Abstract:

Frequency acquisition is an important indicator of system performance of the spread spectrum receiver.Much more captured time and additional resources are required when the received signal that is a combination of several signals.The paper introduces the application of the differential digital matched filter in the spread spectrum communication systems.A multipurpose receiver architecture for acquisition based on the differential digital matched filter is proposed.A two-dimensional search method for Doppler frequency and code phase is converted into one-dimensional search approach for Doppler frequency.The correlation structure in the spread spectrum communication systems is developed,which proves much superior in saving resources and improving efficiency to conventional ones.

Key words: spread spectrum CDMA;differential matched filter;parallel correlation