BER comparison of DCT and FFT based OFDM systems in AWGN and RAYLEIGH fading channels with different modulation schemes

摘要

In this paper, we consider DCT based OFDM system and FFT based OFDM system for calculating BER in AWGN and Rayleigh fading channels using BPSK and QPSK as modulating schemes. In addition to this, the BER performance over AWGN and Rayleigh fading channel are compared to estimate their performance. The results indicate that DCT based OFDM system performs better than FFT based OFDM system using BPSK as modulation scheme over AWGN channel. DCT based OFDM system surpass FFT based OFDM system.