[Ground-station] Ground-Station Digest, Vol 20, Issue 1

[Thomas Parry]

Hi Michelle,

I would be super interested in being involved with this.

I think it's fairly straightforward to do this off the shelf:

USRP -> Low Power Filter -> Amplifier -> High Power Filter -> Antenna

Low Power Filter:
https://www.minicircuits.com/WebStore/dashboard.html?model=VLF-5500%2B
Amplifier:
https://www.minicircuits.com/WebStore/dashboard.html?model=ZHL-100W-63%2B
High Power Filter: TBC

However, where's the fun in that?  It would be much more interesting to
design it ourselves.  What is the Skyworks part you have been evaluating?

Also, would you be able to provide a link to the Gateway (LOP-G)
architecture and requirements please?

Cheers,
Thomas

On Tue, Nov 5, 2019 at 6:02 PM
<ground-station-request at lists.openresearch.institute> wrote:

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> Today's Topics:
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>    1. LDPC VHDL decoder review progress - need solid 5GHz RF
>       prototype by late summer 2020 (Michelle Thompson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 5 Nov 2019 08:06:14 -0800
> From: Michelle Thompson <mountain.michelle at gmail.com>
> To: Michelle Thompson via Ground-Station
>         <ground-station at lists.openresearch.institute>
> Subject: [Ground-station] LDPC VHDL decoder review progress - need
>         solid 5GHz RF prototype by late summer 2020
> Message-ID:
>         <CACvjz2Ui=dBAhMHM1x=
> 5w-0HRXCw+4x2f76bvL8qfmqAC+4PJA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> -=-=-=-=-=-=-=-= LDPC VHDL =-=-=-=-=-=-=-=-=-=-
>
> The LDPC VHDL decoder code review and video report is progressing fast.
> Draft video report shared on Slack. Codebase on github is here:
> https://github.com/aicodix/cnp
>
> Huge thanks to Ahmet for the codebase and the explanations. Current focus
> of Ahmet's work is the check node processor. Decoder organically growing
> out from there!
>
> -=-=-=-=-=-=-=-= 5GHz RF =-=-=-=-=-=-=-=-=-=-
>
> After three or so attempts to get a good prototype 5GHz transmit chain, we
> don't have one today. Skywave parts looked promising last year and we got
> some results in the lab.
>
> We need something that hooks up to something like the USRP x310 or
> equivalent, and provides enough power to close the link up to GEO.
>
> How much power is that? As much as we can get away with. Our link budgets
> have numbers up to 10W on 5GHz.
>
> Uplink signal is FDMA 4-ary minimum shift keying (modulation selected to
> keep the RFs happy).
>
> Forward error correction can obviously help. Re-using the work that we have
> going on for the receiver (BCH and LDPC) makes the most sense.
>
> Looking at the architecture and requirements for Gateway (LOP-G) LDPC
> occurs over and over again. I'm in favor of selecting something that is
> already specified in CCSDS/Gateway docs.
>
> So, bottom line - we need a solid open-source RF transmit design by late
> summer 2020.
>
> We have *plenty* of funding to buy parts and PCBs. We need a solid design.
> If you can help then step up and let's get this identified, designed,
> documented, built, tested, and ordered.
>
> We have 10MHz of uplink bandwidth to cover. We have channelization with 96
> channels as the baseline 2020 demonstration. This is about 100kHz per
> uplink channel.
>
> Is there something off the shelf that can work? Is this something a student
> can use for credit?
>
> -Michelle W5NYV
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