A Compensation Method for Nonlinear Distortion in OFDM System

Orthogonal frequency division multiplexing (OFDM) is a multi-carrier digital modulation technique that has been under extensive study and research in recent years, in terms of considering its various advantages in combating the severe effects of the frequency selective fading. However, the OFDM system suffers from the strong sensitivity to the nonlinear distortion, introduced by the transmitting high power amplifier (HPA), since the OFDM system has the high peak-to-average power ratio (PAPR). Based on the analyses of some classic nonlinear compensation methods, we propose a new approach to compensate the nonlinearity in this paper. Its performance is verified through computer simulations. Specifically, the enhanced performance in terms of the bit error rate (BER) is documented for both the traveling wave tube amplifier (TWTA) and the solid state power amplifier (SSPA).