International Symposium on Antennas and Propagation
Efficient User Scheduling Algorithm for Zero-Forcing Beamforming in MIMO Broadcast Channels
Seungheon Hyeon, Dae Hee Kim, Song Chul Park, Seungwon Choi,
PDF download (319.5KB)
This paper presents a novel user scheduling algorithm that provides a maximum sum-rate based on zero-forcing beamforming (ZFBF) in multiple-input multiple-output (MIMO) systems. The proposed technique determines primary user pairs of which the sum-rate exceeds the predetermined threshold. To determine the threshold, we define the maximum-sum-rate criterion (MSRC) derived from the extreme value theory (EVT). Applying the MSRC in ZFBF-based user scheduling, we found that the performance of the proposed method is comparable to the exhaustive searching scheme which requires greater computational load. Through computer simulations, we show that the proposed method outperforms the very well-known correlation-based method, semi-orthogonal user selection (SUS), yielding a sum rate that is about 0.56 bps/Hz higher when the transmit SNR is 10dB and the number of users and transmit antennas in a cell is 100 and four, respectively.