Patent ID: 7403748
Filing Date: 2008-07-22
Classification: H04B,H04L

Abstract:
1. A method for transmitting a transmission signal from an antenna array to a receiving means of a wireless communication system, said method comprising the steps of: a) performing a signal quality measurement at said receiving means for predetermined antennas or beams of said antenna array; b) selecting at least two of said predetermined antennas or beams of said antenna array based on feedback information derived from said signal quality measurement; and c) using said at least two selected antennas or beams for transmitting said transmission signal according to a transmit diversity or beamforming scheme; wherein said selection comprises a pre-selection performed at said receiving means and a subsequent final selection at a transmitting end; wherein said final selection is based on a scoring system which takes into account said feedback information, an amplifier load condition of channels associated with said at least two selected antennas, and a degree of interference to co-channel users of said associated channels; wherein the scoring system is implemented by defining final scores of said at least two selected antennas, the final scores being defined by scores for respective antennas of said at least two selected antennas, the scores for the respective antennas including a score of a respective antenna due to a selection by the receiving means, the score of a power loading of a power amplifier of the respective antenna, the score of interference produced by the respective antenna and the score of a selection of the respective antenna in former transmission bursts; and weighting the scores and summing up the weighted scores so as to form a final score for the respective antenna.