A fast digital predistortion algorithm for radio-frequency power amplifier linearization with loop delay compensation

Hao Li; Dae Hyun Kwon; Deming Chen; Yun Chiu

doi:10.1109/JSTSP.2009.2020562

A fast digital predistortion algorithm for radio-frequency power amplifier linearization with loop delay compensation

Hao Li, Dae Hyun Kwon, Deming Chen, Yun Chiu

Research output: Contribution to journal › Article › peer-review

Abstract

An adaptive, digital, baseband predistortion (PD) algorithm that compensates for the memoryless nonlinearities of radio-frequency (RF) power amplifiers (PAs) for wireless systems using non-constant-envelop modulation schemes is presented. Compared with the conventional, complex-gain predistorters based on lookup tables (LUTs), the proposed direct-learning, multilevel lookup table (ML-LUT) approach assisted by a hardware-efficient loop delay compensation scheme achieves a significant reduction in convergence time and an improvement in linearization accuracy in the presence of an unknown loopback delay. The experimental results in an FPGA prototyping platform show that the fast adaptation speed enables the predistorter to track time-varying PA nonlinearities as fast as in the tens of kilohertz range, constituting a potential solution for highly efficient PAs in mobile handsets.

Original language	English (US)
Pages (from-to)	374-383
Number of pages	10
Journal	IEEE Journal on Selected Topics in Signal Processing
Volume	3
Issue number	3
DOIs	https://doi.org/10.1109/JSTSP.2009.2020562
State	Published - 2009

Keywords

Baseband
Digital predistortion
Lookup table
Loop delay compensation

ASJC Scopus subject areas

Signal Processing
Electrical and Electronic Engineering

Online availability

10.1109/JSTSP.2009.2020562

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title = "A fast digital predistortion algorithm for radio-frequency power amplifier linearization with loop delay compensation",

abstract = "An adaptive, digital, baseband predistortion (PD) algorithm that compensates for the memoryless nonlinearities of radio-frequency (RF) power amplifiers (PAs) for wireless systems using non-constant-envelop modulation schemes is presented. Compared with the conventional, complex-gain predistorters based on lookup tables (LUTs), the proposed direct-learning, multilevel lookup table (ML-LUT) approach assisted by a hardware-efficient loop delay compensation scheme achieves a significant reduction in convergence time and an improvement in linearization accuracy in the presence of an unknown loopback delay. The experimental results in an FPGA prototyping platform show that the fast adaptation speed enables the predistorter to track time-varying PA nonlinearities as fast as in the tens of kilohertz range, constituting a potential solution for highly efficient PAs in mobile handsets.",

keywords = "Baseband, Digital predistortion, Lookup table, Loop delay compensation",

author = "Hao Li and Kwon, {Dae Hyun} and Deming Chen and Yun Chiu",

note = "Funding Information: Manuscript received June 13, 2008; revised March 05, 2009. Current version published May 15, 2009. This work was supported in party by the China Scholarship Council. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Naofal Al-Dhahir.",

year = "2009",

doi = "10.1109/JSTSP.2009.2020562",

language = "English (US)",

volume = "3",

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AU - Li, Hao

AU - Kwon, Dae Hyun

AU - Chen, Deming

AU - Chiu, Yun

N1 - Funding Information: Manuscript received June 13, 2008; revised March 05, 2009. Current version published May 15, 2009. This work was supported in party by the China Scholarship Council. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Naofal Al-Dhahir.

PY - 2009

Y1 - 2009

N2 - An adaptive, digital, baseband predistortion (PD) algorithm that compensates for the memoryless nonlinearities of radio-frequency (RF) power amplifiers (PAs) for wireless systems using non-constant-envelop modulation schemes is presented. Compared with the conventional, complex-gain predistorters based on lookup tables (LUTs), the proposed direct-learning, multilevel lookup table (ML-LUT) approach assisted by a hardware-efficient loop delay compensation scheme achieves a significant reduction in convergence time and an improvement in linearization accuracy in the presence of an unknown loopback delay. The experimental results in an FPGA prototyping platform show that the fast adaptation speed enables the predistorter to track time-varying PA nonlinearities as fast as in the tens of kilohertz range, constituting a potential solution for highly efficient PAs in mobile handsets.

AB - An adaptive, digital, baseband predistortion (PD) algorithm that compensates for the memoryless nonlinearities of radio-frequency (RF) power amplifiers (PAs) for wireless systems using non-constant-envelop modulation schemes is presented. Compared with the conventional, complex-gain predistorters based on lookup tables (LUTs), the proposed direct-learning, multilevel lookup table (ML-LUT) approach assisted by a hardware-efficient loop delay compensation scheme achieves a significant reduction in convergence time and an improvement in linearization accuracy in the presence of an unknown loopback delay. The experimental results in an FPGA prototyping platform show that the fast adaptation speed enables the predistorter to track time-varying PA nonlinearities as fast as in the tens of kilohertz range, constituting a potential solution for highly efficient PAs in mobile handsets.

KW - Baseband

KW - Digital predistortion

KW - Lookup table

KW - Loop delay compensation

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A fast digital predistortion algorithm for radio-frequency power amplifier linearization with loop delay compensation

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Keywords

ASJC Scopus subject areas

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