To overcome the necessity of high sampling rates for common orthogonal frequency-division multiplexing (OFDM)-based radar waveforms with a good range resolution, a scheme called frequency comb OFDM radar has recently been proposed. It keeps the sampling rates at the transmitter and receiver constant while simultaneously increasing the signal bandwidth in the radar channel. This letter describes the extension of the scheme for multiple-input multiple-output (MIMO) applications where a nonequidistant subcarrier interleaving can be used to prevent a reduction of the unambiguous range that occurs in case of regular allocation to the transmit channels. The functionality is demonstrated for the first time with a $4 \times 4$ MIMO system in a measurement scenario with static and emulated moving targets.

中文翻译：

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具有非等距子载波交织的频率梳状 MIMO OFDM 雷达

为了克服具有良好距离分辨率的基于公共正交频分复用 (OFDM) 的雷达波形的高采样率的必要性，最近提出了一种称为频率梳 OFDM 雷达的方案。它使发射机和接收机的采样率保持恒定，同时增加雷达通道中的信号带宽。这封信描述了多输入多输出 (MIMO) 应用方案的扩展，其中非等距副载波交织可用于防止在定期分配到发射信道的情况下出现的明确范围的减少。在具有静态和模拟移动目标的测量场景中，该功能首次通过 4 美元\乘以 4 美元 MIMO 系统进行演示。