能量收集安全传输系统中的在线功率控制算法  

An online power-control algorithm for energy harvesting and secure transmission systems

作　　者：雷维嘉[1] 王紫薇 Weijia LEI;Ziwei WANG(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院

出　　处：《中国科学：信息科学》2019年第10期1353-1368,共16页Scientia Sinica(Informationis)

基　　金：国家自然科学基金(批准号:61471076);重庆市基础研究与前沿探索项目(批准号:cstc2018jcyjAX0432,cstc2017jcyjAX0204)资助

摘　　要：针对能量收集无线通信系统信息安全传输过程中保密速率的优化问题,提出一种基于Lyapunov框架优化的在线功率控制策略.系统模型为无线衰落信道下的一发二收的保密通信模型,包含一个由能量收集设备供电的源节点和两个目的节点,两目的节点间的信息相互保密.每时隙源节点根据两目的节点的信道状态,选择向信道状态较好的目的节点传输保密信息,根据当前电池电量和信道状态在线设置发送功率和保密速率.将电池电量约束转换为虚队列,而将优化目标转换为惩罚,通过优化发送功率最小化瞬时队列漂移加惩罚函数,在满足约束条件的前提下最大化长期时间平均保密速率.优化过程中兼顾了两目的节点的传输公平性.仿真结果表明本文提出的方案能够高效地利用收集的能量,有效提高系统的长期时间平均保密速率.Here,we propose an online power-control strategy based on a Lyapunov optimization framework to optimize secrecy rate during the process of secure transmission in wireless communication systems with energy harvesting.We developed a system comprising one transmitter and two receivers that allow secure communication over a wireless fading channel.Additionally,this system includes an energy harvesting source node and two destination nodes that allow maintenance of information security between the two destination nodes.In each slot,the source node selects the destination node with the optimal channel state as the receiver of secret information,whereas the other destination node acts as an”eavesdropper.”Transmission power and the rate of information transfer are established according to current battery power and channel status,with constraints related to battery power converted into a virtual queue and the optimization target converted into a penalty.By optimizing the transmission power to minimize the instantaneous drift plus penalty function,the long-term average secrecy rate is maximized under the constraint condition.Furthermore,the transmission fairness of the two destination nodes is evaluated during the optimization process.Simulation results show that the proposed scheme effectively improved the long-term average secrecy rate of the system.

关 键 词：能量收集 物理层安全 保密传输 在线功率控制 LYAPUNOV 框架 

分 类 号：TN9[电子电信—信息与通信工程]