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