Abstract: The acquisition of CPICH (common pilot channel) provides the primary scramblingcode of one base station which is the third step of cell search algorithm in WCDMA systems. By modeling the acquisition process, this paper gives the theoretical formula for the detection probability, missing probability and alarm probability in the case of MAI under the single path Rician fading channel. What's more,we analyze the threshold setting rules and detection probability curve.

Key words: multiple access interference, cell search, primary scrambling code