A method and device for quantizing a key of an underwater acoustic physical layer

By constructing a quantization guard interval using OFDM pilot signals and clustering algorithms in underwater acoustic communication, the problem of low key sequence consistency rate in underwater acoustic communication is solved, achieving low key mismatch rate and appropriate key generation rate under high signal-to-noise ratio conditions.

CN116614223BActive Publication Date: 2026-03-20Chinese People's Liberation Army Cyberspace Force Information Engineering University
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Patent Information

Application Number
CN202310496619.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-05
Publication Date
2026-03-20
Estimated Expiration
2043-05-05

AI Technical Summary

Technical Problem

In underwater acoustic communication, due to hardware differences and environmental noise, the consistency rate of key sequences generated by the communicating parties is reduced. Traditional key distribution and management techniques are difficult to apply to underwater acoustic environments, and feedback-based quantization methods result in excessive communication overhead.

Method used

The observation sequence of channel frequency response is obtained by sending OFDM pilot signals. Clustering is performed using the K-means algorithm and membership function to construct the quantization guard interval, remove fuzzy observation points, and generate the physical layer key.

Benefits of technology

It reduces the key mismatch rate, is suitable for high signal-to-noise ratio underwater acoustic channel conditions, and balances the key generation rate and mismatch rate performance, making it suitable for resource-constrained underwater acoustic environments.

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Abstract

The present application belongs to the technical field of underwater acoustic physical layer, and particularly relates to a kind of underwater acoustic physical layer key quantization method and device, to be used in the condition of underwater acoustic channel under high signal-to-noise ratio Quantization and key generation, legal communication parties complete channel sounding in channel sounding stage using OFDM signal, and extract the observation sequence containing channel frequency response characteristics;Communication parties use clustering method to complete clustering to obtain cluster center, then build quantization protection interval through membership discrimination, and remove the fuzzy boundary observation point in the protection interval.The present application can solve the problem of quantization error caused by the inconsistency of observation sequence due to local noise difference under high signal-to-noise ratio, and by using the idea of clustering and protection interval to build irregular quantization protection interval, the quantization boundary point is removed, and under the condition of underwater acoustic environment and / or high signal-to-noise ratio, a lower initial key mismatch rate can be obtained, which is convenient for practical scene application.
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