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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).

- Publication
- IEICE TRANSACTIONS on Communications Vol.E101-B No.11 pp.2320-2330

- Publication Date
- 2018/11/01

- Publicized
- 2018/04/27

- Online ISSN
- 1745-1345

- DOI
- 10.1587/transcom.2017EBP3473

- Type of Manuscript
- PAPER

- Category
- Wireless Communication Technologies

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

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.

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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

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@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},}

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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 -