“…LOS MIMO is particularly valuable in the mmWave and THz frequencies, where the wavelength λ is small and hence the Rayleigh distance -which sets the maximum range of such systems -is large. Indeed, there have been several demonstrations in the mmWave spectrum [5], and, with the advancement of communication systems in the THz and sub-THz bands [6], there has been growing interest in high-rank LOS MIMO in higher frequencies as well [7] -see, for example, some recent work at 140 GHz [8], [9].…”