N210 buffering problems
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Has anyone noticed any buffering issues with USRPs? I can transmit and receive data but whenever I change the transmitted data, the receiver still reads the old transmitted signal. This is true even if I stop transmitting or disconnect the power from the transmitter. If I do a "release" or a very large number of dummy reads, the correct data is read. This leads me to believe there is a problem with buffering but I don't know how to solve this, apart from releasing the system object or reading lots of dummy data (both of these approaches take up a lot of time).
I'm using two N210 with XCVR2450 daughterboards and Matlab R2020a (Communications Toolbox with SDRuTransmitter and SDRuReceiver). I've tried both with and without Burst Mode but that doesn't seem to make any difference. I'm seeing the same problem under Windows 10 and Ubuntu 20.04.
Karunya Choppara on 14 Apr 2021
The dummy data indicates that the data is not valid. If the data length output of the SDRuReceiver is greater than zero, it indicates that the data is valid. If the data length output is zero, it indicates invalid data.
Karunya Choppara on 29 Apr 2021
One trick would be to use burst mode with number of frames in burst set to 1.
We are actively investing to update the internal buffer mechanism to eliminate the invalid data outputs with the receiver. The updates would be available on the release notes at https://in.mathworks.com/help/supportpkg/usrpradio/release-notes.html