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Re: [Discuss-gnuradio] Can threading disturb sensing continuety
From: |
kaleem ahmad |
Subject: |
Re: [Discuss-gnuradio] Can threading disturb sensing continuety |
Date: |
Fri, 20 Mar 2009 08:30:58 -0700 (PDT) |
Thank Brian,
Can you give some hint, what do mean ??? I mean a little idea what do you
want to say?
Best Regards
Brian Padalino wrote:
>
> On Fri, Mar 20, 2009 at 9:34 AM, kaleem ahmad <address@hidden>
> wrote:
>>
>> Thanks Ed,
>>
>> ADC sampling rate = 64MHz
>> it gives resulution time = 1/64MHz = 156 ns
>> if we choose N=512 for FFT then total observation time for one scan(one
>> complete FFT) is = 156ns x 512 = 8 micro sec
>> if the maximum possible (expected) cycle time is 200ms then:
>> it needs 200ms/8microsec = 2500 continues FFT scans to cover the range of
>> frequencies that correspond to 200ms cycle time.
>>
>> Is above calculation correct?
>>
>> The other possibility to increase the observation time is to increase the
>> FFT size, but to cover entire 200ms would need 200ms/1/64MHz = 12800000 =
>> FFT size (Which is not possible! Is it ???)
>>
>> Now please comment if my above calculations are correct or not and
>> secondaly
>> if my calculations are correct then how can I process (using GNURadio)
>> 2500
>> cosective FFT's (with surety that no FFT in between these 2500 FFT's is
>> missing due to slow processing or thread switching) to find two peaks in
>> a
>> single array (availability of two peaks will give me the oppertunity to
>> calculate the time distance between them).
>
> It sounds like you're trying to do autobaud for an unknown FSK system
> - but using the frequency domain to do this instead of the time domain
> phases.
>
> I'd recommend thinking of an algorithm in the time domain that would
> suit your needs.
>
> Brian
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
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- [Discuss-gnuradio] Can threading disturb sensing continuety, kaleem ahmad, 2009/03/19
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, Ed Criscuolo, 2009/03/19
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, kaleem ahmad, 2009/03/20
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, Brian Padalino, 2009/03/20
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety,
kaleem ahmad <=
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, Brian Padalino, 2009/03/20
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, Johnathan Corgan, 2009/03/20
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, Brian Padalino, 2009/03/20
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, Johnathan Corgan, 2009/03/20
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, kaleem ahmad, 2009/03/23
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, Brian Padalino, 2009/03/23
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, kaleem ahmad, 2009/03/23
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, Brian Padalino, 2009/03/23
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, Ed Criscuolo, 2009/03/22
- Re: [Discuss-gnuradio] Can threading disturb sensing continuety, kaleem ahmad, 2009/03/23