  Sparse array design aided by emerging fast sensor switching technologies can
lower the overall system overhead by reducing the number of expensive
transceiver chains. In this paper, we examine the active sparse array design
enabling the maximum signal to interference plus noise ratio (MaxSINR)
beamforming at the MIMO radar receiver. The proposed approach entails an
entwined design, i.e., jointly selecting the optimum transmit and receive
sensor locations for accomplishing MaxSINR receive beamforming. Specifically,
we consider a co-located multiple-input multiple-output (MIMO) radar platform
with orthogonal transmitted waveforms, and examine antenna selections at the
transmit and receive arrays. The optimum active sparse array transceiver design
problem is formulated as successive convex approximation (SCA) alongside the
two-dimensional group sparsity promoting regularization. Several examples are
provided to demonstrate the effectiveness of the proposed approach in utilizing
the given transmit/receive array aperture and degrees of freedom for achieving
MaxSINR beamforming.
