Digital communication using MIMO has been one ofthe most promising research areas in wireless
communications nowadays as it offers a lot of promises for future wireless communications.
MIMO seems to be the only technology that is advancing the wireless industry from 30 to 4G
systems. In this work MLMO system has been studied in great detail and simulated for different
cases and we concentrated on the performance of its capacity under several environmental
conditions. MIMO system offers significant gains in performance over traditional wireless
communication systems. Spatial multiplexing increases system throughput without consuming
frequency spectrum and spatial diversity makes the link more robust. MIMO system was described
and simulation results were presented and discussed. Multiple antenna techniques are a key to
boosting the performance of modem wireless systems