Deep Learning-Based Secure MIMO Communications with Imperfect CSI for Heterogeneous Networks.Perfect channel state information (CSI) is required in most of the classical physical-layer security techniques, while it is difficult to obtain the ideal CSI due to the time-varying wireless fading channel. 
Deep Learning-Based Secure MIMO Communications
With the help of deep convolutional neural networks (CNNs), the macro BS obtains the refined version from the imperfect CSI. 
CNNs
The results show that considerable performance gains can be obtained from the deep learning-based detectors compared with the classical maximum likelihood algorithm.
maximum likelihood algorithm