Hi J,
Please have a look at this example - https://www.mathworks.com/help/comm/usrpradio/ug/direction-of-arrival-estimation-using-music-and-twinrx.html.
In this example, a phase calibration process is carried out to estimate and correct for phase offset the four channels on a USRP X310 with TwinRX daughterboards. Although the example has not been written for an N310, it should be applicable.
People do all sorts with MATLAB and USRPs. Please have a look at Wireless Testbench which is the toolbox which supports USRP N3xx, X3xx and X4xx. The primary workflows are signal transmit and capture, signal detection, spectrum monitoring, code generation and deployment. There is a substantial list of examples - https://www.mathworks.com/help/wireless-testbench/examples.html?s_tid=CRUX_topnav.
If you have a USRP2, B2xx or N2xx, you should look at the Communications Toolbox Support Package for USRP Radio.
Thanks,
Neil
