Angle-of-Departure-Aided Opportunistic Space-Division Multiple Access
CNSR '09 Proceedings of the 2009 Seventh Annual Communication Networks and Services Research Conference
On throughput-fairness tradeoff in virtual MIMO systems with limited feedback
EURASIP Journal on Wireless Communications and Networking - Special issue on fairness in radio resource management for wireless networks
A simple dual-mode limited feedback multiuser downlink system
IEEE Transactions on Communications
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Opportunistic beamforming systems with diversity combining
ICICS'09 Proceedings of the 7th international conference on Information, communications and signal processing
Multiuser diversity gain in cognitive networks
IEEE/ACM Transactions on Networking (TON)
Wireless Communications & Mobile Computing
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This work investigates the following question: subject to strictly limited (finite-rate) feedback in a multi-user multi-antenna system, what channel state information (CSI) should we send back to the transmitter, and how should it be used? Considering the class of single-beam systems, we suggest a combination of beamforming (array gain) and multi-user diversity. It has been shown that in single antenna systems, one bit of feedback per user can capture almost all gains available due to multi-user diversity, therefore we propose and analyze a compound strategy that uses one bit for multi-user diversity and any further feedback bits for beamforming. We obtain the scaling laws of this compound strategy, showing that it scales as well as any single-beam system with full transmit-CSI.