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AD-FMCOMMS3-EBZ HIL example: QPSK modulation with raised cosine filter

Question asked by elvisjohndowson on Nov 22, 2014
Latest reply on Dec 4, 2014 by elvisjohndowson



I'm trying to create a hardware-in-the-loop example for QPSK modulation with a raised cosine filter, using the AD-FMCOMMS3-EBZ in a 1x1 channel configuration, by merging the simulink iio_sys_obj example located here:


and the simulink models described here:


The problem is that even though I've configured the model to use QPSK modulation, I'm still getting the standard continuous IQ signals.


According to the ad_fmcomms3_ebz.cfg file that I created, data_in_device = cf-ad9361-dds-core-lpc


Q01: Is that the correct device to feed the TX signals from a QPSK or QAM modulator?


Additionally, upon launching the ZC706 target board, the IIO Scope tool defaults to running the script, which generates these continuous IQ signals, which leads me to believe that the Simulink libiio block isn't somehow affecting the settings of the AD-FMCOMMS3-EBZ board.


Q02: What is the correct way to go about realizing this example?


Here is a screenshot of the simulink model, and the corresponding RX1 time scope output.








Elvis Dowson