Chaotic Code Division Multiple Access Visible Light Communication System Based on AES Encrypted Interleaving

Abstract

The invention discloses a chaos code division multiple access visible light communication system based on AES encrypted interweaving. At a sending end, data sent by a user i is modulated and multiplied by a chaos sequence i generated by a chaos sequence generator for spreading spectrum, and then interweaved by an interweaving method based on an AES encryption algorithm to generate encrypted information; the interweaved data passes through a visible light channel; at a receiving end, a user de-interleaves the data through a de-interleaving method based on the AES encryption algorithm, then de-spreads spectrum by using the corresponding chaos sequence i, and at last demodulates the data to obtain the original data sent by the user; ambipolar transmission signals are converted into nonnegative signals by adding DC bias before the transmission signals enter the visible light channel. According to the chaos code division multiple access visible light communication system based on AES encrypted interweaving, the advantage that the key of the AES encryption algorithm is difficult to break is combined with the characteristic that the chaos sequence has noise-like property and sensitivity to initial conditions, so that the safety performance of the communication system is further enhanced, and secure access of multiple users to the visible light communication system is achieved.

Description

technical field [0001] The invention relates to the field of visible light communication, and proposes a highly secure chaotic code division multiple access visible light communication system based on AES (Advanced Encryption Standard, Advanced Encryption Standard) encryption and interleaving. Background technique [0002] Visible light communication (Visible Light Communication, VLC) technology combines communication with indoor lighting, using light emitting diodes (Light Emitting Diodes, LEDs) as the light source at the transmitting end, after light intensity modulation, passing through a light intensity detector (Photodiode, PD) at the receiving end ) direct detection (Intensity Modulation with DirectDetection, IM / DD) receiving information. At present, the transmission mode used in wireless communication systems is mainly radio frequency communication. Compared with radio frequency communication technology, visible light communication technology has the advantages of no ...

AI Technical Summary

Problems solved by technology

However, the chaotic sequence generator is easy to implement, and the CDMA scheme based on chaotic sequence has poor ability to resist attacks. Malicious users can even estimate the parameters and initial values ​​of the chaotic sequence generator without prior information. , so as to obtain the user's sending information, so the security of the system cannot be guaranteed

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