Re: [Discuss-gnuradio] Channel Impulse Response

[Nazmul Islam]

Hello Daviko,

I used gnuradio in channel sounding experiments during the summer. I did not use gr-sounder. Rather, I designed my own transmitter and receiver block diagrams using GRC.

You can do both sliding correlator and frequency domain channel sounding using GNUradio. Sliding correlator method directly generates the channel impulse response. Frequency domain sounding allows you to find the impulse response through inverse FFT procedure. There might be other methods that I am unaware of.

In general, the frequency domain channel sounding method gives you the channel strengths at different carrier frequencies.Let's say, your desired frequency band is 700-720 MHz region. You can transmit a sinusoid from the transmitter that repeatedly hops at 700, 701, 702, ..., 720, 700, 701, .. , 720 MHz. Your receiver's carrier frequency should hop repeatedly in the same list. If you can time synchronize your Tx & Rx, you will know the path loss by taking FFT and observing the strength of the floating points in the desired FFT bin.

 

Thanks,

Nazmul

 

On Fri, Nov 16, 2012 at 3:30 PM, daviko <address@hidden> wrote:

Hi
I want to find *"channel impulse response"* for my project using sounding
techniques
I came to know about the 'gr-sounder' application which does just the thing
and was implemented in previous versions of gnuradio. I have version 3.6.0

how can I use this app for my purpose?
any help is appreciated

Thanks in advance



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Muhammad Nazmul Islam

Graduate Student
Electrical & Computer Engineering
Wireless Information & Networking Laboratory
Rutgers, USA.