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Performance Evaluation of Inter-Sector Collaborative PF Schedulers for Multi-User MIMO Transmission Using Zero Forcing  

Lee, Ji-Won (Department of Electronic Engineering, Sogang University)
Sung, Won-Jin (Department of Electronic Engineering, Sogang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.47, no.2, 2010 , pp. 40-46 More about this Journal
Abstract
Multi-user MIMO (Multiple-Input Multiple-Output) systems require collaborative PF schedulers to improve the performance of the log sum of average transmission rates. While the performance of single cell based conventional PF schedulers has been evaluated over various channel conditions, scheduling algorithms by multiple base stations which select multiple users over a given time frame and their performance require further investigations. In this paper, we apply a collaborative PF scheduler to the distributed multi-user MIMO system, which assigns radio resources to multiple users by exchanging user channel information from base stations located in three adjacent sectors. We further evaluate its performance in terms of the log sum of average transmission rates. The performance is compared to that of the full-search collaborative PF scheduler which searches over all possible combinations of user groups, and that of a parallel PF scheduler that determines users without channel information exchange among base stations. We show the log sum of average transmission rates of the collaborative PF scheduler outperforms that of the parallel PF scheduler in low percentile region. In addition, the collaborative PF scheduler exhibits a negligible performance degradation when compared to the full-search collaborative PF scheduler while a significant reduction of the computational complexity is achievable at the same time.
Keywords
Proportional fairness; Multi-user MIMO;
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