公开(公告)号：US20180331662A1

公开(公告)日：2018-11-15

申请号：US15975783

申请日：2018-05-10

Applicant: MEDIATEK INC.

Inventor： Ching-Shyang Maa ,  Chun-Hsien Peng ,  Hua-Lung Yang ,  I-No Liao ,  Chen-Jui Hsu ,  Jen-Yang Liu

IPC: H03F1/32 ,  H03F3/21 ,  H03F3/19 ,  H03F1/30

CPC classification number: H03F1/3258 ,  H03F1/30 ,  H03F3/19 ,  H03F3/21 ,  H03F2200/451 ,  H03F2200/468 ,  H03F2201/3209 ,  H03F2201/3224 ,  H03F2201/3233

Abstract: A method of reducing memory effect of a power amplifier (PA), for a look-up table (LUT) based memory digital pre-distortion (DPD) circuit of an electronic device is disclosed. The method comprises generating a pre-distorted signal according to a LUT including parameters of an input signal amplitude and an input signal delay associated with a bandwidth of a signal inputted to the memory DPD circuit, and outputting the pre-distorted signal to the PA for improving the nonlinearity of the PA.

公开(公告)号：US09929702B2

公开(公告)日：2018-03-27

申请号：US15265173

申请日：2016-09-14

Applicant: Qorvo US, Inc.

Inventor： Wenlong Ma ,  Barry Jia-Fu Lin

IPC: H03F1/32 ,  H03F3/21 ,  H03F3/191

CPC classification number: H03F1/3241 ,  H03F1/3282 ,  H03F3/191 ,  H03F3/21 ,  H03F2200/225 ,  H03F2200/411 ,  H03F2200/451 ,  H03F2200/541 ,  H03F2200/552 ,  H03F2200/555 ,  H03F2201/3209

Abstract: A multi-stage Radio Frequency (RF) power amplifier is presented herein. According to one embodiment, the amplifier comprises: a first amplification stage configured to amplify an input signal to provide a first output signal having a phase distortion; a second amplification stage having an input and configured to amplify the first output signal that is received at the input to provide a second output signal, wherein the second output signal has a carrier frequency (FC) modulated by a signal content (S) having a signal content bandwidth (FS); and a resonant circuit comprising an inductor and a capacitor and having a resonant frequency (FR), the resonant circuit coupled to the input of the second amplification stage and compensating for the phase distortion caused by the first amplification stage at frequencies within the signal content bandwidth FS, wherein the resonant frequency FR is less than the signal content bandwidth FS.

公开(公告)号：US09819318B2

公开(公告)日：2017-11-14

申请号：US13333422

申请日：2011-12-21

Applicant: Chunlong Bai ,  Chunyun Jian ,  Edward Sich

Inventor： Chunlong Bai ,  Chunyun Jian ,  Edward Sich

IPC: H03F3/24 ,  H03F1/32 ,  H03F3/195 ,  H04B1/04

CPC classification number: H03F3/245 ,  H03F1/3241 ,  H03F1/3247 ,  H03F1/3258 ,  H03F3/195 ,  H03F2201/3209 ,  H03F2201/3212 ,  H03F2201/3224 ,  H04B1/0475 ,  H04B2001/0425

Abstract: Systems and methods for compensating for non-linearity of a non-linear subsystem using predistortion are disclosed. In one embodiment, a system includes a non-linear subsystem and a predistorter configured to effect predistortion of an input signal of the non-linear subsystem such that the predistortion compensates for a non-linear characteristic of the non-linear subsystem. In addition, the system includes a narrowband filter that filters a feedback signal that is representative of an output signal of the non-linear subsystem to provide a filtered feedback signal, and an adaptor that adaptively configures the predistorter based on the filtered feedback signal and a reference signal that is representative of an input signal of the non-linear subsystem. By utilizing the filtered feedback signal, rather than the feedback signal, a complexity, and therefore, cost of the adaptor is substantially reduced.

公开(公告)号：US09768743B1

公开(公告)日：2017-09-19

申请号：US14730142

申请日：2015-06-03

Applicant: Marvell International Ltd.

