Hi Sana,
I understand that one of the USRPs is not being detected. Here are some possible causes and troubleshooting steps you can try:
1. Ensure that the MIMO cable is securely connected to both USRPs and the host computer. Make sure the cable is not damaged or loose.
2. Ensure that your version of MATLAB is compatible with the USRP devices you are using. Check the MATLAB documentation for compatibility information.
3. Open the device manager on your host computer and check if the USRP is listed under the "Universal Serial Bus controllers" section. If it is not listed or shows an error symbol, there might be driver issues. Try reinstalling the USRP driver.
4. Ensure that your MATLAB software is properly configured to detect and communicate with the USRPs. Check if you have the necessary drivers and software packages installed for the USRPs to work with MATLAB.
5. Firmware and software updates: Make sure that both the USRP firmware and MATLAB software are up to date. Sometimes, compatibility issues can arise if the firmware or software versions are not compatible.
6. Make sure you have the appropriate MATLAB support package installed for the USRP devices. MATLAB provides support packages for various hardware devices, including USRPs.
I hope this solves your query. For more information on connecting MATLAB to USRPs, please refer the link below: