Research on Physical Layer Security of Communication System with NOMA and CR Technology
有关NOMA与CR技术的通信系统物理层安全问题研究

摘要

无线通信使用电磁波代替了传统线缆传输信息的方式，使得信息传输的效率得到了更进一步的提升。使用无线通信息传输载体，展现出光速自由、开放传播等特性。无线通信最显著的优势在于仅需借助电磁波就可以在短时间内传输信息，但与此同时也为窃听攻击创造了条件。无线通信的高速率、高容量、低时延的确带来了极大的便利，但与此同时更要考虑通信系统的安全性。物理层安全技术可以运用无线信道的自身衰落、噪声等特性，通过功率控制等技术阻隔窃听共计无法正确解码，进而使系统安全容量得到提升，更不需要设计复杂的加密、解密算法，因此使用物理层安全技术成为现阶段解决无线通信安全问题的关键手段与方式。非正交多址接入技术和认知无线电技术的功率控制均属于核心技术，在此基础上实现物理层安全技术是现阶段的重点研究内容之一。

Abstract

Wireless communication uses electromagnetic wave instead of the traditional cable transmission of information, so that the efficiency of information transmission has been further improved. Using wireless information transmission carrier, it shows the characteristics of free and open transmission at the speed of light. The most obvious advantage of wireless communication is that it can transmit information in a short time using only electromagnetic waves, but it also creates the conditions for eavesdropping attacks. The high rate, high capacity and low delay of wireless communication do bring great convenience, but at the same time, the security of communication system should be considered more. The physical security technology can use wireless channel fading and noise of features, through the power control technology such as blocking hacking total can't decode correctly, and then make the system safe capacity improved, more do not need to design complex encryption and decryption algorithm, therefore using the physical security technology become the key means and ways to solve the problem of wireless communication security. Non-orthogonal multiple access technology and power control of cognitive radio technology are both core technologies. The realization of physical layer security technology on this basis is one of the key research contents at present.