Differential Decoupling Strategies for UWB Integrated Sensing and Communication Systems

Ultra wideband (UWB) signals, with their high time resolution, large bandwidth, and low energy consumption, hold great promise as candidates for future integrated sensing and communication (ISAC) systems. In this article, we attempt to explore the tradeoff between communication and sensing by estimating the unknown parameters of transmitted symbols and channel characteristics. We utilize the Fisher Information Matrix (FIM) and Cramr-Rao Bound (CRB) to quantify the performance. Firstly, due to the coupling between channel parameters and transmitted symbols, a differential decoupling approach is proposed. Subsequently, we conducted a comparative analysis of sensing performance across various decoupling methods. We can see that the transmitted symbols have noticeable degrading effects under typical channel parameters. Numerical results are provided, to show the decouple performance degradation on different decoupling schemes.