Wireless Channel Phase Pre-equalization for Eavesdropping Prevention
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Solution Overview
Problem
Existing wireless communication systems are vulnerable to eavesdropping due to the lack of effective methods to secure data transmission without relying on pre-shared sequences or complex receiver designs.
Innovation Solution
A method that pre-equalizes the channel phase between legitimate transceivers by estimating the wireless channel, extracting the channel phase vector, and rotating the modulated symbols by an angle equal to the negative of the instantaneous channel phase, thereby securing the transmitted data without the need for pre-shared sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-shared sequences are used for security, then eavesdropping resistance is improved, but key management complexity and signaling overhead increase
Solution Approach 1:
The patent extracts the security mechanism from pre-shared sequences and key management protocols, replacing them with channel-based phase pre-equalization that leverages the physical wireless channel characteristics. This eliminates the need for complex key distribution and management while maintaining security through physical layer operations.
Solution Approach 2:
The system uses the wireless channel itself as the security mechanism. The channel phase information, which is naturally obtained during normal channel estimation for communication, is directly utilized for phase pre-equalization. This self-service approach eliminates external key management dependencies by making the channel characteristics the security resource.
2Reliability
If constellation rotation or mapping obfuscation is applied, then eavesdropping resistance is improved, but receiver complexity increases due to additional processing requirements
Solution Approach 1:
The patent applies preliminary action by performing phase pre-equalization at the transmitter before modulation and transmission. The channel phase is estimated and used to rotate the constellation symbols in advance, so that the legitimate receiver only needs to perform simple phase correction without complex obfuscation reversal operations.
Solution Approach 2:
Instead of obfuscating the constellation at the receiver end, the patent inverts the approach by pre-equalizing the phase at the transmitter end. This reverses the traditional PLS approach where the receiver performs complex decryption operations, making the receiver simpler while maintaining security.
3Reliability
If artificial interfering signals are added, then eavesdropping resistance is improved, but channel capacity and throughput degrade
Solution Approach 1:
The patent changes the parameter approach by modifying the phase characteristics of the transmitted signal through pre-equalization rather than adding artificial interfering signals. This parameter transformation achieves security through phase rotation that exploits channel reciprocity, avoiding the throughput penalty associated with signal addition and interference.
Data Source
AI summary
Disclosed is a method to improve the confidentiality against eavesdropping in wireless communication. The method involves pre-equalizing the channel phase between the legitimate transceivers.