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http://dx.doi.org/10.7840/KICS.2012.37A.1.25

Beamforming Matrix Transformation and User Scheduling for MIMO Systems  

Park, Jong-Rok (연세대학교 전기전자공학과 무선네트워크 연구실)
Lee, Sang-Hoon (연세대학교 전기전자공학과 무선네트워크 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.37, no.1A, 2012 , pp. 25-33 More about this Journal
Abstract
Random beamforming (RBF) uses the signal to interference plus noise ratio (SINR) feedback to select users in multiple-input multiple-output (MIMO) systems. A large number of users are required to obtain the gain of multi-user diversity for a downlink transmission. However, if the number is not large enough, it may be difficult to obtain multi-user diversity, leading to a rapid degradation in performance. To resolve this problem, we propose the beamforming matrix transformation and the user scheduling method. The beamforming matrix transformation scheme uses the SINRs of each users and have a better performance than conventional schemes over a small number of users. In addition, we propose the user scheduling scheme corresponding to the beamforming matrix transformation. In simulation results, we demonstrate that the sum-rate can be improved according to the number of users.
Keywords
Multiple-input multiple-output (MIMO); random beamforming (RBF); beamforming matrix transformation; user scheduling;
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