    Assignee: NXP USA, Inc.
    Inventors: Jayakrishnan Cheriyath Mundarath, Zhiyu Cheng, Leo Dehner
  • Patent number: 10033413
    Abstract: Various examples are directed to systems and methods for digital predistortion (DPD). A linear digital predistortion (DPD) circuit may be programmed to generate a pre-distorted signal linear component based at least in part on a complex baseband signal. A nonlinear DPD circuit may be programmed to generate a pre-distorted signal nonlinear component based at least in part on the complex baseband signal. A mixer circuit programmed to generate a pre-distorted signal based at least in part on the pre-distorted signal linear component and the pre-distorted signal nonlinear component.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: July 24, 2018
    Assignee: Analog Devices Global
    Inventor: Patrick Pratt
  • Patent number: 10027404
    Abstract: A high throughput satellite communication system and method of satellite communication that provide loopback capability and increased throughput is disclosed. The satellite communication system and method of satellite communication utilize pre-distortion based on remotely estimated characteristics of a satellite transponder's power amplifier (PA). The pre-distortion is applied to the hub modulator's constellation.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: July 17, 2018
    Assignee: GLOBAL EAGLE ENTERTAINMENT INC.
    Inventors: Abel Avellan, Federico Fawzi, Sriram Jayasimha, Jyothendar Paladugula, Kovelapudi Prasad
  • Patent number: 10021582
    Abstract: A delay estimation method for a multiple input multiple output communications system, includes: calculating, by a receiver, a channel response matrix of a Multiple input multiple output MIMO communications system, where there are n transmit channels and m receive channels in the MIMO communications system, n?2, m?2, and the channel response matrix includes channel responses of n*m sub-channels; calculating, by the receiver, an integer delay, relative to a reference sub-channel, of each of the n*m sub-channels according to the channel response matrix, where the reference sub-channel is any sub-channel in the n*m sub-channels; calculating, by the receiver, fraction delays of the n*m sub-channels according to the channel response matrix; and separating out, by the receiver, delays of the m receive channels according to delays of the n*m sub-channels.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: July 10, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventor: Rui Lyu
  • Patent number: 10014825
    Abstract: Provided is a receiver including an oscillator (OSC) configured to generate an oscillation signal based on a radio signal, a clocked envelope detector (ED) configured to detect an envelope of the oscillation signal and hold a peak value of the envelope during a time interval, and an analog-to-digital converter (ADC) configured to convert the peak value of the envelope into a digital signal.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: July 3, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Seong Joong Kim, Sang Joon Kim
  • Patent number: 10008987
    Abstract: A low noise amplifier (LNA) reduces matching and switch noise. The LNA includes a main radio frequency signal path, an auxiliary radio frequency signal path and a phase shifter. The main path includes a first transistor and an inductor. The inductor is positioned between an input port of the LNA and the first transistor. The first transistor receives an input radio frequency signal via the inductor and provides a first amplified signal based on the input radio frequency signal. The auxiliary radio frequency signal path provides a second amplified signal for a noise cancellation mode based on the input radio frequency signal. The phase shifter applies a phase shift to an output signal of the LNA based on the first amplified signal and the second amplified signal.
    Type: Grant
    Filed: May 1, 2017
    Date of Patent: June 26, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Serkan Sayilir, Chuan Wang, Li-chung Chang, Kevin Hsi Huai Wang
  • Patent number: 9998156
    Abstract: A controller can include a signal generator configured to provide an input signal to a modulator. The controller can be configured to generate a modulator compensation parameter in response to a modulated feedback signal corresponding to an output of the modulator. The controller can also be configured to generate a power amplifier predistortion signal in response to an amplified feedback signal corresponding to an output of a power amplifier coupled to the modulator.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: June 12, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Junming Li
  • Patent number: 9998158
    Abstract: A method and apparatus for intermodulation product (IMP) cancellation. In one embodiment, the method comprises: acquiring copies of source signals that create IMPs in a passband of interest; creating copies of the IMPs for use as IMP cancellation signals by either multiplying the source signals together as a series of digital samples such that the multiplied signals create a near real and continuous time copy of the IMPs or creating a sum of the source signals in near real and continuous time and convolving the sum of the source signals with a mathematical model to effectively multiply the signals together to create a copy of the IMPs; adjusting one or both of phase and amplitude of the copies; and using the copies to cancel the IMPs inband of the passband of interest.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: June 12, 2018
    Assignee: FINESSE WIRELESS, INC.
