On preprocessing technology for downlink MIMO system

In order to improve the efficiency on the multi-user wireless spectrum and achieve the communication at the same base station, a novel preprocessing technology is proposed for the downlink MIMO system in this paper. Firstly, based on the theory of the equivalent channel energy, by calculating Frobenius norm on the channel energy from all the users, the receiving antennas with the maximum energy are perfectly selected, which can effectively reduce the computational complexity. After they are confirmed, using dual QR decompositions achieve the precoding matrix, which can eliminate the common channel interference largely. Afterwards, the system simulation and the results analysis demonstrate the efficiency and the reliability of this preprocessing technology that can improve the overall performance of MIMO system.