The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Cet article présente un nouveau schéma d'annulation d'interférence (IC) pour les canaux sans fil à accès multiple par répartition en code à séquence directe (DS-CDMA) synchrones et asynchrones. Dans le système DS-CDMA, l'interférence d'accès multiple (MAI) et le problème de proximité (NFP) sont les deux facteurs qui réduisent la capacité du système. Dans cet article, nous proposons un nouvel algorithme capable de détecter tous les signaux d'interférence en tant que signal MAI individuel par détection de corrélation maximale. Elle repose sur la découverte de tous les codes de propagation inconnus des signaux interférentiels. Ensuite, tous les modèles MAI possibles, appelés répliques, sont générés sous la forme d'une sommation de signaux d'interférence. Et le véritable modèle MAI est trouvé en prenant la corrélation entre le signal reçu et les répliques. De plus, le récepteur exécute l'annulation MAI de manière successive, supprimant tous les signaux d'interférence en une seule étape. Les résultats numériques montreront que la stratégie IC proposée, qui atténue l'effet néfaste du MAI et le problème de proximité, peut améliorer considérablement les performances du système. En particulier, nous pouvons obtenir presque les mêmes caractéristiques de réception qu'en l'absence d'interférence pour un système asynchrone lorsque les puissances reçues sont égales. En outre, les mêmes performances peuvent être observées dans n’importe quel état de puissance reçue pour un système synchrone.
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Ranga HETTIARACHCHI, Mitsuo YOKOYAMA, Hideyuki UEHARA, "Interference Cancellation Technique Based on Discovery of Spreading Codes of Interference Signals and Maximum Correlation Detection for DS-CDMA System" in IEICE TRANSACTIONS on Fundamentals,
vol. E91-A, no. 11, pp. 3335-3345, November 2008, doi: 10.1093/ietfec/e91-a.11.3335.
Abstract: This paper presents a novel interference cancellation (IC) scheme for both synchronous and asynchronous direct-sequence code-division multiple-access (DS-CDMA) wireless channels. In the DS-CDMA system, the multiple access interference (MAI) and the near-far problem (NFP) are the two factors which reduce the capacity of the system. In this paper, we propose a new algorithm that is able to detect all interference signals as an individual MAI signal by maximum correlation detection. It is based on the discovery of all the unknowing spreading codes of the interference signals. Then, all possible MAI patterns so called replicas are generated as a summation of interference signals. And the true MAI pattern is found by taking correlation between the received signal and the replicas. Moreover, the receiver executes MAI cancellation in a successive manner, removing all interference signals by single-stage. Numerical results will show that the proposed IC strategy, which alleviates the detrimental effect of the MAI and the near-far problem, can significantly improve the system performance. Especially, we can obtain almost the same receiving characteristics as in the absense of interference for asynchrnous system when received powers are equal. Also, the same performances can be seen under any received power state for synchronous system.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1093/ietfec/e91-a.11.3335/_p
Copier
@ARTICLE{e91-a_11_3335,
author={Ranga HETTIARACHCHI, Mitsuo YOKOYAMA, Hideyuki UEHARA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Interference Cancellation Technique Based on Discovery of Spreading Codes of Interference Signals and Maximum Correlation Detection for DS-CDMA System},
year={2008},
volume={E91-A},
number={11},
pages={3335-3345},
abstract={This paper presents a novel interference cancellation (IC) scheme for both synchronous and asynchronous direct-sequence code-division multiple-access (DS-CDMA) wireless channels. In the DS-CDMA system, the multiple access interference (MAI) and the near-far problem (NFP) are the two factors which reduce the capacity of the system. In this paper, we propose a new algorithm that is able to detect all interference signals as an individual MAI signal by maximum correlation detection. It is based on the discovery of all the unknowing spreading codes of the interference signals. Then, all possible MAI patterns so called replicas are generated as a summation of interference signals. And the true MAI pattern is found by taking correlation between the received signal and the replicas. Moreover, the receiver executes MAI cancellation in a successive manner, removing all interference signals by single-stage. Numerical results will show that the proposed IC strategy, which alleviates the detrimental effect of the MAI and the near-far problem, can significantly improve the system performance. Especially, we can obtain almost the same receiving characteristics as in the absense of interference for asynchrnous system when received powers are equal. Also, the same performances can be seen under any received power state for synchronous system.},
keywords={},
doi={10.1093/ietfec/e91-a.11.3335},
ISSN={1745-1337},
month={November},}
Copier
TY - JOUR
TI - Interference Cancellation Technique Based on Discovery of Spreading Codes of Interference Signals and Maximum Correlation Detection for DS-CDMA System
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 3335
EP - 3345
AU - Ranga HETTIARACHCHI
AU - Mitsuo YOKOYAMA
AU - Hideyuki UEHARA
PY - 2008
DO - 10.1093/ietfec/e91-a.11.3335
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E91-A
IS - 11
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - November 2008
AB - This paper presents a novel interference cancellation (IC) scheme for both synchronous and asynchronous direct-sequence code-division multiple-access (DS-CDMA) wireless channels. In the DS-CDMA system, the multiple access interference (MAI) and the near-far problem (NFP) are the two factors which reduce the capacity of the system. In this paper, we propose a new algorithm that is able to detect all interference signals as an individual MAI signal by maximum correlation detection. It is based on the discovery of all the unknowing spreading codes of the interference signals. Then, all possible MAI patterns so called replicas are generated as a summation of interference signals. And the true MAI pattern is found by taking correlation between the received signal and the replicas. Moreover, the receiver executes MAI cancellation in a successive manner, removing all interference signals by single-stage. Numerical results will show that the proposed IC strategy, which alleviates the detrimental effect of the MAI and the near-far problem, can significantly improve the system performance. Especially, we can obtain almost the same receiving characteristics as in the absense of interference for asynchrnous system when received powers are equal. Also, the same performances can be seen under any received power state for synchronous system.
ER -