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Hybrid PN Code Search with Soft-decision Technique  

Lee Seong-Joo (세종대학교 정보통신공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.7A, 2006 , pp. 682-688 More about this Journal
Abstract
In this paper, a soft-decision method for initial PN code acquisition in pilot-channel aided Direct Sequence Code Division Multiple Access (DS-CDMA) systems is proposed in order to improve the acquisition performance. We apply this technique to the conventional hybrid search algorithm and analyze it in terms of mean code acquisition time. For the analysis, we present mathematical model of proposed algorithm and also perform the simulation under IMT-2000 channel models. Numerical results show that our proposed scheme outperforms the conventional one by 0.2 - 0.4 sec with respect to the mean code acquisition time because the soft decision technique can mitigate the possible decline in search performance caused by the use of a hard-decision technique.
Keywords
PN code acquisition; Soft-decision; Hybrid Search; Mean code acquisition time;
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