  This paper focuses on the joint synthesis of constant envelope transmit
signal and receive filter aimed at optimizing radar performance in
signal-dependent interference and spectrally contested-congested environments.
To ensure the desired Quality of Service (QoS) at each communication system, a
precise control of the interference energy injected by the radar in each
licensed/shared bandwidth is imposed. Besides, along with an upper bound to the
maximum transmitted energy, constant envelope (with either arbitrary or
discrete phases) and similarity constraints are forced to ensure compatibility
with amplifiers operating in saturation regime and bestow relevant waveform
features, respectively. To handle the resulting NP-hard design problems, new
iterative procedures (with ensured convergence properties) are devised to
account for continuous and discrete phase constraints, capitalizing on the
Coordinate Descent (CD) framework. Two heuristic procedures are also proposed
to perform valuable initializations. Numerical results are provided to assess
the effectiveness of the conceived algorithms in comparison with the existing
methods.
