Patent ID: 8472409

Claim:
A data transmission method for a distributed antenna system comprising a central controller and a plurality of radio transceiver units, wherein, the method comprises: selecting, by the central controller, a set of radio transceiver units for transmission of data to a user equipment according to power information of a user equipment pilot reference signal transmitted by the radio transceiver units; processing, by the central controller, the data according to the set of radio transceiver units; and distributing, by the central controller, the processed data to the radio transceiver units in the set of radio transceiver units; wherein, the processed data is downlink transmitted by the radio transceiver units in the set of radio transceiver units respectively; wherein, processing by the central controller the data according to the set of radio transceiver units comprises: determining, by the central controller, from the power information of the user equipment pilot reference signal transmitted from the radio transceiver units, channel status information in downlink transmission of the data from the radio transceiver units in the set of radio transceiver units; and processing, the central controller the data according to the channel status information; wherein, the channel status information comprises a matrix of channel impulse responses; and wherein processing, by the central controller, the data according to the channel status information comprises: decomposing, by the central controller, the matrix of channel impulse responses to derive vectors of beam weighting for each of the radio transceiver units in the set of radio transceiver units; and performing, by the central controller, a beam weighting process on the data for transmission from each of the radio transceiver units in the set of radio transceiver units according to the derived vectors of beam weighting for the radio transceiver unit.