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Journal of Electrical and Computer Engineering
Volume 2016, Article ID 2326563, 7 pages
Research Article

A Chaos-Based Encryption Scheme for DCT Precoded OFDM-Based Visible Light Communication Systems

1School of Information and Electronic Engineering, Zhejiang University of Science and Technology, Hang Zhou 310023, China
2State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China

Received 30 April 2016; Revised 26 June 2016; Accepted 19 July 2016

Academic Editor: Maher Jridi

Copyright © 2016 Zhongpeng Wang and Shoufa Chen. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper proposes a physical encryption scheme for discrete cosine transform (DCT) precoded OFDM-based visible light communication systems by employing chaos scrambling. In the proposed encryption scheme, the Logistic map is adopted for the chaos mapping. The chaos scrambling strategy can allocate the two scrambling sequences to the real () and imaginary () parts of OFDM frames according to the initial condition, which enhance the confidentiality of the physical layer. The simulation experimental results prove the efficiency of the proposed encryption method for DCT precoded OFDM-based VLC systems. The experimental results show that the proposed security scheme can protect the DCT precoded OFDM-based VLC from eavesdropper, while keeping the advantage of the DCT precoding technique, which can reduce the PAPR and improve the BER performance of OFDM-based VLC.