Title :
Analysis and design of the second order delay-lock loop in a CDMA system
Author :
Olmos, J.J. ; Agustí, R.
Author_Institution :
Dept. de Teoria del Senyal i Comunicacions, Univ. Politecnica de Catalunya, Barcelona, Spain
Abstract :
In code-division multiple access (CDMA) systems a delay-lock loop (DLL) is used to keep a fine alignment between sequences. A simulation program for the second-order DLL has been developed. The program allows an optimum design of the loop low-pass filter in order to guarantee the right clock frequency acquisition and minimum residual jitter. The mean time to lose lock (MTLL) of the DLL has also been obtained by computer simulation for two different shifts between early and late codes. Results show a remarkable sensitivity to the signal-to-noise-ratio in the data bandwidth
Keywords :
code division multiple access; demodulators; linear network synthesis; low-pass filters; mobile radio systems; CDMA; clock frequency acquisition; code-division multiple access; data bandwidth; late codes; loop low-pass filter; mean time to lose lock; mobile radio; optimum design; residual jitter; second order delay-lock loop; sequence alignment; signal-to-noise-ratio; Bandwidth; Clocks; Computational modeling; Computer simulation; Delay systems; Frequency; Jitter; Low pass filters; Multiaccess communication; Signal to noise ratio;
Conference_Titel :
Vehicular Technology Conference, 1992, IEEE 42nd
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0673-2
DOI :
10.1109/VETEC.1992.245436
