On the BER Evaluation for Wireless OFDM System over Multipath Fading Channels

An OFDM system is deliberated for various modulation schemes like BPSK, QPSK, 8PSK, 16PSK, QAM to uncover the preeminent permutation with OFDM technology. This work is carried out over the Rayleigh- and Rician-channels with additive white Gaussian noise (AWGN) for various normalized signal-to-noise ratio (SNR) values. Furthermore, number of errors measurement is also premeditated to assess the system performance along with the best combination to be used in wireless systems. The work simulated in this paper comes out with some new and brief results under different channel conditions. Our simulative results recommend BPSK+OFDM to be implemented to provide best spectral efficiency with an alternative of QPSK+OFDM under worst channel conditions for Rayleigh channels. For, Rician channels, BPSK is recommended under poor- and good- channel conditions. Under best channel conditions, BPSK and 8PSK outperforms. This work also present the impact of number of subcarriers over the BER of the system and has been revealed out that BPSK, QPSK and 8PSK offer better spectral efficiency by increasing number of subcarriers up to a certain level under best channels conditions for Rician channel.