[Ground-station] LDPC decode benchmarking - two to test

[Michelle Thompson]

In between the GNU Radio Hackfest and Maker Faire, those of us there from
P4G talked a lot more about FPGAs.

We've previously discussed benchmarking Ahmet's LDPC codebase in order to
see if we can proceed with it on a general purpose processor.

As you all know, it's here:

https://github.com/xdsopl/LDPC

There's another open source LDPC decoder announced from SDR Makerspace
today.

https://gitlab.com/librespacefoundation/sdrmakerspace/ldpc_simd

Benchmarking results would go a long way towards simplifying the
architecture on the ground.

During the previous GPP-vs.-FPGA discussion, we agreed that they payload
will definitely need an FPGA. The recent polyphase filter bank work from
Theseus Cores is on deck for testing and configuration for our channelizing
needs.

More soon - a test plan and any existing benchmark results would be
helpful. If you're online and have a few minutes, see what you can find
that already exists and let's start keeping track in a table.

-Michelle W5NYV
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