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
Lorsque l'on tente d'estimer des canaux multitrajets variables dans le temps en appliquant un modèle d'expansion de base (BEM) dans les systèmes de multiplexage par répartition orthogonale de la fréquence (OFDM), les clusters pilotes sont contaminés par les interférences inter-porteuses (ICI). Le cluster pilote ICI (PC-ICI) dégrade la précision de l'estimation des coefficients BEM, ce qui dégrade les performances du système. Dans cet article, un schéma de suppression PC-ICI est proposé, dans lequel deux symboles codés définis comme des sommes pondérées de symboles de données sont insérés des deux côtés de chaque cluster pilote. En supposant que le canal possède un spectre Doppler plat, les coefficients de pondération optimisés sont obtenus par un algorithme d'optimisation itératif alternatif, de sorte que la somme du PC-ICI généré par les symboles codés et les symboles de données soit minimisée. En approchant les coefficients de poids optimisés, ils sont indépendants de la puissance de prise du canal. De plus, il est vérifié que le schéma proposé est robuste à l'erreur d'estimation du décalage de fréquence Doppler normalisé et peut être appliqué à des canaux avec d'autres types de spectres Doppler. Les résultats de simulation numérique montrent que, par rapport aux schémas conventionnels, le schéma proposé permet d'obtenir des améliorations significatives en termes de performances de suppression PC-ICI, d'estimation de canal et de taux d'erreur binaire (BER) du système.
Yong DING
Xidian University,Guilin University of Electronic Technology
Shan OUYANG
Xidian University,Guilin University of Electronic Technology
Yue-Lei XIE
Guilin University of Electronic Technology
Xiao-Mao CHEN
Guilin University of Electronic Technology
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Yong DING, Shan OUYANG, Yue-Lei XIE, Xiao-Mao CHEN, "Pilot Cluster ICI Suppression in OFDM Systems Based on Coded Symbols" in IEICE TRANSACTIONS on Communications,
vol. E101-B, no. 11, pp. 2320-2330, November 2018, doi: 10.1587/transcom.2017EBP3473.
Abstract: When trying to estimate time-varying multipath channels by applying a basis expansion model (BEM) in orthogonal frequency division multiplexing (OFDM) systems, pilot clusters are contaminated by inter-carrier interference (ICI). The pilot cluster ICI (PC-ICI) degrades the estimation accuracy of BEM coefficients, which degrades system performance. In this paper, a PC-ICI suppression scheme is proposed, in which two coded symbols defined as weighted sums of data symbols are inserted on both sides of each pilot cluster. Under the assumption that the channel has Flat Doppler spectrum, the optimized weight coefficients are obtained by an alternating iterative optimization algorithm, so that the sum of the PC-ICI generated by the encoded symbols and the data symbols is minimized. By approximating the optimized weight coefficients, they are independent of the channel tap power. Furthermore, it is verified that the proposed scheme is robust to the estimation error of the normalized Doppler frequency offset and can be applied to channels with other types of Doppler spectra. Numerical simulation results show that, compared with the conventional schemes, the proposed scheme achieves significant improvements in the performance of PC-ICI suppression, channel estimation and system bit-error-ratio (BER).
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2017EBP3473/_p
Copier
@ARTICLE{e101-b_11_2320,
author={Yong DING, Shan OUYANG, Yue-Lei XIE, Xiao-Mao CHEN, },
journal={IEICE TRANSACTIONS on Communications},
title={Pilot Cluster ICI Suppression in OFDM Systems Based on Coded Symbols},
year={2018},
volume={E101-B},
number={11},
pages={2320-2330},
abstract={When trying to estimate time-varying multipath channels by applying a basis expansion model (BEM) in orthogonal frequency division multiplexing (OFDM) systems, pilot clusters are contaminated by inter-carrier interference (ICI). The pilot cluster ICI (PC-ICI) degrades the estimation accuracy of BEM coefficients, which degrades system performance. In this paper, a PC-ICI suppression scheme is proposed, in which two coded symbols defined as weighted sums of data symbols are inserted on both sides of each pilot cluster. Under the assumption that the channel has Flat Doppler spectrum, the optimized weight coefficients are obtained by an alternating iterative optimization algorithm, so that the sum of the PC-ICI generated by the encoded symbols and the data symbols is minimized. By approximating the optimized weight coefficients, they are independent of the channel tap power. Furthermore, it is verified that the proposed scheme is robust to the estimation error of the normalized Doppler frequency offset and can be applied to channels with other types of Doppler spectra. Numerical simulation results show that, compared with the conventional schemes, the proposed scheme achieves significant improvements in the performance of PC-ICI suppression, channel estimation and system bit-error-ratio (BER).},
keywords={},
doi={10.1587/transcom.2017EBP3473},
ISSN={1745-1345},
month={November},}
Copier
TY - JOUR
TI - Pilot Cluster ICI Suppression in OFDM Systems Based on Coded Symbols
T2 - IEICE TRANSACTIONS on Communications
SP - 2320
EP - 2330
AU - Yong DING
AU - Shan OUYANG
AU - Yue-Lei XIE
AU - Xiao-Mao CHEN
PY - 2018
DO - 10.1587/transcom.2017EBP3473
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E101-B
IS - 11
JA - IEICE TRANSACTIONS on Communications
Y1 - November 2018
AB - When trying to estimate time-varying multipath channels by applying a basis expansion model (BEM) in orthogonal frequency division multiplexing (OFDM) systems, pilot clusters are contaminated by inter-carrier interference (ICI). The pilot cluster ICI (PC-ICI) degrades the estimation accuracy of BEM coefficients, which degrades system performance. In this paper, a PC-ICI suppression scheme is proposed, in which two coded symbols defined as weighted sums of data symbols are inserted on both sides of each pilot cluster. Under the assumption that the channel has Flat Doppler spectrum, the optimized weight coefficients are obtained by an alternating iterative optimization algorithm, so that the sum of the PC-ICI generated by the encoded symbols and the data symbols is minimized. By approximating the optimized weight coefficients, they are independent of the channel tap power. Furthermore, it is verified that the proposed scheme is robust to the estimation error of the normalized Doppler frequency offset and can be applied to channels with other types of Doppler spectra. Numerical simulation results show that, compared with the conventional schemes, the proposed scheme achieves significant improvements in the performance of PC-ICI suppression, channel estimation and system bit-error-ratio (BER).
ER -