THE BER PERFORMANCE OF OFDM SIGNAL THROUGH MULTIPATH CHANNELS (AWGN, RAYLEIGH & RICIAN) BY USING CLIPPING

To transmit vast digital data over radio waves OFDM is the best digital modulation method. The time domain OFDM signal, that is, addition of different orthogonal sinusoids, tends to high peak to average power ratio (PAPR) which is critical to OFDM system. Clipping is the method to limit the PAPR of an OFDM signal before amplification, but in which hoist the enormous bit error rate of the received OFDM signal. The continuous function of OFDM transmission is measured by enumerating the probability of bit error rate versus signal noise ratio (SNR) beneath multipath channel models (Rician, Rayleigh and AWGN). The simulation result has demonstrated the performance of OFDM signal, underneath various channel models. We can conclude that AWGN channel is the best model when compared to Rayleigh and Rician channels.