Wireless channel characteristic stepwise quantification method based on unitary transformation preprocessing

Abstract

The invention discloses a wireless channel characteristic stepwise quantification method based on unitary transformation preprocessing. The method comprises the following steps: making a party A and a party B in wireless communication perform unitary-transformation-based preprocessing on channel detection results; quantifying preprocessed signal vectors with different signal-to-noise ratios with different quantification levels; and finally, using generated quantification bit streams as inputs of subsequent wireless channel key generation steps such as an information reconciliation step. Through adoption of the method, the consistency of the channel detection results of the party A and the party B in the wireless communication can be improved effectively; the auto-correlation of the channel detection results is lowered; and the two parties of the communication can generate quantification bit streams with high rate, high consistency and low redundancy. The method is applied to the field of wireless channel key generation, can be specifically applied to the fields of secure communications, military communications and the like, and can be extended to a multi-node communication scene. Through adoption of the method, the security of a wireless communication system is enhanced.

Description

technical field [0001] The invention belongs to the field of communication security and relates to key generation technology in wireless communication systems. Background technique [0002] The broadcast characteristics of wireless media make the reliability and security of wireless communication face severe challenges. The traditional solution is to encrypt data through public and private keys at the network layer. However, in dynamic wireless networks, symmetric encryption methods also face the problem of key distribution. At the same time, in the emerging wireless sensor networks, due to limited resources or lack of key management facilities, sensor nodes cannot afford the high power and high cost of asymmetric algorithms. [0003] In recent years, key generation schemes based on wireless channel characteristics have received extensive attention. Since the wireless channel characteristics in different spaces are unique, when the distance between the eavesdropper and the...

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Problems solved by technology

[0004] However, due to the influence of time delay, equipment differences, environmental noise and measurement noise, the wireless channel characteristics observed by both communication parties have deviations.

These deviations eventually lead to large gaps between the keys generated by the communicating parties

In addition, oversampling, multi-carrier and multi-antenna technologies can be used to increase the dimension and generation rate of the key, but at the same time, it also leads to the high redundancy and high autocorrelation of the wireless channel characteristics observed by both communication parties.

These redundancies and autocorrelations will eventually lead to a reduction in the randomness of the keys generated by both parties in communication and a reduction in system efficiency.

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