Title :
Adaptive Linearization for Power Amplifier in OFDM Systems
Author :
Ding, Yuanming ; Liu, Yan ; Nilkhamhang, Itthisek ; Sano, Akira
Author_Institution :
Univ. Key Lab of Inf. Sci. & Eng., Dalian Univ.
Abstract :
An adaptive predistortion linearization is proposed to compensate for the nonlinearity and memory effects of power amplifiers (PAs) in orthogonal frequency division multiplexing (OFDM) communication systems. By using a simplified Volterra series model (VSM) to express the uncertain nonlinear input-output dynamics of PA with a Wiener-Hammerstein structure, an adaptive predistorter is generated directly without identification of inverse model of the PA. When OFDM signals pass through the cascade system of the predistorter and the PA, overall linearization from predistorter input to PA output can be achieved. The effectiveness of the proposed predistortion method is validated by numerical simulation for 64-ary quadrature amplitude modulation OFDM (64QAM-OFDM) transmission systems
Keywords :
OFDM modulation; Volterra series; adaptive systems; nonlinear distortion; power amplifiers; 64-ary quadrature amplitude modulation; OFDM systems; Volterra series model; Wiener-Hammerstein structure; adaptive predistortion linearization; orthogonal frequency division multiplexing communication; power amplifier; Adaptive systems; Inverse problems; Nonlinear dynamical systems; Numerical simulation; OFDM; Power amplifiers; Power system modeling; Predistortion; Signal generators; Signal processing; Adaptive control; OFDM; linearization; power amplifier (PA);
Conference_Titel :
SICE-ICASE, 2006. International Joint Conference
Conference_Location :
Busan
Print_ISBN :
89-950038-4-7
Electronic_ISBN :
89-950038-5-5
DOI :
10.1109/SICE.2006.315267
