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In this paper, the authors describe the analysis of Multiple Input Multiple Output (MIMO) beamforming with adaptive modulation using spectral efficiency as a figure of merit in multipath fading environment. Multipath fading environment causes the transmitted signals to be unreliable due to effects of tall buildings, trees, mountains, moving objects and so on. As a result of increase in demand for information communication technology which is an aspect of wireless communication, this motivated this research work. The system model for MIMO beamforming mode is developed for a 2x2, 3x3 and 4x4 antenna systems configuration in the presence of frequency selective Rayleigh fading channel. A closed-form expression for spectral efficiency is also developed.
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