针对基于正交频分复用的雷达通信一体化波形设计中，通信信息的随机性会影响雷达性能以及过高峰均包络比(PAPR)可能导致信号在射频端出现严重失真的问题，文中提出了利用非正交多址将雷达信号与通信信号在功率域中分开，以降低通信信息随机性对雷达性能的影响，并利用主动星座图扩展(ACE)对叠加信号进行PAPR 抑制的波形设计方法。首先，分析了传统功率分配原则导致叠加星座出现混叠的原因,并给出在不同调制阶数的最佳功率分配；其次，从理论上分析了ACE 技术对叠加信号进行PAPR 抑制的可行性；最后，仿真结果表明，在不同调制方式和不同信噪比下，当功率分配最佳时能同时达成雷达信号高检测率和通信符号最低误码率。ACE 技术的使用同时保证了优良的雷达性能和通信端的低误码率，对叠加信号的PAPR 有较好的抑制效果。

In order to solve the problem that the randomness of the communication information will affect the radar performance and the signal with excessive peak average envelope ratio (PAPR) may lead to serious distortion at the radio frequency end in the integrated waveform design of radar communication based on orthogonal frequency division multiplexing, a waveform design method is proposed in this paper that uses non-orthogonal multiple access to separate the radar signal from the communication signal in the power domain to reduce the influence of the randomness of the communication information on the radar performance, and the active constellation map extension (ACE) is used to suppress the PAPR of the superimposed signal. Firstly, the reasons for the aliasing of superimposed constellations caused by the traditional power allocation principle are analyzed, and the optimal power allocation at different modulation orders is given. Secondly, the feasibility of ACE technology for PAPR suppression of superimposed signals is analyzed theoretically. Finally, the simulation results show that under different modulation modes and different signal-to-noise ratios, the high detection rate of radar signals and the minimum bit error rate of communication symbols can be achieved at the same time when the power allocation is optimal. The use of ACE technology not only ensures excellent radar performance and low bit error rate on the communication side, but also has a good suppression effect on the PAPR of superimposed signals.

TN957

国家自然科学基金资助项目(61771160);山东省自然科学基金资助项目(ZR2019BF037)