An Improved User Selection Algorithm in Multiuser MIMO Broadcast with Channel Prediction

• DOI: 10.1587/transcom.e92.b.2667
• Publication Date: 2009-08-06T06:03:28Z
• Authors: Zhi MIN; Tomoaki OHTSUKI
• Keywords: Orthogonality; Selection algorithm; Diversity gain; Multi-user; Channel state information

In multiuser MIMO-BC (Multiple-Input Multiple-Output Broadcasting) systems, user selection is important to achieve diversity. The optimal algorithm try all the combinations of users find group that can Unfortunately, high calculation cost prevents its implementation. Thus, instead algorithm, some suboptimal algorithms were proposed based on semiorthogonality channel vectors. purpose this paper diversity with a small amount calculation. For purpose, we propose improve orthogonality selected group. We also apply prediction technique system get more accurate information at transmitter. Simulation results show accuracy for selections, and achieves higher sum rate capacity than SUS (Semiorthogonal User Selection) algorithm. Also discuss setting threshold. As result discussion complexity, which uses number complex multiplications as parameter, shown have complexity almost equal they are much lower