On Thu, Aug 16, 2018, 05:18 <[email protected]>
wrote:
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> Today's Topics:
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> 1. (Ab)using GNU radio to demodulate 4FSK signals as if they
> were QPSK (Adrian Musceac)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 15 Aug 2018 23:18:52 +0300
> From: Adrian Musceac <[email protected]>
> To: [email protected],
> [email protected]
> Subject: [Freetel-codec2] (Ab)using GNU radio to demodulate 4FSK
> signals as if they were QPSK
> Message-ID:
> <CA+yUT9_8-xonjnw_ZWc793+qJt_2ptXxbkBob54BP9_2PGJ=
> [email protected]>
> Content-Type: text/plain; charset="UTF-8"
>
> Hi all,
>
> I know there are fans of GNU radio on this list, for the sake of
> simplicity of writing DSP code which leaves room for those of us not
> as well versed in the trade to experiment with Codec2.
>
> I wrote a short blog article on how to abuse the GNU radio blocks to
> soft decode 4FSK as if it was a QPSK signal (accepting some
> trade-offs). I know this topic is well covered in books and internet
> articles, including David's blog, but I could not find this approach
> described anywhere else on the internet and since it seems a little
> outrageous at first, I thought I might publish this for the benefit of
> curious amateur radio people who like to experiment with Codec2 and
> digital voice in every possible way.
> Hopefully this is not seen as very offtopic here :)
>
> Article can be found at
> http://qradiolink.org/4fsk-viterbi-soft-symbol-decoding.html
>
> Best regards,
> Adrian
>
>
>
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