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Spreading Code Design Using a Global Optimization Method

Author

Listed:
  • Hai Dam
  • Hans-Jürgen Zepernick
  • Sven Nordholm
  • Jörgen Nordberg

Abstract

The performance of a code division multiple access system depends on the correlation properties of the employed spreading code. Low cross-correlation values between spreading sequences are desired to suppress multiple access interference and to improve bit error performance. An auto-correlation function with a distinct peak enables proper synchronization and suppresses intersymbol interference. However, these requirements contradict each other and a trade-off needs to be established. In this paper, a global two dimensional optimization method is proposed to minimize the out-of-phase average mean-square aperiodic auto-correlation with average mean-square aperiodic cross-correlation being allowed to lie within a fixed region. This approach is applied to design sets of complex spreading sequences. A design example is presented to illustrate the relation between various correlation characteristics. The correlations of the obtained sets are compared with correlations of other known sequences. Copyright Springer Science + Business Media, Inc. 2005

Suggested Citation

  • Hai Dam & Hans-Jürgen Zepernick & Sven Nordholm & Jörgen Nordberg, 2005. "Spreading Code Design Using a Global Optimization Method," Annals of Operations Research, Springer, vol. 133(1), pages 249-264, January.
    • Handle: RePEc:spr:annopr:v:133:y:2005:i:1:p:249-264:10.1007/s10479-004-5036-8
    DOI: 10.1007/s10479-004-5036-8
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    Keywords

    CDMA; spreading code;

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