Impact of Correlated Fading on Multi-Connectivity
Impact of Correlated Fading on Multi-Connectivity
复制标题
相关衰落对多连接的影响
DOI：
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发表时间：
2021
影响因子：
10.4
通讯作者：
G. Fettweis
中科院分区：
文献类型：
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作者：
Yuh;Albrecht Wolf;Meik Dörpinghaus;J. Filho;G. Fettweis
多连接（MC）被认为是满足第五代网络超可靠低延迟通信要求的关键特征之一，因为它提供多个分集分支。最近，我们评估了各种MC设置和不同的组合算法的解码可靠性，通过分析所产生的中断概率。在这项工作中，我们感兴趣的是有多少性能受到相关衰落。具体来说，我们分析了MC系统的中断概率与联合解码接收相关准静态瑞利和Nakagami- ${m}$衰落信道上操作。我们的主要贡献是：（i）推导了精确中断概率的积分形式和高信噪比下的渐近中断概率的封闭形式，（ii）推导了相关损耗，它量化了相关衰落下相对于独立衰落所需的额外信噪比;以及（iii）通过蒙特-卡罗模拟评估准循环低密度奇偶校验码的误帧率。我们的研究结果表明，相关性损失是边际的低到中等水平的相关性，而分集增益是不受相关性。此外，我们发现，相关损失是独立的Nakagami- ${m}$衰落参数封装的自由度。
Multi-connectivity (MC) is regarded as one of the key features that meet the requirements of ultra-reliable low-latency communications for 5th generation networks, as it provides multiple diversity branches. Recently, we evaluated the decoding reliability of various MC setups and different combining algorithms by analyzing the resulting outage probabilities. In this work, we are interested in how much the performance is affected by correlated fading. Specifically, we analyze the outage probability of MC systems with joint decoding reception operating over correlated quasi-static Rayleigh and Nakagami- ${m}$ fading channels. Our main contributions are as follows: (i) deriving the exact outage probability in integral form and the asymptotic outage probability at high signal-to-noise ratio (SNR) in closed form; (ii) deriving the correlation loss, which quantifies the extra SNR required under correlated fading as compared with the independent scenario; and (iii) evaluating frame-error rates of quasi-cyclic low-density parity-check codes by Monte-Carlo simulations. Our results show that the correlation loss is marginal for a low to moderate level of correlation, whereas the diversity gain is not affected by correlation whatsoever. Furthermore, we find that the correlation loss is independent of the degrees of freedom encapsulated by the Nakagami- ${m}$ fading parameter.