Transmission end optimizing method and apparatus based on capacity under QoS limitation condition

The invention discloses a capacity-based transmitting terminal optimization method and a device under restricted quality-of-service conditions in the wireless communication technical field; the steps include: firstly, the structural model of a system and the performance measuring criteria of the system are determined, i.e., Space Division Multiplexing MIMO (multi-input multi-output) system, to maximize the capacity of the system and satisfy the QoS (quality-of-service) demand of the system; and then an optimal codebook is off-line designed according to the optimum pretreated matrix structure of a transmitting terminal, and the codebook is stored in the transmitting terminal and a receiving terminal; following that, the receiving terminal, according to channel state information (CSI), selects the optimum code word from the codebook as the optimum pretreated matrix of the transmitting terminal, and records the serial number of the code work in the codebook; finally, the receiving terminal feedbacks the serial number of the optimum code word to the transmitting terminal, and the transmitting terminal reads the corresponding matrix from the codebook according to the serial number of the optimum code word to complete the optimization of the transmitting terminal. The invention can more reasonably allocate system resources and improve the system performance.