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Pilot-Aided Acquisition Algorithms for Asynchronous DS-CDMA Systems

Pei Xiao (Institutionen för signaler och system, Kommunikationssystem) ; Erik G. Ström (Institutionen för signaler och system, Kommunikationssystem)
European Transactions on Telecommunications (1120-3862). Vol. 14 (2003), 1, p. 89-96.
[Artikel, refereegranskad vetenskaplig]

The problem of estimating propagation delays of orthogonally modulated signals in asynchronous DS-CDMA systems over time-varing Rayleigh-fading channels is treated in this paper. The maximum likelihood (ML) estimator and its unaffordable complexity for implementation are discussed. Some suboptimal solutions, e.g., whitened sliding correlator, MMSE estimator, subspace-based estimator, approximate ML estimator, are proposed to combat the multiple access interference in the fading channels. The performance of these estimators are evaluated with the computer simulations and shown to have better acquisition performance than the standard sliding correlator. They also achieve reduced computational complexity compared with the ML estimator, while maintaining an acceptable performance degradation.

Nyckelord: CDMA



Denna post skapades 2006-09-12. Senast ändrad 2013-06-10.
CPL Pubid: 15099

 

Institutioner (Chalmers)

Institutionen för signaler och system, Kommunikationssystem

Ämnesområden

Information Technology

Chalmers infrastruktur