Open Access

On Sum Rate and Power Consumption of Multi-User Distributed Antenna System with Circular Antenna Layout

  • Jiansong Gan1Email author,
  • Yunzhou Li1,
  • Limin Xiao1,
  • Shidong Zhou1 and
  • Jing Wang1
EURASIP Journal on Wireless Communications and Networking20072007:089780

DOI: 10.1155/2007/89780

Received: 18 November 2006

Accepted: 29 July 2007

Published: 28 August 2007

Abstract

We investigate the uplink of a power-controlled multi-user distributed antenna system (DAS) with antennas deployed on a circle. Applying results from random matrix theory, we prove that for such a DAS, the per-user sum rate and the total transmit power both converge as user number and antenna number go to infinity with a constant ratio. The relationship between the asymptotic per-user sum rate and the asymptotic total transmit power is revealed for all possible values of the radius of the circle on which antennas are placed. We then use this rate-power relationship to find the optimal radius. With this optimal radius, the circular layout DAS (CL-DAS) is proved to offer a significant gain compared with a traditional colocated antenna system (CAS). Simulation results are provided, which demonstrate the validity of our analysis.

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Authors’ Affiliations

(1)
Department of Electronic Engineering, Tsinghua University

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Copyright

© Jiansong Gan et al. 2007

This article is published under license to BioMed Central Ltd. 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.