Optimization of symbol timing recovery for multi-user DS-CDMA receivers

Author

Simon, Eric ; Raoof, Kosaï ; Ros, Laurent

Author_Institution

Lab. LIS, ENSIEG, Saint Martin d´´Heres, France

Volume

4

fYear

2003

fDate

6-10 April 2003

Abstract

We consider a direct-sequence code-division multiple-access system operating in the downlink. We propose to improve the performances of a conventional delay tracking algorithm, i.e. the early-late algorithm, by prefiltering the received signal. This concept has been studied by A.N. D\´Andrea and M. Luise (see IEEE Trans. Commun., vol.44, p.399-406, 1996) for the clock recovery scheme proposed by F.M. Gardner (see IEEE Trans. Commun., vol.34, p.423-9, 1986). Our main contribution is to extend this concept in a multi-user CDMA context. We treat multiple-access interference and deal with the two "timing scales", i.e. symbol and chip duration, due to the spread spectrum. The analysis shows improved tracking performances in comparison to the standard early-late algorithm.

Keywords

code division multiple access; delays; filtering theory; multiuser detection; optimisation; radiofrequency interference; spread spectrum communication; synchronisation; timing; chip duration; delay tracking algorithm; direct-sequence code-division multiple-access system; downlink; early-late algorithm; multiple-access interference; multiuser DS-CDMA receivers; multiuser receivers; prefiltering; spread spectrum; symbol duration; symbol timing recovery optimization; AWGN; Baseband; Clocks; Delay estimation; Downlink; Filters; Intersymbol interference; Multiaccess communication; Multiple access interference; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on

ISSN

1520-6149

Print_ISBN

0-7803-7663-3

Type

conf

DOI

10.1109/ICASSP.2003.1202715

Filename

1202715