Spreading Code Design Using a Global Optimization Method
Hai Dam (),
Hans-Jürgen Zepernick,
Sven Nordholm and
Jörgen Nordberg
Annals of Operations Research, 2005, vol. 133, issue 1, 249-264
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
Keywords: CDMA; spreading code (search for similar items in EconPapers)
Date: 2005
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DOI: 10.1007/s10479-004-5036-8
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