公开(公告)号：US20230421110A1

公开(公告)日：2023-12-28

申请号：US18203831

申请日：2023-05-31

Applicant: Qorvo US, Inc.

Inventor： George Maxim ,  Nadim Khlat ,  Baker Scott

IPC: H03F1/32 ,  H03F1/02 ,  H03F3/21

CPC classification number: H03F1/3241 ,  H03F1/0288 ,  H03F3/211 ,  H03F2201/3224 ,  H04B2001/0425

Abstract: An analog predistortion system for power amplifiers is disclosed. In one aspect, the system may apply analog predistortion to offset memory effects that may occur as a function of frequencies that operate faster than time constants of the related circuits. In a particular aspect, the analog predistortion is applied at least to a phase of the signal to be amplified, but may also be applied to a gain of the signal to be amplified. When such memory focused analog predistortion is combined with memoryless or low depth memory digital predistortion, overall linearity and performance of the power amplifier is improved.

公开(公告)号：US11671059B2

公开(公告)日：2023-06-06

申请号：US17645076

申请日：2021-12-20

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Hongmin Choi ,  Junse Lee ,  Hyunseok Yu ,  Youngik Cho

IPC: H04K1/02 ,  H04L25/03 ,  H04L25/49 ,  H03F1/32 ,  H03F3/24 ,  H04B1/04 ,  H03F3/189

CPC classification number: H03F1/3258 ,  H03F3/189 ,  H03F3/24 ,  H04B1/0475 ,  H03F2201/3224

Abstract: A device configured to perform wireless communication includes: a pre-distortion circuit configured to generate a pre-distorted input signal by performing pre-distortion on an input signal based on a parameter set comprising a plurality of coefficients; a power amplifier configured to generate an output signal by amplifying an RF signal based on the pre-distorted input signal; and a parameter obtaining circuit configured to obtain second memory polynomial modeling information corresponding to an operating frequency band based on first memory polynomial modeling information corresponding to each of a plurality of frequency sections and obtain a parameter set according to an indirect learning structure by using the second memory polynomial modeling information.

公开(公告)号：US20180227152A1

公开(公告)日：2018-08-09

申请号：US15827794

申请日：2017-11-30

Applicant: Dali Systems Co. Ltd.

Inventor： Wan Jong Kim ,  Kyoung Joon Cho ,  Shawn Patrick Stapleton ,  Ying Xiao

IPC: H04L27/00 ,  H04L27/36 ,  H03F1/30 ,  H03F1/32 ,  H03F3/08 ,  H03F3/19 ,  H03F3/24 ,  H04W24/02 ,  H04L25/08 ,  H04L25/06

CPC classification number: H03F1/304 ,  H03F1/3241 ,  H03F1/3247 ,  H03F1/3258 ,  H03F3/087 ,  H03F3/19 ,  H03F3/24 ,  H03F2200/18 ,  H03F2200/204 ,  H03F2200/207 ,  H03F2200/447 ,  H03F2200/451 ,  H03F2201/3206 ,  H03F2201/3209 ,  H03F2201/3212 ,  H03F2201/3215 ,  H03F2201/3224 ,  H03F2201/3227 ,  H04L25/067 ,  H04L25/08 ,  H04L27/0008 ,  H04L27/368 ,  H04W24/02

Abstract: A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.

公开(公告)号：US09966906B2

公开(公告)日：2018-05-08

申请号：US15496124

申请日：2017-04-25

Applicant: FUJITSU LIMITED

Inventor： Akihiko Komatsuzaki ,  Satoshi Matsubara ,  Shinichiro Kobayashi ,  Hideharu Shako

IPC: H04L25/03 ,  H03F1/32 ,  H03F3/195 ,  H03F3/24

CPC classification number: H03F1/3247 ,  H03F3/195 ,  H03F3/245 ,  H03F2200/451 ,  H03F2201/3224 ,  H03F2201/3233

Abstract: A radio apparatus includes an amplifier that amplifies electrical power of a signal that is wirelessly transmitted, and a processor that executes a process including: performing, by using a distortion compensation coefficient that compensates distortion generated in the amplifier, distortion compensation of an input signal; reading, from a predetermined memory, a threshold that varies in accordance with the electrical power of the input signal; and comparing the read threshold with a monitoring target which includes the distortion compensation coefficient used with respect to the input signal to monitor whether an abnormality is present in the distortion compensation of the input signal.

