Physical and Link Layer Design for Ultra-broadband Terahertz Communications
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In the quest of higher wireless data-rates, Terahertz (THz)-band (0.1-10 THz) communication is envisioned as a key wireless technology of the next decade. THz Band communication will alleviate the spectrum scarcity and capacity limitations of current wireless systems, and enable new applications both in classical networking domains as well as in novel nanoscale communication paradigms. In this thesis, solutions are provided at the physical and link layers for the unique challenges presented by the THz Communication. First, an stochastic multipath channel model for THz band communication for bounded area applications is proposed, analyzed and validated using numerical simulation results. Second, a multiuser interference model for pulse-based THz Communication is proposed and validated with experimental results. Third, experimental and numerical results are provided to demonstrate that, contrary to the general sumption, an agile eavesdropper can intercept signals even at THz frequencies with very directional beams. Fourth, hierarchical bandwidth modulation that can cope with the distance-dependent bandwidth of the THz channel is proposed and shown to maximize the utilization of the distance-dependent bandwidth. Fifth, a link level synchronization and medium access control protocol for THz communication networks is proposed and and shown to outperform classical Aloha and two-way handhsake based protocols. Finally TeraSim, a THz network simulator that implements THz channel, physical and mac layer, is developed in ns-3.