Physical layer secret communication system based on single sideband time modulation array

Abstract

The invention discloses a physical layer secret communication system based on a single sideband time modulation array. The system comprises N transmitting antenna units, N high-power amplifiers, N time modulation modules, a radio frequency state controller, N quasi-periodic state control sequences, an N-path equipower distribution network, a modulator, a signal generator, a local oscillator, a receiving antenna, a low-noise amplifier, a demodulator and a digital signal processor, wherein the quasi-periodic state control sequence is composed of two periodic state control sequences which are not completely the same and a binary pseudo-random sequence. The N quasi-periodic state control sequences respectively control the working states of the N time modulation modules. The quasi-periodic state control sequences of the N time modulation modules are reasonably designed, so that high-precision beam scanning can be realized, high-performance direction modulation can also be realized, and the system has the characteristics of simple structure, excellent secrecy performance and communication performance and the like.

Description

technical field [0001] The invention relates to the technical field of antenna engineering, in particular to a physical layer security communication system based on a single sideband time modulation array. Background technique [0002] In 1878, the British-American inventor David Edward Hughes used a transmitter to transmit radio hundreds of meters away, which opened the prelude to the brilliant development of wireless communication technology. Since then, wireless communication systems have come a long way. At the same time, the consequences of information confidentiality are becoming more and more serious. Therefore, the information security issues of wireless communication systems are highly valued by scholars in different fields. In traditional phased-array systems, the only differences in amplitude and relative delay between transmitted information are in the desired and undesired directions. Theoretically, in a sufficiently long time, a high-sensitivity receiver can...

AI Technical Summary

Problems solved by technology

In these studies, the time modulation technology only achieves the direction modulation performance, and the beam scanning still needs complex high-precision digital phase shifters

[0004] Based on the above analysis, the existing time modulation technology cannot realize the performance of beam scanning and direction modulation at the same time, and the beam scanning technology obtained with the help of high-precision phase shifter is bound to increase the complexity of system hardware

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