Subcarrier Classification for Wireless Security Without Pre-Shared Keys
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Solution Overview
Problem
Wireless communication systems face security vulnerabilities due to the risk of eavesdropping when pre-shared security keys are leaked, and existing physical layer security schemes require channel information with both intended and eavesdropper nodes, complicating security maintenance, especially with limited antenna numbers.
Innovation Solution
A method and apparatus for secure communication in a multi-subcarrier wireless system, where nodes classify subcarriers into data and jamming groups based on channel information, using a reference value to transmit data and jamming signals, ensuring security without pre-sharing a security key, by estimating the radio channel and determining subcarrier groups for secure data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-shared security key scheme is used, then security is achieved, but security performance deteriorates when the security key is leaked
Solution Approach 1:
The patent extracts the security mechanism from pre-shared key dependency and implements physical layer security directly at the communication nodes. By using channel information and reference values that can be derived from the radio channel itself, the system eliminates the need for separate security keys, thereby removing the vulnerability associated with key leakage while maintaining security functionality.
Solution Approach 2:
The patent introduces a reference value as an intermediary element that enables secure communication without direct key sharing. This reference value is derived from channel information and serves as a mediator to establish security at the physical layer, allowing nodes to authenticate and encrypt communications based on the radio channel characteristics rather than pre-shared secrets.
2Reliability
If physical layer security scheme is used, then security without pre-shared key is achieved, but channel information with eavesdropper complicates security maintenance
Solution Approach 1:
The patent segments the subcarriers into different groups (first subcarrier group for data signals and second subcarrier group for jamming signals) based on channel information. This segmentation allows the system to manage complexity by processing channel information in organized portions and applying different treatments to different subcarrier groups, thereby maintaining security while reducing the overall complexity of handling eavesdropper channel information.
3Reliability
If additional antennas are added to improve security, then security performance improves, but device complexity increases
Solution Approach 1:
The patent changes the approach from physical layer hardware expansion (adding antennas) to parameter-based security implementation. By utilizing channel information parameters and reference values that can be derived from existing radio channel measurements, the system achieves improved security performance without requiring additional physical antennas, thereby maintaining device simplicity while enhancing security capabilities.
Data Source
AI summary
A security signal transmission method performed by a first communication node includes estimating a radio channel between the first communication node and a second communication node; classifying all subcarriers into a first subcarrier group for transmitting a data signal and a second subcarrier group for transmitting a jamming signal based on estimated channel information; generating data symbol(s) by allocating the data signal to subcarriers of the first subcarrier group; generating jamming symbol(s) by allocating the jamming signal to subcarriers of the second subcarrier group; generating a first control symbol to which a first control signal is mapped, the first control signal including a first reference value used to restore the data symbols at the second communication node; and transmitting the data symbol(s), the jamming symbol(s), and the first control symbol to the second communication node.