In MIMO spatial multiplexing system, channel state information(CSI) is very useful for adaptive selection of the optimal precoding schemes which can enhance system performance effectively.

On the subject of optimal regulator for a generalized system, if the state trajectories of the system contain some impulses, the corresponding linear-quadratic performance index will become infinite.

The optimal stage of performance stage : to enhance the position capacity spaces the comprehensively and achieve the best state, realize the athletic value of themselves, and create good results;