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Visible Light Communication: An Investigation of LED Non-Linearity Effects on VLC Utilising C-OFDM
| Content Provider | MDPI |
|---|---|
| Author | Abdulwali, Jummah Boussakta, Said |
| Copyright Year | 2022 |
| Description | The electro-optic output of light-emitting diodes commonly used in visible light communication systems is generally nonlinear in nature. It is particularly problematic when using advanced modulation formats, such as orthogonal frequency-division multiplexing (OFDM), which have a high peak-to-average power ratio due to clipping and distortion. In this work, we introduce the so-called C-transform to the system architecture, which utilises a Walsh–Hadamard matrix in conjunction with a discrete cosine transform to deterministically spread the information and reduce the peak-to-average power ratio (PAPR). Several bias points along the electro-optic transfer function were selected for comparison purposes, and the new transform was compared with more traditional formulations of OFDM. This paper determines that the C-transform-based OFDM demonstrated the highest degree of independence from the non-linearity and yielded superior bit-error rate (BER) results. We note an improvement of ~2.5 dB in the power penalty at a BER of $10^{−4}$ in comparison to OFDM. |
| Starting Page | 192 |
| e-ISSN | 23046732 |
| DOI | 10.3390/photonics9030192 |
| Journal | Photonics |
| Issue Number | 3 |
| Volume Number | 9 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-03-17 |
| Access Restriction | Open |
| Subject Keyword | Photonics Telecommunications Bias Point Non-linearity Orthogonal Frequency Division Multiplexing (ofdm) Peak-to-average Power Ratio (papr) Visible Light Communication (vlc) |
| Content Type | Text |
| Resource Type | Article |
