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Dear all,

We are looking for a robust FSK demodulator and framer solution for an SDR 
application (decoding of simultaneous narrow channels at some kbps each from 
a wider baseband stream) : channel filtering, center frequency tracking, 
demodulation, bit-level timing recovery, synchronisation frame detection, 
etc. Could be either DSP or FPGA based. Any "off the shelf" industrial-level 
IP bricks, open source projects or applications notes that could avoid us to 
develop everything from scratch ?

Thanks for your help !
Yours,
Robert Lacoste
www.alciom.com

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On Thu, 23 Feb 2012 08:31:45 +0100, Robert Lacoste wrote:

> Dear all,
> 
> We are looking for a robust FSK demodulator and framer solution for an
> SDR application (decoding of simultaneous narrow channels at some kbps
> each from a wider baseband stream) : channel filtering, center frequency
> tracking, demodulation, bit-level timing recovery, synchronisation frame
> detection, etc. Could be either DSP or FPGA based. Any "off the shelf"
> industrial-level IP bricks, open source projects or applications notes
> that could avoid us to develop everything from scratch ?

I could be wrong, but this feels like the sort of thing (like PID 
controllers) where, if you're good enough to adapt someone else's work, 
the core functionality is really easy to whomp up from scratch.  
Furthermore (again like PID controllers), it seems that the effort to 
adapt someone else's IP to your particular situation may well eclipse the 
effort to just embed the core functionality into your custom solution.

Things like how the data is coded coming in, whether the sampling rate is 
(or can be) synchronized to the data, what the sampling rate is as a 
proportion of the baud rate (although here it's undoubtedly high), etc., 
are all variables that make a good efficient generic implementation hard 
to do.

The exception would be if it's for some specific radio service, that may 
be popular enough to justify a large, integrated block of IP that has had 
effort poured into it to make it truly portable, and not just a good 
example to follow.

-- 
My liberal friends think I'm a conservative kook.
My conservative friends think I'm a liberal kook.
Why am I not happy that they have found common ground?

Tim Wescott, Communications, Control, Circuits & Software
http://www.wescottdesign.com

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"Tim Wescott" <t...@seemywebsite.com> a écrit dans le message de news: 
l...@web-ster.com...
> On Thu, 23 Feb 2012 08:31:45 +0100, Robert Lacoste wrote:
>
>> Dear all,
>>
>> We are looking for a robust FSK demodulator and framer solution for an
>> SDR application (decoding of simultaneous narrow channels at some kbps
>> each from a wider baseband stream) : channel filtering, center frequency
>> tracking, demodulation, bit-level timing recovery, synchronisation frame
>> detection, etc. Could be either DSP or FPGA based. Any "off the shelf"
>> industrial-level IP bricks, open source projects or applications notes
>> that could avoid us to develop everything from scratch ?
>
> I could be wrong, but this feels like the sort of thing (like PID
> controllers) where, if you're good enough to adapt someone else's work,
> the core functionality is really easy to whomp up from scratch.
> Furthermore (again like PID controllers), it seems that the effort to
> adapt someone else's IP to your particular situation may well eclipse the
> effort to just embed the core functionality into your custom solution.
>
> Things like how the data is coded coming in, whether the sampling rate is
> (or can be) synchronized to the data, what the sampling rate is as a
> proportion of the baud rate (although here it's undoubtedly high), etc.,
> are all variables that make a good efficient generic implementation hard
> to do.
>
> The exception would be if it's for some specific radio service, that may
> be popular enough to justify a large, integrated block of IP that has had
> effort poured into it to make it truly portable, and not just a good
> example to follow.
>
> -- 
> My liberal friends think I'm a conservative kook.
> My conservative friends think I'm a liberal kook.
> Why am I not happy that they have found common ground?
>
> Tim Wescott, Communications, Control, Circuits & Software
> http://www.wescottdesign.com

Thanks Tim, that was unfortunately also my feeling, but I prefered to check 
if there are clever people who have developped very clever and adaptable IPs 
before starting to code... We will follow your advice, probably looking at 
GNUradio to grab goog ideas..

Friendly yours,
Robert

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