Physical layer secure transmission method for resisting information eavesdropping of eavesdropping node

Abstract

The invention discloses a physical layer secure transmission method for resisting information eavesdropping of an eavesdropping node. The physical layer secure transmission method comprises the steps that: 1) a source node and a target node sequentially send a training sequence before the beginning of information transmission, so that the source node and the target node estimate equivalent channel information h<n, k> from the source node to the target node, wherein n is contained in {1, ... , Nr}, k is contained in {1, ... , Nt}, Nt is antenna number set by the source node, and Nr is antenna number set by the target node; 2) the source node encodes to-be-transmitted data, obtains a to-be-transmitted symbol and an antenna serial number for transmitting the to-be-transmitted symbol, then adds artificial noise into the to-be-transmitted symbol, and transmits the to-be-transmitted symbol added with the artificial noise to the target node through a selected antenna; 3) and the target node receives the symbol transmitted by the source node, decodes the symbol transmitted by the source node by means of a maximum likelihood decoder, and completes physical layer secure transmission of information. The physical layer secure transmission method can achieve physical layer secure transmission of the information.

Description

technical field [0001] The invention belongs to the technical field of physical layer security of a wireless multiple-input multiple-output system, and relates to a physical-layer secure transmission method for resisting information theft by eavesdropping nodes. Background technique [0002] MIMO technology can provide higher system capacity and reliability, and is an important research topic in the field of wireless communication. Spatial modulation is a newly proposed multi-antenna transmission technology in recent years. This technology introduces a spatial dimension in the process of information bit modulation, thereby changing the number of active antennas according to the input information. On the basis of inheriting all the advantages of space modulation, orthogonal space modulation improves the spectrum efficiency of the whole system. Because the inter-antenna interference of spatial modulation is low and the signal processing at the receiving end is relatively simp...

AI Technical Summary

Problems solved by technology

Most of the existing research on physical layer security technology for space modulation technology uses artificial noise generated at the source node to interfere with the eavesdropping node, because this artificial noise is in the null space of the channel between the bit and the source node and the destination node, so, The artificial noise will not interfere with the destination node, but it will interfere with the eavesdropping node. However, when the channel between the source node and the destination node is a full-rank matrix, there is no null space between them. Therefore, this The security of such schemes cannot be guaranteed

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