On the Optimality of Multiuser Zero-Forcing Precoding in MIMO Broadcast Channels

In this paper, we consider a multiuser Gaussian broadcast channel where the base station and the users both are equipped with multiple antennas. The problem of optimal zero-forcing (ZF) precoding design subject to sum power constraint is discussed. Block diagonalization (BD) is applied as the ZF pre...

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Bibliographic Details
Published inIEEE VTS Vehicular Technology Conference (1999) pp. 1 - 5
Main Authors Kaviani, S., Krzymien, W.A.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.04.2009
Subjects
Base stations
Broadcasting
Downlink
Gaussian noise
MIMO
Null space
Quality of service
Receiving antennas
Throughput
Transmitting antennas
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Summary:In this paper, we consider a multiuser Gaussian broadcast channel where the base station and the users both are equipped with multiple antennas. The problem of optimal zero-forcing (ZF) precoding design subject to sum power constraint is discussed. Block diagonalization (BD) is applied as the ZF precoding method. We consider two common optimization criteria: maximum throughput and maximal fairness, where by maximizing fairness we mean maximizing the minimum rate among all users. Under these criteria, the structure of the optimal BD precoders is presented and analyzed. It is shown that the conventional BD precoding design with sum power constraint is indeed optimal under the throughput and fairness criteria.
ISSN:1550-2252
DOI:10.1109/VETECS.2009.5073733