Patent ID: 8891604

Claim:
In a multiple-input multiple-output (MIMO) wireless system supporting Coordinated Multi-Point (COMP) transmission and having a first base station, a second base station, and a user equipment, a communications method implemented in the first base station, the communications method comprising: exchanging, with the second base station through local information exchange, first information about a first channel between the first base station and the user equipment and second information about a second channel between the second base station and the user equipment; and computing at least one of a precoding matrix, a receiver filter, and a projection matrix U and V and user k, streams of data d, potential interference P, link i and neighboring link j, and + is a complex conjugate operator, comprising determining: U [ i ] = arg ⁢ ⁢ min U [ k ] ⁢ I [ t ] = Tr ⁡ [ ( U [ k ] ) † ⁢ Q [ i ] ⁢ U [ k ] ] where ⁢ Q [ i ] = ∑ j ∈ R ⁡ ( i ) ⁢ ⁢ P d ⁢ H [ ij ] ⁢ V [ j ] ⁡ ( V [ j ] ) † ⁢ ( H [ ij ] ) † , and wherein the method further comprises the steps of estimating, by the user equipment, the first information and the second information, and sharing the first information and the second information with the first base station.