Estimation of time delays in multirate asynchronous DS-CDMA systems

Author

Östman, Thomas ; Ottersten, Bjöm E. ; Milstein, Laurence B.

Author_Institution

Signal Process., R. Inst. of Technol., Stockholm, Sweden

Volume

1

fYear

1998

fDate

2-4 Sep 1998

Firstpage

97

Abstract

This article treats the problem of time delay estimation in a multirate asynchronous direct-sequence code-division multiple access (DS-CDMA) system in a near-far scenario. A subspace based algorithm for the time delay estimation problem is proposed. The algorithm is a minor modified version of the MUSIC estimator proposed by Ostman, Parkvall and Ottersten (see Proceedings of the 31st Asilomar Conference on Signals, Systems and Computers, 1997). Through theoretical analysis and simulations it is shown that the subspace approach to time delay estimation in a multirate DS-CDMA system is applicable when the algorithm is applied in a way such that the low-rank structure of the system is conserved

Keywords

AWGN channels; code division multiple access; delay estimation; multiuser channels; pseudonoise codes; spread spectrum communication; AWGN channel; MUSIC estimator; direct-sequence code-division multiple access; low-rank structure; multirate asynchronous DS-CDMA systems; near-far problem; short spreading codes; simulations; subspace based algorithm; time delay estimation; AWGN; Delay effects; Delay estimation; Direct-sequence code-division multiple access; Filters; Multiaccess communication; Multiple signal classification; Niobium; Signal processing; Signal processing algorithms;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications, 1998. Proceedings., 1998 IEEE 5th International Symposium on

Conference_Location

Sun City

Print_ISBN

0-7803-4281-X

Type

conf

DOI

10.1109/ISSSTA.1998.726204

Filename

726204