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Performance Analysis of an Adaptive Hybrid Search Code Acquisition Algorithm for DS-CDMA Systems  

Park Hyung rae (한국항공대학교 대학원 정보통신공학과)
Yang Yeon sil (삼성전자 네트워크 사업부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.3C, 2005 , pp. 83-91 More about this Journal
Abstract
We analyze the performance of an adaptive hybrid search code acquisition algorithm for direct-sequence code division multiple access (DS-CDMA) systems under slowly-moving mobile environments. The code acquisition algorithm is designed to provide the desired feature of constant false alarm rate (CFAR) to cope with nonstationarity of the interference in CDMA forward links. An analytical expression for the mean acquisition time is first derived and the probabilities of detection, miss, and false alarm are then obtained for frequency-selective Rayleigh fading environments. The fading envelope of a received signal is assumed to be constant over the duration of post-detection integration (PDI), considering slow fading environments. Finally, the performance of the designed code acquisition algorithm shall be evaluated numerically to examine the effect of some design parameters such as the sub-window size, size of the PDI, decision threshold, and so on, considering cdma2000 environments.
Keywords
DS-CDMA; Code acquisition; Hybrid search; Mean acquisition time; CFAR;
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