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Digital demodulation problem with VSA (QPSK)

Question asked by Paul2 on May 19, 2010
Latest reply on May 19, 2010 by Paul2

I'm trying to demodulate a QPSK signal created with Matlab. This signal is saved in a .txt file without header, with just the amplitude of the signal. The recall function works well with my file, but I can't change any parameters like span and frequency center, and the demodulation function has also the same problem, I can't modify the demod properties like symbol rate.
Are there any important informations to add in the file, or any configuration to make to recall and analyse this kind of file properly?

Here is my matlab file in attachment :
Sample frequency : 5 MHz
Carrier frequency : 50 KHz
Symbol period : 8*pi

Thank you for your help