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Reconfigurable Intelligent Surfaces Empowered THz Communication in LEO Satellite Networks

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Document pages: 12 pages

Abstract: The revolution in the low Earth orbit (LEO) satellite networks will bringchanges to their communication models and a shift from the classical bent-pipearchitectures to more sophisticated networking platforms. Thanks totechnological advancements in microelectronics and micro-systems, the terahertz(THz) band has emerged as a strong candidate for inter-satellite links (ISLs)due to its promise of high data rates. Yet, the propagation conditions of theTHz band need to be properly modeled and controlled by utilizing reconfigurableintelligent surfaces (RISs) to leverage their full potential. In this work, wefirst provide an assessment of the use of the THz band for ISLs and quantifythe impact of misalignment fading on error performance. Then, in order tocompensate for the high path loss associated with high carrier frequencies, andto further improve the signal-to-noise ratio (SNR), we propose the use of RISsmounted on neighboring satellites to enable signal propagation. Based on amathematical analysis of the problem, we present the closed-form error rateexpressions for RIS-assisted ISLs with misalignment fading. Numerical resultsdemonstrate that the proposed RIS-empowered THz communication solution presentssignificant performance improvement with the use of RISs.

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