Abstract
In this paper, multicarrier techniques are considered in the context of the future wideband wireless networks. An overview of the different access schemes based on a combination of code division and multicarrier techniques, such as Multi-Carrier Code Division Multiple Access (MC-CDMA), Multi-Carrier Direct Sequence CDMA (MC-DS-CDMA) and Multi-Tone CDMA (MT-CDMA) is presented first. Afterwards, MC-CDMA systems are considered for the downlink of high rate cellular networks. The performance of different mono-user detection techniques are first analytically estimated and then compared with the help of Monte Carlo simulations for a Rayleigh channel. Simulation results on the performance of mono-user and multi-user detection techniques are also provided for Bad Urban (BU) Hilly Terrain (HT) and Vehicular UMTS channels. With regard to the channel coding, convolutional codes and turbo-codes are considered. Among others, a new linear detection technique named Global Minimum Mean Square Error Algorithm (GMMSE) is compared to multi-user Parallel Interference Cancellation detection technique. It is shown that GMMSE offers good performance especially for non-full load systems. Thus, the efficiency of MC-CDMA as a very promising multiple access and robust modulation scheme is successfully demonstrated for the downlink of the future wideband mobile networks.
Résumé
Cet article a pour but ďétudier les techniques de modulation multiporteuses dans le contexte des futurs reseaux sans fil à large bande. Les différents systèmes combinant des techniques à porteuses multiples et des techniques ďaccès multiple par répartition en code (AMRC), notamment ľAMRC multiporteuse ou MC-CDMA, ľAMRC multiporteuses à séquence directe ou MC-DS-CDMA et ľAMRC multipilote ou MT-CDMA, sont tout ďabord présentés. Puis, les systèmes MC-CDMA sont étudiés pour la liaison descendante de réseaux cellu-laires è haut débit. Les performances de différentes techniques de détection mono-utilisateurs sont estimées analytiquement puis par simulation pour un canal de Rayleigh. Les résultats de simulation comparant les performances de techniques de détection mono et multi-utilisateurs pour des canaux de type “Bad Urban” (BU), “Hilly Terrain” (HT) et “Vehicular” sont ensuite présentés. Pour ces comparaisons, des codes convolutifs et des turbo-codes sont mis en oeuvre. D’autre part, une nouvelle technique de détection appelée “Global Minimum Mean Square Error Algorithm ” (GMMSE) est comparée aux techniques de détection multi-utilisateurs à annulation parallèle des brouillages. Il est démontré que ľalgorithme GMMSE offre de bonnes performances en particulier lorsque le réseau n’est pas à pleine charge. Ainsi, les systèmes MC-CDMA apparaissent comme une technique ďaccès multiple tres prometteuse et tres robuste pour la liaison descendante des futurs reseaux mobiles à large bande.
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Hélard, M., Le Gouable, R., Hélard, JF. et al. Multicarrier CDMA techniques for future wideband wireless networks. Ann. Télécommun. 56, 260–274 (2001). https://doi.org/10.1007/BF03001330
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DOI: https://doi.org/10.1007/BF03001330
Key words
- Mobile radiocommunication
- Code division multiple
- access
- Wide band transmission
- Multicarrier modulation
- Direct
- sequence spread spectrum
- Cellular networks
- Channel coding
- Convolutional code
- Turbo code
- Signal detection