System performance analysis of situation awareness messaging using narrow-band multi-user detection

  • Authors:

  • Mark Rice;Tim Giles;Michael Peake

  • Affiliations:

  • DSpace Pty Ltd., Innovation House, First Avenue, Mawson Lakes, Technology Park, SA 5095, Australia;DSpace Pty Ltd., Innovation House, First Avenue, Mawson Lakes, Technology Park, SA 5095, Australia;DSpace Pty Ltd., Innovation House, First Avenue, Mawson Lakes, Technology Park, SA 5095, Australia

  • Venue:
  • Digital Signal Processing
  • Year:
  • 2009

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Abstract

This paper is concerned with enhancing situation awareness messaging using narrow-band multi-user detection techniques. Situation awareness messaging involves sending short packets of situation update data. Low latency is an important requirement. This paper focuses on using satellite communications which have a substantial propagation delay. These factors favour the use of a random access system such as Aloha. The main draw back of these systems is low channel utilisation. The capacity of an Aloha system using multi-user detection is analysed is this paper. The capacity is substantially improved by using multi-user detectors. Furthermore the distribution of user powers experienced at the ground station enhances the performance of a system based on multi-user detection.