Multi-Frequency Channel State Information Authentication
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Solution Overview
Problem
Existing physical layer authentication systems face challenges in maintaining security stability and reliability due to false authentication caused by a strong association between legitimate and illegitimate channel state information in indoor environments.
Innovation Solution
A multi-frequency band indoor channel state information-based physical layer authentication system that uses multiple center frequencies to modulate and demodulate signals, allowing for the estimation of channel state information and the determination of device legitimacy through a hyperplane formed by legitimate and illegitimate data groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-frequency band channel state information is used for authentication, then authentication simplicity is maintained, but false authentication occurs due to strong association between legitimate and illegitimate channel state information in indoor environments
Solution Approach 1:
The patent divides the authentication process into multiple frequency bands (first, second, and third frequency bands) instead of using a single frequency band. By segmenting the channel state information across multiple frequency bands and comparing them collectively, the system achieves more reliable authentication while maintaining manageable complexity through modular processing of each frequency band's data.
2Reliability
If multi-frequency band channel state information is used for authentication, then false authentication is prevented and security reliability is enhanced, but system complexity increases
Solution Approach 1:
The patent merges channel state information from multiple frequency bands (first, second, and third frequency bands) into a unified authentication decision. By combining the characteristics of channel state information across different frequency bands and evaluating them together, the system enhances authentication reliability while managing complexity through integrated processing.
3Speed
If indoor channel state information is used for authentication, then authentication speed is maintained, but false authentication occurs due to monotonic channel changes in indoor environments
Solution Approach 1:
The patent transitions from single-dimensional (single frequency band) channel state information analysis to multi-dimensional analysis by incorporating multiple frequency bands. This dimensional expansion allows the system to distinguish between legitimate and illegitimate channel state information more precisely while maintaining authentication speed through parallel processing of frequency band data.
Data Source
AI summary
A system for multi-frequency band indoor channel state information-based physical layer authentication comprises a first wireless communication device that is an authentication requesting node and a second wireless communication device that is an authentication verifying node, wherein the first wireless communication device comprises a transmitting unit that sequentially modulates device identification information and a given pilot signal for identifying the first wireless communication device into a plurality of signals based on a plurality of set center frequencies and transmits the plurality of signals, and the second wireless communication device comprises a receiving unit that receives the plurality of signals transmitted from the first wireless communication device and estimates a plurality of channel state information based on the plurality of center frequencies respectively and a physical layer authentication processing unit that determines whether the first wireless communication device is authenticated based on the estimated plurality of channel state information.