[Ground-station] Now that we've heard some good news... LDPC block work needed - LDPC team alert

[Ron Economos]

Here's a 2 minute 46 second video showing the LDPC block in action with 
some very noisy QPSK. For that run, there were only 9 uncorrected bits 
out of 87,350,400.

File length is 116,752,397 bytes.

http://www.w6rz.net/ldpc.mp4

The repository is at:

https://github.com/drmpeg/gr-dvbldpc

Ron W6RZ

On 10/25/18 09:17, Michelle Thompson via Ground-Station wrote:
> Update: Ron W6RZ has a draft GNU Radio block in progress.
>
> Ahmet also has BCH code. As you all know, DVB-S2/X uses concatenated 
> LDPC-BCH forward error correction. We have spent some time talking 
> about and learning about LDPC, but BCH is in there too.
>
> -Michelle W5NYV
>
> On Wed, Oct 24, 2018 at 1:56 PM Ahmet Inan <xdsopl at gmail.com 
> <mailto:xdsopl at gmail.com>> wrote:
>
>     Fixed it on the master branch.
>
>     Ahmet
>     On Wed, Oct 24, 2018 at 10:21 PM Michelle Thompson
>     <mountain.michelle at gmail.com <mailto:mountain.michelle at gmail.com>>
>     wrote:
>     >
>     > Just keeping everyone in the loop:
>     >
>     > Ron reports that if we want Ubuntu 16.04 compatibility, then it
>     has to work with gcc 5.4. He says that specifically, std::clamp
>     isn't available.
>     >
>     > -Michelle W5NYV
>     >
>     > On Wed, Oct 24, 2018 at 5:23 AM Ahmet Inan <xdsopl at gmail.com
>     <mailto:xdsopl at gmail.com>> wrote:
>     >>
>     >> Yeah, I did the math last night to get soft information from BPSK,
>     >> QPSK and 8PSK modulation and it would be nice if someone could look
>     >> over it.
>     >> I am not entirely sure if I got the SNR stuff right but it
>     works very well.
>     >>
>     >> Also, please beware that my 8PSK is Pi/8 rotated.
>     >>
>     >> I put the new PSK stuff into the psk branch in order not to disturb
>     >> the others using the master tree:
>     >> https://github.com/xdsopl/LDPC/tree/psk
>     >>
>     >> Ahmet
>     >> On Wed, Oct 24, 2018 at 1:32 PM Michelle Thompson
>     >> <mountain.michelle at gmail.com
>     <mailto:mountain.michelle at gmail.com>> wrote:
>     >> >
>     >> > Thank you Ahmet.
>     >> >
>     >> > I believe your next goal is performance improvements with PSK?
>     >> >
>     >> > Is there anything that we can do to help out with this part?
>     >> >
>     >> > -mdt
>     >> >
>     >> > On Tue, Oct 23, 2018, 23:30 Ahmet Inan <xdsopl at gmail.com
>     <mailto:xdsopl at gmail.com>> wrote:
>     >> >>
>     >> >> Just fixed the few issues regarding g++ compatibility.
>     >> >> You can switch between clang++ and g++ in the Makefile.
>     >> >>
>     >> >> Ahmet
>     >> >> On Wed, Oct 24, 2018 at 8:17 AM Michelle Thompson via
>     Ground-Station
>     >> >> <ground-station at lists.openresearch.institute> wrote:
>     >> >> >
>     >> >> > Ron reports that the Clang dependency is problematic. A
>     conversion to gcc will/should be discussed.
>     >> >> >
>     >> >> >
>     >> >> >
>     >> >> > On Tue, Oct 23, 2018, 14:25 Michelle Thompson
>     <mountain.michelle at gmail.com <mailto:mountain.michelle at gmail.com>>
>     wrote:
>     >> >> >>
>     >> >> >> We heard some good news yesterday.
>     >> >> >>
>     >> >> >> But there is bad news!
>     >> >> >>
>     >> >> >> The bad news is that we aren't done yet, and have plenty
>     to do!
>     >> >> >>
>     >> >> >> I'm working on getting the DVB-S2/X code donation from
>     Aerospace Corporation (offered at the GRCon18 Block Party) into
>     the code base of GNU Radio. In the meantime, we have a recently
>     published open source LDPC repository that we should look at,
>     right now.
>     >> >> >>
>     >> >> >> https://github.com/xdsopl/LDPC
>     >> >> >>
>     >> >> >> This is written by Ahmet Inan, Co-founder & CEO aicodix
>     GmbH. They are located in Germany and is on our Slack.
>     >> >> >>
>     >> >> >> Recent bugs in this codebase have been sorted out. Can we
>     get this into a GNU Radio block and tested ASAP?
>     >> >> >>
>     >> >> >> There is at least one other potential code base from a
>     local LDPC expert, but it needs some work before release.
>     >> >> >>
>     >> >> >> Can we get something ready for review by this weekend?
>     >> >> >>
>     >> >> >> -Michelle W5NYV
>     >> >> >>
>     >> >> >>
>     >> >> >
>
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