Performance Assessment of Hybrid Precoders in the Presence of Artificial Noise

The demands of users are gradually increasing with the passage of time and with the continuous evaluation in wireless communication technology (i.e., from first to fifth-generation (1G to 5G)). To acquire extreme capacity, extra-high data rates, massive connectivity, extremely low latency and energy consumption, the utilization of a suitable frequency band of the electromagnetic spectrum is inevitable. An appropriate solution is to utilize millimeter-waves (mmWaves) that can offer 200 times more bandwidth than the existing technology to meet the growing demands of applicants. However, these waves have certain degradation problems, which can be solved by deploying multiple-antenna technology owning to short wavelengths offered by mmWave bands. Still, security is one of the major problems associated with the mmWaves and has got a lot of attention from the researchers in recent times. The primary objectives of this study are to first present a secure hybrid precoder design in mmWave massive multiple-input multiple-output (MIMO) communication systems with the aid of artificial noise (AN), and then, compare the results with the most recent method in the literature. Extensive simulation studies confirm that the AN based hybrid precoder provides more secure communication than its counterpart in terms of secrecy rate versus signal-to-noise ratio (SNR).