Inventor： Sai-Wang Tam ,  Philip Godoy ,  Ming He ,  Renaldi Winoto

IPC: H03F3/21 ,  H03F1/32 ,  H03F3/26

CPC classification number: H03F1/223 ,  H03F1/301 ,  H03F1/3205 ,  H03F3/245 ,  H03F2200/18 ,  H03F2200/186 ,  H03F2200/555 ,  H03F2201/3209

Abstract: A circuit includes a reference voltage circuit, a filter circuit configured to receive an output of the reference voltage circuit, and a voltage follower configured to receive an output of the filter circuit and generate a bias voltage. The filter circuit is configured to combine signals on a reference ground with the output of the reference voltage circuit. A method of providing a bias voltage includes generating a reference voltage using a reference voltage circuit, filtering the reference voltage to generate a second voltage using a filter circuit, and generating the bias voltage according to the second voltage using a voltage follower circuit. Filtering the reference voltage includes combining a fluctuation of the reference ground with the reference voltage.

公开(公告)号：US20170005627A1

公开(公告)日：2017-01-05

申请号：US14790364

申请日：2015-07-02

Applicant: Xilinx, Inc.

Inventor： Hongzhi Zhao ,  Christopher H. Dick

IPC: H03F1/32 ,  H03F3/24 ,  H04B1/04 ,  H03F3/189

CPC classification number: H03F1/3247 ,  H03F1/3252 ,  H03F1/3258 ,  H03F3/189 ,  H03F3/195 ,  H03F3/24 ,  H03F3/245 ,  H03F2201/3209 ,  H03F2201/3215 ,  H03F2201/3224 ,  H03F2201/3233 ,  H04B1/0475 ,  H04B2001/0425

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.

Abstract translation: 装置一般涉及预处理输入信号。 在该装置中，第一数字预失真模块和第二数字预失真模块用于接收用于分别提供第一预失真信号和第二预失真信号的输入信号。 组合器用于组合第一预失真信号和第二预失真信号以提供输出信号。 第一数字预失真模块包括移动平均块，用于接收用于提供移动平均信号的输入信号。 第一数字预失真模块还包括用于接收输入信号的数字预失真器和用于提供第一预失真信号的移动平均信号。

公开(公告)号：US20160329927A1

公开(公告)日：2016-11-10

申请号：US15108108

申请日：2014-12-24

Applicant: DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD

Inventor： Jun Xiong ,  Xinmin Wang ,  Tao Duan ,  Jingyi Wang

IPC: H04B1/62 ,  H03F3/24 ,  H03F1/32 ,  H04B1/04

CPC classification number: H04B1/62 ,  H03F1/3241 ,  H03F1/3247 ,  H03F1/3258 ,  H03F3/24 ,  H03F3/245 ,  H03F2200/198 ,  H03F2201/3209 ,  H03F2201/3224 ,  H03F2201/3227 ,  H03F2201/3233 ,  H04B1/04 ,  H04B1/0475 ,  H04B2001/0416 ,  H04B2001/0425 ,  H04L25/49 ,  H04L27/367 ,  H04L27/368

Abstract: The present application relates to the field of digital pre-distortion processing. Disclosed in an embodiment of the present application are a pre-distortion parameter obtaining method and pre-distortion system for simplifying calculating complexity of a model while achieving good signal processing effect. The method comprises: after the beginning of periodic filtering processing, obtaining a pre-distorted signal after pre-distortion processing and a first feedback signal after power amplification (S101); obtaining a second feedback signal by eliminating the rated linear gain of the first feedback signal (S102); determining a pre-distortion parameter according to a matrix formed by the second feedback signal and a matrix formed by the pre-distorted signal (S103); updating the pre-distortion parameter index table according to the determined pre-distortion parameter (104).

Abstract translation: 本申请涉及数字预失真处理领域。 在本申请的实施例中公开了一种用于在实现良好的信号处理效果的同时简化模型的计算复杂度的预失真参数获取方法和预失真系统。 该方法包括：在周期性滤波处理开始之后，在预失真处理之后获得预失真信号和功率放大后的第一反馈信号（S101）; 通过消除第一反馈信号的额定线性增益来获得第二反馈信号（S102）; 根据由所述第二反馈信号形成的矩阵和由所述预失真信号形成的矩阵来确定预失真参数（S103）; 根据确定的预失真参数（104）更新预失真参数索引表。

