The existing radar-communication coexistence (RCC) waveform design based on chirp signal causes the increase of the complexity in the communication receiver, and multi-dimensional reuse also introduces more interference, leading to the deterioration of dual function performance. In this paper, a frequency division RCC system with on-off keying (OOK) based on frequency modulated continuous wave is designed for near sensors wake-up or low rate broadcast. The RCC signal has the fixed whole band and the variable sub-bands for radar signal and communication signal. We propose a two-stage envelope detection (TSED) scheme by extracting data from the frequency difference component of the two signals at the receiver without generating local radio frequency signal or using a mixer. By flexibly regulating the frequency band of two signals, the anti-interference ability of TSED can be further improved. In radar system, we perform small frequency hopping (FH) on radar signal to realize the full use of the whole band, and propose a scheme of abnormal peak detection and elimination (APDE) to eliminate the chirp interference. The simulation results show that the signal-to-interference ratio of TSED scheme for the RCC waveform can be respectively enhanced by 6 dB and 2 dB if compared with that of conventional envelope detection and coherent demodulation with a bit error rate of 10. Besides, The APDE scheme based on small FH reduces the range sidelobe by 20 dB and completely eliminates the added in-band interference.

中文翻译：

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基于OOK-chirp的RCC系统的干扰抑制和低复杂度通信接收

现有基于线性调频信号的雷达通信共存(RCC)波形设计导致通信接收机复杂度的增加，多维复用也引入了更多的干扰，导致双功能性能恶化。本文设计了一种基于调频连续波的开关键控（OOK）频分RCC系统，用于近传感器唤醒或低速率广播。 RCC信号具有固定的全频段和针对雷达信号和通信信号的可变子频段。我们提出了一种两级包络检测（TSED）方案，通过在接收器处从两个信号的频差分量中提取数据，而不生成本地射频信号或使用混频器。通过灵活调节两个信号的频段，可以进一步提高TSED的抗干扰能力。在雷达系统中，我们对雷达信号进行小跳频（FH）以实现整个频段的充分利用，并提出了异常峰值检测和消除（APDE）方案来消除线性调频干扰。仿真结果表明，在误码率为10的情况下，TSED方案对于RCC波形的信干比比传统包络检波和相干解调分别提高了6 dB和2 dB。基于小FH的APDE方案将距离旁瓣降低了20dB，完全消除了增加的带内干扰。