When THz-NOMA Meets Holographic Reconfigurable Intelligent Surfaces

In this letter, we investigate the performance of holographic reconfigurable intelligent surfaces (HRISs)-assisted terahertz-non orthogonal multiple access (THz-NOMA) wireless systems. We firstly present a system setup that takes into account the unique features of HRISs, NOMA and THz transmission a...

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Bibliographic Details
Published in:IEEE communications letters 2023-09, Vol.27 (9), p.1-1
Main Authors: Chrysologou, Athanasios P., Boulogeorgos, Alexandros-Apostolos A., Chatzidiamantis, Nestor D.
Format: Article
Language:English
Subjects:
Antennas
beam misalignment
Error analysis
holographic reconfigurable intelligent surfaces
Holography
Human-robot interaction
Interference
Misalignment
NOMA
non-orthogonal multiple access
Nonorthogonal multiple access
outage probability
Propagation losses
Reconfigurable intelligent surfaces
Signal to noise ratio
Terahertz
Wireless communication
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Summary:In this letter, we investigate the performance of holographic reconfigurable intelligent surfaces (HRISs)-assisted terahertz-non orthogonal multiple access (THz-NOMA) wireless systems. We firstly present a system setup that takes into account the unique features of HRISs, NOMA and THz transmission and then, considering the highly directional nature of THz beams, we derive analytical closed-form expressions for user equipments' (UEs') outage probabilities (OPs) under the unavoidable misalignment errors for both perfect successive interference cancellation (pSIC) and the more realistic case of imperfect successive interference cancellation (ipSIC). Furthermore, useful insights for the high signal-to-noise ratio are provided by deriving asymptotic expressions for UEs' OPs as well as by evaluating UEs' diversity orders. Numerical results confirm the validity of the presented analysis, illustrate that the presented NOMA approach outperforms orthogonal multiple access-based approaches as well as reveal the detrimental impact of misalignment at the performance of HRISs-assisted THz-NOMA systems.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2023.3293608