Antenna and user subset selection in downlink multi-user equal rate and BER systems

The downlink of multi-user multiple-input single-output (MU-MISO) wireless system with ERB (equal rate and BER) precoding scheme is considered in this paper, where the base station is equipped with multiple antennas and each mobile user is constrained to a single antenna. Since the number of users supported by the BS is limited by the number of transmit RF chains, the system should exploit user scheduling scheme for user selection. In this paper, we focus on transmit antenna and user selection scheme simultaneously in a MU-MISO system. Because exhaustive search is computationally prohibitive, we propose a suboptimal algorithm for transmit antenna and user subset selection. Then its simplified version with lower complexity is described. The simulation results show the performance of the proposed algorithms is almost the same as the optimal one.