Re: [Discuss-gnuradio] Trying to build a DVB-S2 LDPC decoder

[Martin Braun]

Jose,

we have a *lot* of smart FEC stuff, including LDPC codes, in gr-fec. I
suggest you take a look there.

Cheers,
M

On 04/04/2016 04:41 PM, Jose Ruvalcaba wrote:
> Hello,
> 
> I am new to GNU radio and to SDR's and I am trying to implement a DVB-S2
> LDPC decoder block that can be used with the LDPC DVB-S2 encoder
> available in GNU radio. I have been able to write an LDPC decoder which
> uses a 16,200 long parity check matrix used only for a DVB-S2  short
> frame, rate = 1/4 code. The problem is that when running my written
> block it's taking a long time to decode one iteration of data(about an
> hour long). I was wondering if anyone has any advice in how to go about
> writing code for FEC blocks, especially LDPC codes, which will be used
> in GNU radio and eventually in an SDR? In other words, are there certain
> libraries that should be used when trying to write FEC decoders in gnu
> radio? How could I make a GNU radio FEC block which takes in a codeword
> length 16,200, like the one in DVB-s2, to work in a USRP? Is it smart to
> make my large (12960 x 16,200) parity check matrix using the standard
> 'vector' library in C++?   Any advice, tips and suggestions will be
> greatly appreciated.
> 
> Thanks,
> Jose
> 
> 
> 
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