Spread Spectrum Systems
Coherent Spread Spectrum Systems
Coherent Spread Spectrum Systems
Digital Communications and Spread Spectrum System
Digital Communications and Spread Spectrum System
Rapid coarse acquisition of dsss signals using an expanding-search algorithm
Rapid coarse acquisition of dsss signals using an expanding-search algorithm
| Hi-index | 0.00 |
For coarse acquisition of Direct Sequence Spread Spectrum (DSSS)signals, a search of the possible code phases is required. In cases suchas signal reacquisition, where a priori information is available, the serial search may be abandoned in favor of an expanding search.In this paper, an expanding-search algorithm is presented andcompared to the expanding-sweep algorithms which have beentreated in the literature. Performance results for the serial-searchand the expanding-search algorithms are given.A discussion of the optimality of the serial-search and the expanding-search algorithms is presented. Performance comparisonsof the serial search and the expanding search are made fordifferent a priori code phase probability density functions (pdfs) andthe results are discussed. A technique for determining when the expanding search is an optimal search algorithm is developed andapplied to the performance curves shown previously. The resultsindicate that the expanding search provides a quantifiableimprovement over the serial search when the pdf is somewhatpeaked. The results also indicate that in many cases the expandingsearch may be a more effective search algorithm than the morecommon expanding sweep.