Citation

Al-Aghbari, Khaled Abdulaziz (2019) Channel Estimation And Equalisation For Optical Filter Bank Multicarrier With Offset Quadrature Amplitude Modulation. PhD thesis, Multimedia University.

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Abstract

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.

Item Type:	Thesis (PhD)
Additional Information:	Call No.: TK5103.59 .K43 2019
Uncontrolled Keywords:	Optical communications
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television
Divisions:	Faculty of Engineering and Technology (FET)
Depositing User:	Ms Nurul Iqtiani Ahmad
Date Deposited:	22 Sep 2020 17:53
Last Modified:	22 Sep 2020 17:53
URII:	http://shdl.mmu.edu.my/id/eprint/7766

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