    Inventor: Francis J. Smith
  • Patent number: 9991915
    Abstract: A predistortion system for correcting a distortion of a distorting component is provided. It comprises a signal generator, adapted to generate a first signal based upon a reference signal, the distorting component, adapted to generate a second signal, based upon the first signal, and an iterative predistortion device, adapted to determine a compensated signal based upon the second signal and the reference signal. The signal generator is adapted to use the compensated signal as reference signal in further iterations after a first iteration. The predistortion system moreover comprises a predistortion calculation device, adapted to determine a predistortion function based upon the reference signal and the first signal. The signal generator is then adapted to generate the first signal based upon the predistortion function for further reference signals.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: June 5, 2018
    Assignee: ROHDE & SCHWARZ GMBH & CO. KG
    Inventor: Martin Weiss
  • Patent number: 9991860
    Abstract: An apparatus for controlling the gain and phase of an input signal input to a power amplifier comprises a gain control loop configured to control the gain of the input signal based on power levels of the input signal and an amplified signal output by the power amplifier, to obtain a predetermined gain of the amplified signal, and a phase control loop configured to obtain an error signal related to a phase difference between a first signal derived from the input and a second signal derived from the amplified signal, and control the phase based on the error signal, to obtain a predetermined phase of the amplified signal. The phase control loop delays the first signal such that the delayed first signal and the second signal used to obtain the error signal correspond to the same part of the input signal. The apparatus may be included in a satellite.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: June 5, 2018
    Assignee: Astrium Limited
    Inventor: Martin Goss
  • Patent number: 9979422
    Abstract: An adaptive digital pre-distortion system includes a transmitting module and a receiving module. The transmitting module is configured to receive a first signal and includes a modulator, pre-distortion module, and transmitting circuit. The pre-distortion module is coupled to the modulator to perform a pre-distortion operation in accordance with the first modulation signal and generate a first pre-distortion signal. The transmitting circuit generates a first transmitted signal in accordance with the first pre-distortion signal. The receiving module is configured to receive the first transmitted signal and includes a receiving circuit, demodulator, and prediction module.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: May 22, 2018
    Assignee: NATIONAL CHUNG SHAN INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Yih-Min Chen, Chin-Kun Lin, Ting-Yu Lai, Cheih Tu, Chen-Chia Ku, Chien-Te Yu
  • Patent number: 9979461
    Abstract: In a mobile communication service system, repeaters can be installed to cover shadow areas where it may otherwise be difficult to transmit and/or receive mobile signals. A radio frequency (RF) repeater that may select between an interference cancellation device and a software-defined radio (SDR) device is provided. The RF repeater can select use of the interference cancellation device in environments or situations that are relatively less complex, and can switch to use of the SDR device instead for environments or situations where more complex frequency processing may be needed and where such frequency processing may be prioritized over interference cancellation to provide better or more effective signal transmissions.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: May 22, 2018
    Assignee: ADVANCED RF TECHNOLOGIES, INC.
    Inventor: Young-Hoon Ko
  • Patent number: 9979374
    Abstract: An analog time delay filter circuit including a first delay circuit block arranged in a modular layout, having a first time delay filter, a first input, a first output, and first and second pass-throughs; a second delay circuit block arranged in the same modular layout, having a second time delay filter, a second input, a second output, and third and fourth pass-throughs; and an interposer circuit block that electrically couples the second input to the first pass-through and the second output to the second pass-through.
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: May 22, 2018
    Assignee: Kumu Networks, Inc.
