Channel Estimation And Equalisation For Optical Filter Bank Multicarrier With Offset Quadrature Amplitude Modulation

Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) is an emerging waveform for next generation optical communications, which applies filter banks to the multicarrier signal and eliminates the need for cyclic prefix (CP) used in the popular orthogonal frequency division...

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Main Author:	Al-Aghbari, Khaled Abdulaziz
Format:	Thesis
Published:	2019
Subjects:	TK5101-6720 Telecommunication Including telegraphy, telephone, radio, radar, television
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id	my-mmu-ep.7766
record_format	uketd_dc
spelling	my-mmu-ep.77662020-09-22T17:53:20Z Channel Estimation And Equalisation For Optical Filter Bank Multicarrier With Offset Quadrature Amplitude Modulation 2019-07 Al-Aghbari, Khaled Abdulaziz TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) is an emerging waveform for next generation optical communications, which applies filter banks to the multicarrier signal and eliminates the need for cyclic prefix (CP) used in the popular orthogonal frequency division multiplexing (OFDM) system. Unlike OFDM, FBMC subcarriers are only orthogonal in the real field, whereas the orthogonality in the imaginary field is lost. This causes what is known as intrinsic interference, which seriously deteriorates system performance. The problem is worsened by the presence of complex distortion of the optical channel. Therefore, accurate channel estimation and equalisation are needed for eliminating the effects of both the intrinsic interference and optical channel distortion. Conventional channel estimation and equalisation techniques, which can be practically implemented in optical OFDM, become a challenge in optical FBMC/OQAM. In this thesis, new robust channel estimation and equalisation techniques for a coherent optical FBMC/OQAM system are proposed. First, the performance of the channel estimator is investigated using interference approximation method (IAM), which is commonly used to combat inherent intrinsic interference in the FBMC/OQAM system. It is found that residual intrinsic interference still exists in the system and has significant impact to the performance of the least square (LS) channel estimator. A robust technique based on the discrete Fourier transform (DFT) technique and new adaptive optimum channel energy criterion is then proposed to suppress the residual intrinsic interference and channel noise effects from the estimated optical channel impulse response. Simulation results show that the proposed channel estimator is capable of estimating the channel that suffers from attenuation and chromatic dispersion, and suppressing the residual intrinsic interference and channel noise more effectively than the conventional LS-based channel estimator. The proposed approach offers a better trade-off between complexity and performance. 2019-07 Thesis http://shdl.mmu.edu.my/7766/ http://library.mmu.edu.my/library2/diglib/mmuetd/ phd doctoral Multimedia University Faculty of Engineering & Technology
institution	Multimedia University
collection	MMU Institutional Repository
topic	TK5101-6720 Telecommunication Including telegraphy, telephone, radio, radar, television
spellingShingle	TK5101-6720 Telecommunication Including telegraphy, telephone, radio, radar, television Al-Aghbari, Khaled Abdulaziz Channel Estimation And Equalisation For Optical Filter Bank Multicarrier With Offset Quadrature Amplitude Modulation
description	Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) is an emerging waveform for next generation optical communications, which applies filter banks to the multicarrier signal and eliminates the need for cyclic prefix (CP) used in the popular orthogonal frequency division multiplexing (OFDM) system. Unlike OFDM, FBMC subcarriers are only orthogonal in the real field, whereas the orthogonality in the imaginary field is lost. This causes what is known as intrinsic interference, which seriously deteriorates system performance. The problem is worsened by the presence of complex distortion of the optical channel. Therefore, accurate channel estimation and equalisation are needed for eliminating the effects of both the intrinsic interference and optical channel distortion. Conventional channel estimation and equalisation techniques, which can be practically implemented in optical OFDM, become a challenge in optical FBMC/OQAM. In this thesis, new robust channel estimation and equalisation techniques for a coherent optical FBMC/OQAM system are proposed. First, the performance of the channel estimator is investigated using interference approximation method (IAM), which is commonly used to combat inherent intrinsic interference in the FBMC/OQAM system. It is found that residual intrinsic interference still exists in the system and has significant impact to the performance of the least square (LS) channel estimator. A robust technique based on the discrete Fourier transform (DFT) technique and new adaptive optimum channel energy criterion is then proposed to suppress the residual intrinsic interference and channel noise effects from the estimated optical channel impulse response. Simulation results show that the proposed channel estimator is capable of estimating the channel that suffers from attenuation and chromatic dispersion, and suppressing the residual intrinsic interference and channel noise more effectively than the conventional LS-based channel estimator. The proposed approach offers a better trade-off between complexity and performance.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Al-Aghbari, Khaled Abdulaziz
author_facet	Al-Aghbari, Khaled Abdulaziz
author_sort	Al-Aghbari, Khaled Abdulaziz
title	Channel Estimation And Equalisation For Optical Filter Bank Multicarrier With Offset Quadrature Amplitude Modulation
title_short	Channel Estimation And Equalisation For Optical Filter Bank Multicarrier With Offset Quadrature Amplitude Modulation
title_full	Channel Estimation And Equalisation For Optical Filter Bank Multicarrier With Offset Quadrature Amplitude Modulation
title_fullStr	Channel Estimation And Equalisation For Optical Filter Bank Multicarrier With Offset Quadrature Amplitude Modulation
title_full_unstemmed	Channel Estimation And Equalisation For Optical Filter Bank Multicarrier With Offset Quadrature Amplitude Modulation
title_sort	channel estimation and equalisation for optical filter bank multicarrier with offset quadrature amplitude modulation
granting_institution	Multimedia University
granting_department	Faculty of Engineering & Technology
publishDate	2019
_version_	1747829677473398784

Channel Estimation And Equalisation For Optical Filter Bank Multicarrier With Offset Quadrature Amplitude Modulation

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