Reliable Terabits Feeder Link for Very High-Throughput Satellite Systems with SAG-FSO Transmission

Ramy Samy, Hong Chuan Yang, Tamer Rakia, Mohamed Slim Alouini

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Very high-throughput satellite (VHTS) systems are attractive solutions for providing global connectivity and bridging the digital divide. These systems require feeder links with Terabit/s throughputs, which are challenging to achieve with conventional radio frequency (RF) transmissions. Free-space optical (FSO) transmissions, with huge license-free bandwidth, have emerged as a candidate solution for Terabit/s feeder links. Nevertheless, FSO transmissions are susceptible to the adverse impacts of atmospheric turbulence and weather conditions. To mitigate both atmospheric and weather effects, we first propose to combine space-air-ground (SAG) FSO transmission with site diversity. A high-altitude platform (HAP) FSO relay hovering directly above a ground station can successfully mitigate atmospheric turbulence impacts, while site diversity is an effective solution for addressing weather effects. To achieve a similar diversity benefit with reduced cost and lower complexity, we also propose a hybrid SAG-FSO/RF transmission system with multiple HAP relays. The proposed solution switches between HAPs depending on the ground-HAP channel quality. Numerical examples show the proposed feeder link solutions for VHTS systems can achieve a spectral efficiency of more than 3 bps/Hz while maintaining a bit error rate of 10−9 at a signal-to-noise ratio of 15 dB.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalIEEE Wireless Communications
StateAccepted/In press - 2023

Bibliographical note

Publisher Copyright:


  • Costs
  • Meteorology
  • Optical switches
  • Radio frequency
  • Relays
  • Reliability
  • Satellites

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering


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