Reconfigurable Intelligent Surface Aided TeraHertz Communications Under Misalignment and Hardware Impairments

by   Hongyang Du, et al.

TeraHertz (THz) communications are envisioned to help satisfy the ever high data rates demand with massive bandwidth in the future wireless communication systems. However, severe path attenuation, transceiver antenna misalignment, and hardware imperfection greatly alleviate the performance of THz communications. To solve this challenge, we utilize the recently proposed reconfigurable intelligent surface (RIS) technology and provide a comprehensive analytical framework of RIS-aided THz communications. More specifically, we first prove that the small-scale amplitude fading of THz signals can be exactly modeled by the fluctuating two-ray distribution based on recent measurements. Exact statistical characterizations of end-to-end signal-to-noise plus distortion ratio (SNDR) and signal-to-noise ratio (SNR) are derived. Moreover, we propose a novel method of optimizing the phase-shifts at the RIS elements under discrete phase constraints. Finally, we derive analytical expressions for the outage probability and ergodic capacity, respectively. The tight upper bounds of ergodic capacity for both ideal and non-ideal radio frequency chains are obtained. We provided Monte-Carlo simulations to validate the accuracy of our results. It is interesting to find that the impact of path loss is more pronounced compared to others, and increasing the number of elements at the RIS can significantly improve the THz communication system performance.


page 1

page 2

page 3

page 4


Millimeter Wave Communications With Reconfigurable Intelligent Surface: Performance Analysis and Optimization

Reconfigurable Intelligent Surface (RIS) can create favorable multipath ...

Physical Layer Security Enhancement with Reconfigurable Intelligent Surface-Aided Networks

Reconfigurable intelligent surface (RIS)-assisted wireless communication...

Optimum Reconfigurable Intelligent Surface Selection for Indoor and Outdoor Communications

The reconfigurable intelligent surface (RIS) is a promising technology t...

Capacity Degradation with Modeling Hardware Impairment in Large Intelligent Surface

In this paper, we consider capacity degradations stemming from potential...

Average Rate Analysis of RIS-aided Short Packet Communication in URLLC Systems

In this paper, the average achievable rate of a re-configurable intellig...

A Comprehensive Study of Reconfigurable Intelligent Surfaces in Generalized Fading

Leveraging on the reconfigurable intelligent surface (RIS) paradigm for ...

Average Rate and Error Probability Analysis in Short Packet Communications over RIS-aided URLLC Systems

In this paper, the average achievable rate and error probability of a re...

Please sign up or login with your details

Forgot password? Click here to reset