On code tracking in direct sequence spread spectrum systems using adaptive filtering techniques

This paper investigates the tracking of DS/SS signals based on an adaptive filtering technique. It is shown that a previously proposed system for code acquisition is also capable of code tracking and, by performing both acquisition and tracking with the same circuitry, significant simplification in the overall DS/SS receiver is gained. Analytical results show that the proposed scheme has a good tracking performance, as measured by the hold-in time and the false alarm penalty time, and less sensitivity to variations in the received SNR compared to conventional delay lock loops (DLLs)