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Multiple-input–multiple-output (MIMO) wireless systems use multiple antennas at transmitting andreceiving end to offer improved capacity and data rate over single antenna systems in multipath channels.In this paper we have investigated the Spatial Multiplexing technique of MIMO systems. Here differentfading channels like AWGN and Rician are used for analysis purpose. Moreover we analyzed the techniqueusing high level modulations (i.e. M-PSK for different values of M). Detection algorithms used are Zero-Forcing and Minimum mean square estimator. Performance is analyzed in terms of BER (bit error rate) vs.SNR (signal to noise ratio)

BER Analysis of 2x2 MIMO Spatial Multiplexing Under AWGN and Rician Channels for Different Modulations Techniques