Optimization of the Downlink Spectral- and Energy-Efficiency of RIS-aided Multi-user URLLC MIMO Systems
CoRR(2024)
摘要
Modern wireless communication systems are expected to provide improved
latency and reliability. To meet these expectations, a short packet length is
needed, which makes the first-order Shannon rate an inaccurate performance
metric for such communication systems. A more accurate approximation of the
achievable rates of finite-block-length (FBL) coding regimes is known as the
normal approximation (NA). It is therefore of substantial interest to study the
optimization of the FBL rate in multi-user multiple-input multiple-output
(MIMO) systems, in which each user may transmit and/or receive multiple data
streams. Hence, we formulate a general optimization problem for improving the
spectral and energy efficiency of multi-user MIMO-aided ultra-reliable
low-latency communication (URLLC) systems, which are assisted by reconfigurable
intelligent surfaces (RISs). We show that a RIS is capable of substantially
improving the performance of multi-user MIMO-aided URLLC systems. Moreover, the
benefits of RIS increase as the packet length and/or the tolerable bit error
rate are reduced. This reveals that RISs can be even more beneficial in URLLC
systems for improving the FBL rates than in conventional systems approaching
Shannon rates.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要