论文标题
速率分类的多个访问物质的蜂窝互联网
Rate-Splitting Multiple Access for Overloaded Cellular Internet of Things
论文作者
论文摘要
在不久的将来，人们可以想象，蜂窝网络将不得不应对广泛的物联网（IoT）设备。因此，细胞IoT的必要特征将是同时在发射机（CSIT）上同时提供具有频道状态信息异质需求和质量的大量设备。在本文中，我们专注于具有两组CSIT品质的超载多输入单输出（MISO）广播频道（BC），即一组用户（代表高端设备的代表），发射器对CSI具有部分知识，对这些用户（代表IOT decections of Thressive of Transmosters of Transmosters of Transmoster of Transmosters of Tellmaster oversloce of the Sittersitions CSI都有知识。我们引入了速率分类的多重访问（RSMA），这是一种基于多个Antenna速率分解（RS）的新多次访问，用于细胞IoT。提出了两种策略，即时间分配RSMA（TP-RSMA）和功率分配RSMA（PP-RSMA）。前者在正交时段内独立为两组用户提供服务，而后者则以非正交方式共同为两组用户服务。我们首先以高信噪比（SNR）表明PP-RSMA在具有异质性CSIT质量的超载Miso BC中达到了最佳的自由度（DOF），然后在有限的SNR上表明，通过嫁给PP-RSMA，PP-RSMA的好处，PP-RSMA的益处和BASELES SCHELES explal Schem and baseal and base and top tp-rs and top rs tosma and base and tosma。此外，PP-RSMA对于不准确而强大，并且可以灵活地应对所有用户的服务质量（QoS）速率约束。 DOF和速率分析有助于我们得出一个结论，即PP-RSMA是具有大量设备的细胞IoT的强大框架。
In the near future, it is envisioned that cellular networks will have to cope with extensive Internet of Things (IoT) devices. Therefore, a required feature of cellular IoT will be the capability to serve simultaneously a large number of devices with heterogeneous demands and qualities of Channel State Information at the Transmitter (CSIT). In this paper, we focus on an overloaded Multiple-Input Single-Output (MISO) Broadcast Channel (BC) with two groups of CSIT qualities, namely one group of users (representative of high-end devices) for which the transmitter has partial knowledge of the CSI, the other group of users (representative of IoT devices) for which the transmitter only has knowledge of the statistical CSI. We introduce Rate-Splitting Multiple Access (RSMA), a new multiple access based on multi-antenna Rate-Splitting (RS) for cellular IoT. Two strategies are proposed, namely, Time Partitioning-RSMA (TP-RSMA) and Power Partitioning-RSMA (PP-RSMA). The former independently serves the two groups of users over orthogonal time slots while the latter jointly serves the two groups of users within the same time slot in a non-orthogonal manner. We first show at high Signal-to-Noise Ratio (SNR) that PP-RSMA achieves the optimum Degrees-of-Freedom (DoF) in an overloaded MISO BC with heterogeneous CSIT qualities and then show at finite SNR that, by marrying the benefits of PP and RSMA, PP-RSMA achieves explicit sum rate gain over TP-RSMA and all baseline schemes. Furthermore, PP-RSMA is robust to CSIT inaccuracy and flexible to cope with Quality of Service (QoS) rate constraints of all users. The DoF and rate analysis helps us draw the conclusion that PP-RSMA is a powerful framework for cellular IoT with a large number of devices.
