Patent ID: 7526036

Claim:
A method for transmitting and receiving signals in a cooperative, multi-user, multi-input, multi-output network, the network including a plurality of base stations and a plurality of mobile stations, and in which each base station has at least two antennas and each mobile station has at least one antenna, comprising: pre-coding jointly, at a first base station and a second base station, using linear pre-coding matrices {T k } k=1 . . . K , a plurality of data streams to produce first signals and second signals; optimizing the pre-coding matrices using numerical optimization techniques, in which the optimizing is subject to a predetermined per mobile station power constraint P T according Trace(T H k T k )≦P T , for k=1, . . . ,K, where H is a channel state, and in which K is a number of the mobile stations: transmitting synchronously the first signals from the first base station and the second base station to a first mobile station; and transmitting synchronously the second signals from the first base station and the second base station to a second mobile station, in which the first signal and the second signal are asynchronous with respect each other.