Fixed-region beamforming physical-layer secure transmission system and method

Abstract

The present invention relates to the field of physical-layer security for wireless communications, and provides a fixed-region beamforming physical-layer secure transmission system and method, so as to solve the technical defect that conventional directional angle beamforming and rotating angle beamforming are liable to be intercepted by intelligent eavesdropping equipment due to a fixed long-distance main lobe transmission trajectory. The system comprises a baseband modulation module, a frequency adjustment module and a phased array module. The phased array is divided into a plurality of multi-frequency phased sub-arrays to transmit a plurality of rotating sub- beams; the sub-beams are effectively superposed to form a main beam lobe within a tiny region at a target receiving position, and cancel each other outside the target region to form sidelobes. Sidelobe randomization is realized by equal-probability switching of frequency offset increments.