公开(公告)号：US09484868B2

公开(公告)日：2016-11-01

申请号：US14890940

申请日：2014-06-02

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Masahiko Onishi

IPC: H03F1/26 ,  H03F1/32 ,  H03F3/24 ,  H03F3/19 ,  H03F3/21

CPC classification number: H03F1/3241 ,  H03F1/0216 ,  H03F1/3247 ,  H03F3/19 ,  H03F3/21 ,  H03F3/24 ,  H03F2200/451 ,  H03F2201/3209 ,  H03F2201/3215 ,  H03F2201/3224 ,  H03F2201/3233

Abstract: Distortion is effectively reduced in a wide frequency band of an output signal from an amplifier. A distortion compensation apparatus includes: a distortion compensation processing section that performs a distortion compensation process on an input signal to the amplifier, based on a first amplifier model of the amplifier, and output a compensated signal; a signal generation section that receives the compensated signal and a first digital monitor signal, and generates a second digital monitor signal; and an estimation section that estimates the first amplifier model, based on the compensated signal and the second digital monitor signal. The first digital monitor signal is a signal generated by subjecting an analog monitor signal obtained by monitoring an output signal from the amplifier, to analog-to-digital conversion. A monitor band of the first digital monitor signal is narrower than a frequency band of the compensated signal. A frequency band of the second digital monitor signal is wider than the monitor band of the first digital monitor signal, and includes signal components obtained by restoring signal components outside the monitor band, among signal components included in the analog monitor signal. The signal generation section restores the signal components outside the monitor band among the signal components included in the analog monitor signal, based on the compensated signal and the first digital monitor signal.

Abstract translation: 来自放大器的输出信号的宽频带中的失真被有效地减小。 失真补偿装置包括：失真补偿处理部，其基于放大器的第一放大器模型对放大器的输入信号进行失真补偿处理，并输出补偿信号; 信号生成部，其接收补偿信号和第一数字监视信号，生成第二数字监视信号; 以及估计部，其基于补偿信号和第二数字监视信号来估计第一放大器模型。 第一数字监视信号是通过对通过监视来自放大器的输出信号而获得的模拟监视信号进行模数转换而产生的信号。 第一数字监视信号的监视频带比补偿信号的频带窄。 第二数字监视信号的频带比第一数字监视信号的监视频带宽，并且包括通过在模拟监视信号中包括的信号分量之中恢复监视频带外的信号分量而获得的信号分量。 信号生成部基于补偿信号和第一数字监视信号，恢复包含在模拟监视信号中的信号分量之外的监视频带外的信号分量。

公开(公告)号：US09337781B2

公开(公告)日：2016-05-10

申请号：US14101256

申请日：2013-12-09

Applicant: KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS

Inventor： Oualid Hammi

IPC: H03F3/21 ,  H03F3/19 ,  H03F1/26 ,  H03F1/32 ,  H03F3/189 ,  H03F3/24

CPC classification number: H03F1/3247 ,  H03F1/3258 ,  H03F3/189 ,  H03F3/24 ,  H03F2200/451 ,  H03F2201/3209 ,  H03F2201/3212 ,  H03F2201/3224 ,  H03F2201/3233

Abstract: The augmented twin nonlinear two-box modeling and predistortion method for power amplifiers and transmitters provides power amplifier distortion modeling and predistortion linearization. A memoryless nonlinearity is combined with a memory polynomial function that includes cross-terms. The method can utilize an augmented forward twin-nonlinear two-box model, an augmented reverse twin-nonlinear two-box model, or alternatively, an augmented parallel twin-nonlinear two-box model. The present two-box models are validated in modeling and predistortion applications. Measurement results demonstrate the superiority of the present two-box models with respect to conventional state of the art models. The present two-box models lead to better accuracy with reduced complexity.

Abstract translation: 功率放大器和发射机的增强双非线性双箱建模和预失真方法提供功率放大器失真建模和预失真线性化。 无记忆非线性与包含交叉项的存储多项式函数组合。 该方法可以利用增强的前向双非线性双箱模型，增强的反向双非线性双箱模型，或者增加的并行双非线性双箱模型。 目前的双箱型号在建模和预失真应用中得到验证。 测量结果证明了现有的双箱模型相对于现有技术模型的优越性。 目前的双盒型号导致更好的精度，降低了复杂性。

公开(公告)号：US09209753B2

公开(公告)日：2015-12-08

申请号：US14552056

申请日：2014-11-24

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yuxiang Xiao ,  Erni Zhu ,  Anding Zhu

