MU-MIMO (multi-user multiple-input multiple-output) user pairing method

The invention provides an MU-MIMO (multi-user multiple-input multiple-output) user pairing method. The method includes: A, a transmitting end selects users feeding back largest CQI (channel quality information) from a user set, and the selected users are placed in a set of set paired users; B, the transmitting end performs singular value decomposition to channel matrix of each current user in the user set once so as to obtain a null space of each user channel matrix, and performs singular value decomposition to a channel matrix of each user in the paired user set once so as to obtain a null space of each user channel matrix; C, according to the channel matrixes and null spaces of the channel matrixes of the user in the paired user set, and according to the channel matrix and the null space of the channel matrix of each current user in the user set, the transmitting end determines the users to be placed in the paired user set and places the determined users in the paired user set; and D, whether the number of