联合多用户调度与友好干扰的功率资源分配优化研究

Power Resource Allocation Optimization Analysis of Joint Multiuser Scheduling and Friendly Jammer

物理层安全(Physical Layer Security,PLS)技术是一种利用无线信道固有物理属性来保护无线信道免受非法窃听的有效手段,受到了人们的广泛关注。因此,研究了联合多用户调度与友好干扰的功率资源分配优化问题,考虑存在信道估计误差以及多个窃听者通过协作方式获机密信息的情况,联合多用户调度策略与友好干扰选择,提出了联合多用户调度和随机干扰选择(Multiuser Scheduling and Random Jammer Selection,MS-RJS)方案和联合多用户调度和最佳干扰选择(Multiuser Scheduling and Optimal Jammer Selection,MS-OJS)方案,即选择最佳用户向基站传输机密信息的同时,选择友好干扰发射人工噪声降低窃听者的性能,并将传统多用户调度(Conventional Multiuser Scheduling,CMS)方案作为基准方案。对此,在通信系统总功率受限的情况下,以最小化所提方案的窃听概率和中断概率之和为目标,构建最佳用户与友好干扰之间的功率资源分配优化问题,并设计了一种基于黄金搜索的最佳功率分配迭代算法。实验结果表明,带有最佳功率分配因子的MS-RJS方案和MS-OJS方案相比于CMS方案具有显著的性能优势。

Physical Layer Security(PLS)is an effective means to protect wireless channels from illegal eavesdropping by exploiting inherent physical properties of wireless channels,and has received widespread attention.Therefore,the power resource allocation optimization of joint multiuser scheduling and friendly jammer is examined.Considering the existence of channel estimation errors and the cooperative acquisition of confidential information by multiple eavesdroppers,with the combination of the joint multiuser scheduling and friendly jammer,the joint Multiuser Scheduling and Random Jammer Selection(MS-RJS)scheme and the joint Multiuser Scheduling and Optimal Jammer Selection(MS-OJS)scheme are proposed,while the Conventional Multiuser Scheduling(CMS)scheme is considered as a benchmark.That is,while the optimal user transmits confidential information to the base station,friendly jammer emits artificial noise to reduce the eavesdropper s performance.Based on the closed-form analysis,under the constraint that the total power of the communication system,with the goal of minimizing the sum of the intercept probability and outage probability of the proposed schemes,an optimal power resource allocation problem between the optimal user and friendly jammer is formulated to further enhance the communication security of the network,and an optimal power allocation iterative algorithm based on the golden search is designed.Simulation results show that the MS-RJS scheme and MS-OJS scheme with optimal power allocation factor have significant performance advantages compared to the CMS scheme.