Patent ID: 8442145

Claim:
A transmitting terminal, comprising: a signal processing unit, having K precoders, for precoding K data streams corresponding to K receiving terminals; M S radio frequency (RF) circuits for outputting M S up-converted transmit signals based on the precoded K data streams; M T transmit antennas; and a switch unit, coupled between the RF units and the transmit antennas, controlled by the signal processing unit for selection of the transmit antennas; wherein the signal processing unit sets the M T transmit antennas as a universal set, calculates a plurality of sum rates corresponding to a plurality of subsets, each subset excluding an i th transmit antenna, according to channel state information, selects the subset with a maximum sum rate as the universal set of a next iteration, and then repeats the calculating and selecting steps until the subset with the maximum sum rate remaining M S transmit antennas; wherein K, M S , M T and i are integers, M T is larger than M S , M S is larger than or equal to K, and i is equal to 1 to the number of the transmit antennas in the universal set; the signal processing unit regards the transmit antennas in the universal set as being equal power allocated, calculates a plurality of capacity losses corresponding to the subsets to replace the calculation of the sum rates, selects the subset with a minimum capacity loss as the universal set of the next iteration, and then repeats the calculating and selecting steps until the subset with the minimum capacity loss remaining M S transmit antennas.