In this paper an overview of multiple input-multiple-output (MIMO) system is presented. Multiple antenna transmission technology or MIMO system can increase the overall system performance. With increasing popularity of multimedia communications, high data rate transmission is expected to be supported by cellular communication networks. The implementation of MIMO technology in wireless communication networks plays a major role in improving the quality of signal and multiplexing opportunities and in turn increasing data throughput. Multiple antennas can be used to accomplish a multiplexing gain, array gain, diversity gain, or an antenna gain for enhancing the bit rate and the error performance of system. MIMO can be considered as one of the several forms of smart antenna technology. MIMO offers significant increases in data throughput .Future wireless applications demands for high data rates and high link quality. MIMO systems can be treated as an emerging technology in the next generations of cellular communication networks and wireless local area networks.
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