Hi Nasi, when I checked the fading models supplied in GNU Radio 3.7 the other week they seemed to be generating nasty glitches in their output. You could instead take a look at 'my' custom block for doing simple single path configurable doppler Rayleigh fading. The output of this has been statistically validated against the theoretical Rayleigh distribution. I can provide further details of the validations that have been done if required. There is a version of the block for both GNURadio 3.6 and 3.7 API's. This block works fine when instantiated singly, however if you try and build a multipath fading model out of it by instantiating more than one of these blocks (with delays) at the python level then the whole thing tends to seg fault, for as yet undetermined reasons.
You are welcome to give it a try however. Here is the link to the GNU Radio 3.7 version of the block, https://github.com/hawk2050/gr-rccBlocks Feedback welcome Cheers Richard On 3 March 2014 06:25, Nasi <nesaz...@mail.ru> wrote: > Martin, > > it is so simple, I try to explain again: > > my question is how you add Doppler to the channel (the code)? > > Different people add it in a different way like using FIR or IIR filters. > So, I am wondering if you used IIR filter or FIR. If you know of course, > how you coded it? > > > > Воскресенье, 2 марта 2014, 15:26 +01:00 от Martin Braun < > martin.br...@ettus.com>: > > On 03/01/2014 04:35 PM, Nasi wrote: > > Helo all, > > > > I need your help for simulation of the Rayleigh fading. > > I know that I can use GNURADIO channel models, but I need to know how > > they simulated. > > For example I am looking into the 'fading_model_impl.cc' in channel > > models of GNURADIO. > > Can someone tell me how this is simulated? > > Can you specify what you want to do? I don't understand the question. > If you connect this block to your signal, it will "simulate" the channel. > > > I heard some people also developed it on their own, but I am not sure if > > that is available and supported by you. > > Developed their own what? Channels? > You can configure these channels to different types of scenarios. > > M > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org<https://e.mail.ru/compose?To=discuss%2dgnura...@gnu.org> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > -- > NE > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- *SCOTT ADAMS: Normal people believe that if it ain't broke, don't fix it. Engineers believe that if it ain't broke, it doesn't have enough features yet.*
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