Space Time Spreading with modified Walsh-Hadamard sequences

P. Vial, B. J. Wysocki, I. Raad, T. Wysocki

Research output: Contribution to conferencePaper

8 Scopus citations

Abstract

Previous work has shown that the performance of a Space Time Spreading (STS) system using walsh codes with two transmit antennas at the Base Station (BS) is degraded in the presence of mutual interference from adjacent sectors in the same cell. In this paper we use Modified Walsh-Hadamard sequences exhibiting improved cross-correlation performance, which potentially mitigates the effects of MAI (Multiple Access Interference). The presented study also looks at variation of sets of different Modified Walsh-Hadamard codes being used by the adjacent interferer, with a hundred randomly selected pairings being chosen, as well as the case where one set of alternate codes is used. It is shown using simulation that significant improvement of the order of 0.5-2 dB is possible using these sequences instead of the standard Walsh code previously proposed.

Original languageEnglish (US)
Pages943-946
Number of pages4
StatePublished - 2004
Externally publishedYes
Event2004 IEEE International Symposium on Spread Spectrum Techniques and Applications, ISSSTA 2004 - Sydney, Australia
Duration: Aug 30 2004Sep 2 2004

Other

Other2004 IEEE International Symposium on Spread Spectrum Techniques and Applications, ISSSTA 2004
CountryAustralia
CitySydney
Period8/30/049/2/04

Keywords

  • Modified Walsh-Hadamard Codes
  • Multiple Access Interference (MAI)
  • Space Time Spreading
  • Spreading Sequences
  • Walsh Codes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering

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  • Cite this

    Vial, P., Wysocki, B. J., Raad, I., & Wysocki, T. (2004). Space Time Spreading with modified Walsh-Hadamard sequences. 943-946. Paper presented at 2004 IEEE International Symposium on Spread Spectrum Techniques and Applications, ISSSTA 2004, Sydney, Australia.