Adaptive predistortion linearization based on orthogonal polynomial expansion for nonlinear power amplifiers in OFDM systems

Osamu Muta, Isamu Kaneko, Yoshihiko Akaiwa, Hiroshi Furukawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

Adaptive predistorter is an effective technique to compensate for nonlinear distortion in a power amplifier. As a method to improve the parameter convergence speed in the predistorter, a series expansion technique with an orthogonal polynomials has been investigated. In this paper, we present an adaptive predistortion linearization method based on orthogonal polynomial expansion for a nonlinear power amplifier affected by memory effect in OFDM systems, where both memory and memoryless predistorter are constructed by the weighted sum of orthogonal polynomials. In addition, to achieve the parameter optimization speed improvement of the predistorter, we propose a method to determine step-size in a recursive calculation. The parameter convergence performance of the predistorter is investigated in OFDM systems with and without peak-to-average power ratio (PAPR) reduction, where the partial transmit sequence (PTS) technique is employed to reduce PAPR. Computer simulation results show that the proposed adaptive predistorter achieves faster parameter convergence time than that of non-orthogonal one in OFDM systems with nonlinear power amplifier affected by memory effect, even though PAPR of OFDM signal is reduced by using PTS. It is also confirmed that power added efficiency is further improved by combining the adaptive predistortion with PAPR reduction technique.

Original languageEnglish
Title of host publicationICCSP 2011 - 2011 International Conference on Communications and Signal Processing
Pages512-516
Number of pages5
DOIs
Publication statusPublished - Apr 22 2011
Event2011 International Conference on Communications and Signal Processing, ICCSP 2011 - Kerala, India
Duration: Feb 10 2011Feb 12 2011

Publication series

NameICCSP 2011 - 2011 International Conference on Communications and Signal Processing

Other

Other2011 International Conference on Communications and Signal Processing, ICCSP 2011
CountryIndia
CityKerala
Period2/10/112/12/11

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Signal Processing

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