Wireless Communication Security via Coordinated Multipoint Transmission
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Solution Overview
Problem
Existing channel-based adaptation mechanisms in physical layer security fail to protect against eavesdropping attacks when the eavesdropper's channel is better than the legitimate node, leading to inter-symbol interference and performance degradation.
Innovation Solution
A method involving coordinated multipoint transmission that splits data into parts and manipulates channels to ensure the legitimate receiver experiences a delay spread less than the guard duration, while the eavesdropper experiences inter-symbol interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel-based adaptation techniques (e.g., channel shortening) are used to protect against eavesdropping, then security is improved for legitimate nodes, but the eavesdropper experiences better channel conditions and can still receive data cleanly
Solution Approach 1:
The data is divided into multiple parts and transmitted through different coordinated transmission points. This segmentation ensures that even if the eavesdropper has better channel conditions for receiving some parts, it cannot reconstruct the complete data without all parts, thereby maintaining security while adapting to varying channel conditions.
Solution Approach 2:
Channel-based manipulation (e.g., channel shortening) is applied selectively to ensure that the delay spread experienced by the legitimate node is less than the guard duration, while the eavesdropper experiences larger delay spread leading to inter-symbol interference. This local quality adjustment provides security adaptability to different channel conditions.
2Reliability
If channel shortening is applied to ensure delay spread is less than guard duration for legitimate nodes, then inter-symbol interference is avoided for legitimate receivers, but the eavesdropper experiences larger delay spread and inter-symbol interference
Solution Approach 1:
The channel manipulation technique is designed to create different channel characteristics for different receivers. The legitimate node experiences a shortened channel with delay spread less than guard duration, avoiding inter-symbol interference. The eavesdropper experiences the original or differently manipulated channel with larger delay spread, causing inter-symbol interference and deteriorating performance.
Solution Approach 2:
The technique intentionally creates inter-symbol interference for the eavesdropper as a beneficial security measure. What would normally be considered a harmful effect (inter-symbol interference) is converted into a security advantage by ensuring it only affects the eavesdropper and not the legitimate receiver.
3Reliability
If data is split into multiple parts and sent over different links from coordinated transmission points, then security is improved even when eavesdropper is closer, but system complexity increases
Solution Approach 1:
The data is segmented into multiple parts and assigned to different coordinated transmission points. This segmentation provides security because the eavesdropper would need to intercept all parts from multiple points to reconstruct the data, increasing the difficulty of eavesdropping despite the eavesdropper's proximity to some transmission points.
Solution Approach 2:
Multiple transmission points are coordinated and merged to work together as a unified secure communication system. The coordination mechanism manages the complexity by synchronizing the transmission of different data parts, achieving security benefits while controlling system complexity through standardized coordination protocols.
Data Source
AI summary
Disclosed is a method to protect wireless communication signals from being overheard/intercepted by malicious eavesdroppers. The method has three main steps: selection of the coordinating transmission points (TPs) for the user whose communication is to be secured, splitting of the data that is to be sent to the aforementioned user into N parts, where N is the number of TPs used and channel based manipulation of the transmitted signal to ensure that delay spread is less than guard duration.