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

[sirjanselot]

I meant TXA to RXB.  

sirjanselot wrote:
> 
> 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
>> 
>> Kaiserstraße 12
>> Building 05.01
>> 76131 Karlsruhe
>> 
>> Phone: +49 721 608-3790
>> Fax: +49 721 608-6071
>> www.cel.kit.edu
>> 
>> KIT -- University of the State of Baden-Württemberg and
>> National Laboratory of the Helmholtz Association
>> 
>> 
>>  
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>> 
>> 
> 
> 

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