  Designing unimodular waveforms with a desired beampattern, spectral occupancy
and orthogonality level is of vital importance in the next generation
Multiple-Input Multiple-Output (MIMO) radar systems. Motivated by this fact, in
this paper, we propose a framework for shaping the beampattern in MIMO radar
systems under the constraints simultaneously ensuring unimodularity, desired
spectral occupancy and orthogonality of the designed waveform. In this manner,
the proposed framework is the most comprehensive approach for MIMO radar
waveform design focusing on beampattern shaping. The problem formulation leads
to a non-convex quadratic fractional programming. We propose an effective
iterative to solve the problem, where each iteration is composed of a
Semi-Definite Programming (SDP) followed by eigenvalue decomposition. Some
numerical simulations are provided to illustrate the superior performance of
our proposed over the state-of-the-art.
