Parallel interference cancellation efficiency for noisy signals in O-CDMA system

Efficacité de L’annulation Parallèle D’interférence en Présence de Signaux Bruités dans un Système DS-OCDMA

Abstract

The aim of this paper is to evaluate the robustness of Parallel Interference Cancellation (Pic) to noise contribution for an optical Code Division Multiple Access system. The theoretical expression of thePic error probability is developed in the case of white additive Gaussian noise. From theoretical analysis, we show that, even with noise contribution, thePic receiver outperforms the Conventional Correlation Receiver (Ccr). Moreover, the results highlight that, for a given performance, thePic receiver relaxes not only the constraint on the code length, but also the Signal to Noise Ratio compared toCcr. Particularly, this is proofed in access network context, i.e. 30 users withBer lt; 10−9.

Résumé

Le but de cet article est d’évaluer la robustesse de l’Annulation Parallèle d’Interférence (Pic) au bruit dans un système optique à répartition de codes à séquence directe. L’expression théorique de la probabilité d’erreur d’un tel récepteur est développée dans le cas d’un bruit blanc additif gaussien. A partir de résultats théoriques, nous montrons que, même en présence de bruit, le récepteur pic est plus performant que le récepteur classique par corrélation (Ccr). De plus, les résultats soulignent que, pour une performance donnée, l’utilisation du pic permet non seulement de réduire la contrainte sur la longueur du code, mais aussi le rapport signal à bruit (Snr), en comparaison avec leCr. En particulier, ceci a été vérifié dans le contexte des réseaux d’accès, c’est-à-dire pour 30 utilisateurs avec un taux d’erreurs binaires inférieur à 10−9.

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ClaireGoursaudreceived her Diplôme d’Ingénieur degree from the École Nationale Supérieure d’Ingénieurs de Limoges (Ensil), University of Limoges, France in 2003. She continued her studies as a doctorate student (PhD) in the research group ofEnsil. Her research work deals with the study of the digital signal processing techniques applied to Optical Code Division Multiple Access.

AnneJulien-Vergonjanne received her Ph.D in Microwave and Optical Communications from the University of Limoges in 1987. She joined the École Nationale Supérieure d’Ingénieurs de Limoges (Ensil), University of Limoges, as Assistant Professor of Electronics and Telecommunications in 1997. Her current research interests deal with digital signal processing for communications and especially with theory and implementation of signal processing for OpticalCdma systems.

ChristelleAupetit-Berthelemotreceived her Diplôme d’Ingénieur degree from the Ecole Nationale Supérieure d’Ingénieurs de Limoges (Ensil), University of Limoges, France in 1995. She received her Ph.D degree from University of Limoges and Optical Communications from the University of Limoges in 1998. She is now an assistant-professor in Electronics and Telecommunications atEnsil — University of Limoges. Her current research interests include optoelectronic devices, fiber-optic communication systems and OpticalCdma systems.

Jean-PierreCances graduated in Electrical Engineering from École Nationale Supérieure des Télécommunications (Enst) Bretagne in 1990. He received his Ph.D degree fromEnst Paris in satellite communications engineering in 1993. He is now an assistant professor at the École Nationale Supérieure d’Ingénieurs de Limoges (Ensil), University of Limoges. His current research interests include satellite communication systems,Cdma multiuser detection, multicarrier modulation and synchronization algorithms.

Jean-MichelDumas received his Diplôme d’Ingénieur degree from the Institut National des Sciences Appliquées of Toulouse, University of Toulouse, in 1973 and the Doctorat ès-Sciences Physiques degree from the University of Limoges in 1985. He was a member of the technical staff of France Télécom/Centre National d’Etudes des Télécommunications (France TélécomR&d/cnet) in Lannion till 1994. Then, he joined the Ecole Nationale Supérieure d’Ingénieurs de Limoges (Ensil), University of Limoges, as Professor of Electronics and Telecommunications. AtEnsil, he leads a research group involved in the insertion of high speed devices into systems and the simulation of digital communication systems.

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Goursaud, C., Julien-Vergonjanne, A., Aupetit-Berthelemot, C. et al. Parallel interference cancellation efficiency for noisy signals in O-CDMA system. Ann. Télécommun. 61, 645–661 (2006). https://doi.org/10.1007/BF03219927

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Key words

  • Cdma
  • Optical telecommunication
  • Signal interference
  • Additive white Gaussian noise
  • Signal cancellation
  • Parallel system

Mots clés

  • Accès multiple code
  • Télécommunication optique
  • Brouillage signal
  • Bruit blanc gaussien additif
  • Annulation signal
  • Système parallèle