Forum: GNU Radio adding channel effects to an input in GNURADIO

356dfd3417bb998d945135e48409185a?d=identicon&s=25 Nasi Elda (nesazeri)
on 2014-05-11 23:42
(Received via mailing list)
Hi all,

(Ubuntu 13.04, GNURADIO 3.7)

I have a question regarding the channel models. As far I know the
channel function must be convolved (convolution) with the input to get
the output like this:

out = conv(in,channel)

In GNURADIO I can not find this convolution or any filter to do that. I
am looking inside this folder: gnuradio/gr-channels/lib.
How is this process done in GNURADIO?
B4ffbc711addde4c649b1ed526df6157?d=identicon&s=25 Martin Braun (Guest)
on 2014-05-12 09:55
(Received via mailing list)
On 11.05.2014 23:41, Nasi wrote:
> How is this process done in GNURADIO?
Nasi,

there's all kinds of filtes and channel models in GNU Radio. In GRC, you
can search for them; in the source tree, they'd be under gr-filter and
gr-channels, respectively. Also check the corresponding manual pages.

M
356dfd3417bb998d945135e48409185a?d=identicon&s=25 Nasi Elda (nesazeri)
on 2014-05-12 10:29
(Received via mailing list)
Channel models there do not use any filtering.
Isnt it like this?
I did not see any filtering in source files of channels.


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Montag, 12. Mai 2014 09:53 +0200 from Martin Braun
<martin.braun@ettus.com>:
On 11.05.2014 23:41, Nasi wrote:
> How is this process done in GNURADIO?
Nasi,

there's all kinds of filtes and channel models in GNU Radio. In GRC, you
can search for them; in the source tree, they'd be under gr-filter and
gr-channels, respectively. Also check the corresponding manual pages.

M
B4ffbc711addde4c649b1ed526df6157?d=identicon&s=25 Martin Braun (Guest)
on 2014-05-12 10:43
(Received via mailing list)
On 12.05.2014 10:28, Nasi wrote:
> Channel models there do not use any filtering.
> Isnt it like this?
> I did not see any filtering in source files of channels.

Filter == convolution == multipath channels.
See channel_model_impl.cc.

Cheers,
M
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