A method for realizing high spectral efficiency and secure transmission

By sharing the initial value of the chaotic sequence in the OTFS system and designing a secure mapping method, the chaotic sequence is used to generate distinguishable signal constellation patterns and randomly shifted Gray mappings. This solves the physical layer security and spectrum efficiency issues of the OTFS system in high-speed mobile communications, and achieves high-security and high-spectrum-efficiency information transmission.

CN118381594BActive Publication Date: 2025-09-19NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Application Number
CN202410203453.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-02-23
Publication Date
2025-09-19
Estimated Expiration
2044-02-23

AI Technical Summary

Technical Problem

The existing OTFS system lacks research on using index dimensions to achieve physical layer security in high-speed mobile communication scenarios, and IM modulation fails to fully utilize spectrum efficiency.

Method used

The initial value of the chaotic sequence is shared at the legitimate transceiver, and the same chaotic mapping method is used to design a secure mapping method between information bits, constellation pattern indexes, and modulation symbols. The sensitivity and non-periodicity of the chaotic sequence are utilized to generate a distinguishable signal constellation pattern and a randomly shifted Gray mapping table through the chaotic sequence to achieve secure transmission of information bits.

Benefits of technology

The OTFS system achieves high security and high spectrum efficiency. Illegal eavesdroppers cannot decode legitimate signals, and the spectrum efficiency is better than traditional IM modulation.

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Abstract

This invention discloses a method for achieving highly spectrally efficient secure transmission. First, legitimate transceivers share chaotic sequence initial values ​​and employ the same chaotic mapping method, thereby sharing a set of chaotic sequences. Secondly, a secure mapping method is designed based on the chaotic sequences, linking information bits with constellation pattern indices and modulation symbols. Because an unauthorized eavesdropper cannot obtain the chaotic sequence initial values, and because the chaotic mapping method is sensitive to these initial values ​​and exhibits aperiodicity, even if they know the secure mapping method, they would be unable to correctly decode legitimate signals. The physical layer security technology proposed in this invention offers both high security and high spectral efficiency.
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