Title :
Enhanced coherent delay tracking for direct sequence spread spectrum systems
Author :
Boujemaa, Hatem ; Siala, Mohamed
Author_Institution :
CNET, Issy-les-Moulineaux, France
Abstract :
An enhanced coherent delay lock loop (DLL) is proposed for code tracking in direct sequence spread spectrum systems on multipath fading channels. By normalising the estimated tracking error for large values of the power of the tracked path, the proposed loop reduces most of the degradation caused by fading. Moreover, by subtracting an estimation of the multipath bias from the output of the coherent DLL, this enhanced scheme reduces most of the degradation caused by multipath interference
Keywords :
delay lock loops; fading channels; land mobile radio; multipath channels; radio tracking; radiofrequency interference; spread spectrum communication; DS-SS systems; UMTS FDD mode specifications; code tracking; coherent DLL; coherent delay lock loop; coherent delay tracking; direct sequence spread spectrum systems; multipath bias estimation; multipath fading channels; multipath interference; normalised estimated tracking error; Bit error rate; Degradation; Delay; Electronic mail; Fading; Filters; Interference cancellation; Spread spectrum communication; Telecommunications; Tracking loops;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2000 IEEE Sixth International Symposium on
Conference_Location :
Parsippany, NJ
Print_ISBN :
0-7803-6560-7
DOI :
10.1109/ISSSTA.2000.878127
