[en] Simultaneously transmitting and reflecting reconfigurable intelligent surfaces (STAR-RIS) enhance the flexibility and performance of RIS by extending traditional 180◦ half-space coverage to a full 360◦. Motivated by this, we explore a STARRIS assisted overlay cognitive satellite-terrestrial network (OCSTN) with multiple users. In this setup, a primary satellite source communicates with terrestrial primary receivers (PRs) using nonorthogonal multiple access (NOMA), while a decode-and-forwardbased secondary transmitter (ST) facilitates primary communications in exchange for spectrum access. A STAR-RIS further aids the ST by simultaneously transmitting and reflecting superposed signals to enhance both primary and secondary communications.The analysis incorporates practical considerations, including imperfect successive interference cancellation (ipSIC) in the NOMA and overlay system, as well as quantization errors introduced by the discrete phase shifts of STAR-RIS elements. For terrestrial Nakagami-m fading and satellite shadowed-Rician fading, we derive exact and asymptotic outage probability expressions and ergodic rate bounds for primary and secondary networks. The numerical and simulation results demonstrate that the STAR-RIS-assisted OCSTN consistently achieves superior performance compared to standalone OCSTN benchmarks across key performance metrics.
Precision for document type :
Review article
Disciplines :
Electrical & electronics engineering
Author, co-author :
SINGH, Vibhum ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Solanki, Sourabh; National Institute of Technology Warangal, Department of ECE, India
Palisetty, Rakesh; Shiv Nadar Institution of Eminence, Deemed to be University, Department of Electrical Engineering, Delhi NCR, India
Rojas, Carlos Luis Marcos; University of Luxembourg, Interdisciplinary Centre for Security Reliability and Trust (SnT), Luxembourg City, Luxembourg
VASQUEZ-PERALVO, Juan Andres ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Merlano-Duncan, Juan Carlos; University of Luxembourg, Interdisciplinary Centre for Security Reliability and Trust (SnT), Luxembourg City, Luxembourg
CHATZINOTAS, Symeon ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Ottersten, Bjorn; University of Luxembourg, Interdisciplinary Centre for Security Reliability and Trust (SnT), Luxembourg City, Luxembourg
FNR16352790 - ARMMONY - Ground-based Distributed Beamforming Harmonization For The Integration Of Satellite And Terrestrial Networks., 2021 (01/06/2022-31/05/2025) - Juan Merlano Duncan
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