[Starlink] Starlink "beam spread"

[David Lang]

On Tue, 30 Aug 2022, Mike Puchol via Starlink wrote:

> • Multiple beams over a single cell: up to eight spot beams can be projected 
> onto a single cell without running into EPFD limits, as long as each one uses 
> one of the eight frequencies available. These simultaneous beams could come 
> from one or more satellites. This is how you can get additional capacity to a 
> cell, for example, to compensate for reduction by TDM. Two beams at 50% duty 
> cycle make up for one full beam. The advantage is spatial diversity, where a 
> terminal that has one satellite obstructed could opt from a beam from a 
> different, non-obstructed satellite.

you can also have multiple beams per cell by talking to satellites that are 
sufficiently far apart that the ground station can form it's beam to hit one 
satellite without interfering with the other. The groudn receivers that are 
listening to multiple satellites on the same frequency will have a higher noise 
level, but can still use beam forming to hear one more efficiently than another.

lower altitude satelites also reduce the cell size (improving frequency re-use), 
and Starlink is intending to start putting up sats (340Km vs the current 550Km)

The Starlink V2 satllites are also significantly larger, with more and larger 
antennas, which translates into more beams, and tighter beams.

David Lang
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