, a signal can travel from the transmitter to the receiver over multiple paths. This phenomenon is referred to as multipath propagation where signal attenuation varies on different paths. This effect also known as multipath fading can cause stochastic fluctuations in the received signal's magnitude, phase, and angle of arrival (AoA). The propagation over different paths is caused by scattering, reflection, diffraction, and refraction of the radio waves by static and moving objects as well as the transmission medium. It is obvious that different propagation mechanisms result in different channel and path loss models. As a result of wave propagation over multipath fading channels, the radio signal is attenuated due to mean path loss as well as macroscopic and microscopic fading. A detailed channel model for the frequency range (FR) from 6 to 100 GHz was developed in 3GPP [24]. It is applicable to bandwidth up to 10% of the carrier frequency (with a limit of 2 GHz), which accounts for the mobility of one of the two terminals (i.e., in a typical cel- lular network, the base station is fixed and the user terminal moves). It further provides sev- eral optional features that can be plugged in to the basic model, in order to simulate spatial consistency (i.e., the radio environment conditions of nearby users are correlated), blockage, and oxygen absorption. This model supports different IMT-2020 test environments includ- ing urban microcell (UMi), urban macrocell (UMa), rural macrocell (RMa), indoor hotspot (InH), and outdoor to indoor, which must be chosen when setting the simulation parameters [4,5,8,24,25]. 3.1.1.1 Path Loss Models In ideal free-space propagation model, the attenuation of RF signal energy between the transmitter and receiver follows inverse-square law. The received power expressed as a function of the transmitted power is attenuated proportional to the inverse of Ls(d), which is called free-space path loss. When the receiving antenna is isotropic, the received signal power can be expressed as follows 