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Smart-antenna space-time UMTS uplink processing for system capacity enhancement

AMÉLIORATION DE LA CAPACITÉ DU SYSTÈME PAR TRAITEMENT D’ANTENNE SPATIO-TEMPOREL SUR LA LIAISON MONTANTE UMTS.

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Abstract

The system-level performance of Smart-Antenna Space-Time Uplink processing for the frequency division duplex (fdd) mode in umts is investigated. In this paper, a comparative performance evaluation for space-only and space-time processing techniques for different channel models is done. We study the impact of flat fading and spatio-temporal channel models. The results are expressed in terms of multiple-access noise rise and effective data throughput, which are derived by a stationary system simulator. Smart-antennas provide a clear advantage in mixed rate traffic services in comparison to non-adaptive antennas. The system capacity can be enhanced by a factor of 2.5 or higher, depending on the multi-service mix. In urban environments, the estimated capacity of both conventional and smart-antenna systems is lower-bounded by the capacity obtained under the flat fading assumption. The maximum achievable effective throughput is found as a function of both the service mix and the system loading.

Résumé

Les performances système du traitement ďantenne spatio-temporel sur la liaison montante de ľUMTS en mode duplex fréquentiel sont examinées. Dans cet article, une évaluation comparative des performances pour un traitement seulement spatial et un traitement spatio-temporel est faite pour différents modèles de canaux. Ľimpact des évanouissements plats et des modèles de canal spatio-temporel est étudié. Les résultats obtenus avec un simulateur de système stationnaire sont exprimés en termes de remontée de bruit ďaccès multiple et de débit binaire effectif. Les antennes intelligentes apportent un net avantage pour des services mixtes comparées aux antennes non-adaptatives. La capacité du système peut être améliorée ďun facteur 2,5 ou plus, selon la composition des services. Dans des environnements urbains, la capacité estimée des systèmes classiques et à antennes intelligentes est bornée inférieurement par la capacité obtenue avec ľhypothèse ďévanouissement plat. Le débit effectif maximal que ľon peut atteindre s’exprime comme une fonction de la composition des services et de la charge du système.

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Neubauer, T., Bonek, E. Smart-antenna space-time UMTS uplink processing for system capacity enhancement. Ann. Télécommun. 56, 306–316 (2001). https://doi.org/10.1007/BF03001333

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