Abstract
Through an analytical study of both parallel interference cancellation, decorrelating and MMSE detections in a DS-CDMA (direct-sequence code-division multiple-access) scheme, we derive simple improvements of the previous first structure to achieve better bit-error-rate performance. These schemes are compared with threshold-aided parallel interference cancellation via simulation results over various channels. The signal processing we used is quantified (baseband signals and fixed point calculations) and the synchronization is achieved dynamically as a realistic structure would do.
Résumé
À travers une étude analytique de la suppression paralléle des brouillages, des méthodes de décorrélation et de détection basée sur I’erreur quadratique moyenne, dans un systéme CDMA, l’article propose des améliorations simples d’une précédente structure de réception, permettant l’obtention de meilleures performances. Ces structures sont ensuite comparées avec la suppression seuillée, des brouillages, via des résultats de simulation et différents modèles de canaux. Le traitement de signal mis en œuvre présente la particularité d’être quantifié (signaux en bande de base et calculs en virgule fixe) et la synchronisation est acquise de manière dynamique comme une structure réaliste le ferait.
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This work was supported by the European project ACTS 083 FRANS. It is protected by patent numbers 98 03586, 98 09782 and 98 11335.
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Boulanger, C., Ouvry, L. & Lequepeys, JR. Fixed point multistage DS-CDMA receivers. Ann. Télécommun. 54, 347–358 (1999). https://doi.org/10.1007/BF02997757
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DOI: https://doi.org/10.1007/BF02997757
Key words
- Code division multiple access
- Direct sequence spread spectrum
- Multistage circuit
- Multichannel circuit
- Signal interference
- Decorrelation
- Mean square error
- Fixed point