Re: [Discuss-gnuradio] Punctured viterbi decoder?

[Dan CaJacob]

Try the gr-fec blocks - specifically the Extended En/Decoders.  The CCSDS27 blocks are fine, but they're older and for a specific set of polys.

On Mon, Mar 20, 2017 at 11:57 AM Ron Economos <address@hidden> wrote:

In the "Error Coding" category of GNU Radio Companion, there are
Puncture and Depuncture blocks.

Here are some example parameters that work for DVB-S.

1/2 code rate = Puncture Size = 2, Puncture Pattern = 0b11
2/3 code rate = Puncture Size = 4, Puncture Pattern = 0b1101
3/4 code rate = Puncture Size = 6, Puncture Pattern = 0b110110
5/6 code rate = Puncture Size = 10, Puncture Pattern = 0b1101100110
7/8 code rate = Puncture Size = 14, Puncture Pattern = 0b11010101100110

Ron

On 03/20/2017 08:40 AM, Booth wrote:
> Dear All,
> I've been playing with the CCSDS27 viterbi decoder block which supports 1/2
> rate. However we also need punctured codes like 3/4, 5/6, 7/8. Which block
> should we use. Any recommendations?
>
>

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--

Very Respectfully,

Dan CaJacob