Re: [Discuss-gnuradio] How do you measure the channel impulse response?

[sirjanselot]

Thank you for your response.

I've tried gr sounder but from the looks of it, it is only accurate when you
use the LFRX/TX or the RFX boards.

I have a WBX transciever and when I tried it on my first shot measuring the
channel coefficients by directly connecting the output of my TXA to my RXA,
the length of the channel was 32760 coefficients!!!!

I haven't been able to figure out how to read the output.dat of the
gr-sounder yet but this is what is showing me on debugging mode.

It also keeps giving me this warning message: gr_buffer::allocate_buffer:
warning: tried to allocate
   4 items of size 32760. Due to alignment requirements
   512 were allocated.  If this isn't OK, consider padding
   your structure to a power-of-two bytes.
   On this platform, our allocation granularity is 4096 bytes.

Any thoughts?

Thank you.


Martin Braun-4 wrote:
> 
> On Tue, Oct 05, 2010 at 11:43:53AM -0700, sirjanselot wrote:
>> Hello,
>> 
>> I'm trying to figure out how to measure the impulse response of a channel
>> its coefficients.  
> 
> Hello sirjanselot,
> 
> the channel sounder which is part of GNU Radio works, but has no
> synchronisation or anything--so you have no direct means of averaging
> taps. Perhaps you can give it a bash, though.
> 
> Cheers,
> MB
> 
> -- 
> Karlsruhe Institute of Technology (KIT)
> Communications Engineering Lab (CEL)
> 
> Dipl.-Ing. Martin Braun
> Research Associate
> 
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