This letter explores a reconfigurable intelligent surfaces (RISs) assisted multi-user ultra-reliable low-latency communication (URLLC) system in presence of electromagnetic interference (EMI). The spatial correlation among the channels corresponding to the RIS meta-atoms is considered. For downlink communication, source selects a user out of arbitrary ${K}$ users through random or absolute channel power based (CPB) scheduling schemes. We derive the closed form expressions for outage probability, block error rate (BLER), capacity and system goodput for both the scheduling schemes under the assumption of imperfect channel state information (CSI). Moreover, asymptotic expression for outage probability is also derived. The correctness of the derived expressions is verified through Monte-Carlo simulations.

中文翻译：

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空间相关 RIS 信道和电磁干扰下的下行 URLLC 系统

这封信探讨了在存在电磁干扰 (EMI) 的情况下，可重构智能表面 (RIS) 辅助多用户超可靠低延迟通信 (URLLC) 系统。考虑了对应于RIS元原子的通道之间的空间相关性。对于下行通信，源从任意一个用户中选择一个用户 ${K}$用户通过随机或基于绝对信道功率 (CPB) 的调度方案。在不完美信道状态信息（CSI）的假设下，我们推导出了两种调度方案的中断概率、误块率（BLER）、容量和系统吞吐量的封闭式表达式。此外，还导出了中断概率的渐近表达式。通过蒙特卡罗模拟验证了导出表达式的正确性。