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 <pandey.rit...@gmail.com> 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 <m.alizade...@gmail.com> > 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" <pandey.rit...@gmail.com> 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 < >>> m.alizade...@gmail.com> 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 < >>>> m.alizade...@gmail.com> 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 < >>>>> pandey.rit...@gmail.com> 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 < >>>>>> pandey.rit...@gmail.com> 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 >>>>>> Discuss-gnuradio@gnu.org >>>>>> 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 >>>>> Homepage: http://ele.aut.ac.ir/~alizadeh/ >>>>> *********************************************************** >>>>> >>>> >>>> >>> > -- *********************************************************** 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 Homepage: http://ele.aut.ac.ir/~alizadeh/ ***********************************************************
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