MULTIUSER OFDM-MIMO EFFECT WITH FAIR RESOURCE ALLOCATION IN ACTUAL INDOOR MULTIPATH ENVIRONMENT

摘要

In this paper we evaluate the measured Multi-user MIMO effect with fair resource allocation by using a MU-MIMO test-bed, which can evaluate 8×8 MIMO channel in an indoor multipath environment. MU-MIMO systems have attracted attention as a technology for increasing the total system capacity. However, unlike single user MIMO (SU-MIMO) systems, multiple receivers cannot cooperate with each other. Thus, the transmit beamforming method at the access point should be designed to cope with interference among multiple spatial channels. Although several approaches to beamforming have been proposed for MU-MIMO systems depending on the degree of awareness of fairness among multiple mobile stations, we focus on a fair resource allocation approach that evenly assigns transmission time to each terminal in order to support terminal diversity better. Although most papers discuss the MU-MIMO effect based on computer simulations or theoretical analysis, only a few measured results have been presented. In this paper, the numbers of users and antennas at the mobile station suitable for MU-MIMO with fair resource allocation are discussed.