    Inventors: Wilhelm Steffen Hahn, Alfred Riddle, Ernie Landi
  • Patent number: 9973221
    Abstract: The present document discloses an apparatus and method for nonlinear system distortion correction. The apparatus includes: apparatus for nonlinear system distortion correction including: a robustness signal source generator, arranged to generate a robustness signal provided to an adaptive device; the adaptive device, arranged to collect a main link signal output by a signal generator and a feedback signal returned by the main link signal via a feedback link, and generate a correction parameter according to the main link signal, the feedback signal and the robustness signal; and a pre-corrector, arranged to according to the correction parameter perform pre-correction processing on the main link signal output by the signal generator.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: May 15, 2018
    Assignee: ZTE Corporation
    Inventors: Lei Wang, Zhengjian Dai, Weiming Pan, Zhe Zhang, Mei Huang
  • Patent number: 9948260
    Abstract: A wireless receiver includes an antenna receiving a right-handed circularly polarized (RHCP) signal and a left-handed circularly polarized (LHCP) signal, a first amplifier and a second amplifier coupled to the antenna, an intermediate summer coupled to the first and second amplifiers and providing a first intermediate signal, an intermediate subtractor coupled to the first and second amplifiers and providing a second intermediate signal. The wireless receiver also includes a V-signal summer providing a V-component output based on a sum of the first intermediate signal and the second intermediate signal, and an H-signal subtractor providing an H-component output based on a difference between the first intermediate signal and the second intermediate signal. The wireless receiver is configured to provide the V-component output and the H-component output without using a phase shifter.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: April 17, 2018
    Assignee: Movandi Corporation
    Inventors: Sam Gharavi, Ahmadreza Rofougaran, Farid Shirinfar, Seunghwan Yoon, Alfred Grau Besoli, Michael Boers, Maryam Rofougaran
  • Patent number: 9948332
    Abstract: A remote radio head unit (RRU) system is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier inside the RRU. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by a wideband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, embodiments of the present invention can compensate for the nonlinearities as well as memory effects of the power amplifier systems and also improve performance, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers, multi-frequency bands and multi-channels.
    Type: Grant
    Filed: May 4, 2015
    Date of Patent: April 17, 2018
    Assignee: Dali Systems Co. Ltd.
    Inventors: Wan-Jong Kim, Kyoung-Joon Cho, Shawn Patrick Stapleton, Ying Xiao
  • Patent number: 9929700
    Abstract: A distortion compensation circuit includes a low-pass circuit to block the passage of two-wave RF signals and intermodulation distortions and to allow the passage of a difference-frequency signal. The low-pass circuit is connected between a signal path and an intermodulation distortion adjustment circuit.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: March 27, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroshi Otsuka, Yuji Komatsuzaki, Jun Nishihara, Hifumi Noto, Koji Yamanaka
  • Patent number: 9923740
    Abstract: A high-speed serial interface includes a transmitter having an output module with settings that select an output impedances of the output module and a tuning value for the output impedance, and a receiver having a plurality of compensation modules each to provide a selectable level of equalization to a data bitstream from the transmitter, and a control module that directs the transmitter to successively select each of the tuning values, that directs the compensation modules, for each tuning value, to successively select each of the levels of equalization, that evaluates an indication of a performance level of the receiver for each of the successively selected levels of equalization and for each of the tuning values, and that selects a particular tuning value based upon the indications of the performance level of the receiver.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: March 20, 2018
    Assignee: DELL PRODUCTS, LP
    Inventors: Stuart Allen Berke, Bhyrav M. Mutnury
  • Patent number: 9924459
    Abstract: A method of determining a transmission time of a packet in a mobile device according to the present disclosure may include: if a request for the transmission of a present packet from at least one operated application is detected, identifying whether it is possible to delay a transmission time of the present packet; when it is possible to delay the transmission time of the present packet, calculating a power gain generated as the transmission time of the present packet is delayed; and determining whether the transmission time of the present packet will be delayed according to the calculated power gain.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: March 20, 2018
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Daedong Park, Sungju Huh, Seongsoo Hong, Yong-Seok Park, Ok-Seon Lee, Young-Ki Hong
  • Patent number: 9913194
    Abstract: An efficient baseband predistortion linearization method using effective multiplexing modulation technique such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. The present invention is based on the method of piecewise pre-equalized lookup table based predistortion, which is a cascade of a lookup table predistortion and piecewise pre-equalizers.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: March 6, 2018
    Assignee: Dali Wireless, Inc.
    Inventors: Wan-Jong Kim, Kyoung Joon Cho, Jong Heon Kim, Shawn Patrick Stapleton
  • Patent number: 9888416
    Abstract: A multi-channel predistortion method and apparatus are disclosed. The technical method provided in the embodiment of the present invention includes: determining a channel index of a current channel to be processed; performing handover to the current channel according to a determined channel index; collecting forward data and reverse data of the current channel, and estimating a predistortion coefficient; and performing predistortion compensation on forward data of each channel according to a corresponding predistortion coefficient. In the embodiments of the present invention, by using a jumping polling mode on a channel time, the predistortion efficiency under multiple channels is improved. In addition, by means of all channels or a plurality of channels sharing N power levels, the resource utilization rate is improved.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: February 6, 2018
    Assignee: ZTE Corporation
    Inventors: Yijun Duan, Weiming Pan