Time-domain adaptive predistortion for nonlinear amplifiers

• Published in: 2004 IEEE International Conference on Acoustics, Speech and Signal Processing Vol. 2; pp. ii - 865
• Main Authors: Yuanming Ding, Sano, A.
• Format: Conference Proceeding
• Language: English; Japanese
• Published: Piscataway, N.J IEEE 28.09.2004
• Subjects: Applied sciences; Exact sciences and technology; High power amplifiers; Information, signal and communications theory; Multiplexing; Nonlinear distortion; Numerical simulation; OFDM; Phase distortion; Power system modeling; Predistortion; Signal and communications theory; Table lookup; Telecommunications and information theory; Time domain analysis; Transmitters; Performance evaluation; Adaptive method; Non linear phenomenon; Power series; High power; Time domain method; Series expansion; Hammerstein equation; Orthogonal frequency division multiplexing; Numerical simulation; Power amplifier; Non linear effect; Signal distortion; Linearization
• ISBN: 9780780384842; 0780384849
• ISSN: 1520-6149
• DOI: 10.1109/ICASSP.2004.1326395

This paper is concerned with a new time-domain adaptive predistortion scheme for compensating nonlinearity of high power amplifiers (HPA) in OFDM systems. A complex Wiener-Hammerstein model (WHM) is adopted to describe the input-output relationship of an unknown HPA with linear dynamics, and a power series model with memory (PSMWM) is proposed to approximate the HPA expressed by the WHM. By using the PSMWM, the compensation input to the HPA is calculated in a real-time manner so that the linearization from the predistorter input to the HPA output can be attained even if the nonlinear input-output relation of the HPA is uncertain and changeable. The effectiveness of the proposed predistortion method is validated by numerical simulation for 64QAM-OFDM systems.