The daughterboards listed on the USRP support package website have been tested with MATLAB and Simulink. Furthermore, as mentioned on the webpage "support may also extend to other UHD-based radios and daughterboards from Ettus Research LLCT."
This means that MathWorks has not tested these daughterboards; however, they should work since MathWorks uses the universal hardware driver (UHD) provided by Ettus Research.
Support for the Ettus Research N210 radio in particular, and for Ettus UHD-based radios in general, is now available from MathWorks. The latest download package supports use of the radios with either MATLAB or Simulink.
You can get more information and the support package here:
As of MATLAB R2019a, the ability to access a different antenna port (other than the default) is not available for Transmitter and Receiver blocks in Communications Toolbox Support Package for USRP.
This is a known limitation. There are no workarounds.
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