SNR Optimization for LEO Satellite at sub-THz Frequencies

Rajnish Kumar, Shlomi Arnon

Research output: Contribution to journalArticlepeer-review

Abstract

The next generation of satellite constellations would include LEO satellites with communication link above 100 GHz in order to achieve higher efficiency and capacity of the satellite networks due to large available bandwidth. The LEO satellites require tracking by the ground station receiver, however due to the complexity, inefficiency, and nonlinearity of the phase shifters at THz frequencies, the conventional concept of scanning phased array antenna is less recommended. In this work, we derive an optimization algorithm for an electronically switchable subarrays of phased array at the ground station that maximize the SNR depending on the range of elevation angles of satellite. The algorithm optimizes the SNR by adapting the inter-element spacing between array elements considering the impact of molecular absorption loss and noise, thermal noise from the sky and the ground. In comparison to uniform phased array design with equal spacing, the SNR can be improved for a typical scenario by about 3 dB and thus improving the link performance. To the best knowledge of the authors, this LEO satellite communication algorithm at the sub-THz frequencies is for the first time to be published.

Original languageEnglish
JournalIEEE Transactions on Antennas and Propagation
DOIs
StateAccepted/In press - 1 Jan 2022

Keywords

  • Absorption
  • Antenna arrays
  • Attenuation
  • LEO satellite
  • Low earth orbit satellites
  • Molecular absorption noise
  • Phased array antenna
  • Phased arrays
  • SNR optimization
  • Satellites
  • Signal to noise ratio
  • THz frequency

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