Method and apparatus for optimizing sending terminal of MIMO SDM system based on MMSE criterion

The invention relates to a sending terminal optimization method and a device thereof of an MIMO space division multiplexing system based on MMSE criteria, and belongs to the technical field of wireless communication. The method comprises the steps of determining the structural model and the optimization design performance criteria of the MIMO space division multiplexing system; dividing the optimum structure of the transmitting terminal of the MIMO space division multiplexing system into a space division multiplexing part and a power control part; and constructing a preprocessing matrix by using the product of a multiplexing matrix and a power distribution matrix. The system designs an optimum codebook according to the above structure, and stores the codebook in the transmitting terminal and a receiving terminal; the receiving terminal selects an optimum code word in the codebook according to the channel state information as an optimum preprocessing matrix of the transmitting terminal; the receiving terminal feeds back the serial number of the optimum code word to the transmitting terminal; and the transmitting terminal selects the corresponding matrix in the codebook according the serial number of the optimum code word, to complete the optimization of the transmitting terminal. The method can distribute system resources and improve system performance more reasonably.