In this paper, we investigate the secure beamforming design in multiple-input multiple-output (MIMO) nonorthogonal multiple access (NOMA) en-abled Internet of Things (IoT) networks, where a controller transmits confidential messages to multiple actuators and a cooperative controller acts as a jammer to prevent a potential eavesdropper from wiretapping the information. Our goal is to maximize achievable secrecy sum rate subject to the successful successive interference cancellation constraint and transmit power constraints of the controller and jammer. When channel state information (CSI) is perfect, we design the secure beamforming by developing an iterative optimization algorithm based on minimum mean square error (MMSE) method. When perfect CSI is not available, we model the channel errors as deterministically-bounded, and propose a robust secure beamforming design algorithm based on weighted MMSE and cutting-set method. The effectiveness of the proposed algorithms is verified by the simulation results.

在本文中，我们研究了启用多输入多输出（MIMO）非正交多址（NOMA）的物联网（IoT）网络中的安全波束成形设计，其中控制器将机密消息传输到多个执行器和一个协作控制器充当干扰者，以防止潜在的窃听者窃听信息。我们的目标是根据成功的连续干扰消除约束以及控制器和干扰器的发射功率约束，使可达到的保密总和率最大化。当信道状态信息（CSI）完美时，我们通过开发基于最小均方误差（MMSE）方法的迭代优化算法来设计安全波束成形。当没有完美的CSI时，我们会将通道错误建模为确定性有界，提出了一种基于加权MMSE和割集法的鲁棒安全波束成形设计算法。仿真结果验证了所提算法的有效性。