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Re: [Discuss-gnuradio] calc_metric in digital_constellation_receiver
From: |
Ben Reynwar |
Subject: |
Re: [Discuss-gnuradio] calc_metric in digital_constellation_receiver |
Date: |
Sun, 24 Feb 2013 12:28:07 -0700 |
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
>
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