Hi Marcin,
well, that flow graph only serves the purpose of pre-modulating things, e.g. for preamble
correlation, I'd speculate that's for when you want to e.g. simulate a channel impulse
response, or some external band-limiting filtering on your already pulse-shaped signal.
However, you're right, neither in the GRC examples nor in any test cases we have do we
make use of that taps vector (other than `[1]` as the perfect channel).
Cheers,
Marcus
On 04.08.22 09:43, Marcin Puchlik via GNU Radio, the Free & Open-Source Toolkit for
Software Radio wrote:
Hello Community,
Recently I investigated Modulate Vector
<https://wiki.gnuradio.org/index.php?title=Modulate_Vector> block and my observations are
that this block has two filtering stages - firstly in the modulator (RRC filter) and
secondly in itself (user providing the filter taps). The simple scheme of operation looks
like in the below picture.
So the question is: what is the purpose of the filter in modulate_vector_bc
<https://github.com/gnuradio/gnuradio/blob/master/gr-digital/lib/modulate_vector.cc> function?
Is this a bug or is there a reason for this?
Modulate vector question.png
--
BR,
Marcin Puchlik____
