Threshold decision technique for direct sequence code synchronisation in a fading mobile channel

The work presents the performance of a threshold decision technique for direct-sequence spread-spectrum code synchronisation. For received PN codes with different SNR, this scheme is able to detect a desired threshold value for verification in the search mode such that the detection probability of the verification mode is maximised and the false alarm probability of the verification mode is minimised. The proposed serial acquisition system is compared to the conventional serial acquisition system, and a significant improvement of performance is shown. Analysis of system performance in both the search and verification modes is presented, and key quantities such as the false alarm probability, the detection probability, and the mean acquisition time are derived in both nonfading and Rayleigh fading environments