Hello I ahve a simple QPSK model that I have enclosed. I have been staring at it for quite sometimes now but can seem to find out what is wrong.
The model modultes a signal to 153 MHz. I am resampling at 150 MHZ to shift the spectrum to 3 MHz. I use the filter - It is not needed here- But I intend to add channels at 156MHz, 159MHz, etc.
1- The demodulated Q side in inverted and I do not know why.
2- When I change the filter coeficent to a singned integers, it does not work at all.
I am having diffeculty adding the BER. But that is for next time.
Any help is greatly appreciated. :?:
[file]myqpsk.svu[/file]
The model modultes a signal to 153 MHz. I am resampling at 150 MHZ to shift the spectrum to 3 MHz. I use the filter - It is not needed here- But I intend to add channels at 156MHz, 159MHz, etc.
1- The demodulated Q side in inverted and I do not know why.
2- When I change the filter coeficent to a singned integers, it does not work at all.
I am having diffeculty adding the BER. But that is for next time.
Any help is greatly appreciated. :?:
[file]myqpsk.svu[/file]