DocumentCode :
582503
Title :
An adaptive pre-distortion method based on orthogonal polynomials
Author :
Huaming, He ; Liang, Tang ; Chunsheng, Zhang ; Bin, Ye ; Kai, Yu ; Zhiyong, Bu
Author_Institution :
Shanghai Inst. of Microsyst. & Inf. Technol., Shanghai, China
fYear :
2012
fDate :
25-27 July 2012
Firstpage :
5573
Lastpage :
5576
Abstract :
Wideband signals without pre-distortion are distorted by memory and nonlinear effect of high power amplifier. To compensate these distortions, we propose an adaptive pre-distorter based on orthogonal polynomials. Based on orthogonal criterion, we derive a series of orthogonal polynomials under circular symmetric complex Gaussian distribution. Indirect learning architecture is used for pre-distorter identification and recursive least square algorithm is introduced for parameters estimation. At last using two power amplifier models, we simulate the performance of the proposed pre-distorter in an OFDM system. Simulation results show that the proposed pre-distorter can effectively compensate the distortions produced by high power amplifier.
Keywords :
Gaussian distribution; least squares approximations; parameter estimation; polynomials; power amplifiers; OFDM system; adaptive predistorter; adaptive predistortion method; circular symmetric complex Gaussian distribution; high power amplifier; indirect learning architecture; nonlinear effect; orthogonal polynomials; parameters estimation; predistorter identification; recursive least square algorithm; wideband signals; Gaussian distribution; Mathematical model; Nonlinear distortion; OFDM; Polynomials; Power amplifiers; Nonlinear Distortion; Orthogonal Polynomials; Pre-distortion; Recursive Least Square;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Control Conference (CCC), 2012 31st Chinese
Conference_Location :
Hefei
ISSN :
1934-1768
Print_ISBN :
978-1-4673-2581-3
Type :
conf
Filename :
6390914
Link To Document :
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