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

fYear

1992

fDate

10-13 May 1992

Firstpage

221

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1992, IEEE 42nd

Conference_Location

Denver, CO

ISSN

1090-3038

Print_ISBN

0-7803-0673-2

Type

conf

DOI

10.1109/VETEC.1992.245436

Filename

245436