Modeling and Nonlinearity Compensation of Power Amplifiers in OFDM Systems

Author

Ding, Yuanming ; Sano, Akira

Author_Institution

Dalian Univ., Dalian

fYear

2007

fDate

May 30 2007-June 1 2007

Firstpage

728

Lastpage

732

Abstract

A query-based local inverse modeling approach is proposed to compensate nonlinear power amplifiers (PAs) in orthogonal frequency division multiplexing (OFDM) systems. The PA is represented by the three-box model with a Wiener-Hammerstein structure. The inverse model of the PA is constructed based on the local modeling techniques, which can work as a predistorter (compensator) of nonlinear PA. Furthermore, a new look-up table (LUT) for constructing a predistorter of PA is also given to simplify the query-based nonlinearity compensation scheme (predistortion scheme). The effectiveness of the proposed scheme is validated by numerical simulation for a 64-ary quadrature amplitude modulation OFDM (64QAM-OFDM) transmission systems.

Keywords

OFDM modulation; compensation; power amplifiers; quadrature amplitude modulation; 64-ary quadrature amplitude modulation; OFDM system; Wiener-Hammerstein structure; look-up table; nonlinearity compensation; orthogonal frequency division multiplexing system; power amplifier; query-based local inverse modeling approach; Computational complexity; High power amplifiers; Inverse problems; Nonlinear control systems; Nonlinear distortion; OFDM; Power amplifiers; Power system modeling; Predistortion; Table lookup;

fLanguage

English

Publisher

ieee

Conference_Titel

Control and Automation, 2007. ICCA 2007. IEEE International Conference on

Conference_Location

Guangzhou

Print_ISBN

978-1-4244-0818-4

Electronic_ISBN

978-1-4244-0818-4

Type

conf

DOI

10.1109/ICCA.2007.4376451

Filename

4376451