Safety rate maximization synthesis method based on general inverse iteration in direction modulation

Abstract

The invention provides a safety rate maximization synthesis method based on general inverse iteration in direction modulation, comprising the following steps of: before designing a useful signal beamforming vector and an artificial noise projection matrix, firstly initializing the two by using a leakage concept, then updating the artificial noise projection matrix by using a general power iterative (GPI), and synchronously updating the useful signal beam forming vector by the Rayleigh-Ritz method. In order to maximize the safety rate, an alternately iterative structure (AIS) is used in designing the useful signal beam forming vector and the artificial noise projection matrix, and the corresponding safety rate needs to be updated in time. Compared with the traditional direction modulationtechnology, the safety rate of the invention is greatly improved at a medium to high signal-to-noise ratio, a useful signal can be demodulated well in a desired direction and is difficult to recover in an undesired direction, thereby better improving the safety performance of the system.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a synthesis method for maximum security rate based on generalized inverse iteration in direction modulation. Background technique [0002] In recent years, with the rapid development of mobile communication networks, the privacy of information has become particularly important. The traditional upper-level encryption technology only solves problems through mathematical methods. Once the solution to the mathematical problem is found, the communication process is very easy. Attacked by illegal users. Therefore, researchers began to turn their attention to the underlying security transmission technology, that is, the physical layer security transmission technology. The most important point to ensure safe transmission is to improve the communication quality of the expected channel and reduce the quality of the eavesdropping channel, so as to ensure the safe transmissio...

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Problems solved by technology

[0004] However, in many three-point (transmitter, desired receiver, eavesdropping receiver) directional modulation schemes that do not consider the estimated angle error, how to maximize the security rate is an NP-hard problem

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