MIMO (Multiple-Input Multiple-Output) uses multiple antennas to suppress channel fading. MIMO technology refers to installing multiple transfer antennas and receiving end-to-end antennas and receiving end-of-each. The starting point is combining multiple transmission antennas and multiple receiving antennas to improve each user's communication quality (such as error rate) or improve communication efficiency. (Eg data rate). Multiple input multiple output (MIMO) system is developed based on wireless communication smart antenna technology. Its main feature is the use of multiple antenna configurations on both ends of the communication system to solve the large capacity and fast delivery of future mobile communication systems. Increasing tensions between spectrum sources. MIMO is a major breakthrough in smart antennas in the field of wireless communications. It uses multiple antennas (or antennas) at the end of sending and receiving end to simultaneously send and receive signals.