Expectation-maximization-based channel estimation algorithm for OFDM visible light communication systems

Citation

Alias, Mohamad Yusoff and Omar, Nazaruddin and Salleh, Mohd Kamarulzamin and Hussein, Yaseein Soubhi and Abdulkafi, Ayad Atiyah (2018) Expectation-maximization-based channel estimation algorithm for OFDM visible light communication systems. International Journal of Engineering and Technology(UAE), 7 (4). pp. 2638-2645. ISSN 2227-524X

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Abstract

The tremendous growth of indoor communication requires increased capacity and appropriate quality of services. Visible light communica-tion (VLC) is a green technology that shows great promise in terms of its ability to meet the demand for communication services. Orthogo-nal frequency division multiplexing (OFDM) enables VLC to provide a higher data rate and to combat inter-symbol interference. However, an accurate and efficient channel estimation method is needed for coherent demodulation at the receiver end of an OFDM system. In this paper, a new algorithm for OFDM-based VLC systems is proposed. The algorithm is based on expectation maximization and is called the expectation maximization for visible light communication (EM-VLC) algorithm. The algorithm is implemented to find the maximum-likelihood (ML) estimation of the channel impulse response and to find unknown parameters. In addition, a low-rank minimum mean square error (lr-MMSE) estimator algorithm is developed and its performance is compared with least squares (LS) and minimum mean square error (MMSE) estimators. The proposed EM-VLC algorithm improves the performance of OFDM VLC systems by significantly reducing the bit error rate (BER) and consequently increasing system throughput. The simulation results demonstrate that the EM-VLC algorithm outper-forms the three channel estimation algorithms, LS, MMSE and lr-MMSE.

Item Type: Article
Uncontrolled Keywords: Orthogonal frequency division multiplexing, Bit Error Rate, Channel Estimation, Expectation Maximization, Optical OFDM Visible Light Communication.
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 27 Jul 2021 01:47
Last Modified: 27 Jul 2021 01:47
URII: http://shdl.mmu.edu.my/id/eprint/7687

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