Lattice decoding for joint detection in direct-sequence CDMA systems

Author

Brunel, Loïc ; Boutros, Joseph J.

Author_Institution

Ecole Nat. Superieure des Telecommun., Paris, France

Volume

49

Issue

4

fYear

2003

fDate

4/1/2003 12:00:00 AM

Firstpage

1030

Lastpage

1037

Abstract

A new joint detection method based on sphere packing lattice decoding is presented in this paper. The algorithm is suitable for both synchronous and asynchronous multiple access direct-sequence code-division multiple-access (DS-CDMA) systems, and it may jointly detect up to 64 users with a reasonable complexity. The detection complexity is independent of the modulation size and large M-PAM or M-QAM constellations can be used. Furthermore, a theoretical gain analysis is performed in which the multiple-access system performance is derived from the lattice parameters.

Keywords

code division multiple access; computational complexity; decoding; maximum likelihood decoding; maximum likelihood detection; multiuser detection; pulse amplitude modulation; quadrature amplitude modulation; spread spectrum communication; M-PAM constellation; M-QAM constellation; ML lattice decoder; asynchronous DS-CDMA systems; detection complexity; direct-sequence CDMA systems; direct-sequence code-division multiple-access; gain analysis; joint detection; lattice parameters; maximum likelihood decoder; maximum-likelihood detection; modulation size; multiple-access system performance; sphere packing lattice decoding; synchronous DS-CDMA systems; AWGN; Additive white noise; Detectors; Gaussian noise; Interference cancellation; Lattices; Maximum likelihood decoding; Multiaccess communication; Performance analysis; Performance gain;

fLanguage

English

Journal_Title

Information Theory, IEEE Transactions on

Publisher

ieee

ISSN

0018-9448

Type

jour

DOI

10.1109/TIT.2003.809506

Filename

1193810