Zhilan Lu, Chao Shen, Jianyang Shi, Nan Chi, "Security enhanced underwater visible light communication system based on chaotic phase scrambling and conjugate frequency hopping," Chin. Opt. Lett. 21, 060602 (2023)

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- Chinese Optics Letters
- Vol. 21, Issue 6, 060602 (2023)

Fig. 1. The principle of the proposed scheme. The original bit sequence is mapped into the PAM-8 signal. After FFT, two major methods, logistic phase scrambling and conjugate frequency hopping, are implemented. After IFFT and UVLC transmission, the received signal is dehopped and descrambled for DSP and demodulation.

Fig. 2. Logistic maps generated by (a) Eq. (8 ) and (b) Eq. (9 ) when the bifurcation parameter μ changes.

Fig. 3. Experimental setup of the proposed scheme for UVLC links. Arbitrary waveform generator, AWG; electric amplifier, EA; positive-intrinsic-negative photoelectric diode; PIN-PD; oscilloscope, OSC.

Fig. 4. BER performance versus the bias current Ib and the peak-to-peak voltage Vpp of the AWG.

Fig. 5. BER versus the transmission speed. Insets are the constellation diagrams.

Fig. 6. BER versus the phase scrambling coding weight w. Insets are the constellation diagrams.

Fig. 7. BER versus the different decryption technology.

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