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    Low-power approximate DPD actuator for 5G-new radio
    2.
    发明授权
    Low-power approximate DPD actuator for 5G-new radio 有权

    公开(公告)号：US11736068B2

    公开(公告)日：2023-08-22

    申请号：US17867412

    申请日：2022-07-18

    Applicant: Telefonaktiebolaget LM Ericsson (publ)

    Inventor： Asad Jafri ,  Jessica Chani ,  Kristian Eklund

    IPC: H04B1/04 ,  H03F1/32 ,  H04L27/36

    CPC classification number: H03F1/3247 ,  H03F1/3252 ,  H03F1/3258 ,  H04B1/04 ,  H04B1/0475 ,  H04L27/368 ,  H03F2201/3209 ,  H03F2201/3212 ,  H03F2201/3224 ,  H03F2201/3233 ,  H04B2001/0425

    Abstract: Systems and methods are disclosed herein for providing efficient Digital Predistortion (DPD). In some embodiments, a system comprises a DPD system comprising a DPD actuator. The DPD actuator comprises a Look-Up Table (LUT), selection circuitry, and an approximate multiplication function. Each LUT entry comprises information that represents a first set of values {p1, p2, . . . , pk} and a second set of values {s1, s2, . . . , sk} that represent a LUT value of s1·2p1+s2·2p2+ . . . +sk·2pk where each value si ∈{+1 , −1} where k≥2. The selection circuitry is operable to, for each input sample of an input signal, select a LUT entry based on a value derived from the input sample that is indicative of a power of the input signal. The approximate multiplication function comprises shifting and combining circuitry that operates to, for each input sample, shift and combine bits that form a binary representation of the input sample in accordance with {p1, p2, . . . , pk} and {s1, s2, . . . , sk} to provide an output sample.

    DISTORTION COMPENSATION APPARATUS AND WIRELESS COMMUNICATION APPARATUS
    5.
    发明申请
    DISTORTION COMPENSATION APPARATUS AND WIRELESS COMMUNICATION APPARATUS 有权
    失真补偿装置和无线通信装置

    公开(公告)号：US20160134248A1

    公开(公告)日：2016-05-12

    申请号：US14890940

    申请日：2014-06-02

    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

    Inventor： Masahiko ONISHI

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

    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。

    DIRECT DIGITAL SYNTHESIS OF SIGNALS USING MAXIMUM LIKELIHOOD BIT-STREAM ENCODING
    6.
    发明申请
    DIRECT DIGITAL SYNTHESIS OF SIGNALS USING MAXIMUM LIKELIHOOD BIT-STREAM ENCODING 审中-公开
    使用最大似然比特流编码的信号的直接数字合成

    公开(公告)号：US20160072647A1

    公开(公告)日：2016-03-10

    申请号：US14944184

    申请日：2015-11-17

    Applicant: Intel Corporation

    Inventor： Kameran Azadet ,  Steven C. Pinault

    IPC: H04L25/03

    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: Maximum likelihood bit-stream generation and detection techniques are provided using the M-algorithm and Infinite Impulse Response (IIR) filtering. The M-Algorithm is applied to a target input signal X to perform Maximum Likelihood Sequence Estimation on the target input signal X to produce a digital bit stream B, such that after filtering by an IIR filter, the produced digital stream Y produces an error signal satisfying one or more predefined requirements. The predefined requirements comprise, for example, a substantially minimum error. In an exemplary bit detection implementation, the target input signal X comprises an observed analog signal and the produced digital stream Y comprises a digitized output of a receive channel corresponding to a transmitted bit stream. In an exemplary bit stream generation implementation, the target input signal X comprises a desired transmit signal and the produced digital stream Y comprises an estimate of the desired transmit signal.

    Abstract translation: 使用M算法和无限脉冲响应（IIR）滤波提供最大似然比特流生成和检测技术。 将M算法应用于目标输入信号X以对目标输入信号X执行最大似然序列估计，以产生数字比特流B，使得在由IIR滤波器滤波之后，产生的数字流Y产生误差信号 满足一个或多个预定义的要求。 预定义的要求包括例如基本上最小的误差。 在示例性比特检测实现中，目标输入信号X包括观察到的模拟信号，并且所产生的数字流Y包括与发送的比特流相对应的接收信道的数字化输出。 在示例性比特流生成实现中，目标输入信号X包括期望的发射信号，并且所产生的数字流Y包括所需发射信号的估计。

    QUANTITATIVE CHARACTERIZATION OF NONLINEARITY AND MEMORY EFFECT IN NONLINEAR CIRCUITS
    7.
    发明申请
    QUANTITATIVE CHARACTERIZATION OF NONLINEARITY AND MEMORY EFFECT IN NONLINEAR CIRCUITS 审中-公开
    非线性电路中非线性和记忆效应的量化特征

    公开(公告)号：US20150160279A1

    公开(公告)日：2015-06-11

    申请号：US14564071

    申请日：2014-12-08

    Applicant: QUALCOMM Incorporated

    Inventor： Hao Zhou ,  Feipeng Wang ,  Haojen Cheng ,  Volodymyr Rakytyanskyy

    IPC: G01R29/26 ,  H03F1/32

    CPC classification number: G01R29/26 ,  H03F1/3247 ,  H03F3/189 ,  H03F3/245 ,  H03F2201/3209 ,  H03F2201/3224 ,  H03F2201/3233

    Abstract: An input signal is transmitted to a component. A distortion associated with the component is determined based, at least in part, on an output signal generated by the component in response to the input signal. A distortion error measurement associated with the component is determined based, at least in part, on the distortion and the output signal generated by the component. A memory effect and the associated nonlinearity within the component are quantified based, at least in part, on the distortion error measurement.

    Abstract translation: 输入信号被发送到组件。 至少部分地基于由该组件响应输入信号产生的输出信号来确定与该组件相关联的失真。 至少部分地基于由该部件产生的失真和输出信号确定与该部件相关联的失真误差测量。 至少部分地基于失真误差测量量化部件内的记忆效应和相关联的非线性。

    Predistortion Correction Method, Predistortion Correction Apparatus, Transmitter, and Base Station
    8.
    发明申请
    Predistortion Correction Method, Predistortion Correction Apparatus, Transmitter, and Base Station 有权
    预失真校正方法，预失真校正装置，变送器和基站

    公开(公告)号：US20150078484A1

    公开(公告)日：2015-03-19

    申请号：US14552056

    申请日：2014-11-24

    Applicant: Huawei Technologies Co., Ltd.

    Inventor： Yuxiang Xiao ,  Erni Zhu ,  Anding Zhu

    IPC: H03F1/32 ,  H03F3/19 ,  H04B1/04 ,  H03F3/24

    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。

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