Date Added: Apr 2013
This paper presents the performance of adaptive modulation with multiple input multiple output orthogonal space time block coding MIMO-OSTBC over frequency selective Rayleigh fading channel using Bit Error Rate (BER) and Spectral Efficiency (SE) as performance measures. The increase in demand for communication networks has turned the spectrum into a precious resource, which leads to channel impairment that increases the BER and reduces the SE of the M-ary Quadrature Amplitude Modulation (M-QAM) transmitted signal. The channel model for OSTBC for 2x2, 3x3 and 4x4 transmit antenna is developed. The system model is formulated using the constellation sizes of 4-QAM, 16-QAM, 32-QAM and 64-QAM at different Signal-to-Noise Ratio (SNR).