An Adaptive Predistorter Scheme in Wireless OFDM Transmitter

Adaptive predistortion technique in digital wireless OFDM modulation scheme is investigated. To combat the large peak-to-average power ratio of OFDM signals and the nonlinear distortion introduced by high power amplifier (HPA), a novel predistorter based on the look-up-table suitable for the OFDM transmitte is proposed. The adaptive algorithm and the modification method of look-up-table are also presented. Through computer simulation, the performance of the predistorter proposed for OFDM system is analyzed. Simulation results prove the validity and efficient performance of proposed scheme.