We consider a multicarrier chirp-based waveform for joint radar and communication (JRC) systems and derive its time discrete periodic ambiguity function (AF). An advantage of the waveform is that it includes a set of waveform parameters (e.g., chirp rate) which together with the transmit sequence, can be selected to flexibly shape the AF to be thumbtack-like, or to be ridge-like, either along the delay axis or the Doppler axis. These shapes are applicable for different use cases, e.g., target detection or time- and frequency synchronization. The results show that better signal detection performance than OFDM and DFT-s-OFDM can be achieved on channels with large Doppler frequency. Furthermore, it is shown how transmit sequences can be selected in order to achieve 0 dB peak-to-average-power-ratio (PAPR) of the waveform.
翻译:我们考虑对联合雷达和通信系统采用多载波的波形,并得出其时间离散的周期模糊功能(AF)。波形的优点是,它包括一套波形参数(例如,声速),连同传输序列,可以选择使AF与缩略图相似,或者沿延迟轴或多普勒轴灵活形状,这些形状适用于不同的使用情况,例如目标探测或时间和频率同步。结果显示,在多普勒频率大的频道上,可以实现比DM和DFT-S-OFDM更好的信号探测性能。此外,还表明,如何选择传输序列,以实现波形的0dB峰值至平均功率坐标(PAPR)。