High-speed rail communication secure transmission method based on active RIS assistance

By using an active RIS-assisted high-speed rail communication system, the channel model and reflection coefficient matrix are optimized, solving the problems of poor channel conditions and insufficient security in traditional high-speed rail communication systems under high-speed motion. This achieves efficient and reliable communication transmission and anti-eavesdropping capabilities, while reducing system energy consumption.

CN121888263APending Publication Date: 2026-04-17CHENGDU TECH UNIV
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Patent Information

Application Number
CN202511978020.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-25
Publication Date
2026-04-17

AI Technical Summary

Technical Problem

Traditional high-speed rail communication systems suffer from poor channel conditions and limited transmission distances under high-speed motion, and lack effective security measures, resulting in low communication quality, poor reliability, high construction and maintenance costs, and inability to resist eavesdropping attacks.

Method used

The high-speed rail communication system with active RIS assistance constructs a channel model, defines the reflection coefficient matrix, optimizes the base station beamforming vector and the phase shift matrix of the active RIS, and uses an alternating optimization algorithm to minimize the base station transmit power, thereby enhancing signal transmission and anti-eavesdropping capabilities.

Benefits of technology

It significantly improves the safety and transmission efficiency of high-speed rail communication, enhances signal transmission distance and penetration, ensures seamless coverage, reduces system energy consumption, and meets the reliability requirements of high-speed operation.

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Abstract

The invention belongs to the technical field of high-speed rail communication security, and discloses a high-speed rail communication secure transmission method based on active RIS assistance. Comprising the following steps: constructing a high-speed rail communication system comprising a base station, an active RIS, a mobile relay and an eavesdropper; establishing a channel model; defining a reflection coefficient matrix of the active RIS; deriving received signal expressions of the mobile relay and the eavesdropper; calculating the signal-to-noise ratio of the mobile relay and the eavesdropper, and solving the channel capacity of the mobile relay and the eavesdropper according to the Shannon theorem; establishing an optimization problem taking the minimum transmitting power of the base station as a target, and setting a constraint condition; the beamforming vector of the base station and the phase shift matrix of the active RIS are jointly optimized, and an optimization problem is solved through an alternating optimization algorithm so as to realize the minimization of the transmitting power of the base station; seamless coverage and stable connection in the high-speed running process of the train are ensured, and the high-reliability requirement of high-speed rail communication is met.
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