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Performance analysis of DFT-S-OFDM waveform for Li-Fi systems

Saleh Hussin Eslam M. Shalaby
Opto-Electronics Review | 2021 | 29 | 4 | 167-174 | DOI: 10.24425/opelre.2021.139753
Keywords light-fidelity visible light communications orthogonal frequency division multiplexing discrete Fourier transform spread peak-to-average power ratio
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Abstract

In this paper, the effect of an indoor visible light communication channel is studied. Moreover, the analysis of the received power distribution of the photodiode in the line of sight and the first reflection of the channel without line of sight with several parameters is simulated. Two different waveforms are explained in detail. Orthogonal frequency division multiplexing has been widely adopted in radio frequency and optical communication systems. One of the most important disadvantages of the orthogonal frequency division multiplexing signal is the high peak-to-average power ratio. Therefore, it is important to minimize the peak-to-average power ratio in the visible light communication systems more than in radio-frequency wireless applications. In the visible light communication systems, the high peak-to-average power ratio produces a high DC bias which reduces power efficiency of the system. A discrete Fourier transform spread orthogonal frequency division multiplexing is proposed to be used in wireless communication systems; its ability to minimize peak-to-average power ratio has been tested. The analysis of two different subcarrier allocation methods for the discrete Fourier transform-spread subcarriers, as well as the examination of two distinct subcarrier allocation strategies, distributed and localized mapping, are investigated and studied. The effects of an accurate new sub-band mapping for the localized discrete Fourier transform spread orthogonal frequency division multiplexing scheme are presented in this paper. The light-fidelity system performance of the orthogonal frequency division multiplexing and discrete Fourier transform spread orthogonal frequency division multiplexing with different sub-mapping techniques are simulated with Matlab™. A system performance size of bit error rate and peak-to-average power ratio are obtained, as well.
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Authors and Affiliations

Saleh Hussin
1
Eslam M. Shalaby
2
  1. Electronics and Communication Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, 44519 Egypt
  2. Electronics and Communication Engineering Department, Higher Technological institute, 10th of Ramadan City, Megawra 1, 44629 Egyp

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