Physical Layer Key Extraction Method Based on Channel Gain Compensation and Subcarrier Correlation

Abstract

The invention provides a physical layer key extraction method based on channel gain compensation and subcarrier correlation. First, collect and detect channel state information; then, perform channel gain compensation through non-reciprocity learning to enhance the reciprocity of the channel state information of both parties; then, obtain a more reliable initial key by subcarrier clustering as a whole and quantify ;Finally, conduct consensus negotiation and enhancement processing on the initial key to obtain the final security key. The present invention utilizes channel gain compensation and subcarrier correlation analysis to realize safer and more effective data communication in the original communication system based on channel state information, and provides more reliable key bit stream with low bit error rate for wireless encrypted communication.

Description

technical field [0001] The invention belongs to the technical field of communication security, and in particular relates to a physical layer key extraction method based on channel gain compensation and subcarrier correlation. Background technique [0002] Wireless communication has been widely used in civilian and military fields. For example, Wi-Fi communication is commonly used in daily life. It does not need to arrange cumbersome network cables, and you can place your laptop anywhere in the Wi-Fi area to access the Internet. Another example is In the military field, the communication between UAVs and the communication between UAVs and ground stations can build a mobile ad hoc network between UAV groups and ground stations for wireless communication. However, due to the openness of the wireless communication medium, the signal is easily eavesdropped within the effective wireless coverage area, so in the scenario of confidential communication, a preset key is often used for...

AI Technical Summary

Problems solved by technology

Secure data communication can be achieved, but its channel estimation and quantization methods are relatively rough, resulting in a high mismatch rate between the two parties before quantization, and a low key generation rate

[0007] However, there are two problems in the existing physical layer key extraction method based on channel state information: first, although the channel state information of both communication parties has reciprocity, for the OFDM system, in the actual experimental environment, some of the communication parties The reciprocity between sub-carriers may not be ideal, which will have a negative impact on the consistency rate of the bit stream quantized by both parties in the communication; second, in the formal quantization process, the methods mentioned above ignore adjacent sub-carriers There is an experimental fact that generally there is a relatively strong correlation between

However, this method does not make full use of all subcarrier information, so an optimization scheme that can avoid using redundant information and make full use of all subcarrier information is needed

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