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Re: [Discuss-gnuradio] Multipath Fading

From: Mostafa Alizadeh
Subject: Re: [Discuss-gnuradio] Multipath Fading
Date: Sat, 25 Apr 2015 21:22:20 +0430

I think this block is just a single tap channel. If you want to have multipath channel use channel_model2 instead: 



On Sat, Apr 25, 2015 at 8:44 PM, Ritvik Pandey <address@hidden> 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 <address@hidden> 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:

Set like this:
N = 8
FTds = .01
LOS = false
K = 4
Seed = 1

On Apr 25, 2015 8:27 PM, "Ritvik Pandey" <address@hidden> 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

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 <address@hidden> 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?


On Sat, Apr 25, 2015 at 9:07 PM, Mostafa Alizadeh <address@hidden> 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 <address@hidden> 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 <address@hidden> 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?

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Amirkabir University Of Technology
Tel: +98 (919) 158-7730
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