Abstract
This paper presents a connectivity analysis of reconfigurable intelligent surface (RIS) assisted terahertz (THz) wireless systems. Specifically, a system model that accommodates the particularities of THz band links as well as the characteristics of the RIS is reported, accompanied by a novel general end-to-end (e2e) channel attenuation formula. Based on this formula, we derive a closed-form expression that returns the optimal phase shifting of each reflection unit (RU) of the RIS. Moreover, we provide a tractable e2e channel coefficient approximation that is suitable for analyzing the RIS-assisted THz wireless system performance. Building upon the aforementioned approximation as well as the assumption that the user equipments are located in random positions within a circular cluster, we present the theoretical framework that quantifies the coverage performance of the system under investigation. In more detail, we deliver a novel closed-form expression for the coverage probability that reveals that there exists a minimum transmission power that guarantees 100% coverage probability. Both the derived channel model as well as the coverage probability are validated through extensive simulations and reveal the importance of taking into account both the THz channel particularities and the RIS characteristics, when assessing the system's performance and designing RIS-assisted THz wireless systems.
Highlights
According to the international telecommunication union (ITU), the global mobile traffic is expected to continue its exponential growth, reaching 5 zettabytes per month by 2020 [1]
This contribution presented a theoretical framework for RISassisted THz wireless system coverage performance evaluation
We described the system model and we employed electromagnetic theory tools in order to extract a generalized formula for the e2e path-gain
Summary
According to the international telecommunication union (ITU), the global mobile traffic is expected to continue its exponential growth, reaching 5 zettabytes per month by 2020 [1]. Building upon this model, we present a comprehensive system model for RIS-assisted THz wireless systems that support broadcasting and we conduct coverage analysis that reveals their limitations. The contribution of this paprerWiseapsrfoovlildoewas:system model for RIS-assisted THz wireless communications and we employ electromagnetic theory tools to derive a general expression for the end-toend (e2e) channel attenuation This expression takes into account the access point (AP)-RIS and RIS-user equipment (UE) distances, and the RIS size, the radiation pattern and the reflection coefficient of the RIS unit cell, the AP and UE antenna gain, the transmission frequency, as well as the environmental conditions. Both [55] and [56] refer to low frequency band communications; they neglect the impact of molecular absorption loss
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