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http://dx.doi.org/10.7840/kics.2015.40.4.646

Dynamic Feedback Selection Scheme for User Scheduling in Multi-user MIMO Systems  

Kim, I-Cheon (고려대학교 전기전자전파공학과 무선정보시스템공학 연구실)
Kang, Chung G. (고려대학교 전기전자전파공학과 무선정보시스템공학 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.40, no.4, 2015 , pp. 646-652 More about this Journal
Abstract
In this paper, the system-level performance is evaluated for the feedback scheme on the pre-coding matrix index (PMI) and channel quality indication (CQI), which are required for user selection in the multi-user MIMO system. Our analysis demonstrates that the number of users, the number of selected users, and codebook size are the key factors that govern the performance of the best companion grouping (BCG)-based user scheduling. Accordingly, we have confirmed that the probability of forming the co-scheduled user group is determined by these factors, which implies that the number of PMI's and codebook size can be dynamically determined so as to maximize the average system throughput as the number of users varies in the cell.
Keywords
Multi-user Multi-Input Multi-Output (MU-MIMO); closed-loop MIMO; user scheduling; precoding matrix index (PMI); channel quality indication (CQI); dynamic feedback selection (DFS);
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