Interference Modelling in DS/CDMA Cellular Systems Operating in a General Fading Environment

  • Authors:

  • A. Sathyendran;K. W. Sowerby;M. Shafi

  • Affiliations:

  • Department of Electrical and Electronic Engineering, University of Auckland, New Zealand.;Department of Electrical and Electronic Engineering, University of Auckland, New Zealand.;Telecom Corporation of New Zealand Ltd, New Zealand, e-mail: kw.sowerby@auckland.ac.nz

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 1997

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Abstract

Multiple access interference and the mobile radio environment are theprimary limitations on the performance of DS/CDMA cellular systems. Thispaper presents the analysis of a DS/CDMA cellular system operating in a“general” fading environment. In particular the issues of signalfading, multiple access interference, and power control are addressed. Acomputationally efficient statistical method is used in the estimation ofsystem performance. It is assumed that the variability of each receivedsignal can be represented by fast Nakagami_m fading plus slower log-normalshadowing. Average bit-error-rate (BER) and outage probability are estimatedas system performance indicators. The analysis shows, that as thevariability of the fast fading of the received signal reduces, theperformance of the system improves. However, when the signal undergoes bothfast fading and shadowing, it is largely the shadowing that determinessystem performance. Use of forward link power control (that compensates forthe variability due to shadowing) results in minimal performanceimprovement. However, in the reverse link significant improvement inperformance can be achieved using a similar power control scheme.