Abstract
LED based visible light communication (VLC) has become a feasible technology for indoor high-speed access networks. Optical orthogonal frequency division multiplexing (O-OFDM) with high spectrum efficiency is often used to increase the data rate to overcome the limited bandwidth of LEDs. Due to the LED nonlinearity and high peak-to-average-power ratio (PAPR) of OFDM, the indoor broadcasting OFDM-VLC system suffers from not only the performance deterioration, but also the security issue. In this paper, we propose to use digital chaotic sequence pilot-assisted (CSPA) scheme to jointly improve the signal-to-noise-ratio (SNR) performance and the system security. The experimental results indicate that the proposed method can achieve 3 dB PAPR mitigation even up for OFDM 64-QAM signal and 2 dB SNR improvement. Meanwhile, the proposed digital CS offers a key space of ∼10 106 for each OFDM symbol to guarantee the secure transmission.
| Original language | English |
|---|---|
| Pages (from-to) | 21-26 |
| Number of pages | 6 |
| Journal | Optics Communications |
| Volume | 439 |
| DOIs | |
| Publication status | Published - 15 May 2019 |
Funding
This work was supported by Anhui Provincial Natural Science Foundation, China (Grant No. 1808085MF186 ).
Keywords
- Digital chaotic sequence pilot-assisted scheme
- Orthogonal frequency division multiplexing
- Peak-to-average power ratio
- Visible light communication
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