The Research Of The Linear MIMO System Pre-coding

The society is an informationized society today. It’s hardly to develop wireless communication technology to a higher level. Almost it is an irreconcilable conflict between the limited frequency resources and increasing needs of the users. In the future development of wireless communication, how to improve the wireless data rate is the key issues. MIMO technology without increasing the bandwidth capacity of the whole system could take a linear growth. MIMO is the important technology in the future wireless communication. There has deficiency of the rank in MIMO channel matrix,to solve this problme people use pre-coding technology.it can send the transmission sequence into M parallel sub-sequences.then multipied with the pre-coding matrix assigned it the different trasmitting antennas.it can inhibit the deficiency of MIMO channel rank of the system.The state of the passage introduced the research of MIMO technology, especially the pro-coding technology. For the deficiency of traditional pre-coding scheme, I designed a new coding scheme, proposed a new TH pre-coding scheme based on the traditional TH pre-coding scheme. Because of the latency and interference between transmitting antenna and receiving antenna, the massage that reaches the receiving antenna will be more accurate than which feeds back to the transmitting antenna, the main idea of the design in this paper is re-optimization with the accurate channel massage which reaches the receiving antenna, the specific program is adding processing matrix D to the receiving antenna, processing matrix D is corresponding to the channel status massage H, according to the channel status massage H, we adjust it by various criterions, since the interference between users is cancelled by the joint processing of transmitting and receiving antennas, the processing vector can be obtained without iterative computation. Because of the various criterions in the design we use, the reception will be better as the receiver takes another balance without additional complexity. The proposed THP scheme can improve the BER and capacity performance of the system greatly when each receiver has two antennas.