Eavesdropping in the synchronous CDMA channel: an EM-based approach

Author

Yao, Yingwei ; Poor, H. Vincent

Author_Institution

Dept. of Electr. Eng., Princeton Univ., NJ, USA

Volume

49

Issue

8

fYear

2001

fDate

8/1/2001 12:00:00 AM

Firstpage

1748

Lastpage

1756

Abstract

The problem of blind detection in a synchronous code division multiple access (CDMA) system when there is no knowledge of the users´ spreading sequences is considered. An expectation maximization (EM)-based algorithm that exploits the finite alphabet (FA) property of the digital communications source is proposed. Simulations indicate that this approach, which makes use of knowledge of the subspace spanned by the signaling multiplex, achieves the Cramer-Rao lower bound (CRB). The issues of subspace estimation and timing acquisition are also considered

Keywords

code division multiple access; digital radio; fading channels; multipath channels; multiuser channels; optimisation; parameter estimation; signal detection; spread spectrum communication; synchronisation; timing; CDMA system; CRB; Cramer-Rao lower bound; EM-based approach; blind detection; digital communications source; eavesdropping; expectation maximization-based algorithm; fading channel; finite alphabet; multipath channel; signaling multiplex; simulations; spreading sequences; subspace estimation; synchronous CDMA channel; synchronous code division multiple access; timing acquisition; Algorithm design and analysis; Array signal processing; Clustering algorithms; Code division multiplexing; Direction of arrival estimation; Iterative algorithms; Maximum likelihood estimation; Multiaccess communication; Signal processing; Timing;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/78.934146

Filename

934146