Wireless security transmission technology based on random frequency diversity array and directional modulation

Abstract

The invention provides an accurate wireless security transmission technology based on a random frequency diversity array (RFDA) and directional modulation (DM). According to the invention, artificial noise (AN) is projected to the desired position-oriented vector zero space to interfere with surrounding potential eavesdroppers, which enhances the security of signal transmission. Compared with a traditional directional modulation technology based on a phased array (PA), the technology provided by the invention uses the random frequency diversity array to elevate security transmission from one dimension (angle) to two dimensions (distance and angle) to realize accurate point-to-point signal transmission. According to the invention, a closed expression of the lower bound of the traversal security rate is acquired; the influence of power allocation and frequency allocation on the performance of the technology provided by the invention is investigated; and compared with the original directional modulation technology, the technology can effectively improve the security transmission rate.

Description

technical field [0001] The present invention relates to the technical field of wireless communication physical layer secure transmission, in particular to a precise wireless secure transmission technology based on random frequency diversity array and direction modulation. Background technique [0002] As a new physical layer security technology, direction modulation has been widely concerned and researched by domestic and foreign scholars in recent years. In conventional beamforming systems, the main lobe is pointed directly in the desired direction to ensure reliable transmission. This kind of method can get the maximum received power in the predetermined direction, but information leakage may occur on the side lobe. A directional modulation system guarantees safe transmission in the desired direction while distorting the constellation of signals in all other directions. Even if the signal power received by the eavesdropping end is the same as or even higher than the expe...

AI Technical Summary

Problems solved by technology

[0005] Frequency diversity arrays can generate controllable distance-angle beam patterns, which brings hope to solve the above problems, but traditional frequency diversity arrays, that is, linear frequency diversity arrays, generate beam patterns with distances and angles. Coupling phenomenon occurs, Security holes periodically appear at unexpected angles and distances

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