IPC: H04K1/02 ,  H04L25/03 ,  H04L25/49 ,  H03F1/32 ,  H03F3/19 ,  H03F3/24 ,  H04B1/04

CPC classification number: H03F1/3247 ,  H03F1/3241 ,  H03F1/3252 ,  H03F1/3258 ,  H03F3/19 ,  H03F3/24 ,  H03F3/245 ,  H03F2200/36 ,  H03F2200/39 ,  H03F2200/451 ,  H03F2201/3209 ,  H03F2201/3215 ,  H03F2201/3224 ,  H03F2201/3227 ,  H04B1/0475 ,  H04B2001/0408 ,  H04B2001/0425 ,  H04L27/368

Abstract: A predistortion correction method, a predistortion correction apparatus, a transmitter, and a base station are provided. The method includes: performing, based on a digital predistortion model, non-linear processing on an input transmit signal to obtain higher-order distortion time-domain signals; and obtaining, after performing processing on the higher-order distortion time-domain signals, a predistortion signal to be input to a power amplifier, where a process of converting the higher-order distortion time-domain signals to the predistortion signal includes bandwidth limitation processing, so that the predistortion signal to be input to the power amplifier is a predistortion signal within a preset bandwidth. Embodiments of the present invention can ensure predistortion accuracy, and can also reduce a requirement for a bandwidth and a sampling rate of a feedback channel, thereby reducing a predistortion cost.

Abstract translation: 提供了预失真校正方法，预失真校正装置，发射机和基站。 该方法包括：基于数字预失真模型对输入发射信号进行非线性处理，以获得更高阶失真时域信号; 在对高阶失真时域信号执行处理之后，获得要输入到功率放大器的预失真信号，其中将高阶失真时域信号转换为预失真信号的处理包括带宽限制处理 ，使得要输入到功率放大器的预失真信号是预设带宽内的预失真信号。 本发明的实施例可以确保预失真精度，并且还可以减少对反馈信道的带宽和采样率的要求，从而降低预失真成本。

公开(公告)号：US08982992B2

公开(公告)日：2015-03-17

申请号：US13701415

申请日：2012-10-26

Applicant: LSI Corporation

Inventor： Kameran Azadet ,  Albert Molina ,  Joseph H. Othmer ,  Meng-Lin Yu ,  Ramon Sanchez Perez

IPC: H04L25/49 ,  G06F5/01 ,  H04B1/04 ,  H04L1/00 ,  H04L27/233 ,  H04B1/62 ,  G06F9/30 ,  H04L25/02 ,  H04L25/03 ,  H03M3/00

CPC classification number: G06F9/3001 ,  G06F5/01 ,  G06F9/30036 ,  G06F17/15 ,  H03F1/0288 ,  H03F1/3241 ,  H03F1/3258 ,  H03F3/189 ,  H03F3/24 ,  H03F2200/336 ,  H03F2201/3209 ,  H03F2201/3212 ,  H03F2201/3224 ,  H03F2201/3233 ,  H03H17/06 ,  H03M3/30 ,  H04B1/0003 ,  H04B1/0475 ,  H04B1/62 ,  H04B2001/0408 ,  H04L1/0054 ,  H04L25/02 ,  H04L25/03 ,  H04L25/03178 ,  H04L25/03216 ,  H04L25/4917 ,  H04L27/2334

Abstract: Block-based crest factor reduction (CFR) techniques are provided. An exemplary block-based crest factor reduction method comprises obtaining a block of data samples comprised of a plurality of samples; applying the block of data to a crest factor reduction block; and providing a processed block of data from the crest factor reduction block. The block-based crest factor reduction method can optionally be iteratively performed a plurality of times for the block of data. The block of data samples can comprise an expanded block having at least one cursor block. For example, at least two pre-cursor blocks and one post-cursor block can be employed. The peaks can be cancelled, for example, only in the block of data samples and in a first of the pre-cursor blocks.

Abstract translation: 提供了基于块的波峰因数降低（CFR）技术。 一种示例性的基于块的波峰因子降低方法包括获得由多个样本组成的数据样本块; 将数据块应用于波峰因数减少块; 并从波峰因数减小块提供经处理的数据块。 可以可选地对块数据迭代地执行基于块的波峰因数降低方法。 数据样本块可以包括具有至少一个光标块的扩展块。 例如，可以使用至少两个前置光标块和一个后置光标块。 可以例如仅在数据样本块和第一个前缀块中取消峰值。