Patent ID: 8660225

Claim:
A method for acquiring a precoding matrix, the method comprising: for each receiving end in a Multi-In Multi-Output (MIMO) system, selecting interference vectors as interference space basis vectors from whole interference vectors, and representing remaining interference vectors as a linear combination of the interference space basis vectors, wherein the remaining interference vectors are the interference vectors in the whole interference vectors of the receiving end except the interference vectors which act as the interference space basis vectors; and determining a currently used precoding matrix according to the linear combination of the interference space basis vectors represented by the remaining interference vectors of each receiving end and a current channel condition, wherein the interference vectors are represented as a product of a channel vector and a precoding vector; wherein, for each receiving end, selecting the interference vectors as the interference space basis vectors from the whole interference vectors comprises: for the kth receiving end, determining that the number of the interference space basis vectors is N−L K ; and selecting N−L K interference vectors as the interference space basis vectors from L−L K interference vectors; wherein, N is the number of receiving antennas of the kth receiving end, L K is the number of signal flows of the kth receiving end, and L is the total number of signal flows of a plurality of receiving ends, and wherein N, L K , and L are integers.