We present the design and hardware implementation of a radar prototype thatdemonstrates the principle of a sub-Nyquist collocated multiple-inputmultiple-output (MIMO) radar. The setup allows sampling in both spatial andspectral domains at rates much lower than dictated by the Nyquist samplingtheorem. Our prototype realizes an X-band MIMO radar that can be configured tohave a maximum of 8 transmit and 10 receive antenna elements. We use frequencydivision multiplexing (FDM) to achieve the orthogonality of MIMO waveforms andapply the Xampling framework for signal recovery. The prototype also implementsa cognitive transmission scheme where each transmit waveform is restricted tothose pre-determined subbands of the full signal bandwidth that the receiversamples and processes. Real-time experiments show reasonable recoveryperformance while operating as a 4x5 thinned random array wherein the combinedspatial and spectral sampling factor reduction is 87.5% of that of a filled8x10 array.
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