论文标题
具有功率分配的大型MIMO系统中下行链路URLLC的中断分析
Outage Analysis of Downlink URLLC in Massive MIMO systems with Power Allocation
论文作者
论文摘要
由于其高空间自由度，大型的MIMO被视为低潜伏期通信的主要推动者。大量MIMO的通道硬化和有利的传播特性对于多元化的多个URLLC设备尤为重要。但是，通道硬化和空间多路复用的实际效用取决于通道知识的准确性。当几个低延迟设备被多重地使用时，获取准确知识的成本变得至关重要，而且尚不清楚可以使用延迟可重复性要求提供多少个设备，以及应分配多少个试点符号。本文通过采用各种功率分配策略，最大比率和最小均方根误差预编码器来调查实现高光谱效率和下行链路可靠性高可靠性之间的权衡。结果表明，使用Max-Min SINR功率分配可实现最佳的可靠性，而牺牲了较低的频谱效率。
Massive MIMO is seen as a main enabler for low latency communications, thanks to its high spatial degrees of freedom. The channel hardening and favorable propagation properties of Massive MIMO are particularly important for multiplexing several URLLC devices. However, the actual utility of channel hardening and spatial multiplexing is dependent critically on the accuracy of channel knowledge. When several low latency devices are multiplexed, the cost for acquiring accurate knowledge becomes critical, and it is not evident how many devices can be served with a latency-reliability requirement and how many pilot symbols should be allocated. This paper investigates the trade-off between achieving high spectral efficiency and high reliability in the downlink, by employing various power allocation strategies, for maximum ratio and minimum mean square error precoders. The results show that using max-min SINR power allocation achieves the best reliability, at the expense of lower sum spectral efficiency.
