LI-FI based Peak to Average Power Ratio Reduction in HACO-OFDM System

Perarasi, T.; Vidhya, S.; Hemavikasini, S.; Vakula, V. S.; Varsha, H. S.

doi:10.1109/iccmc48092.2020.iccmc-00090

Cited by 2 publications

(2 citation statements)

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“…In this section, the strategies of OFDM techniques used in the LiFi system are briefly studied. With an equalizer at the receiver, OFDM techniques provide a high data rate and prevent inter-symbol interference (ISI), making OFDM more attractive for LiFi [23][24][25][26][27][28][29] technology. OFDM was widely applied in the context of wireless radio channels to combat ISI and to provide high data rates [30,31].…”

Section: Literature Review On Ofdm Formatsmentioning

confidence: 99%

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A Novel OFDM Format and a Machine Learning Based Dimming Control for LiFi

2021

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This paper proposes a new hybrid orthogonal frequency division multiplexing (OFDM) form termed as DC-biased pulse amplitude modulated optical OFDM (DPO-OFDM) by combining the ideas of the existing DC-biased optical OFDM (DCO-OFDM) and pulse amplitude modulated discrete multitone (PAM-DMT). The analysis indicates that the required DC-bias for DPO-OFDM-based light fidelity (LiFi) depends on the dimming level and the components of the DPO-OFDM. The bit error rate (BER) performance and dimming flexibility of the DPO-OFDM and existing OFDM schemes are evaluated using MATLAB tools. The results show that the proposed DPO-OFDM is power efficient and has a wide dimming range. Furthermore, a switching algorithm is introduced for LiFi, where the individual components of the hybrid OFDM are switched according to a target dimming level. Next, machine learning algorithms are used for the first time to find the appropriate proportions of the hybrid OFDM components. It is shown that polynomial regression of degree 4 can reliably predict the constellation size of the DCO-OFDM component of DPO-OFDM for a given constellation size of PAM-DMT. With the component switching and the machine learning algorithms, DPO-OFDM-based LiFi is power efficient at a wide dimming range.

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Section: Literature Review On Ofdm Formatsmentioning

confidence: 99%

“…There is a slight degradation in signal-to-noise ratio (SNR), but there is an improvement in the peak to average power ratio (PAPR). The efficiency of the HACO system is improved in [29], where PAPR is reduced compared to ACO. This system results in a low BER of 10 −7 .…”

Section: Literature Review On Ofdm Formatsmentioning

confidence: 99%