FDD forward link beamforming method for a FDD communications system

摘要: A highly bandwidth-efficient communications method is disclosed, to maximize the signal-to-interference-noise ratio (SINR) of transmissions from a base station a remote in wireless system. The used for stations that have plurality antenna elements that are capable spatial beam steering by altering the relative phase transmission signals respective elements. The method invention based on providing calibration frames sequentially transmit bursts particular destination remote station. include tone frequencies arranged distinctive orthogonal frequency division multiplexed pattern unique the base enables distinguish station's bursts other present crowded area. frequency division can be Hadamard code pattern, example. plurality of part frame having reference phase. The remote receives and measures values related relative phase difference between remote station also SINR received bursts. measured then prepared as sampling data message transmitted by back then calculates therefrom correction to modify difference. This applied to traffic respectively at the station, steer traffic toward The beam steers maximize signal-to-interference-noise ratio at