Performance comparison of STBC-FT based OFDM wireless communication system using M-QAM and M-PSK modulation techniques

This article investigates the comparative between the Bit Error Rate (BER) performance of Phase Shift Keying (PSK) and quadrature amplitude modulation (QAM) based on Space Time Block Coded Orthogonal Frequency-Division Multiplexing based on Discrete Framelet transform (STBC-FT-OFDM) system. This comparison is accomplished through simulation programs for different constellation points numbers for M-PSK and M-QAM (M = 4, 16, and 64) over an Additive White Gaussian Noise (AWGN), and Rayleigh multipath fading channels. The simulation results showed that the M-QAM modulation technique gave preferable BER performance compared with M-PSK modulation technique at all cases of constellation points and channels.