Comparison between the Spectral Efficiency of SDMA Systems and Sectorized Systems

  • Authors:

  • W. S. Au;R. D. Murch;C. T. Lea

  • Affiliations:

  • Department of Electrical and Electronic Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P.R. China;Department of Electrical and Electronic Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P.R. China;Department of Electrical and Electronic Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P.R. China

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2001

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Abstract

In this paper we present a comparison of the spectral efficiency of Spatial Division Multiple Access systems with conventional omni-directionaland sectorized systems. Our analysis attempts to incorporate the effect ofco-channel interference (CCI) for users sharing the same channel within a cell(intra-cell interference) as well as the CCI from other cells (inter-cellinterference). To determine the outage probability we utilize exact resultsfor combined Rayleigh and Log-normal shadowing in conjunction with a genericantenna pattern. The study is limited to the forward link only and theswitched-beam approach. Results are provided for the outage probability andspectral efficiency for various reuse distances and blocking probabilities.These demonstrate that under most conditions, SDMA systems have higherspectral efficiency than conventional omni-directional or sectored systems.Nevertheless under certain conditions such as high blocking probabilities orlarge reuse distances, the spectral efficiency of SDMA systems is lower thanconventional systems.