An Enhanced Radar and Communication Coexistence Scheme with Spatio-Temporal Design

A spatio-temporal co-design framework for simultaneous optimization of the performance of radar and communication system in spectrum coexistence scenario is developed. We use the signal-to-interference-plus noise ratio (SINR) on the radar side and the communication rate on the communication side as the performance indicators of the two subsystems, and obtain the original nonconvex optimization problem under the energy and spectrally compatible constraints. Considering the complexity of the original trivariate nonconvex problem, a sequential iterative optimization framework with more design degrees of freedom is presented to transform the nonconvex problem into several single-variable subproblems. Then, the alternating direction method of multipliers (ADMM) method and minimum variance distortionless response criteria are adopted to solve the transformed subproblems. Finally, the superiority of the proposed design has been substantiated through simulation results.