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
L'égalisation dans le domaine fréquentiel (FDE) basée sur le critère d'erreur quadratique moyenne minimale (MMSE) peut fournir de meilleures performances de taux d'erreur binaire (BER) en liaison descendante pour l'accès multiple par répartition en code en séquence directe (DS-CDMA) que la combinaison râteau conventionnelle dans un système de fréquence- canal d'évanouissement sélectif. FDE nécessite une estimation précise du canal. Dans cet article, nous proposons une nouvelle estimation de canal à maximum de vraisemblance (MLCE) en 2 étapes pour DS-CDMA avec FDE dans un environnement d'évanouissement sélectif en fréquence très lent. La 1ère étape utilise le MMSE-CE conventionnel assisté par pilote et la 2ème étape réalise le MLCE en utilisant le retour de décision de la 1ère étape. L'amélioration des performances BER obtenue par le MLCE en 2 étapes par rapport au MMSE-CE assisté par pilote est confirmée par simulation informatique.
The copyright of the original papers published on this site belongs to IEICE. Unauthorized use of the original or translated papers is prohibited. See IEICE Provisions on Copyright for details.
Copier
Yohei KOJIMA, Kazuaki TAKEDA, Fumiyuki ADACHI, "2-Step Maximum Likelihood Channel Estimation for Multicode DS-CDMA with Frequency-Domain Equalization" in IEICE TRANSACTIONS on Communications,
vol. E92-B, no. 6, pp. 2065-2071, June 2009, doi: 10.1587/transcom.E92.B.2065.
Abstract: Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide better downlink bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) than the conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. In this paper, we propose a new 2-step maximum likelihood channel estimation (MLCE) for DS-CDMA with FDE in a very slow frequency-selective fading environment. The 1st step uses the conventional pilot-assisted MMSE-CE and the 2nd step carries out the MLCE using decision feedback from the 1st step. The BER performance improvement achieved by 2-step MLCE over pilot assisted MMSE-CE is confirmed by computer simulation.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.2065/_p
Copier
@ARTICLE{e92-b_6_2065,
author={Yohei KOJIMA, Kazuaki TAKEDA, Fumiyuki ADACHI, },
journal={IEICE TRANSACTIONS on Communications},
title={2-Step Maximum Likelihood Channel Estimation for Multicode DS-CDMA with Frequency-Domain Equalization},
year={2009},
volume={E92-B},
number={6},
pages={2065-2071},
abstract={Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide better downlink bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) than the conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. In this paper, we propose a new 2-step maximum likelihood channel estimation (MLCE) for DS-CDMA with FDE in a very slow frequency-selective fading environment. The 1st step uses the conventional pilot-assisted MMSE-CE and the 2nd step carries out the MLCE using decision feedback from the 1st step. The BER performance improvement achieved by 2-step MLCE over pilot assisted MMSE-CE is confirmed by computer simulation.},
keywords={},
doi={10.1587/transcom.E92.B.2065},
ISSN={1745-1345},
month={June},}
Copier
TY - JOUR
TI - 2-Step Maximum Likelihood Channel Estimation for Multicode DS-CDMA with Frequency-Domain Equalization
T2 - IEICE TRANSACTIONS on Communications
SP - 2065
EP - 2071
AU - Yohei KOJIMA
AU - Kazuaki TAKEDA
AU - Fumiyuki ADACHI
PY - 2009
DO - 10.1587/transcom.E92.B.2065
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 6
JA - IEICE TRANSACTIONS on Communications
Y1 - June 2009
AB - Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide better downlink bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) than the conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. In this paper, we propose a new 2-step maximum likelihood channel estimation (MLCE) for DS-CDMA with FDE in a very slow frequency-selective fading environment. The 1st step uses the conventional pilot-assisted MMSE-CE and the 2nd step carries out the MLCE using decision feedback from the 1st step. The BER performance improvement achieved by 2-step MLCE over pilot assisted MMSE-CE is confirmed by computer simulation.
ER -