论文标题
ISAC的多端多播通道中的基本CRB率折衷
Fundamental CRB-Rate Tradeoff in Multi-antenna Multicast Channel with ISAC
论文作者
论文摘要
本文研究了具有集成感应和通信(ISAC)的多脉冲多播通道,其中一个多安德滕纳基站(BS)将通用消息发送给一组单人体通信用户(CUS),并通过雷达传感同时估计扩展目标的参数。我们根据可实现的通信率和传感的估计率Cramér-rao Bound(CRB)研究了该ISAC系统的基本性能限制。首先,我们以半锁定形式得出最佳的传输协方差,以平衡CRB率(C-R)权衡,并因此表征了所谓的C-R区域的外界。结果表明,最佳的传输协方差应具有全等级,包括信息携带和专用传感信号。接下来,我们考虑一个实用的联合信息和传感波束形成设计,并提出了一种有效的方法来优化关节波束以平衡C-R权衡。与其他基准方案相比,给出了数值结果,以显示通过最佳传输协方差和联合波束成形所实现的C-R区域。
This paper studies the multi-antenna multicast channel with integrated sensing and communication (ISAC), in which a multi-antenna base station (BS) sends common messages to a set of single-antenna communication users (CUs) and simultaneously estimates the parameters of an extended target via radar sensing. We investigate the fundamental performance limits of this ISAC system, in terms of the achievable rate for communication and the estimation Cramér-Rao bound (CRB) for sensing. First, we derive the optimal transmit covariance in semi-closed form to balance the CRB-rate (C-R) tradeoff, and accordingly characterize the outer bound of a so-called C-R region. It is shown that the optimal transmit covariance should be of full rank, consisting of both information-carrying and dedicated sensing signals in general. Next, we consider a practical joint information and sensing beamforming design, and propose an efficient approach to optimize the joint beamforming for balancing the C-R tradeoff. Numerical results are presented to show the C-R region achieved by the optimal transmit covariance and the joint beamforming, as compared to other benchmark schemes.