公开(公告)号：US09948332B2

公开(公告)日：2018-04-17

申请号：US14703579

申请日：2015-05-04

Applicant: Dali Systems Co. Ltd.

Inventor： Wan-Jong Kim ,  Kyoung-Joon Cho ,  Shawn Patrick Stapleton ,  Ying Xiao

IPC: H04L25/49 ,  H04B1/04 ,  H03F1/32 ,  H03F3/24 ,  H03F3/68 ,  H04B1/00 ,  H04W24/02 ,  H04W84/04 ,  H04W88/08

CPC classification number: H04B1/0475 ,  H03F1/3247 ,  H03F3/24 ,  H03F3/68 ,  H03F2201/3224 ,  H04B1/0064 ,  H04W24/02 ,  H04W84/047 ,  H04W88/08 ,  H04W88/085 ,  Y02D70/00 ,  Y02D70/122 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/40

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. Consequentially, the remote radio head system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems.

公开(公告)号：US09913194B2

公开(公告)日：2018-03-06

申请号：US14991264

申请日：2016-01-08

Applicant: Dali Wireless, Inc.

Inventor： Wan-Jong Kim ,  Kyoung Joon Cho ,  Jong Heon Kim ,  Shawn Patrick Stapleton

IPC: H03H7/30 ,  H04W40/02 ,  H03F1/32 ,  H03F3/24 ,  H04L25/03 ,  H04L27/36 ,  H04W24/02 ,  H04B1/04 ,  H04W24/04 ,  H04W40/00 ,  H04L27/26 ,  H04W72/04 ,  H04B7/022

CPC classification number: H04W40/02 ,  H03F1/3247 ,  H03F3/24 ,  H03F2200/336 ,  H03F2200/57 ,  H03F2201/3224 ,  H03F2201/3233 ,  H04B1/0475 ,  H04B7/022 ,  H04B2001/0425 ,  H04L25/03343 ,  H04L27/2618 ,  H04L27/362 ,  H04L2025/03414 ,  H04W24/02 ,  H04W24/04 ,  H04W40/00 ,  H04W72/04 ,  H04W72/0453

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.

公开(公告)号：US09768739B2

公开(公告)日：2017-09-19

申请号：US14271881

申请日：2014-05-07

Applicant: DALI SYSTEMS CO. LTD.

Inventor： Wan Jong Kim ,  Kyoung Joon Cho ,  Shawn Patrick Stapleton ,  Jong Heon Kim ,  Dali Yang

IPC: H04B1/04 ,  H03F1/32 ,  H03F3/24 ,  H03F3/19 ,  H03F3/20

CPC classification number: H03F1/3247 ,  H03F1/3258 ,  H03F3/19 ,  H03F3/20 ,  H03F3/24 ,  H03F2200/129 ,  H03F2200/451 ,  H03F2201/3224 ,  H03F2201/3227 ,  H03F2201/3233

Abstract: A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by the narrowband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, the present invention could compensate the nonlinearities as well as memory effects of the power amplifier systems and also improve performances, 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 and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.

