Abstract
Constant envelope Orthogonal Frequency Division Multiplexing (OFDM) system is considered and examined for Bit Error Rate (BER) performance over slowly varying Rayleigh and Rician fading channels. In the system, fast Fourier and discrete cosine transform techniques are used in conjunction with Continuous Phase Modulation (CPM). Analytical expressions for BER that are easy for numerical computation have been derived and illustrated as function of E b /N 0 Signal-to-Noise Ratio (SNR), h, the modulation index, M, number of amplitude levels in the data mapper, and statistical parameters of fading distributions. It is observed that OFDM system with Discrete Cosine Transform (DCT) is superior in many ways including BER performance compared to the corresponding system with Fast Fourier Transform (FFT).
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