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Re: [Discuss-gnuradio] How do you measure the channel impulse response?
From: |
sirjanselot |
Subject: |
Re: [Discuss-gnuradio] How do you measure the channel impulse response? |
Date: |
Wed, 6 Oct 2010 08:41:32 -0700 (PDT) |
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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