Method and device of space division multiple address system based on codebook of optimal quantization error

The invention relates to a method for space division multiple-access (SDMA) system basing on an optimal quantification error code book and a device thereof and is used in the technical field of wireless transmission. The method comprises the steps that first, a corresponding initial orthogonal code book set is generated according to the number of feedback bits supported by the system and the training samples of a signal channel matrix are selected randomly at the same time; second, the training samples are distributed to each code word region by adopting the principle of shortest distance; third, quantification error is minimized by adopting an optimum principle, the code book of the regions are renewed according to the samples of each region and the quantification error is recorded; fourth, orthogonal triangular decomposition is carried out to new code books in the sub-set of the same orthogonal code book and the code book is renewed to a row, from which unitary matrix is obtained bydecomposition; fifth, judgment on whether the error is reduced is carried out and the process is stopped if the error is reduced, otherwise the process is repeated from the second step. The device ofthe invention comprises a receiving end device and a matched transmission end device. The invention can reduce the quantification error and improve the throughput capacity of the system under the condition of not increasing of feedback bits, has stable and powerful performance and is easy to be achieved.