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文章针对存在非理想信道状态信息(CSI)的多输入单输出(MISO)网络,结合实际中存在的信道估计误差以及反馈时延等因素的影响,建立了非理想CSI的统一模型。在协同波束赋形和人工干扰方案下推导了安全速率、中断概率以及安全吞吐量等物理层安全性能的闭式表达式。在此基础上,进一步分析了高信噪比条件下的安全性能。理论分析和仿真结果表明:协同方案对CSI反馈时延更为敏感,且在高信噪比区间和无反馈时延时可获得较高的安全吞吐量。
Aiming at the multiple input and single output (MISO) networks with nonideal channel state information (CSI), a unified model of nonideal CSI is established based on the influence of channel estimation error and feedback delay in reality. The closed-form expression of physical layer security such as security rate, outage probability and secure throughput is deduced under cooperative beamforming and artificial interference schemes. On this basis, the safety performance under high signal-to-noise ratio is further analyzed. The theoretical analysis and simulation results show that the cooperative scheme is more sensitive to the CSI feedback delay and can obtain higher secure throughput in the high SNR range and without feedback delay.