基于大规模MIMO技术的中继协作物理层安全研究

Research on relay-based physical layer security based on massive MIMO

传统无线通信的安全依靠上层加密,无法保护物理层的安全。为了克服传统无线通信系统加密的不足,采用人工噪声(Artificial Noise)生成和随机预编码器来研究中继协作下大规模多输入多输出(MIMO)下行链路系统的安全传输方法。针对估计的信道状态信息推导出和速率表达式,分析得出用户节点上的保密率。针对基站处的最小均方误差预编码器(MMSE)和迫零(ZF)预编码器,分析对比其性能差距。理论分析和仿真结果表明,该方法可以为大规模MIMO中继系统设计安全的物理层传输策略,且MMSE预编码器比ZF预编码器表现出更好的保密性能。

The security of traditional wireless communication relies on upper layer encryption and cannot protect the security of the physical layer. In order to overcome the shortcomings of traditional wireless communication system encryption, artificial noise generation and random precoder are used to study the secure transmission method of large-scale multiple input multiple output( MIMO)downlink system under relay cooperation. The estimated channel state information is derived and the rate expression is derived, and then the confidentiality rate on the user node is analyzed. The performance gap is analyzed and compared for the minimum mean square error precoder(MMSE) and zero forcing(ZF) precoder at the base station. Theoretical analysis and simulation results show that this method can design a secure physical layer transmission strategy for large-scale MIMO relay systems, and the MMSE precoder exhibits better security performance than the ZF precoder.