Fair user selection for zero-forcing precoding in multi-user MISO systems

Authors:
Nicolas Schrammar;Peter A. Hoeher
Affiliations:
School of Electrical Engineering and ACCESS Linnaeus Center, KTH, Royal Institute of Technology, Stockholm, Sweden;Faculty of Engineering, University of Kiel, Kiel, Germany
Venue:
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
Year:
2009

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Abstract

We analyze a multi-user MISO system employing zero-forcing precoding and user scheduling with an adjustable amount of fairness at the transmitter. The system shows a significant gain in sum-rate from multi-user diversity, even for a small number of users. Furthermore, a large fraction of this gain is attained even if the system is constraint to be as fair as the Round-Robin scheduler. The performance of the fair scheduler shows to be unaffected by partial channel state information at the transmitter in the slow fading regime.