Cooperative Design for MIMO Radar- Communication Spectral Sharing System Based on Mutual Information Optimization

This paper considers a novel cooperative design for radar-communication spectral sharing system with multiple-input multiple-output (MIMO) structure based on mutual information optimization. We present a new spectral sharing framework aiming at maximizing the radar mutual information. Specifically, the transmit sequences including radar waveform and communication codebook are designed simultaneously based on radar and communication system mutual information optimization. Subsequently, an iterative procedure is devised to maximize the radar mutual information under the constraints including the transmit power, the constant modulus requirement for radar waveform, and the communication system mutual information performance requirement constraint. The proposed approach exploits the alternating optimization based on the Minorization-Maximization (MM) framework, Lagrange algorithm, and the alternating direction method of multipliers (ADMM) techniques to decompose the original design into two simpler subproblems with a closed-form solution. Simulation results are presented to demonstrate the advantage of the proposed schemes.