Physical layer safety transmission method of manual noise based on constellation rotation

Abstract

The invention provides a physical layer safety transmission method of manual noise based on constellation rotation. A technical problem that a wireless communication system is small in secrecy capacity in the prior art is solved. The realization step is as follows: a source node S acquires channel state information to a destination node D, produces a sending signal and performing beamforming on the sending signal, produces manual noise and performs the constellation rotation at the specified angle and the beamforming; the source node S overlaps the sending signal after beamforming and the manual noise after constellation rotation as a compound signal, and sends the compound signal; the destination node D receives the compound signal passing through a channel, and demodulates the same to acquire a demodulated signal. By performing the constellation rotation on the manual noise, the receiving signal signal-to-noise ratio of a sending end can be obviously improved, and the signal-to-noiseratio of an illegal eavesdropping terminal can be maintained at the low value level, thereby improving the secrecy capacity of the wireless communication system, and the security of the wireless communication system is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a physical layer transmission method of artificial noise, in particular to a constellation rotation-based safe physical layer transmission method of artificial noise, which can be used in a secure communication system using digital phase modulation technology at the transmitting end. Background technique [0002] Due to the openness of the transmission medium, the mobility of the wireless terminal and the instability of the network structure in the wireless communication system, the reliability and security of signal transmission are facing severe challenges. Studies have shown that, in addition to the traditional high-level encryption methods, the problem of secure transmission can also be solved by physical layer security technology. As a supplement or replacement technology of the upper layer encryption method, the physical layer security technology uses the characteristic...

AI Technical Summary

Problems solved by technology

This method improves the signal-to-noise ratio of the legitimate receiving end to a certain extent, and at the same time maintains the signal-to-noise ratio of the illegal eavesdropping end at a low level, which improves the confidentiality capacity of the communication system. Although this method uses an adaptive artificial interference method, the Artificial noise is still not always beneficial to the demodulation signal at the legal receiving end, so this method also has the problems of limited confidentiality improvement and insufficient security performance

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