基于数字网络编码和人工噪声的NOMA安全通信方案

Secure communication scheme for digital network coding and artificial noise based on NOMA network

摘要

在非正交多址接入(Non-orthogonal multiple access,NOMA )网络中,传统的无人工噪声方案和现有的人工噪声方案不能同时保证近用户和远用户的安全性。针对此问题,提出了基于数字网络编码和人工噪声的NOMA安全通信方案,该方案通过一次一密的安全通信方式提升NOMA网络的安全可靠折中性能。具体来说,以人工噪声为密钥,并通过数字网络编码的方式对保密信息进行加密,进而实现安全通信。此外,理论推导了提出的安全通信方案的中断概率、窃听概率以及中断概率和窃听概率的渐进表达式。数值结果表明,相比现有的无人工噪声方案和传统的人工噪声方案,所提的安全方案可同时提升近用户和远用户的安全可靠折中性能。

Abstract

In the non-orthogonal multiple access (NOMA) network,the traditional non-artificial noise schemes and the existing artificial-noise schemes fail to simultaneously guarantee the secrecy for near user and far user.To address this issue,the proposed secure scheme based on one-time pad which jointly uses artificial noise and digital network coding to enhance security-reliability tradeoff (SRT) for NOMA network.Specifically,artificial noise is resorted to encrypt confidential message by network coding to achieve secure communication.Additionally,the closed-form expressions of outage and intercept probabilities are derived and an asymptotic analysis of outage and intercept probabilities is carried out.Numerical results show that the proposed secure scheme achieves better SRT performance for all NOMA users than the existing non-artificial noise scheme and the conventional artificial noise scheme.

关键词

物理层安全 / 天线选择 / 人工噪声 / 非正交多址接入

Key words

physical layer security / antenna selection / artificial noise / non-orthogonal multiple access

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基金资助

国家自然科学基金项目(62401298,62301280,62361010);江苏省自然科学基金项目(BK20240944);江苏省高等学校基础科学(自然科学)研究面上项目(24KJB510038,23KJB510021);南通市自然科学基金项目(JC2023024);南京邮电大学人才招聘自然科学研究启动基金项目(NY222007)