This paper unifies integrated sensing and communication (ISAC) and simultaneous wireless information and power transfer (SWIPT), by investigating a new multi-functional multiple-input multiple-output (MIMO) system integrating wireless sensing, communication, and powering. In this system, one multi-antenna hybrid access point (H-AP) transmits wireless signals to communicate with one multi-antenna information decoding (ID) receiver, wirelessly charge one multi-antenna energy harvesting (EH) receiver, and perform radar sensing for a point target based on the echo signal at the same time. Under this setup, we aim to reveal the fundamental performance tradeoff limits of sensing, communication, and powering, in terms of the estimation Cram{\'e}r-Rao bound (CRB), achievable communication rate, and harvested energy level, respectively. Towards this end, we define the achievable CRB-rate-energy (C-R-E) region and characterize its Pareto boundary by maximizing the achievable rate at the ID receiver, subject to the estimation CRB requirement for target sensing, the harvested energy requirement at the EH receiver, and the maximum transmit power constraint at the H-AP. We obtain the semi-closed-form optimal transmit covariance solution to the formulated problem by applying advanced convex optimization techniques. Numerical results show the optimal C-R-E region boundary achieved by our proposed design, as compared to the benchmark scheme based on time switching.
翻译:本文统一了综合遥感和通信(ISAC)以及同时的无线信息和电力传输(SWIPT),方法是调查一个新的多功能多投入多输出多输出(MIIMO)系统,结合无线遥感、通信和供电。在这个系统中,一个多联苯混合接入点(H-AP)传输无线信号,与一个多联苯信息解码接收器(ID)进行通信,无线充电一个多连接能源采集接收器,对一个点目标进行雷达检测,同时根据回声信号进行点目标检测。在这个设置下,我们的目标是从估算Cram e'e'r-Rao绑定(CRB)、可实现的通信速率和收获的能源水平中,分别揭示遥感、通信和动力的基本性差差差差差差差差差值。我们为此确定了可实现的CRB-节节节节节节能区域,根据CRB对目标测的估算,在EH-R接收器接收器中,在对E-R-R-Rlestal-restial 将最佳设计方法应用最佳设计方法,通过我们最佳的C-C-stal-stal-stal 将最佳的节压办法,通过最佳的节制传递到最佳的节能解决方案,通过最佳的节制传递。