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, La distribution BER tridimensionnelle (3D) indique le taux d'erreur sur les bits atteint après le processus de démodulation par un récepteur situé à un certain point de la pièce

. En, Ceci est une représentation directe des performances du système et de nombreuses caractéristiques peuvent ainsi être obtenues: ? Le débit maximum pouvant être obtenu pour tout utilisateur situé dans la salle avec le BER et une limite FEC connue

?. La, attocell et la portée du système qui sont représentées par la zone où le BER est suffisamment bas pour qu'un utilisateur puisse

, Une remarque importante est que l'attocell dépend également de la méthode multi-accès utilisée. En effet, dans le cas du SCM, la forme d'onde du CAP multi-bande est inchangée et, quel que soit le nombre d'utilisateurs attribués, les caractéristiques du signal ne changeront pas. Dans ce cas, la taille d'attocell ne varie pas avec le nombre d'utilisateurs. Cependant, dans le cas de MC-CDMA, plus on utilise de codes d'étalement, plus il est difficile de maintenir l, ? Une indication générale sur la flexibilité du système multi-utilisateurs basé sur la distribution BER. 8 * 10 ?3

S. Chaque-combinaison-de-cap-multi-bande-avec, P. Mc-cdma-ou, and . Utilise, Cette métrique permet d'évaluer la capacité d'un schéma à servir un utilisateur par rapport au débit qu'il requiert. traduit par une augmentation de la distance de la photodiode à la LED et, comme prévu, par une réduction de la puissance optique reçue. Lorsque vous utilisez la limite de 7 % FEC, cela signifie que tant que le récepteur est placé, le BER étant inférieur à 3,8 * 10 ?3 , le signal peut être entièrement décodé, moyennant un surcoût de 7%. Cela correspond à une superficie mesurée d'environ 4,56 mètres carrés. Dans le cas de SCM, cela signifie que jusqu'à 20 utilisateurs pourraient être desservis sur cette surface de 4,56 m 2 . En effet, sur cette surface, les 20 sous-porteuses peuvent être décodées et sont donc disponibles pour tout utilisateur, une ressource différente pour allouer ses utilisateurs. Afin de mesurer l'efficacité de la méthode d'allocation utilisateur, nous avons défini l'écart par rapport au débit cible

, La différence que PD-NOMA peut apporter, outre l'augmentation de la capacité

, À un écart toléré de 10%, la capacité atteint 14 et enfin, la capacité maximale est de 20 en raison du nombre de sous-porteuses, à des écarts tolérés de 18% et plus. Lors de l'ajout de PD-NOMA, pour un écart toléré de 5 %, la capacité de l'utilisateur est de 12, contre 9 en mode SCM uniquement. À 10%, les capacités de 20 et 19 sont atteintes par la combinaison de PD-NOMA et de SCM, Pour un écart toléré de 5 %, la capacité de l'utilisateur avec SCM est de 9

, En conséquence, un écart toléré de seulement 4 % est nécessaire afin de maximiser la répartition des utilisateurs pour le schéma. Lors de l'ajout de PD-NOMA, au lieu d'un écart toléré de 4 % afin de maximiser la capacité de

, CDMA afin d'atteindre la capacité de 12 utilisateurs En conclusion, le débit total avec une LED blanche commerciale atteint 163 Mb/s avec un taux d'erreur réduit d'un facteur de 3,55 grâce au processus d'optimisation des performances