Modeling of code acquisition process in CDMA networks - Asynchronous systems

In this paper, we discuss modeling of serial code acquisition process in a code division multiple access (CDMA) network. Due to multiple access interf erence (MAI), the process is characterized by a different probability of si gnal detection P-D and probability of a false alarm P-FA in each cell of th e code delay uncertainty region. We derive exact expressions for average co de acquisition time and its variance. In addition to this, we also present several useful approximations, which enable easy engineering use of these r esults for practical applications in future universal mobile telecommunicat ions system (UMTS) solutions. Numerical results based on this analysis are used for decision threshold optimization in code acquisition process for as ynchronous CDMA networks.