Performance Evaluations Study of OFDM Under AWGN and Rayleigh Channels

Orthogonal Frequency Division Multiplexing (OFDM) present a new opportunity solution for telecommunications. The advantage of OFDM is simple to implement, more resistant to frequency selective fading; the disadvantage, on the other hand, is that the noise is more sensitive to the carrier frequency offset. In this article, a simulation based study of OFDM system under different channel conditions and modulations schemes. The system is evaluated under effects of Rayleigh fading channel and Gaussian noise. Our experimental findings indicate that the obvious effect of Rayleigh channel with additive Gaussian noise. Furthermore, the results show a slight BER increment when using QPSK when compared with BPSK. As well as, while signal energy incrementing the BER will be reduced.