Coexisting radar and communication (CRC) systems on the same spectrum band have been recently recognized as a promising approach to solve the spectrum scarcity problem. Additionally, with the new requirements of achieving higher energy efficiency and restoring the consumed power, an initiative has been exploited to embed both information and energy within the same signal. Motivated by that, this paper presents a unified model to implement the concept of simultaneous wireless information and power transfer (SWIPT) in the coexistence environment between radar and communication systems. Specifically, we propose a novel energy harvesting based CRC model (CRCEH), in which the signals transmitted from both the communication and radar transmitters are precoded towards their conventional targets, communication receiver and radar targets respectively, as well as to an energy harvesting receiver. This system is capable of solving the spectrum scarcity problem as well as supporting low power devices with their energy requirements from the energy harvested at the energy harvesting receiver. The design problem is formulated as maximizing the radar detection probability subject to communication capacity and energy harvesting constraints. However, directly processing the data from the radar receiver requires high computational complexity and hardware costs. In order to circumvent this issue, this paper also proposes to deploy lens antenna array (LNA) to CRCEH system to sharply direct the signals to the energy harvesting receiver together with their respective destinations. Since LNA is able to focus the signal power on a subset of antennas, we may only deal with the data from the selective antenna subset associated with the maximal power. Numerical results show that the proposed method is able to achieve improved performance in terms of radar detection under communication capacity constraints compared to the conventional approaches besides the great benefit of harvesting the energy to feed some limited energy devices.

中文翻译：

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透镜天线阵列辅助具有能量收集的共存雷达和通信系统

在同一频段上共存的雷达和通信 (CRC) 系统最近被认为是解决频谱稀缺问题的一种有前途的方法。此外，随着实现更高能效和恢复消耗功率的新要求，已开发出一项将信息和能量嵌入同一信号中的举措。受此启发，本文提出了一个统一模型，以在雷达和通信系统之间的共存环境中实现同步无线信息和功率传输 (SWIPT) 的概念。具体来说，我们提出了一种新的基于能量收集的 CRC 模型（CRCEH），其中从通信和雷达发射机发射的信号分别针对其常规目标、通信接收机和雷达目标进行预编码，以及能量收集接收器。该系统能够解决频谱稀缺问题，并支持低功率设备从能量收集接收器收集的能量中满足其能量需求。设计问题被表述为在受通信容量和能量收集约束的情况下最大化雷达检测概率。然而，直接处理来自雷达接收器的数据需要很高的计算复杂度和硬件成本。为了规避这个问题，本文还建议在 CRCEH 系统中部署透镜天线阵列 (LNA)，以将信号与其各自的目的地一起快速引导到能量收集接收器。由于 LNA 能够将信号功率集中在天线子集上，我们可能只处理来自与最大功率相关的选择性天线子集的数据。数值结果表明，与传统方法相比，所提出的方法能够在通信容量受限的情况下实现改进的雷达检测性能，此外还有收集能量以馈送一些有限能量设备的巨大好处。