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<body><div dir="auto">Curious, is that doppler correction applied individually per dishy, or per cell? If the latter do cells extend ahead or behind the satellite's projection onto the globe, or is there one or more beams ahead an another one or more behind?</div><br><br><div class="gmail_quote"><div dir="auto">On 5 June 2024 06:16:02 CEST, Mike Puchol via Starlink <starlink@lists.bufferbloat.net> wrote:</div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<div dir="auto"><span style="font-family:Arial">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.</span></div>
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Best,<br>
<br>
Mike</div>
<div name="messageReplySection">On Jun 4, 2024 at 20:17 -0700, David Lang <david@lang.hm>, wrote:<br>
<blockquote type="cite" style="border-left-color: grey; border-left-width: thin; border-left-style: solid; margin: 5px 5px;padding-left: 10px;">Mike Puchol wrote:<br>
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<blockquote type="cite">Something else that's much harder to implement is MIMO, as you don't get path<br>
diversity from a satellite. AST claims they will do this by using more than<br>
one satellite, however they haven't answered basic questions such as how will<br>
the UE compensate the huge differences in doppler shift on top of the multiple<br>
paths.<br></blockquote>
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for the starlink version, the satellite adjusts it's transmit/receive<br>
frequencies to correct for the doppler shift so that the phones don't need to.<br>
<br>
David Lang<br>
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</blockquote></div><div dir="auto"><div class='k9mail-signature'>-- <br>Sent from my Android device with K-9 Mail. Please excuse my brevity.</div></div></body>
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