On Downlink Beamforming Methods: Capacity and Error Probability Performance

Authors:
Jinho Choi;Seung Won Choi
Affiliations:
School of Electrical Engineering & Telecommunication, University of New South Wales, Sydney, Australia NSW 2052;School of Electrical and Computer Engineering, Hanyang University, Seoul, South Korea
Venue:
Wireless Personal Communications: An International Journal
Year:
2004

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Abstract

In space-division multiple access (SDMA), different beamforming or space-domain precoding techniques can be applied. We investigate two different space-domain precoding methods, the maximum capacity (MC) and the minimum mean square error (MMSE) precoders, for the downlink channel. It is shown that the MMSE precoding, which is practically implementable, can provide a reasonable performance in terms of the capacity and error probability, while the MC precoding is not practical (although it is optimum in terms of the capacity). Space-domain precoding methods are also applied to code-division multiple access (CDMA) systems.