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RF capture with zedboard and AD-FMCOMMS2-EBZ

Question asked by amy_s on May 16, 2016
Latest reply on May 19, 2016 by amy_s

Hi,

I am trying to capture 2 channels of RF samples from an AD9361 and process the data in Matlab.

I have set up a Zedboard with a Zynq image downloaded from here: https://wiki.analog.com/resources/tools-software/linux-software/zynq_images

I'm using a Matlab script to create an "iio_sys_obj_matlab" IIO System Object, and am calling stepImpl() multiple times.

There is a discontinuity between the data from each call to stepImpl(), presumably because the interface can't keep up with the radio.

rx1.png

I'd like to capture around 300ms of samples, but I seem to be limited to a buffer size of 512k samples - when I request more than this, stepImpl() just returns zeros.

Is there a way of increasing the size of the buffer to many megasamples?

 

Failing this, is there a better approach to capturing large bursts of RF samples into matlab with this hardware?

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