Understanding usrpe3xxToneReceiverML.m example
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Hallo, I can not understand the above mentioned SDR example. They use a DDS inside the FPGA for the creation of the TX signal. From my point of view the dds signal is send to the tx front end and is received by the rx frontend. So actually I need a connection between the tx and rx front end. But when I test this example on my E312 device I can also see a correct spectrum and wave plot with terminated front ends. How is that possible? Is the produced DDS signal send to the rx signal stream path inside the FPGA without using the rf card? Thanks for your answer! Regards, Tobias
Nick Choi on 16 Nov 2017
In the 'Transmit a Tone Signal from the FPGA' section of the example, there is a line that says "Note that the simultaneous transmission and reception of data from MATLAB to RF card (duplex) is currently not supported. Therefore, for this example the data is generated in FPGA using DDS and transmitted directly to the RF card. MATLAB is only used for signal reception"
Based off of this description, I would say that the data signal would be going from the FPGA to the RX of the RF card.