The implementation of the \ac{isac} feature in \ac{6g} networks is most likely to be based on the framework of \ac{ofdm}. Input distribution design, or constellation design, is a crucial technique in \ac{ofdm}-\ac{isac} systems enabling a favorable balance between communication rate and sensing performance. In this treatise, we propose a computationally efficient input distribution design approach for \ac{ofdm}-\ac{isac} under frequency-selective channels, following the theoretical framework of capacity distortion. We highlight that under practical sensing constraints, the optimal strategy is to treat the kurtosis of constellations as a resource, and allocate it appropriately over subcarriers.

翻译：在第六代（6G）网络中实现集成感知与通信（ISAC）功能最可能基于正交频分复用（OFDM）框架。输入分布设计（即星座图设计）是OFDM-ISAC系统中实现通信速率与感知性能平衡的关键技术。本文基于容量失真理论框架，提出了一种适用于频率选择性信道下OFDM-ISAC的高效计算型输入分布设计方法。我们指出，在实际感知约束条件下，最优策略是将星座图的峰度视为一种资源，并在子载波上进行合理分配。