Analysis of the Chirality Effects on the Capacity of Wireless Communication Systems in the THz Band

The potentialities of the Terahertz (THz) frequency band in the context of nano-scale communications are increasing, thanks to specific features that allow issues related to the spectrum scarcity and capacity limitation to be overcome. Apart from high molecular absorption and very high reflection loss that represent the main phenomena in THz band, in this paper, we investigate the chirality effects that affect the propagation medium, in the frequency range (4 - 10) THz. It is observed that in this interval, the chiral parameter shows resonance peaks in specific frequencies. In this paper, we investigate the channel capacity in a special medium affected by chirality effects, such as biomolecules, DNA chains, and so on. Specifically, we analyze the signal propagation in a chiral medium where a giant optical activity (GOA) is present. This effect is typical of the so-called chiral-metamaterials. Through simulation results we distinguish the behavior of a chirality-affected channel with GOA in line-of-sight and non-line-of-sight propagations, assuming different power allocation techniques and also comparing the performance to the case of No GOA.