论文标题
单恒定ISAC通道中的自由度：NLOS剥削与降低
The Degrees-of-Freedom in Monostatic ISAC Channels: NLoS Exploitation vs. Reduction
论文作者
论文摘要
分析了在单恒定的综合传感和通信（ISAC）中获得的自由度（DOF）。具体而言，由于非LOS（NLOS）路径仅包含混乱或干扰，因此单静感感应旨在从发射机和目标之间从视觉线（LOS）通道中提取目标取向信息。相比之下，在无线通信中，通常利用LOS和NLOS路径来实现多样性或多路复用。因此，我们阐明了NLOS的剥削与减少折衷方案的单位ISAC场景。特别是，我们优化了每个信号路径的发射功率，以最大程度地提高通信速率，同时保证目标的传感性能。首先，针对单个NLOS链接方案，首先以封闭形式解决了非凸问题，然后我们利用普通的连续凸近近似方法（SCA）方法用于一般的多个NLOS-LINK场景。我们的仿真结果表征了传感和通信之间的基本性能权衡，表明应以与仅通信场景明显不同的方式有效利用ISAC渠道中的可用DOF。
The degrees of freedom (DoFs) attained in monostatic integrated sensing and communications (ISAC) are analyzed. Specifically, monostatic sensing aims for extracting target-orientation information from the line of sight (LoS) channel between the transmitter and the target, since the Non-LoS (NLoS) paths only contain clutter or interference. By contrast, in wireless communications, typically, both the LoS and NLoS paths are exploited for achieving diversity or multiplexing gains. Hence, we shed light on the NLoS exploitation vs. reduction tradeoffs in a monostatic ISAC scenario. In particular, we optimize the transmit power of each signal path to maximize the communication rate, while guaranteeing the sensing performance for the target. The non-convex problem formulated is firstly solved in closed form for a single-NLoS-link scenario, then we harness the popular successive convex approximation (SCA) method for a general multiple-NLoS-link scenario. Our simulation results characterize the fundamental performance tradeoffs between sensing and communication, demonstrating that the available DoFs in the ISAC channel should be efficiently exploited in a way that is distinctly different from that of communication-only scenarios.
