Quantifying the performance bound of an integrated localization and communication (ILAC) system and the trade-off between communication and localization performance is critical. In this letter, we consider an ILAC system that can perform communication and localization via time-domain or frequency-domain resource allocation. We develop an analytical framework to derive the closed-form expression of the capacity loss versus localization Cramer-Rao lower bound (CRB) loss via time-domain and frequency-domain resource allocation. Simulation results validate the analytical model and demonstrate that frequency-domain resource allocation is preferable in scenarios with a smaller number of antennas at the next generation nodeB (gNB) and a larger distance between user equipment (UE) and gNB, while time-domain resource allocation is preferable in scenarios with a larger number of antennas and smaller distance between UE and the gNB.

翻译：量化集成定位与通信（ILAC）系统的性能界以及通信与定位性能之间的权衡至关重要。本文考虑一个可通过时域或频域资源分配实现通信与定位的ILAC系统。我们开发了一个解析框架，通过时域与频域资源分配，推导出容量损失与定位克拉美-罗下界（CRB）损失的闭式表达式。仿真结果验证了该解析模型，并表明：在下一代基站（gNB）天线数量较少且用户设备（UE）与gNB距离较大的场景中，频域资源分配更优；而在天线数量较多且UE与gNB距离较小的场景中，时域资源分配更优。