摘要
物联网(Internet of Things, IoT)的广泛应用使得设备使用量不断增加,随之而来的传输安全和能源消耗问题成为关注的重点。为实现绿色通信以及增强通信的安全性,提出了环境反向散射通信(Ambient Backscatter Communication, AmBC)辅助非正交多址接入(Non-Orthogonal Multiple Access, NOMA)系统的隐蔽通信传输方案,其中射频源通过直接链路和反射链路向隐蔽用户和公共用户发送信息。考虑了发射功率随机化来干扰射频源附近的监测者检测隐蔽通信行为。为了评估系统的性能,推导出监测者的最佳检测阈值和最小检测错误概率的闭式表达式;计算了用户的中断概率(Outage Probabilities, OPs)闭式解;提出了在满足隐蔽性和可靠性约束条件下最大化有效隐蔽率(Effective Covert Rate, ECR)的功率分配系数方案。仿真结果表明,通过优化功率分配系数,系统最大ECR存在并随发射功率的增大逐渐趋于定值。
The extensive application of the Internet of Things(IoT)has led to the increasing use of devices,and the ensuing problems of transmission security and energy consumption have become a major concern.In order to realize green communication as well as enhance the security of communication,an Ambient Backscatter Communication(AmBC)assisted Non-Orthogonal Multiple Access(NOMA)system for covert communication transmission scheme is proposed,in which the radio frequency source sends information to the covert user and the public user through direct and reflected links.In addition,transmit power randomization is considered to interfere with the detection of covert communication behavior by monitor near the radio frequency source.To evaluate the performance of the system,closed-form expressions for the optimal detection threshold and the minimum detection error probability of the monitor are first derived.The closed-form solution for the user s Outage Probabilities(OPs)is computed.A power allocation coefficient scheme is proposed to maximize the Effective Covert Rate(ECR)under the condition of satisfying the covertness and reliability constraints.Simulation results show that by optimizing the power allocation factors,the maximum ECR of the system exists and tends to a constant value gradually with the increase in transmit power.
作者
杜刘通
文富鹏
张硕
乔大伟
黄涂半特
DU Liutong;WEN Fupeng;ZHANG Shuo;QIAO Dawei;HUANG-TU Bante(Mobile Communication Innovation Center,China Academy of Information and Communication Technology,Beijing 100191,China;Beijing Institute of Computer Technology and Application,Beijing 100191,China;International Cooperation Department,China Branch BRICS Institute for Future Networks,Shenzhen 518045,China;School of Emergency Management,Henan Polytechnic University,Jiaozuo 454000,China;China Branch BRICS Institute for Future Networks,Shenzhen 518045,China)
出处
《无线电工程》
2024年第3期573-579,共7页
Radio Engineering
基金
河南省科技攻关项目(232102211073)。
