Research On Key Technologies Of Covert Communication

Covert communication is also known as low-probability,low-interception(LPD,LPI)communication,which is often applied to military security communications.Due to the characteristics of wireless communication,it is easy to expose the existence of communication links and nodes,and subsequent transmission of information is facing a major threat.Therefore,when designing a communication system,one should not only consider the business indicators of the communication itself,but also pay attention to the requirements of communication security to ensure that signals are not detected by the enemy.This article mainly discusses the main technology of covert communication.It proposes three models in different scenarios to achieve the covert communication of positive rate,and gives the design scheme of covert performance and the optimization direction of covert rate.The details are as follows:(1)Aiming at the problem that the reliable transmission rate of hidden communication is too low,based on the research ideas of interference signals,a model of intelligent jammer is proposed.The design of the jammer strategy of the intelligent jammer allows the power and timing of signal interference to be autonomously realized.Positive rate covert communication under basic model;(2)For the lack of monitoring node information,based on the random distribution model of the position of the monitor Willie,a concealed communication model of the self-interference receiver is further proposed,and the most common detection scheme is solved to design a concealed communication scheme.Positive rate covert communication at different Willie distribution strengths;(3)Aiming at the problem of tight spectrum resources and the existence of communication systems in existing frequency bands,based on the research framework of multi-antenna systems,a covert communication model for legitimate user cover under multi-antenna systems is proposed,that is,the source nodes of multi-antennas are used.Under the cover of the signals of existing communication users,through the allocation of power and the design of the vector,it is possible to achieve covert communication at a positive rate and increase the average rate of covert communication;and under the model,legal users and covert communication users are discussed.Respective connection probability and average speed of covert communication to ensure basic communication requirements for legitimate users;...