Electrical and Electronic Engineering; Computer Science Applications; Modeling and Simulation; Diversity combining; non-geostationary orbit; satellite communication systems; space-time block coding; time misalignment; zero-forcing
Résumé :
[en] Current trends in non-geostationary orbit (NGSO) satellite communications pose the challenge of attaining high spectral efficiency with low-complexity user terminals (UTs). In this context, this letter investigates the downlink/forward transmission of linear space-time block coded (STBC) signals through multiple geographically distributed NGSO satellites. As such, by combining the signals through multiple satellites, STBC provides a diversity advantage, which helps in combating the adverse effects of fading and interference at the UT. The main challenge of implementing
such a scheme is the lack of time synchronization and the interference effect through a multi-satellite system toward the UT. To address this issue, we propose a digital receiver structure with multiple branches specifically designed to lock onto each satellite of the multi-satellite system, thus providing a solution for simple
UT without requiring additional complexity in terms of radiofrequency components. Herein, we consider the zero-forcing (ZF) based diversity combining scheme while deriving the signal-to-interference-plus-noise ratio (SINR) expression at UT. Our results demonstrate the SINR improvement brought by the ZF combiner.
Disciplines :
Ingénierie aérospatiale
Auteur, co-auteur :
SINGH, Vibhum ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
EAPPEN, Geoffrey ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Martins, Wallace A. ; ISAE-SUPAERO, Université de Toulouse, France
Palisetty, Rakesh; Department of Electrical Engineering, Shiv Nadar Institution of Eminence Deemed to be University, Delhi NCR, India
MARCOS ROJAS, Carlos Luis ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
GONZALEZ RIOS, Jorge Luis ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
VASQUEZ-PERALVO, Juan Andres ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
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