Method and device for generating wireless channel key based on phase assistance of intelligent reflector
A wireless channel and phase-assisted technology, applied in wireless communication and key distribution, can solve problems such as high cost, application limitations, and difficulty in encrypting keys in sequences, so as to achieve flexible use, reduce system costs, enhance flexibility and environmental adaptation. sexual effect
Active Publication Date: 2022-08-09
NAT UNIV OF DEFENSE TECH
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However, the effectiveness of this wireless channel key extraction method depends on the state change of the wireless channel, so in a static environment or quasi-static (channel time-varying is not strong), the extracted key will present a continuous sequence of 0 or 1 , these sequences are difficult to use as encryption keys due to lack of randomness and are easily predictable by an eavesdropper
In order to solve this problem, the probe signal can be sent and received through the controllable array antenna, and then the key can be extracted, but the cost of this scheme is too high, so its application is greatly limited
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[0044] In order to make the objectives, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.
[0045] Aiming at the problem of key extraction in static channels, this application proposes a wireless channel key generation method based on the phase assistance of intelligent reflecting surfaces based on the advantages of intelligent reflecting surfaces, which can effectively ensure the randomness and security of key extraction in static environments. . In this method, both legitimate communication parties apply the smart reflector in the channel detection process to randomize the phases of the detection signal and the received signal.
[0046] A method for generating a wir...
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The present application relates to a method and device for generating a wireless channel key based on phase assistance of an intelligent reflective surface. The method includes: a detection terminal sends a detection signal including a plurality of subcarriers of different frequencies to a quantization terminal through a direct channel and a random channel, and the random channel is formed by controlling the phase offset value of each subcarrier on the intelligent reflection surface by the controller. . The quantization end performs channel estimation to obtain the phase offset value of each subcarrier, and then obtains the key data used by the detection end and the quantization end in the current communication. In this application, the intelligent reflective surface can dynamically configure the phase offset value of the incident signal, change the phase of each sub-carrier in the detection signal, and make the channel between static or quasi-static nodes change state, so that the channel extracted by channel estimation The sequence can satisfy the requirements of the key. In addition, the IRS is flexible in use and can be easily deployed in various locations, which can enhance its application flexibility and environmental adaptability, and reduce system costs.
Description
technical field [0001] The present application relates to the technical field of wireless communication channel encryption, and in particular, to a method and device for generating a wireless channel key based on phase assistance of an intelligent reflective surface. Background technique [0002] The characteristics of time-varying, space-time uniqueness and short-term reciprocity of the wireless channel make it a natural source of randomness. For a mobile communication node, any node of the sender and receiver can change the corresponding channel feature detection by continuously moving the position during the channel detection process. However, the effectiveness of this wireless channel key extraction method depends on the state change of the wireless channel, so in a static environment or quasi-static (channel time-varying is not strong), the extracted key will present a continuous sequence of 0 or 1 , these sequences are difficult to use as encryption keys due to their ...
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IPC IPC(8): H04W12/041H04L9/08H04L25/02
CPCH04L9/0877H04L25/0224Y02D30/70
Inventor 雷菁鲁信金刘伟
Owner NAT UNIV OF DEFENSE TECH