Spreading code design using a global optimization method

Hai Huyen Dam

doi:10.1007/s10479-004-5036-8

Spreading code design using a global optimization method

2005-01-01

2

PRE

AI

H

Hai Huyen Dam *

H

Hans‐Jürgen Zepernick

DOI：10.1007/s10479-004-5036-8

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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.

Keyword:

CDMA

spreading code

Spreading code design using a global optimization method

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