Self-adaptive safety communication device and method based on vortex electromagnetic waves

Abstract

The invention discloses a self-adaptive safety communication device and method based on vortex electromagnetic waves, and relates to the technical field of wireless communication. Generating a direction radiation coefficient table of the N-element uniform circular ring antenna array under a given carrier frequency; adaptively selecting an orbital angular momentum mode for sending the artificial noise; orbital angular momentum modulation of the sending signal and the artificial noise; the invention relates to coaxial multimode multiplexing transmission of orbital angular momentum. According to the invention, the secure wireless communication can be realized by using only one uniform circular ring antenna array. The artificial noise is multiplexed in a non-zero mode, so that legal users are not interfered, the channel capacity of eavesdroppers is reduced, and high-capacity secret communication is realized. Meanwhile, according to the direction angle information of the eavesdropper, the optimal mode of the artificial noise is adaptively selected, the eavesdropper is shielded to the maximum extent, and the secrecy performance of the system is improved. And when the direction of the eavesdropper is unknown, a mode of random hopping of an artificial noise mode is adopted to shield potential eavesdroppers in all directions, so that the secrecy capacity of the system is improved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to the technical field of an adaptive security communication method based on vortex electromagnetic waves. Background technique [0002] At present, the security of wireless communication is facing more and more serious challenges. First, security measures based on computational theory are increasingly vulnerable. For a long time, the security of wireless communication mainly relies on authentication and encryption technology, which is guaranteed at the upper level of the communication protocol stack. However, as some widely used encryption algorithms have been cracked in recent years, such as KASUMI, AES128 / 256, MD5, etc., the vulnerability of the passive defense system has been exposed. The rapid development of quantum computing also makes the security methods based on computing theory face serious challenges. Secondly, wireless communication is naturally...

AI Technical Summary

Problems solved by technology

However, as some widely used encryption algorithms have been cracked in recent years, such as KASUMI, AES128 / 256, MD5, etc., the vulnerability of the passive defense system has been exposed.

The rapid development of quantum computing also makes the security methods based on computing theory face serious challenges

Secondly, wireless communication is naturally open and broadcast, and is more likely to be intercepted and eavesdropped by a third party

Third, the physical layer at the bottom of the protocol stack lacks necessary security measures

[0010] This method does not give full play to the OAM multi-mode multiplexing communication technology, and the structure of the transmitting antenna is complex and has large redundancy, which is not conducive to the practical application of this technology

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