LEO Satellite Networks: Brief Introduction to Communications Challenges

An overview of the main challenges in designing Low Earth Orbit (LEO) satellite communication networks.
Check out my search for signals in everyday life, by following my social media feeds:
Facebook: profile.php?...
Instagram: / iainexplains
Related videos: (see iaincollings.com)
• What are Doppler Shift, Doppler Spread, and Doppler Spectrum? • What are Doppler Shift...
• How does OFDM Overcome ISI? • How does OFDM Overcome...
• What is OTFS? Orthogonal Time Frequency Space Modulation • What is OTFS? Orthogon...
• Mobile Standards Evolution: FDMA, TDMA, CDMA, OFDMA • Mobile Standards Evolu...
• What is SC-FDMA? And why is it used for the Uplink of 4G/5G Mobile? • What is SC-FDMA? And w...
• Modelling mmWave MIMO Channels • Modelling mmWave MIMO ...
For a full categorised list of videos and Summary Sheets: www.iaincollings.com

[@davidodes]

Thank you for this. I enjoyed the breakdown.

[@iain_explains]

Glad you enjoyed it!

[@luyombojonathan6688]

Thanx alot for this channel !!! I enjoyed the break down 👍

[@iain_explains]

Glad you enjoyed it!

[@dineshjakhar2070]

Very informative. Thank you.

[@iain_explains]

You are welcome!

[@tankingblitz]

First comment and the most awaited series yay

[@iain_explains]

😁

[@mgx9383]

Thank you.

[@iain_explains]

You're welcome!

[@willhenry1007]

I have a question. Will there ever be a time that there is not a satellite above you and you might have to wait 20 minutes?

[@user-tm5jm7re7v]

Hello,I want to konw when in Rician,its LOS multiply NLOS is?HOW to use matrix to express Rician fading channel?Thank you very much

[@iain_explains]

These videos might help: "What is Rician Fading?" kzbin.info/www/bejne/h5rWk4xpbM2qnqs and "Rayleigh v Rician Fading: Which is better?" kzbin.info/www/bejne/gYKzc6p-prmcadU

[@heathjones1980]

Just a question on the beam steering.. Imagine a scenario where you have a single satellite and a bunch of subscribers all pointing to that satellite. The satellite uses beam steering. At any point a subscriber can receive a burst from the satellite as they always pointing in the right direction, but on the satellite RX side (burst from the subscriber), you will need to have the beam steered towards that subscriber. So that's where the time slot comes in. But extrapolate this out to multiple satellites with different relative velocities - do you run into synchronisation and timing issues due to relative clock drifts? What even constitutes the clock and a time slot in this scenario? Thanks for another awesome video by the way!

[@iain_explains]

Yes! I'm not an expert on timing recovery, but there are definitely clock synchronisation challenges over these long transmission distances with multiple users. In many cases timing is referenced to signals from GPS satellites.

[@melvinp1324]

@@iain_explains gps satelites lol more like ground stations

[@ahmednor5806]

🙏🙏💐💐💐

[@deplorablesecuritydevices]

How do you know all of this?? Amaizing explanations thank you!

[@iain_explains]

I'm so glad to hear that you liked the video. I've currently got a research project on LEO satellite communications, so I thought I'd share some of the fundamental concepts.

[@deplorablesecuritydevices]

Thank you so much I have an interview at Starlink monday and have been binge watching ALL of your content! The laplace explanation was my favorite. Thank you again!

[@iain_explains]

Great. I hope your interview went well.

[@melvinp1324]

rotate around the eart pmsl - do you mean the Glaeson jet streams

[@iain_explains]

Satellites are at much higher altitudes than the jet streams.

[@melvinp1324]

@@iain_explains how far do helium balloons go up