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".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Un nouvel algorithme d'estimation de synchronisation pour un système de communication multi-utilisateur DS/CDMA asynchrone est proposé dans cet article. L'algorithme est basé sur la technique de formation de faisceau MVDR (Minimum Variance Distortionless Response) qui minimise la puissance de sortie du formateur de faisceau avec la contrainte que seul le signal avec une synchronisation exacte est transmis sans distorsion. En exploitant les caractéristiques selon lesquelles la puissance de sortie du formateur de faisceau MVDR est gravement dégradée en raison d'une estimation de synchronisation erronée, nous développons un algorithme efficace pour estimer le timing de chaque utilisateur en analysant la variation de puissance de sortie du formateur de faisceau. Comparé au maximum a posteriori (MAP) ou estimateur de temps multi-utilisateur basé sur le maximum de vraisemblance (ML), la complexité est considérablement réduite en séparant le problème d'optimisation multidimensionnelle en plusieurs problèmes d'optimisation unidimensionnels. De plus, l'algorithme est plus réalisable sur le plan informatique que l'estimateur de temps basé sur le sous-espace puisqu'aucune composition propre (EVD) n'est requise. De plus, l’algorithme proposé est résistant à proximité puisque le formateur de faisceau MVDR est intrinsèquement indépendant de l’énergie des brouilleurs.
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Wei-Chiang WU, Jiang-Whai DAI, "Timing Estimation of CDMA Communication Based on MVDR Beamforming Technique" in IEICE TRANSACTIONS on Fundamentals,
vol. E83-A, no. 11, pp. 2147-2151, November 2000, doi: .
Abstract: A new timing estimation algorithm for asynchronous DS/CDMA multiuser communication system is proposed in this paper. The algorithm is based on the Minimum Variance Distortionless Response (MVDR) beamforming technique that minimizes the beamformer's output power with the constraint that only the signal with exact timing is distortionlessly passed. Exploiting the characteristics that the MVDR beamformer's output power is severely degraded according to erroneous timing estimation, we develop an efficient algorithm to estimate each user's timing by scanning the beamformer's output power variation. Compared to the maximum a posteriori (MAP) or maximum likelihood (ML) based multiuser timing estimator, the complexity is extensively reduced by separating the multi-dimensional optimization problem into several one-dimensional optimization problems. Furthermore, the algorithm is computationally feasible than the subspace-based timing estimator since no eigendecomposition (EVD) is required. Moreover, the proposed algorithm is near-far resistant since the MVDR beamformer is inherently energy independent to the interferers.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e83-a_11_2147/_p
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@ARTICLE{e83-a_11_2147,
author={Wei-Chiang WU, Jiang-Whai DAI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Timing Estimation of CDMA Communication Based on MVDR Beamforming Technique},
year={2000},
volume={E83-A},
number={11},
pages={2147-2151},
abstract={A new timing estimation algorithm for asynchronous DS/CDMA multiuser communication system is proposed in this paper. The algorithm is based on the Minimum Variance Distortionless Response (MVDR) beamforming technique that minimizes the beamformer's output power with the constraint that only the signal with exact timing is distortionlessly passed. Exploiting the characteristics that the MVDR beamformer's output power is severely degraded according to erroneous timing estimation, we develop an efficient algorithm to estimate each user's timing by scanning the beamformer's output power variation. Compared to the maximum a posteriori (MAP) or maximum likelihood (ML) based multiuser timing estimator, the complexity is extensively reduced by separating the multi-dimensional optimization problem into several one-dimensional optimization problems. Furthermore, the algorithm is computationally feasible than the subspace-based timing estimator since no eigendecomposition (EVD) is required. Moreover, the proposed algorithm is near-far resistant since the MVDR beamformer is inherently energy independent to the interferers.},
keywords={},
doi={},
ISSN={},
month={November},}
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TY - JOUR
TI - Timing Estimation of CDMA Communication Based on MVDR Beamforming Technique
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 2147
EP - 2151
AU - Wei-Chiang WU
AU - Jiang-Whai DAI
PY - 2000
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E83-A
IS - 11
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - November 2000
AB - A new timing estimation algorithm for asynchronous DS/CDMA multiuser communication system is proposed in this paper. The algorithm is based on the Minimum Variance Distortionless Response (MVDR) beamforming technique that minimizes the beamformer's output power with the constraint that only the signal with exact timing is distortionlessly passed. Exploiting the characteristics that the MVDR beamformer's output power is severely degraded according to erroneous timing estimation, we develop an efficient algorithm to estimate each user's timing by scanning the beamformer's output power variation. Compared to the maximum a posteriori (MAP) or maximum likelihood (ML) based multiuser timing estimator, the complexity is extensively reduced by separating the multi-dimensional optimization problem into several one-dimensional optimization problems. Furthermore, the algorithm is computationally feasible than the subspace-based timing estimator since no eigendecomposition (EVD) is required. Moreover, the proposed algorithm is near-far resistant since the MVDR beamformer is inherently energy independent to the interferers.
ER -