公开(公告)号：US09760338B2

公开(公告)日：2017-09-12

申请号：US15187651

申请日：2016-06-20

Applicant: Intel Corporation

Inventor： Kameran Azadet

IPC: G06F5/01 ,  G06F17/15 ,  H03H17/06 ,  H04B1/04 ,  H04L1/00 ,  H04L27/233 ,  H04B1/62 ,  G06F9/30 ,  H04L25/02 ,  H04L25/03 ,  H03M3/00 ,  H03F1/02 ,  H03F1/32 ,  H03F3/189 ,  H03F3/24 ,  H04L25/49 ,  H04B1/00

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: Methods and apparatus are provided for direct synthesis of RF signals using maximum likelihood sequence estimation. An RF digital RF input signal is synthesized by performing maximum likelihood sequence estimation on the digital RF input signal to produce a digital stream, such that after filtering by a prototype filter the produced digital stream produces a substantially minimum error. The substantially minimum error comprises a difference between a digital output of the prototype filter and the digital RF input signal. The digital stream is substantially equal to the input digital RF signal. The digital stream can be applied to an analog restitution filter, and the output of the analog restitution filter comprises an analog RF signal that approximates the digital RF input signal.

公开(公告)号：US20170054457A1

公开(公告)日：2017-02-23

申请号：US14829296

申请日：2015-08-18

Applicant: NOKIA SOLUTIONS AND NETWORKS OY

Inventor： Antti HEISKANEN ,  Eero KOUKKARI

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

CPC classification number: H04B1/0475 ,  H03F1/3247 ,  H03F3/19 ,  H03F3/24 ,  H03F3/245 ,  H03F2200/451 ,  H03F2201/3224 ,  H04B2001/0408

Abstract: Appropriate signal processing may be beneficial in a variety of communication systems and elements thereof For example, time domain digital pre-distortion may benefit from suitable treatment of frequency switching. A method can include determining whether an instantaneous frequency of an input signal is positive or negative. The method can also include selecting a pre-distortion model from a set of pre-distortion models based on the determination of positive or negative instantaneous frequency. The method can further include applying the selected pre-distortion model to the input signal for a time corresponding to the determination of instantaneous frequency to provide an output signal. The method can additionally include providing the output signal to a power amplifier.

Abstract translation: 适当的信号处理在各种通信系统及其元件中可能是有益的。例如，时域数字预失真可以受益于频率切换的适当处理。 方法可以包括确定输入信号的瞬时频率是正还是负。 该方法还可以包括基于正或负瞬时频率的确定从一组预失真模型中选择预失真模型。 该方法还可以包括将所选择的预失真模型应用于输入信号一段与瞬时频率的确定相对应的时间以提供输出信号。 该方法还可以包括向功率放大器提供输出信号。

公开(公告)号：US20170033969A1

公开(公告)日：2017-02-02

申请号：US15173887

申请日：2016-06-06

Applicant: Dali Systems Co. Ltd.

Inventor： Dali Yang ,  Jia Yang

IPC: H04L27/36 ,  H03F3/24 ,  H03F3/19 ,  H04L1/00 ,  H03F1/32

CPC classification number: H04L27/368 ,  H03F1/3247 ,  H03F3/189 ,  H03F3/19 ,  H03F3/195 ,  H03F3/24 ,  H03F3/245 ,  H03F2200/336 ,  H03F2200/451 ,  H03F2201/3224 ,  H03F2201/3227 ,  H03F2201/3233 ,  H04B1/0475 ,  H04L1/0043 ,  H04L1/0044 ,  H04L27/367 ,  H04W52/52

Abstract: A power amplifier system includes an input operable to receive an original value that reflects information to be communicated and an address data former operable to generate a digital lookup table key. The power amplifier system also includes a predistortion lookup table coupled to the address data former and a power amplifier having an output and coupled to the predistortion lookup table. The power amplifier system further includes a feedback loop providing a signal associated with the output of the power amplifier to the predistortion lookup table and a switch disposed in the feedback loop and operable to disconnect the predistortion lookup table from the output of the power amplifier.

Abstract translation: 功率放大器系统包括可操作以接收反映要传送的信息的原始值的输入和可操作以产生数字查找表密钥的地址数据表。 功率放大器系统还包括耦合到地址数据形成器的预失真查找表和具有输出并耦合到预失真查找表的功率放大器。 功率放大器系统还包括反馈回路，其将与功率放大器的输出相关联的信号提供给预失真查找表，以及设置在反馈回路中的开关，用于将预失真查找表与功率放大器的输出断开。