Abstract: The performance of 2x2 Multiple Input multiple Output (MIMO) antenna systems is proposed to analyze by determining the transmit diversity using Alamouti Space Time Coding (STBC) techniques. For the BPSK and QPSK modulation technique transmission characteristics are determine. Adaptive White Gaussian Noise (AWGN) is proposed to presuming flat fading Rayleigh channel. On receiver side, linear equalization techniques such as Zero Forcing (ZF) and Maximum Likelihood Detector (MLD) are proposed to computing BER. The STBC codes for digital transmission shows significant improvement in BER performance with higher levels of digital modulation. MATLAB tool is used for simulation and its performance.

Keywords: Multiple Input Multiple Output (MIMO), Space Time Block Code (STBC), Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK),Zero Forcing (ZF),Maximum Likelihood Detector (MLD).