摘要：

在多下行链路网络中,非正交信道之间的相互干扰与恶意干扰噪声使目的节点无法满足服务质量(QoS)要求。为此,提出一种安全传输方法,采用零和博弈模型求解该物理层安全问题,设计基于安全速率的效用函数,利用上下行链路对偶性优化下行链路的波束成型和功率分配, 最小化信息发送功率并满足目的节点处的QoS要求,求出混合策略均衡及对应的安全速率。仿真结果表明,该方法能获得较高的系统安全速率。

关键词: 非正交信道, 物理层安全, 零和博弈, 波束成型, 功率分配, 混合策略均衡

Abstract:

In the Multi-downlink network,the interference among nonorthogonal channels and the malicious interference makes destination nodes not meet the demand of Quality of Service(QoS).So a security transmission method based on zero-sum game model is proposed to solve this physical layer security problem.Utility function based on secrecy rate is built,and the downlink beamforming and power allocation are optimized jointly based on uplink downlink duality to minimize the transmission power and to meet the QoS.The mixed strategy equilibrium and the corresponding secrecy rate can be obtained.Simulation results show that this method can achieve a good secrecy rate.

Key words: nonorthogonal channel, physical layer security, zero-sum game, beamforming, power allocation, mixed strategy equilibrium

中图分类号: 

• TP393