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From: | Ricardo Yoshimura |
Subject: | Re: [Discuss-gnuradio] Frequency response from fading simulator block not working as expected |
Date: | Fri, 7 Mar 2014 16:04:36 -0300 |
Did you increase the number of taps?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.
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
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