Phase-modulated Waveform Design Using Maximum Mutual Information Criterion

The optimal radar waveform for target information extraction had been derived to be the waterfilling solution using maximum Mutual information (MI) criterion, however, the optimal waveform is not a constantenvelop signal. In order to make full use of the system radiated power, a phase-iterative method to design the constant-envelop phase-modulated waveform is proposed. By minimizing the Euclidean distance between the designed waveform and the optimal one, the proposed method can achieve a small MI loss. The results of extensive simulations demonstrate that the MI loss of our approach can be less than 0.5nat when the signal duration is greater than 1μs.