Improvement of BER Performance in OFDM under various Channels with EH Code

Abstract: Orthogonal Frequency Division Multiplexing (OFDM) is a very efficient high speed data transmission technique in wireless communication technology. In this paper, we present Bit Error Rate (BER) performance of OFDM system using BPSK and DPSK modulation schemes, operating under various channel conditions. To imitate the practical applications in the real world Rayleigh channel, Rician channels are also considered in addition to the AWGN channel. The simulation is done to investigate the performance of the coded OFDM system over the uncoded OFDM system. It is seen that coding improves BER performance of OFDM system and hence in this work, Extended Hamming Code (EH Code) is used as Single Error Correcting Code (SEC).

Keywords: OFDM, BER, EH Code, SEC, AWGN, Rayleigh and Rician channels.