Patent ID: 7668077

Claim:
A downlink multi-user space time block code pre-coding method, comprising: a first step of acquiring channel information for a plurality of user terminals at a base station; a second step of transforming the channel information for the plurality of user terminals into a channel matrix; a third step of obtaining a transform matrix where a result of multiplication with the channel matrix is a block diagonal orthogonal matrix, based on the channel matrix; a fourth step of obtaining standardization factors for each user terminal by obtaining a square of elements that are diagonals of the block diagonal orthogonal matrix; a fifth step of carrying out standardizing processing on symbols of each user to be transmitted using the standardization factors to obtain standardized symbols; a sixth step of multiplying the standardized symbols with a conjugate transposed matrix of the block diagonal orthogonal matrix from the left and then multiplying the multiplication result with the transform matrix from the left and obtaining processed symbols; and a seventh step of transmitting the processed symbols based on space time block coding rules.