Hello Ritvik, I have a few questions, could you find a quick answer to each of them, so that I understand the situation better?
I'm very confused, because you have a screenshot of a Flowgraph that has multiple QT GUI sinks, but is set to WX. And then you have a screenshot of QT Gui visualizations and also one of WX GUI visualizations. Would you mind explaining these graphs a bit better? In which file do you show what? Why are you using real-world measured signal from a USRP source to test the fading simulator in GNU Radio? Why not simply use a noise source? >But as a result there is increment in the signal power which is excatly the opposite of the theory. What is it that you were expecting? Thanks, Marcus On 05/07/2015 10:42 AM, Ritvik Pandey wrote: > > ---------- Forwarded message ---------- > From: *Ritvik Pandey* <[email protected] > <mailto:[email protected]>> > Date: Fri, May 1, 2015 at 9:59 AM > Subject: Re: [Discuss-gnuradio] Multipath Fading > To: Mostafa Alizadeh <[email protected] > <mailto:[email protected]>> > > > Hey, > I tried applying multipath fading in Gnu radio. > But as a result there is increment in the signal power which is > excatly the opposite of the theory. > kindly find the attachments for the images. > > On Sat, Apr 25, 2015 at 10:28 PM, Ritvik Pandey > <[email protected] <mailto:[email protected]>> wrote: > > Thank You so much > > On Sat, Apr 25, 2015 at 10:22 PM, Mostafa Alizadeh > <[email protected] <mailto:[email protected]>> wrote: > > I think this block is just a single tap channel. If you want > to have multipath channel use channel_model2 instead: > > > http://gnuradio.org/doc/doxygen/classgr_1_1channels_1_1channel__model2.html > > Best, > Mostafa > > On Sat, Apr 25, 2015 at 8:44 PM, Ritvik Pandey > <[email protected] <mailto:[email protected]>> wrote: > > Okay ill work on this and get back to you if i face any > problems...for now one last thing according to the theory > fading is a result of multipath so does this block > implements multipath and then shows the faded result or it > just filters the fading output of an input signal. > > > On Sat, Apr 25, 2015 at 9:41 PM, Mostafa Alizadeh > <[email protected] <mailto:[email protected]>> > wrote: > > The frequency measurement doesn't give any insight > rather to see just time variation of the power of the > signal (i think you're using a single tone source ). I > prefer to plot the singal in time domain to see fading > effects. > > The fading block has different parameters as said: > > http://gnuradio.org/doc/doxygen/classgr_1_1channels_1_1fading__model.html > > Set like this: > N = 8 > FTds = .01 > LOS = false > K = 4 > Seed = 1 > > On Apr 25, 2015 8:27 PM, "Ritvik Pandey" > <[email protected] > <mailto:[email protected]>> wrote: > > See i am using a signal source and fast noise > source as inputs...adding these it passes through > the fading block and then towards the fft sink or > waterfall sink. > > Input Parameters in signal source: > Freq: 1 M > Amplitude: 1 > > Noise Source: > Amplitude: 1 > > Fading Block: > Normalized Doppler: 10.0 > Rayleigh > > This for testing the fading block initially in the > final stage i have to take the signal from usrp. > > > > On Sat, Apr 25, 2015 at 9:23 PM, Mostafa Alizadeh > <[email protected] > <mailto:[email protected]>> wrote: > > What is the input of the gnuradio's block > you've set?? > I think you're using the gnuradio's block > wrongly! > > Dear Mostafa, > > I have tried making a flowgraph using the > fading blocks, but i am not able to understand > the output. I have compared the input and > output it seems almost the same. Can you guide > to the mathematical model of the fading block > in gnu radio, so that i can understand what > actually is happening to the input signal? > > Regards > > On Sat, Apr 25, 2015 at 9:07 PM, Mostafa > Alizadeh <[email protected] > <mailto:[email protected]>> wrote: > > Hi Ritvik, > > If you have enough background knowledge > you need classify channels as follow: > > 1) Rician channel: which has a > line-of-sight(LOS) path between a > transmitter and a receiver. > 2) Rayleigh fading channel: which doesn't > have any LOS. > 3) Something between Rayleigh and Ricean > channel: using Nakagami distribution with > parameter K varying 0-inf. > > You need to first generate samples of > these distributions. > > > On Sat, Apr 25, 2015 at 4:06 PM, Ritvik > Pandey <[email protected] > <mailto:[email protected]>> wrote: > > Regarding my last post i want to bring > it to your notice that i have to > implement a multipath fading channel > emulator so can you tell me how can i > do that? > > On Sat, Apr 25, 2015 at 5:03 PM, > Ritvik Pandey <[email protected] > <mailto:[email protected]>> wrote: > > Dear Sir/Mam, > > Hello, i am a student working on > the development of a channel > emulator, Can you tell me how can > you make one in GNU Radio? > > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > <mailto:[email protected]> > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > -- > > *********************************************************** > Department of Electrical Engineering > Aboureyhan Building > MMWCL LAB > Amirkabir University Of Technology > Tehran > IRAN > Tel: +98 (919) 158-7730 > LAB: > http://ele.aut.ac.ir/~mmwcl/?page_id=411 > <http://ele.aut.ac.ir/%7Emmwcl/?page_id=411> > Homepage: http://ele.aut.ac.ir/~alizadeh/ > <http://ele.aut.ac.ir/%7Ealizadeh/> > > *********************************************************** > > > > > > > > -- > *********************************************************** > Department of Electrical Engineering > Aboureyhan Building > MMWCL LAB > Amirkabir University Of Technology > Tehran > IRAN > Tel: +98 (919) 158-7730 > LAB: http://ele.aut.ac.ir/~mmwcl/?page_id=411 > <http://ele.aut.ac.ir/%7Emmwcl/?page_id=411> > Homepage: http://ele.aut.ac.ir/~alizadeh/ > <http://ele.aut.ac.ir/%7Ealizadeh/> > *********************************************************** > > > > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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