Abstract
The present paper deals with the problem of data detection in direct-sequence code-division multiple-access (CDMA) systems with non-Gaussian ambient noise. This issue arises in pratical situations because many physical channels in which multiple-access communications is applied are known to be decidedly non-Gaussian, due largely to impulsive phenomena. (Such channels include urban and indoor radio channels, and underwater acoustic-modem channels). The optimum multiuser detector for the additive noise channel model is derived, and several suboptimal multiuser detectors are proposed. Moreover, for performance comparison purposes the robust multiuser detector, recently proposed in the literature, is also considered.
Résumé
L’article étudie la détection de données dans les systèmes d’accès multiple par répartition en code utilisant la méthode de séquence directe, en présence de bruit ambiant non gaussien. Ce problème intervient dans des situations pratiques puisque de nombreux canaux physiques sur lesquels on emploie des communications à accès multiple sont notoirement connus comme non gaussiens, principalement à cause de phénomènes impulsifs. (Ce sont notamment des canaux radioélectriques en zone urbaine ou à l’intérieur des bâtiments, ainsi que des canaux sous-marins à modem acoustique). Le détecteur multiutilisateur optimal est déterminé pour le modèle de canal à bruit additif et plusieurs détecteurs suboptimaux sont proposés. Pour permettre de comparer les performances, on considère aussi le détecteur multiutilisateur robuste.
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This research was supported in part by the U. S. National Science Foundation under Grant NCR-9613108.
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Poor, H.V., Tanda, M. Multiuser detection in impulsive channels. Ann. Télécommun. 54, 392–400 (1999). https://doi.org/10.1007/BF02997761
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DOI: https://doi.org/10.1007/BF02997761
Key words
- Code division multiple access
- Direct sequence spread spectrum
- Non Gaussian noise
- Impulsive noise
- Optimal detection
- Complex signal
- Numerical simulation