论文标题
单用户RIS系统的最佳SNR分析
Optimal SNR Analysis for Single-user RIS Systems
论文作者
论文摘要
在本文中，我们介绍了SIMO可重构智能表面（RIS）辅助无线链接的最佳上行链路SNR的分析。我们假设基站和RIS之间的通道是级别-1 LOS通道，而用户（UE）-RIS和UE-Base站（BS）通道是相关的Rayleigh。我们得出平均SNR的精确闭合形式表达式，以及SNR方差的近似值，从而导致对UL SNR分布的精确伽马近似。此外，我们通过分析表征了相关性对SNR的影响，表明UE-BS通道中的相关性可能对平均SNR产生负面影响，而UE-RIS通道中的相关性可改善系统性能。对于具有大量RIS元素的系统，UE-RIS通道中的相关性可能会导致相对于不相关的通道的平均SNR的增加高达27.32％。
In this paper, we present an analysis of the optimal uplink SNR of a SIMO Reconfigurable Intelligent Surface (RIS)-aided wireless link. We assume that the channel between base station and RIS is a rank-1 LOS channel while the user (UE)-RIS and UE-base station (BS) channels are correlated Rayleigh. We derive an exact closed form expression for the mean SNR and an approximation for the SNR variance leading to an accurate gamma approximation to the distribution of the UL SNR. Furthermore, we analytically characterise the effects of correlation on SNR, showing that correlation in the UE-BS channel can have negative effects on the mean SNR, while correlation in the UE-RIS channel improves system performance. For systems with a large number of RIS elements, correlation in the UE-RIS channel can cause an increase in the mean SNR of up to 27.32% relative to an uncorrelated channel.
