Hello! I am Charleston Dale M. Ambatali, a lecturer from the Electrical and Electronics Engineering Institute from University of the Philippines - Diliman Campus.
I want to demonstrate the effect of the phase difference between the transmitter and receiver. I am using a Xilinx ZedBoard and an AD-FMCOMMS2-EBZ board. I have programmed the radio as such (based from the cyclic-sine example):
It sends a pure RF tone. The receiver DC correction is disabled. The block diagram of my setup is shown below:
I run the program twice and get two DIFFERENT results. I suspect that it is the effect of the PLL. If I could disable it, I may be able to demonstrate the effect of a non-coherent transmitter and receiver in communications. These are the results run in different times:
As you can observe, the setup behaves in a time-variant manner. I disabled the DC correction and the automatic gain control and I still have this problem. Is it the effect of the PLL or is it something else?