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FSK Correlation Demodulator

Started by opamp ●December 8, 2005
Hello,

I want to demodulate a FSK signal by correlation dedector. But I have no
knowledge how it will be done. Can you show me the way?
Reply by Jerry Avins ●December 8, 20052005-12-08
opamp wrote:

> Hello,
> 
> I want to demodulate a FSK signal by correlation dedector. But I have no
> knowledge how it will be done. Can you show me the way?


I hope someone can, but that one isn't me. I have a question for you, 
though. If you know nothing about it, why does it appeal to you?

Jerry
-- 
Engineering is the art of making what you want from things you can get.
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Reply by Vladimir Vassilevsky ●December 8, 20052005-12-08

opamp wrote:


> Hello,
> 
> I want to demodulate a FSK signal by correlation dedector. But I have no
> knowledge how it will be done.  Can you show me the way?
> 


The best way to demodulate FSK is to pay to someone who knows how do it.
Also I can show you the way to the library.

VLV
Reply by Glennaebad ●December 8, 20052005-12-08
"opamp" <ozyalcin@yahoo.com> wrote in message
news:saWdnUxjxYaJ1wXenZ2dnUVZ_tKdnZ2d@giganews.com...

> Hello,
>
> I want to demodulate a FSK signal by correlation dedector. But I have no
> knowledge how it will be done. Can you show me the way?
>


Use a PLL.

Glen
Reply by opamp ●December 9, 20052005-12-09
>
>"opamp" <ozyalcin@yahoo.com> wrote in message
>news:saWdnUxjxYaJ1wXenZ2dnUVZ_tKdnZ2d@giganews.com...
>> Hello,
>>
>> I want to demodulate a FSK signal by correlation dedector. But I have

no

>> knowledge how it will be done. Can you show me the way?
>>
>
>Use a PLL.
>
>Glen
>
>
>


Because I'm trying to do a FSK homework. And this subjects aren't touched
on during lesson. I have to do these ones by searching. I search every
site, but I couldn't find any information about how the correlation
dedector is applied in to demodulation in matlab. I asked because of
this...Still,I don't know correlation...If you really know a source about
this, please share with me...
Reply by Vale_a_pena ●December 10, 20052005-12-10
I can try to help you Opamp.

Even without money :)

When you mix two signals:      y1*y2         with y1 FSK signal and y2 a
sinusoid

You obtain a result varying in time  (y1*y2)(t)


Correlation is the integral during a period of  T of (y1*y2)(t)

e.g     if y1 and y2 during T seconds have different frequencies (in general
different phases along time), if the integral is near zero, it can be said
that y1 and y2 are uncorrelated or dissimilar.

"opamp" <ozyalcin@yahoo.com> escreveu na mensagem
news:CLmdnQYCO7WlWgTenZ2dnUVZ_tqdnZ2d@giganews.com...

> >
> >"opamp" <ozyalcin@yahoo.com> wrote in message
> >news:saWdnUxjxYaJ1wXenZ2dnUVZ_tKdnZ2d@giganews.com...
> >> Hello,
> >>
> >> I want to demodulate a FSK signal by correlation dedector. But I have
> no
> >> knowledge how it will be done. Can you show me the way?
> >>
> >
> >Use a PLL.
> >
> >Glen
> >
> >
> >
>
> Because I'm trying to do a FSK homework. And this subjects aren't touched
> on during lesson. I have to do these ones by searching. I search every
> site, but I couldn't find any information about how the correlation
> dedector is applied in to demodulation in matlab. I asked because of
> this...Still,I don't know correlation...If you really know a source about
> this, please share with me...
Reply by Stan Pawlukiewicz ●December 12, 20052005-12-12
Vale_a_pena wrote:

> I can try to help you Opamp.
> 
> Even without money :)
> 
> When you mix two signals:      y1*y2         with y1 FSK signal and y2 a
> sinusoid
> 
> You obtain a result varying in time  (y1*y2)(t)
> 
> 
> Correlation is the integral during a period of  T of (y1*y2)(t)


This is the zero lag correlation, not correlation.  y1 and y2 can be 
nearly orthogonal.  Orthognal signals are highly correlated.



> 
> e.g     if y1 and y2 during T seconds have different frequencies (in general
> different phases along time), if the integral is near zero, it can be said
> that y1 and y2 are uncorrelated or dissimilar.
> 
> "opamp" <ozyalcin@yahoo.com> escreveu na mensagem
> news:CLmdnQYCO7WlWgTenZ2dnUVZ_tqdnZ2d@giganews.com...
> 
>>>"opamp" <ozyalcin@yahoo.com> wrote in message
>>>news:saWdnUxjxYaJ1wXenZ2dnUVZ_tKdnZ2d@giganews.com...
>>>
>>>>Hello,
>>>>
>>>>I want to demodulate a FSK signal by correlation dedector. But I have
>>
>>no
>>
>>>>knowledge how it will be done. Can you show me the way?
>>>>
>>>
>>>Use a PLL.
>>>
>>>Glen
>>>
>>>
>>>
>>
>>Because I'm trying to do a FSK homework. And this subjects aren't touched
>>on during lesson. I have to do these ones by searching. I search every
>>site, but I couldn't find any information about how the correlation
>>dedector is applied in to demodulation in matlab. I asked because of
>>this...Still,I don't know correlation...If you really know a source about
>>this, please share with me...
> 
> 
>
Reply by DennisSeguine ●November 25, 20112011-11-25
>Hello,
>
>I want to demodulate a FSK signal by correlation dedector. But I have no
>knowledge how it will be done. Can you show me the way?
>
>


Obviously too late for the original author's question (by 6 years), but if
anyone else cares, the simple algebra behind FSK demodulation is contained
in Cypress Semiconductor app note AN2336.
---- Dennis
Reply by John ●November 25, 20112011-11-25
On Nov 25, 3:12&#4294967295;pm, "DennisSeguine" <seg@n_o_s_p_a_m.cypress.com>
wrote:

> >Hello,
>
> >I want to demodulate a FSK signal by correlation dedector. But I have no
> >knowledge how it will be done. Can you show me the way?
>
> Obviously too late for the original author's question (by 6 years), but if
> anyone else cares, the simple algebra behind FSK demodulation is contained
> in Cypress Semiconductor app note AN2336.
> ---- Dennis


This is actually a cool topic if you think about multiple symbol
observations. Here is an old but good paper that illustrates some of
the possibilities.

http://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=1011&context=ece_articles

John
Reply by John ●November 25, 20112011-11-25
On Nov 25, 3:35&#4294967295;pm, John <sampson...@gmail.com> wrote:

> On Nov 25, 3:12&#4294967295;pm, "DennisSeguine" <seg@n_o_s_p_a_m.cypress.com>
> wrote:
>
> > >Hello,
>
> > >I want to demodulate a FSK signal by correlation dedector. But I have no
> > >knowledge how it will be done. Can you show me the way?
>
> > Obviously too late for the original author's question (by 6 years), but if
> > anyone else cares, the simple algebra behind FSK demodulation is contained
> > in Cypress Semiconductor app note AN2336.
> > ---- Dennis
>
> This is actually a cool topic if you think about multiple symbol
> observations. Here is an old but good paper that illustrates some of
> the possibilities.
>
> http://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=1011&context=...
>
> John


Sorry about that truncated link. Here is the IEEE ref:

http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?isnumber=23821&arnumber=1092333&count=27&index=9

John