The concept of MIMO used in communication system was put forward as early as 1970s, but the foundational work that greatly promoted the practical application of MIMO technology in wireless communication system was completed by scholars in at & T Bell laboratory in 1990s. In 1995, teladar gave the capacity of MIMO system in the case of fading; in 1996, foshinia gave a multiple in and multiple out processing algorithm - d-blast (diagonal blast, Diagonal blast) algorithm; in 1998, Tarokh et al. Discussed the space-time code for multiple in and multiple out; in 1998, woliansky et al. Established a MIMO experimental system by using V-BLAST algorithm, and achieved the frequency spectrum utilization rate of more than 20 bit / S / Hz in the indoor test, which is very difficult to achieve in the ordinary system. These works have been paid great attention by scholars all over the world, and have made the research work of "more in, more out" develop rapidly.<br>
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