Effect of terahertz-wave phase noise and millimeter-wave multipath fading on Beyond 5G wireless system

Towards the Beyond 5G ultra-high-speed wireless system, the "vir tualized terminal" system is studied. By connecting a user terminal to multiple peripheral devices over terahertz radio wave (300 GHz) which are utilized as virtual antennae communicating with access points using mil-limeter radio wave, the spatial multiplexing capability is enhanced. In this system, the waveform is required to be robust against both phase noise from a terahertz-wave oscillator and multipath fading over the millimeter-wave since the baseband waveform is common to those frequencies. This work evalu-ates the effect of those factors and reveals that the effect of phase noise and multipath fading is dominant for OFDM and DFT-s-OFDM, respectively.