Number of recovered bits is less than the input bits in Demodulation of PSK- using Modulation Toolkit

[jawadkhokhar]

Whenever I try to demodulate any given complex baseband signal generated through the MT modulate PSK.vi and demodulate it using MT Demodulate PSK.vi , the number of recovered bits is always lesser than the number of bits initially given in the input bit stream.

I would be grateful to anyone who has a solution to this problem.

Thanks

Jawad

[Jim_S]

Hello Jawad,

If you could post your code implementing this modulation and demodulation, it will make it easier to see why this is occurring. Also which bits are being lost and where are these bits located in the data?

JimS.

[jawadkhokhar]

Hello JimS

Please check the attached file.

Thanks

Jawad

[Chris_W.]

Hi Jawad,

It looks like the issue probably lies in the fact that your bistream has no guard bits or synch bits, which should ensure that the message information gets pushed through the filters properly. What I would do is to take a look at the example program named "MT PSK Transceiver (One Shot).vi" which is one of the example programs that installs with the modulation toolkit. You can find it at the file location C:\Program Files\National Instruments\LabVIEW XXXX\examples\Modulation\simulation examples\Interactive, for whichever version of LabVIEW you're using (hence the XXXX). This example goes through and sets up all needed parameters to simulate a one shot generation/recieve.

Chris W