I am trying to generate an OFDM waveform with the AD9361 on a ZC706 running Linux. When I look at the signal coming out of the TX antenna, the carrier spacing is about 3-4x wider than it should be.
Is there a way to adjust the spacing of the carrier signal in the TX path? Is there something else it could be? The RX path looks completely valid and I am able to successfully decode signals provided by other source.
I am fairly confident that I am sending the correct IQ samples to the board. When I plot the samples in an application such as MATLAB, they produce a valid waveform.
On the attached image, the yellow line shows the waveform I am expecting, while the blue line is what is being generated by the 9361.