Adding channel effects to an input in GNURADIO

GNU Radio
1

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?

2

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

3

Channel models there do not use any filtering.
Isnt it like this?
I did not see any filtering in source files of channels.

Sent from Mail.Ru app for iOS

Montag, 12. Mai 2014 09:53 +0200 from Martin B.
[email protected]:
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

4

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