Over the last decade, many advancements have been made in the field of wireless communications. Among the major technology enablers being explored for the fifth-generation (5G) beyond 5G (B5G) networks at the physical layer (PHY), a great deal of attention has been focused on millimeter-wave (mmWave) communications, massive multiple-input multiple-output (MIMO) antenna systems and beamforming techniques. These enablers bring to the forefront great opportunities for enhancing the performance of B5G networks, concerning spectral efficiency, energy efficiency, latency, and reliability. The wireless communication is prone to information leakage to the unintended nodes due to its open nature. Hence, the secure communication is becoming more critical in the wireless networks. To address this challenge, the concept of Physical Layer Security (PLS) is explored in the literature. In this paper, we examine the mmWave transmission through linear beamforming techniques for PLS based systems. We propose the secure multiuser (MU) MIMO mmWave communications by employing hybrid beamforming at the base stations (BS), legitimate users and eavesdroppers. Using three Dimensional (3D) mmWave channel model for each node, we utilize the artificial noise (AN) beamforming to jam the channels of eavesdropper and to enhance the secrecy rate. The secrecy performance on multicell mmWave MU-MIMO downlink communications is demonstrated to reveal the key points directly related to the system security for B5G wireless systems.

在过去的十年中，无线通信领域取得了许多进步。在物理层（PHY）上为超越5G（B5G）网络的第五代（5G）探索的主要技术支持者中，大量注意力集中在毫米波（mmWave）通信，大规模多输入上多输出（MIMO）天线系统和波束成形技术。这些促成因素在频谱效率，能效，时延和可靠性方面为提升B5G网络的性能带来了巨大的机遇。无线通信由于其开放性而易于将信息泄漏到意外节点。因此，安全通信在无线网络中变得越来越重要。为了应对这一挑战，文献中探讨了物理层安全性（PLS）的概念。在本文中，我们研究了基于PLS的系统通过线性波束形成技术的mmWave传输。通过在基站（BS），合法用户和窃听者处采用混合波束成形，我们提出了安全多用户（MU）MIMO mmWave通信。对每个节点使用三维（3D）mmWave通道模型，我们利用人工噪声（AN）波束成形来堵塞窃听者的通道并提高保密率。演示了多小区mmWave MU-MIMO下行链路通信的保密性能，以揭示与B5G无线系统的系统安全性直接相关的关键点。通过在基站（BS），合法用户和窃听者处采用混合波束成形，我们提出了安全多用户（MU）MIMO mmWave通信。对每个节点使用三维（3D）mmWave通道模型，我们利用人工噪声（AN）波束成形来堵塞窃听者的通道并提高保密率。演示了多小区mmWave MU-MIMO下行链路通信的保密性能，以揭示与B5G无线系统的系统安全性直接相关的关键点。通过在基站（BS），合法用户和窃听者处采用混合波束成形，我们提出了安全多用户（MU）MIMO mmWave通信。对每个节点使用三维（3D）mmWave通道模型，我们利用人工噪声（AN）波束成形来堵塞窃听者的通道并提高保密率。演示了多小区mmWave MU-MIMO下行链路通信的保密性能，以揭示与B5G无线系统的系统安全性直接相关的关键点。