JCS_V2_N3_RP3 Hemlata Sinha M.R. Meshram G.R. Sinha Journal on Communication Engineering and Systems 2277-5242 2 3 23 28 BER, MIMO System, Signal to Noise Ratio (SNR), STC Space-Time Coding (STC)transmits and receives information at higher data rates with more reliability by using multiple antennas at both sides. In this paper, Multiple-Input–Multiple-Output (MIMO) systems with reduced complexity and the space–time block coding, for communication over Rayleigh fading channels using multiple transmit antennas have been considered. We have tested the performance of Alamouti coding technique for the Rayleigh channel. The signals on the transmit (Tx) antennas at one end and the receive (Rx) antennas at the other end are “combined” in such a way that the quality (bit-error rate or BER) or the data rate (bits/sec) of the communication for each MIMO user are improved. The simulation results are used to analyze and compare the performance. May - July 2013 Copyright © 2013 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=2333