Interference in satellite communication — Lesson 8

This lesson covers the concept of interference and its regulation by the International Telecommunication Union (ITU). It also explains the interference protection criteria. This lesson covers the C/N calculations in terms of dB for uplink and downlink parts and basic C/I calculation. The lesson concludes with a discussion on bandwidth adjustment factor and the need for coordination in case of interference.

Video Highlights

00:18 - Introduction and recap of previous lesson
03:10 - Possibility of interference in Geostationary operation
04:22 - Concept of interference coordination and the ITU regulation
06:20 - Interference Protection Criteria as per ITU
07:58 - Calculation of C/N in terms of dB for uplink and downlink parts
15:52 - Basic C/I calculation
24:11 - Bandwidth adjustment factor

Key Takeaways

- The total C/N0, which affects the quality required by the user, depends on various factors including the uplink power, downlink power, G/T of the satellite, and the ground station.
- Satellites operate in a nonlinear manner, particularly the power amplifier on the satellite.
- The concept of input back off and output back off is introduced to operate in the linear region and avoid harmful spurious.
- Interference in satellite communication needs to be regulated properly, with ITU providing the guidelines.
- In case of interference, there is a need for coordination and adjustment of factors like gain in the satellite, antenna pattern, or frequency band.