ABSTRACT
This paper presents you the basic priciple of OFDM(Orthogonal Frequency Division Multiplexing) and where it excels based on OFDM system , following with the prospective of wireless mobile communication. After a brief introduction to OFDM principle , it mainly focuses on the effect of OFDM system under different channels and with different system realizations on the Binary Error Rate (BER). It mainly includes two kinds of channels: the AWGN channel and the AWGN channel with Rayleigh fading. In the latter, we compare the BER with two different system realizations: one with Guarded Intervals(GI), and the other without (GI).
Key Words : OFDM, DFT, AWGN, Rayleigh fading ,GI