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Machine learning based dimming control of orthogonal frequency division multiplexing based light fidelity

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dc.contributor.advisor Mondal, 1Dr. Md. Rubaiyat Hossain
dc.contributor.author Nowrin, Itisha
dc.date.accessioned 2022-06-28T04:38:47Z
dc.date.available 2022-06-28T04:38:47Z
dc.date.issued 2021-03-13
dc.identifier.uri http://lib.buet.ac.bd:8080/xmlui/handle/123456789/6034
dc.description.abstract This thesis proposes a new hybrid orthogonal frequency division multiplexing (OFDM) modulation technique termed as DC-biased Pulse amplitude modulated Optical OFDM (DPO-OFDM) for light fidelity (LiFi) systems. The proposed DPO-OFDM scheme is the combination of two existing OFDM formats: DC-biased Optical OFDM (DCO-OFDM) and Pulse Amplitude Modulated discrete multitone (PAM-DMT). In DPO-OFDM, the odd index subcarriers carry DCO-OFDM, and the imaginary part of even index subcarriers carry PAM-DMT component. Analysis indicates that the required DC-bias for DPO-OFDM is a function of the dimming and root mean square of its two components' values. Simulation results show that for an uncoded bit error rate (BER) of 10-3, the dimming range for DPO-OFDM is 3% to 97% with acceptable spectral efficiency. Furthermore, a switching algorithm for HDAP-OFDM is proposed where the individual components of HDAP-OFDM are switched according to a target dimming level. Next, machine learning algorithms are used to find the appropriate proportions of DPO-OFDM components. For this, a dataset is created for DPO-OFDM system simulated using the MATLAB tool. Using Python programming language, it is shown here that polynomial regression of degree 4 can reliable predict the constellation size of DCO-OFDM component of DPO-OFDM for a given constellation size of PAM-DMT and a given target dimming level. Hence, the findings of this thesis can contribute in developing a practical LiFi system capable of reliable Internet connection and room illumination. en_US
dc.language.iso en en_US
dc.publisher Institute of Information and Commutation Technology en_US
dc.subject Wireless communication systems-OFDM en_US
dc.title Machine learning based dimming control of orthogonal frequency division multiplexing based light fidelity en_US
dc.type Thesis-MSc en_US
dc.contributor.id 0417312034, en_US
dc.identifier.accessionNumber 118600
dc.contributor.callno 623.82/ITI/2021 en_US


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