Motivated by the challenges of future 6G communications where terahertz (THz) frequencies, intelligent reflective surfaces (IRSs) and ultra-wideband (UWB) signals coexist, we analyse and propose a set of efficient techniques for configuring the IRS when the signal bandwidth is a significant fraction of the central frequency (up to 50%). To the best of our knowledge this is the first time that IRS configuration techniques are analyzed for such huge bandwidths. In our work we take into account for the channel model, the power spectral density of the signal reflected by the IRS and the network geometry. We evaluate the proposed solutions in terms of achievable rate and compare it against an upper bound we derived. Our results hint rules for designing IRS-aided communication systems and allow to draw conclusions on the trade-off between performance and complexity required for configuring the IRS.

翻译：受未来6G通信中太赫兹频率、智能反射面（IRS）与超宽带（UWB）信号共存挑战的驱动，本文分析并提出了一系列高效配置IRS的技术方案，适用于信号带宽占中心频率较大比例（高达50%）的场景。据我们所知，这是首次针对如此超宽带场景开展IRS配置技术分析。研究中综合考虑了信道模型、IRS反射信号的功率谱密度以及网络几何结构。我们通过可达速率对所提方案进行评估，并与推导出的理论上限进行比较。研究结果揭示了设计IRS辅助通信系统的指导原则，并得出了关于配置IRS所需性能与复杂度之间权衡的结论。