DPP for THz Massive MIMO in Future Wireless networks

Abstract

Terahertz (THz) communication is developing into an important technology for next 6G networks owing towards the ultra-wide bandwidth it provides. Precoding is a crucial approach in THz communication to get around the THz signals’ severe path loss and support the needed coverage. The primary problems of the prevalent THz precoding approaches for upcoming 6G networks are carefully investigated in this research. To be more precise, we first show how the main distinctions between millimeter-wave and THz channels are made clear. From there, we highlight the main difficulties with THz precoding, including the beam split effect and high power consumption.In THz massive MIMO systems, where the directional beams will split into several substantial directions at different sub-carrier frequencies, recent hybrid precoding approaches relying on frequency-independent phase-shifters are unable to handle the beam split effect. In THz mMIMO systems, the beam split effect will cause a significant array gain loss across the whole bandwidth, which has not been thoroughly studied.As a result, delay-phase precoding and hybrid precoding are suggested in this work. Then, after carefully examining its range of time delayers and antenna elements and making a association with frequency (milli meter wave and SubTHz have been examined), we move on to its design. The suggested delay-phase precoding approaches outperform the other wideband and narrowband precoding techniques already in use. To compare these typical THz precoding techniques and draw some conclusions for their usage in upcoming 6G networks, present simulation results of spectral efficiency.