Secure HARQ Communication With Digital Artificial Noise
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Solution Overview
Problem
Existing secure communication protocols, such as HARQ schemes, are not suitable for air-to-ground communications due to low signal-to-noise ratios and the potential for eavesdroppers to decode data packets, especially when the eavesdropper's channel quality is better than the legitimate receiver's channel.
Innovation Solution
A hybrid automatic-repeat-request (HARQ) protocol combined with forward error correction (FEC) and the intentional introduction of artificial noise to data packets, where the artificial noise is digitally added before conversion to the analogue domain, ensuring only the legitimate receiver can decode the message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HARQ communication schemes are used, then communication reliability is improved through error correction, but security deteriorates because eavesdroppers can decode data packets when their channel quality is better than the legitimate receiver's channel
Solution Approach 1:
The patent converts the harmful effect of artificial noise (which normally degrades signal quality) into a beneficial security mechanism. By intentionally adding artificial noise to transmitted data packets, the system ensures that only the legitimate receiver (who has knowledge of the noise sequence) can successfully decode the message, while eavesdroppers experience degraded signal quality and cannot extract meaningful information. This transforms noise from a detrimental factor into a protective security layer.
Solution Approach 2:
The patent changes the signal parameters by adding controllable artificial noise components to the transmitted data packets. The noise sequence is carefully designed and synchronized between transmitter and legitimate receiver, allowing the receiver to subtract the known noise component and recover the original message. This parameter modification creates a security barrier that differentiates between authorized and unauthorized receivers based on their knowledge of the noise sequence.
2Object-affected harmful factors
If artificial noise is added to data packets to prevent eavesdropping, then security is improved, but communication reliability deteriorates due to increased signal degradation
Solution Approach 1:
The patent converts the harmful effect of artificial noise (which normally degrades signal quality) into a beneficial security mechanism. By intentionally adding artificial noise to transmitted data packets, the system ensures that only the legitimate receiver (who has knowledge of the noise sequence) can successfully decode the message, while eavesdroppers experience degraded signal quality and cannot extract meaningful information. This transforms noise from a detrimental factor into a protective security layer.
Solution Approach 2:
The system employs feedback mechanisms where the transmitter and legitimate receiver share knowledge of the artificial noise sequence through pre-established synchronization or feedback channels. This feedback loop allows the legitimate receiver to compensate for the added noise by subtracting the known noise component, thereby recovering the original signal. The feedback mechanism ensures that security enhancement does not compromise reliability for authorized users.
3Reliability
If re-transmissions are performed according to HARQ protocol to correct errors, then communication robustness is improved, but security deteriorates because re-transmissions provide eavesdroppers with additional opportunities to decode data packets
Solution Approach 1:
The patent applies preliminary action by adding artificial noise to the original data packet before transmission, rather than relying solely on re-transmissions for error correction. This pre-emptive noise addition ensures that even if re-transmissions occur, the eavesdropper cannot effectively decode any of the transmitted packets because the artificial noise is present in all transmissions and can only be removed by the legitimate receiver who knows the noise sequence. This preliminary security measure eliminates the vulnerability that would otherwise arise from multiple transmission opportunities.
Solution Approach 2:
The patent converts the harmful effect of artificial noise (which normally degrades signal quality) into a beneficial security mechanism. By intentionally adding artificial noise to transmitted data packets, the system ensures that only the legitimate receiver (who has knowledge of the noise sequence) can successfully decode the message, while eavesdroppers experience degraded signal quality and cannot extract meaningful information. This transforms noise from a detrimental factor into a protective security layer.
Data Source
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Figure 3A~3B
AI summary
A method of transmitting a message from a sender (101) to a receiver (102) is provided, wherein the communication between the sender (101) and receiver (102) is performed using a hybrid automatic-repeat-request (HARQ) protocol. Artificial noise is added digitally to a first data packet in order to trigger transmission of a second data packet. Corresponding artificial noise is added digitally to the second data packet such that the receiver device (102) can process the data packets together to remove the introduced artificial noise and extract the desired message. Also disclosed are methods where artificial noise is added to a predetermined set of plural data packets in a similar fashion.