Abstract
An M-ary pulse modulation technique is widely used in communication systems. One of the popular M-ary pulse modulation schemes is M-ary Pulse Amplitude Modulation ( M-ary PAM), which plays an important role in the modern wireless communications systems .In this work the multi-level ( M-ary) PAM, modulation for M=16, 32, 64, 128 and 256 –PAM is investigated and simulated using Simulink 2017a, where the proposed system implements multi antenna diversity of 2x3, two antennas for the transmitter and three for the receiver . This investigation is done over AWGN , Rayleigh and Rician channels using Multi Input Multi Output (MIMO system in order to compare the Bit Error Rate (BER) performance for the mentioned channels. The achieved simulation results indicated that the BER increases as the level of M-PAM increases at the same Eo/No value, which is normal since this is the case with most M-ary techniques. Also the M- ary PAM over Rician channel has a better BER performances than the M-ary PAM over AWGN and Rayleigh channels at BER=10-4 .
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