Recent years have witnessed growing interest in reduced cost radar systems operating with low power. Multiple-input multiple-output (MIMO) radar technology is known to achieve high performance sensing by probing with multiple orthogonal waveforms. However, implementing a low cost low power MIMO radar is challenging. One of the reasons for this difficulty stems from the increased cost and power consumption required by analog-to-digital convertors (ADCs) in acquiring the multiple waveforms at the radar receiver. In this work we study reduced cost MIMO radar receivers restricted to operate with low resolution ADCs. We design bit-limited MIMO radar (BiLiMO) receivers which are capable of accurately recovering their targets while operating under strict resolution constraints. This is achieved by applying an additional analog filter to the acquired waveforms, and designing the overall hybrid analog-digital system to facilitate target identification using task-based quantization methods. In particular, we exploit the fact that the target parameters can be recovered from a compressed representation of the received waveforms. We thus tune the acquisition system to recover this representation with minimal distortion, from which the targets can be extracted in digital, and characterize the achievable error in identifying the targets. Our numerical results demonstrate that the proposed BiLiMO receiver operating with a bit budget of one bit per sample achieves target recovery performance which approaches that of costly MIMO radars operating with unlimited resolution ADCs, while substantially outperforming MIMO receivers operating only in the digital domain under the same bit limitations.

中文翻译：

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BiLiMO：基于任务的量化的限位 MIMO 雷达

近年来，人们对以低功率运行的低成本雷达系统越来越感兴趣。众所周知，多输入多输出 (MIMO) 雷达技术可通过使用多个正交波形进行探测来实现高性能感测。然而，实现低成本低功率 MIMO 雷达具有挑战性。造成这种困难的原因之一是模数转换器 (ADC) 在雷达接收器处采集多个波形所需的成本和功耗增加。在这项工作中，我们研究了受限于低分辨率 ADC 操作的低成本 MIMO 雷达接收器。我们设计了位受限的 MIMO 雷达 (BiLiMO) 接收器，它能够在严格的分辨率限制下运行时准确地恢复目标。这是通过对采集的波形应用额外的模拟滤波器，并设计整体混合模数系统以使用基于任务的量化方法促进目标识别来实现的。特别是，我们利用了这样一个事实，即可以从接收波形的压缩表示中恢复目标参数。因此，我们调整采集系统以最小失真恢复这种表示，从中可以以数字方式提取目标，并表征识别目标时可实现的误差。我们的数值结果表明，所提出的 BiLiMO 接收器以每个样本一位的位预算运行，实现了目标恢复性能，接近使用无限分辨率 ADC 运行的昂贵 MIMO 雷达的目标恢复性能，