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In this paper, the Bit Error Rate (BER), performance of conventional Discrete Fourier Transform (DFT) - OFDM system is compared with Non-conventional Discrete Cosine Transform (DCT)- OFDM system in AWGN and Rayleigh fading environment. Further DCT based technique using nonconventional mapping schemes outperforms the conventional mapping schemes for the same DCT based technique. OFDM systems are often used for digital communications due to several different reasons, including their inherent frequency diversity due to multicarrier modulation. This feature is particularly attractive for wireless communications, where multipath channels are common.
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