Abstract
This paper examines the performance of a generalized constant envelope Discrete Cosine Transform and Fast Fourier Transform based Orthogonal Frequency Division Multiplexing (CE-DCT-OFDM and CE-FFT-OFDM) system over AWGN channel. In the system, M-ary pulse amplitude modulation (M-ary PAM) mapper is considered and closed-form expressions for bit error rate of these systems are derived. The receiver structure consists of a phase demodulator followed by the standard OFDM demodulator. Both analytical and simulations results of BER performance of CE-FFT-OFDM and CE-DCT-OFDM systems are persented. It is shown that at bit error rate of 10(-4), the CE-DCT-OFDM system has 3 dB performance loss compared to CE-FFT-OFDM system.