Hi Martin, That´s right! As the number of taps was increased, the deep fadings were visible, ranging until about 20dB.
Thanks and Regards, Ricardo On Sat, Mar 1, 2014 at 8:51 AM, Martin Braun <[email protected]> wrote: > On 02/28/2014 02:13 PM, Ricardo Yoshimura wrote: > > In order to simulate a multi-path scenario, I´m trying to validate the > > "Frequency Selective Fading Model" block, but the results I found are > > not the ones I would expect. > > The set up consisted of 2 taps delayed 20 microseconds each other, so > > that the frequency response should have very deep fadings spaced > > regularly in frequency. The results I got showed a flat frequency > > response, as well as in other standardized power delay profile scenarios. > > The blocks I used were a random source -> OFDM Mod -> Throttle -> > > Frequency Selective Fading Model -> WX GUI FFT Sink. Sample rate was set > > as 1MHz, so that in Freq. Selective block I set PDP Delays as [0, 20] > > and PDP Magnitudes as [1, 1]. > > Please tell me if I misunderstood any of these parameters or this block > > could be really improved. > > Did you increase the number of taps? > Also, note that this block provides a time-variant channel. If you > average, you might not see fades. For a static channel, use the "Channel > Model". > > If you use the default settings, you should see fades, right? > > M > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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