Detection techniques for code acquisition in direct-sequencespread-spectrum systems employing PN matched filters

摘要

This paper presents threshold detection techniques for directsequence code acquisition employing psuedo-noise (PN) matched filters.The probabilities of detection and false alarm are derived as a measureof the system performance in both nonfading and nonselective Ricianfading channels. For received PN codes with different SNR, the proposedacquisition schemes (serial and parallel) are able to detect a desiredthreshold in the search mode so that this value is utilized as athreshold for the verification mode. It is shown that the serial schemeachieves lower probability of false alarm than the acquisition schemebased on the Neyman-Nearson criterion, giving comparable performance interms of the probability of detection. On the other hand, it its shownthat the parallel scheme is able to provide a sub-optimal thresholdvalue for a wide range of SNR such that the mean acquisition time isminimized