Re: [Discuss-gnuradio] calc_metric in digital_constellation_receiver

[Ben Reynwar]

On Sun, Feb 24, 2013 at 6:36 AM, Manu T S <address@hidden> wrote:
> I want to use trellis codes along with generic_mod_demod.
>
> 1. Can I replace the constellation_receiver object with a trellis_metric
> followed by a viterbi? If so is it required to have an operation equivalent
> to phase correction in constellation_receiver? How can I do that?

constellation_receiver has four optional outputs.  The fourth is a
phase-corrected complex number.  You could use this as the input to
your metric calculation.

>
> 2. There is a function for metric calculation inside constellation_receiver.
> Can I use it to implement viterbi?

This function is called by trellis.constellation_metrics_cf which
generates metrics that you can feed into the viterbi block.  Metrics
are calculated for every constellation point, so for large
constellations the efficiency will be appalling.

>
> Thanks in advance
>
>
> --
> Manu T S
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>