Title :
Modeling and Nonlinearity Compensation of Power Amplifiers in OFDM Systems
Author :
Ding, Yuanming ; Sano, Akira
Author_Institution :
Dalian Univ., Dalian
fDate :
May 30 2007-June 1 2007
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;
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
DOI :
10.1109/ICCA.2007.4376451
