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
Les canaux de communication mobile subissent toujours de graves évanouissements sélectifs en fréquence en raison de l'effet de trajets multiples. Les codes d'étalement traditionnels se caractérisent par le fait que leur orthogonalité dans le domaine temporel est basée sur une largeur de fragment fixe sur une période de code. Ils ne parviennent souvent pas à bien fonctionner en cas d'évanouissement sélectif en fréquence. Cet article propose une nouvelle classe de codes CDMA, des codes orthogonaux de paquets d'ondelettes capables de conserver l'orthogonalité du domaine temporel ainsi que d'offrir une diversité de sous-bandes intra-code pour atténuer l'évanouissement sélectif en fréquence. Les nouveaux codes sont construits en rassemblant plusieurs ondelettes présentant diverses dilatations et déplacements. La combinaison des ondelettes dans différents nœuds dans un arbre binaire complet de paquets d'ondelettes permet une capacité de diversité de fréquence. Grâce à la longueur régulière du code, ils peuvent être facilement utilisés dans les communications mobiles pour le streaming multi-débit et la diffusion multi-code. L'étude des performances est réalisée à l'aide d'un algorithme de convolution de distribution de statistiques de corrélation et les résultats révèlent que les codes de paquets d'ondelettes, combinés au récepteur RAKE, fonctionnent mieux que les codes d'étalement traditionnels dans les canaux à évanouissement sélectifs en fréquence.
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Hsiao-Hwa CHEN, "Multi-Band Wavelet-Packet Spreading Codes with Intra-Code Subband Diversity for Communications in Multipath Fading Channels" in IEICE TRANSACTIONS on Communications,
vol. E84-B, no. 7, pp. 1876-1884, July 2001, doi: .
Abstract: Mobile communication channels always suffer serious frequency-selective fading due to multipath effect. Traditional spreading codes are characterized by the fact that their time-domain orthogonality is based on fixed chip width across a code period. They often fail to perform well under frequency-selective fading. This paper proposes a new class of CDMA codes, wavelet-packet orthogonal codes capable to retain time-domain orthogonality as well as to offer intra-code subband diversity to mitigate frequency-selective fading. The new codes are constructed by congregating several wavelets with various dilations and shifts. The combination of the wavelets in different nodes in a wavelet-packet full binary tree enables frequency diversity capability. Owing to the even code length, they can be easily used in mobile communications for multi-rate streaming and multi-code spreading. The performance study is carried out using correlation statistics distribution convolution algorithm and the results reveal that wavelet-packet codes, combined with RAKE receiver, perform better than traditional spreading codes in frequency-selective fading channels.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e84-b_7_1876/_p
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@ARTICLE{e84-b_7_1876,
author={Hsiao-Hwa CHEN, },
journal={IEICE TRANSACTIONS on Communications},
title={Multi-Band Wavelet-Packet Spreading Codes with Intra-Code Subband Diversity for Communications in Multipath Fading Channels},
year={2001},
volume={E84-B},
number={7},
pages={1876-1884},
abstract={Mobile communication channels always suffer serious frequency-selective fading due to multipath effect. Traditional spreading codes are characterized by the fact that their time-domain orthogonality is based on fixed chip width across a code period. They often fail to perform well under frequency-selective fading. This paper proposes a new class of CDMA codes, wavelet-packet orthogonal codes capable to retain time-domain orthogonality as well as to offer intra-code subband diversity to mitigate frequency-selective fading. The new codes are constructed by congregating several wavelets with various dilations and shifts. The combination of the wavelets in different nodes in a wavelet-packet full binary tree enables frequency diversity capability. Owing to the even code length, they can be easily used in mobile communications for multi-rate streaming and multi-code spreading. The performance study is carried out using correlation statistics distribution convolution algorithm and the results reveal that wavelet-packet codes, combined with RAKE receiver, perform better than traditional spreading codes in frequency-selective fading channels.},
keywords={},
doi={},
ISSN={},
month={July},}
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TY - JOUR
TI - Multi-Band Wavelet-Packet Spreading Codes with Intra-Code Subband Diversity for Communications in Multipath Fading Channels
T2 - IEICE TRANSACTIONS on Communications
SP - 1876
EP - 1884
AU - Hsiao-Hwa CHEN
PY - 2001
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E84-B
IS - 7
JA - IEICE TRANSACTIONS on Communications
Y1 - July 2001
AB - Mobile communication channels always suffer serious frequency-selective fading due to multipath effect. Traditional spreading codes are characterized by the fact that their time-domain orthogonality is based on fixed chip width across a code period. They often fail to perform well under frequency-selective fading. This paper proposes a new class of CDMA codes, wavelet-packet orthogonal codes capable to retain time-domain orthogonality as well as to offer intra-code subband diversity to mitigate frequency-selective fading. The new codes are constructed by congregating several wavelets with various dilations and shifts. The combination of the wavelets in different nodes in a wavelet-packet full binary tree enables frequency diversity capability. Owing to the even code length, they can be easily used in mobile communications for multi-rate streaming and multi-code spreading. The performance study is carried out using correlation statistics distribution convolution algorithm and the results reveal that wavelet-packet codes, combined with RAKE receiver, perform better than traditional spreading codes in frequency-selective fading channels.
ER -