A Bandwidth Efficient Dual-Function Radar Communication System Based on a MIMO Radar Using OFDM Waveforms
A Bandwidth Efficient Dual-Function Radar Communication System Based on a MIMO Radar Using OFDM Waveforms
复制标题
基于使用 OFDM 波形的 MIMO 雷达的带宽高效双功能雷达通信系统
DOI：
10.1109/tsp.2023.3241779
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发表时间：
2023
影响因子：
5.4
通讯作者：
Zhaoyi Xu;A. Petropulu
中科院分区：
文献类型：
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作者：
Zhaoyi Xu;A. Petropulu
提出了一种新型双功能雷达通信（DFRC）系统，该系统实现了高通信速率，并可以灵活地权衡速率以提高感知性能。所提出的系统是一个单基地多输入多输出（MIMO）雷达和发射宽带，预编码，正交频分复用（OFDM）波形从它的天线。系统副载波被分成两组，即，共享和私人。在共享子载波上，所有天线可以同时发送，而在私有子载波上，一次只能有一个天线发送。发射天线共享子载波导致目标回波中发射符号和雷达目标参数的耦合。提出了一种新的、低复杂度的目标估计方法，以克服这种耦合，恢复雷达参数。所提出的方法首先在所有（共享和私有）子载波上操作以获得粗略的角度估计，然后通过基于在私有子载波上接收的信号来微调这些估计。粗略角度估计的分辨率受到物理接收阵列的孔径的限制，而通过有效地构造具有比接收阵列更大孔径的虚拟阵列来实现微调。预编码矩阵被最佳地设计为优化相对于期望波束图案的波束图案误差和通信接收器处的信噪比的加权组合。
A novel dual-function radar communication (DFRC) system is proposed, that achieves high communication rate, and can flexibly trade-off rate for improved sensing performance. The proposed system is a monostatic multiple-input multiple-output (MIMO) radar and transmits wideband, precoded, orthogonal frequency division multiplexing (OFDM) waveforms from its antennas. The system subcarriers are divided into two groups, i.e., shared and private. On a shared subcarrier, all antennas can transmit simultaneously, while on a private one only one antenna can transmit at a time. The shared use of subcarriers by the transmit antennas results in coupling of transmitted symbols and radar target parameters in the target echoes. A novel, low complexity target estimation approach is proposed to overcome the coupling and recover the radar parameters. The proposed method first operates on all (shared and private) subcarriers to obtain coarse angle estimates, and then by fine-tunes those estimates based on the signal received on the private subcarriers. The resolution of the coarse angle estimates is limited by the aperture of the physical receive array, while the fine-tuning is enabled by effectively constructing a virtual array that has larger aperture than the receive array. The precoding matrix is optimally designed to optimize a weighted combination of the beampattern error with respect to a desired beampattern, and the signal-to-noise ratio at the communication receiver.