THRESHOLD DECISION TECHNIQUE FOR DIRECT-SEQUENCE CODE SYNCHRONIZATIONIN A FADING MOBILE CHANNEL

The work presents the performance of a threshold decision technique fo r direct-sequence spread-spectrum code synchronisation. For received P N codes with different SNR. this scheme is able to detect a desired th reshold value for verification in the search mode such that the detect ion probability of the verification mode is maximised and the false al arm probability of the verification mode is minimised. The proposed se rial acquisition system is compared to the conventional serial acquisi tion system, and a significant improvement of performance is shown. An alysis 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.