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
L'égalisation dans le domaine fréquentiel (FDE) basée sur le critère d'erreur quadratique moyenne minimale (MMSE) peut augmenter les performances du taux d'erreur binaire (BER) de liaison descendante du DS-CDMA au-delà de ce qui est possible avec une combinaison de rake conventionnelle dans un canal à évanouissement sélectif en fréquence. FDE nécessite une estimation précise du canal. Récemment, nous avons proposé une estimation de canal assistée par pilote (CE) basée sur le critère MMSE. Grâce au MMSE-CE, la précision de l'estimation du canal est presque insensible à la séquence des puces pilotes et une bonne performance BER est obtenue. Dans cet article, nous proposons un schéma d'estimation de canal utilisant l'algorithme des moindres carrés (RLS) récursif en un clic, où le facteur d'oubli est adapté à l'état changeant du canal par l'algorithme des moindres carrés moyens (LMS), pour DS-CDMA avec FDE. Nous évaluons les performances du BER en utilisant RLS-CE avec facteur d'oubli adaptatif dans un canal à évanouissement rapide de Rayleigh sélectif en fréquence par simulation informatique.
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Yohei KOJIMA, Hiromichi TOMEBA, Kazuaki TAKEDA, Fumiyuki ADACHI, "RLS Channel Estimation with Adaptive Forgetting Factor for DS-CDMA Frequency-Domain Equalization" in IEICE TRANSACTIONS on Communications,
vol. E92-B, no. 5, pp. 1457-1465, May 2009, doi: 10.1587/transcom.E92.B.1457.
Abstract: Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can increase the downlink bit error rate (BER) performance of DS-CDMA beyond that possible with conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. Recently, we proposed a pilot-assisted channel estimation (CE) based on the MMSE criterion. Using MMSE-CE, the channel estimation accuracy is almost insensitive to the pilot chip sequence, and a good BER performance is achieved. In this paper, we propose a channel estimation scheme using one-tap recursive least square (RLS) algorithm, where the forgetting factor is adapted to the changing channel condition by the least mean square (LMS) algorithm, for DS-CDMA with FDE. We evaluate the BER performance using RLS-CE with adaptive forgetting factor in a frequency-selective fast Rayleigh fading channel by computer simulation.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.1457/_p
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@ARTICLE{e92-b_5_1457,
author={Yohei KOJIMA, Hiromichi TOMEBA, Kazuaki TAKEDA, Fumiyuki ADACHI, },
journal={IEICE TRANSACTIONS on Communications},
title={RLS Channel Estimation with Adaptive Forgetting Factor for DS-CDMA Frequency-Domain Equalization},
year={2009},
volume={E92-B},
number={5},
pages={1457-1465},
abstract={Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can increase the downlink bit error rate (BER) performance of DS-CDMA beyond that possible with conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. Recently, we proposed a pilot-assisted channel estimation (CE) based on the MMSE criterion. Using MMSE-CE, the channel estimation accuracy is almost insensitive to the pilot chip sequence, and a good BER performance is achieved. In this paper, we propose a channel estimation scheme using one-tap recursive least square (RLS) algorithm, where the forgetting factor is adapted to the changing channel condition by the least mean square (LMS) algorithm, for DS-CDMA with FDE. We evaluate the BER performance using RLS-CE with adaptive forgetting factor in a frequency-selective fast Rayleigh fading channel by computer simulation.},
keywords={},
doi={10.1587/transcom.E92.B.1457},
ISSN={1745-1345},
month={May},}
Copier
TY - JOUR
TI - RLS Channel Estimation with Adaptive Forgetting Factor for DS-CDMA Frequency-Domain Equalization
T2 - IEICE TRANSACTIONS on Communications
SP - 1457
EP - 1465
AU - Yohei KOJIMA
AU - Hiromichi TOMEBA
AU - Kazuaki TAKEDA
AU - Fumiyuki ADACHI
PY - 2009
DO - 10.1587/transcom.E92.B.1457
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 5
JA - IEICE TRANSACTIONS on Communications
Y1 - May 2009
AB - Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can increase the downlink bit error rate (BER) performance of DS-CDMA beyond that possible with conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. Recently, we proposed a pilot-assisted channel estimation (CE) based on the MMSE criterion. Using MMSE-CE, the channel estimation accuracy is almost insensitive to the pilot chip sequence, and a good BER performance is achieved. In this paper, we propose a channel estimation scheme using one-tap recursive least square (RLS) algorithm, where the forgetting factor is adapted to the changing channel condition by the least mean square (LMS) algorithm, for DS-CDMA with FDE. We evaluate the BER performance using RLS-CE with adaptive forgetting factor in a frequency-selective fast Rayleigh fading channel by computer simulation.
ER -