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Effects of Multiple Threshold Values for PN Code Acquisition in DS-CDMA Systems  

Lee, Seong-Ju (Dept.of Electric Electronics Engineering, Yonsei University)
Kim, Jae-Seok (Dept.of Electric Electronics Engineering, Yonsei University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.39, no.1, 2002 , pp. 42-48 More about this Journal
Abstract
In this paper, a decision method using multiple threshold values for PN code acquisition in Direct Sequence Code Division Multiple Access (DS-CDMA) systems is described. We apply this technique to the conventional double dwell serial 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 - 0.5 sec with respect to the mean code acquisition time because multiple threshold values mitigate the possible decline in search performance caused by the use of a single threshold.
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