An Approach for increasing SNR with varying data rate in OFDM transmission system

OFDM is a multi carrier modulation technique in which the carriers are Orthogonal to each others as a result of which it provides high bandwidth efficiency and multiple carriers share the data among themselves. This paper describes an approach for reduction in BER with increment in SNR and varying the data rates of OFDM transmission system. We present a scheme of basic OFDM transceiver with 32-point QAM and 128 point FFT which reduce the BER when SNR increases in the system. The design unit consist of transmitter and receiver characteristics using 32 QAM and whole system is implemented overMATLAB 7.8.0.