We need to demodulate a signal that is of Continuous Phase Fast FSK using the NI Lavbiew and RFSA PXI 5660.

[Sunilrajanna]

The signal details are as follows:

Carrier freq: 452.9375Mhz
Symbol Rate: 1.2Khz
Deviation:

[Benjamin Cook]

Hey Sunilraja,

If you have installed the RFSA Drivers, there will be vi's that do this for you.  In the NI Example Finder, search for FSK, and under the FSK result, there will be an example for demodulating an FSL signal.

Hope this helps,

Benjamin Cook

Applications Engineering

National Instruments

Message Edited by Benjamin Cook on 07-02-2008 12:44 PM

[Paul_C.]

Hi Sunilrajanna,

Ben is correct that you can find many examples in the example finder.  The examples for using FSK demodulation require that you have the Modulation Toolkit.  If you have the modulation toolkit you can find these examples in LabVIEW by going to Help » Find Examples.  Once inside the Example Finder, navigate to Toolkits and Modules » NI-RFSA.  There are two examples for FSK that include MT niRFSA FSK Deviation Measurement.vi and MT niRFSA FSK Trellis Diagram.vi.  These two examples should be a good starting point.  Please let me know if you have any problems running these examples.

Regards,
Paul C.

[Giarc]

Hi Sunilrajanna,

Modulation Toolkit 4.0 also includes VIs to modulate and demodulate Continuous Phase Modulation (CPM).  You can also find examples for these VIs from the Example Finder.  These may fit your needs a little better than just the FSK modulator and demodulator.

Regards,

Craig C.

RF Systems Engineer, NI