Abstract
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 (I) and imaginary (Q) 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.
Highlights
Visible light communication (VLC) using light emitting diodes (LEDs), where the LEDs are used for both illumination and data wireless transmission, has received increasing attention among the researchers worldwide [1, 2]
Due to the greater immunity to multipath fading and reducing the complexity of equalizer, orthogonal frequency division multiplexing (OFDM) is one of the most popular techniques for high data rate communication. It has been accepted in the IEEE802.11a local area network (LAN), IEEE802.16 WiMax, digital audio broadcasting (DAB), and digital video broadcasting (DVB) and generation mobile technologies 3GPP LTE [4]
We will evaluate the effect of scrambling sequence on the peak-to-average power ratio (PAPR) and bit error rate (BER) performances of discrete cosine transform (DCT) precoded OFDMVLC over multipath optical wireless channel by simulation
Summary
Visible light communication (VLC) using light emitting diodes (LEDs), where the LEDs are used for both illumination and data wireless transmission, has received increasing attention among the researchers worldwide [1, 2]. Due to the greater immunity to multipath fading and reducing the complexity of equalizer, orthogonal frequency division multiplexing (OFDM) is one of the most popular techniques for high data rate communication It has been accepted in the IEEE802.11a local area network (LAN), IEEE802.16 WiMax, digital audio broadcasting (DAB), and digital video broadcasting (DVB) and generation mobile technologies 3GPP LTE [4]. Some physical secure strategies have been proposed in wireless communication and optical OFDM communication systems for fiber link [8,9,10,11,12] Among these proposed schemes, chaos mapping techniques have usually been employed to enhance the security of physical layer. We firstly propose a novel secure DCT precoded OFDM-based VLC using chaos scrambling technique.
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