Spatial Transmission Mode Switching in Multi-User MIMO-OFDM Systems With User Fairness

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Executive Summary

Multi-antenna radio systems allow to access the channel in diversity or spatial multiplexing mode. Adequate switching between these modes according to current channel conditions was shown to yield significant performance improvements while requiring little feedback from the receiving side. The authors present a transmission concept for the downlink of a multiuser MIMO-OFDM system aiming at high user rates with limited feedback demands. An extended score-based scheduling approach ensures a fair resource allocation to the users, while transmission mode switching is used to guarantee high user rates. The degree of fairness of the scheduler can be adapted by adequately configuring a weighting function for the scores. Comparison to single-mode schemes reveals substantial throughput gains of the adaptive switching concept.

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