Abstract: “This paper presents performance comparison of various modulation techniques in almouti scheme with Rayleigh fading channel. In the comparison, the space time coding has been used. The performance comparison are made on the basis of symbol error rate(SER) performance matrices over Rayleigh fading channel with 16-PSK,QPSK,PAM,16-QAM,64-QAM modulation technique. The comparison results show that in Rayleigh fading the symbol error rate is least for QPSK modulation technique as compared to other three modulation techniques i.e. M- QAM ,PAM and 16-PSK.”

Keywords: MIMO, Modulation Techniques, SER,MQAM,PAM,16-PSK,QPSK,64-QPSK