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International Journal of Antennas and Propagation
Volume 2012, Article ID 454210, 10 pages
http://dx.doi.org/10.1155/2012/454210
Research Article

Reduced-Complexity Radio Architectures for Enhanced Receive Selection Combining in Multiuser Diversity Systems

1Broadband Wireless and Sensor Networks Group, Athens Information Technology, 19002 Athens, Greece
2Department of Electronic Systems, Aalborg University, 9220 Aalborg East, Denmark

Received 1 August 2011; Revised 16 November 2011; Accepted 4 December 2011

Academic Editor: Li Yang

Copyright © 2012 Elpiniki P. Tsakalaki et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Although antenna selection is a simple and efficient technique for enhancing the downlink performance of multiuser diversity systems, the large antenna interelement spacing required for achieving spatial diversity is prohibitive for user terminals due to size restrictions. In order to allay this problem, we propose miniaturized switched beam receiver designs assisted by low-cost passive reflectors. Unlike conventional spatial receive diversity systems, the proposed angular diversity architectures occupy a small volume whereas the antenna system properties are optimized by controlling the strong reactive fields present at small dimensions. The systems are designed for maximum antenna efficiency and low interbeam correlation, thus yielding N practically uncorrelated receive diversity branches. The simulation results show that the proposed enhanced diversity combining systems improve the average throughput of a multiuser network outperforming classical antenna selection especially for small user populations and compact user terminal size.