Re: [Starlink] SpaceX/Starlink says it's ready for a fall satellite-to-cell service with T-Mobile

[Mike Puchol <mike@starlink.sx>]

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Yes, they correct doppler in a single stream - what I was alluding to is the MIMO advantage of terrestrial networks which cannot be easily replicated from multiple satellites, as the UE cannot correct multiple doppler shifts and timing advances unless it implements an NTN-specific approach.

Best,

Mike
On Jun 4, 2024 at 20:17 -0700, David Lang <david@lang.hm>, wrote:
> Mike Puchol wrote:
>
> > Something else that's much harder to implement is MIMO, as you don't get path
> > diversity from a satellite. AST claims they will do this by using more than
> > one satellite, however they haven't answered basic questions such as how will
> > the UE compensate the huge differences in doppler shift on top of the multiple
> > paths.
>
> for the starlink version, the satellite adjusts it's transmit/receive
> frequencies to correct for the doppler shift so that the phones don't need to.
>
> David Lang
>

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