Rate-Splitting Multiple Access (RSMA) is an emerging flexible and powerful multiple access for downlink multiantenna networks. In this paper, we introduce the concept of RSMA into short-packet downlink communications. We design optimal linear precoders that maximize the sum rate with Finite Blocklength (FBL) constraints. The relations between the sum rate and blocklength of RSMA are investigated for a wide range of network loads and user deployments. Numerical results demonstrate that RSMA can achieve the same transmission rate as Non-Orthogonal Multiple Access (NOMA) and Space Division Multiple Access (SDMA) with shorter blocklengths (and therefore lower latency), especially in overloaded multi-antenna networks. Hence, we conclude that RSMA is a promising multiple access for low-latency communications.
翻译:在本文中,我们将RSMA的概念引入短包装下行通信中,我们设计了最佳线性预译器,以尽量扩大使用Finite 区长限制(FBL)的总和率;对RSMA的总和率和区块长度之间的关系进行了广泛网络负荷和用户部署的调查;数字结果显示,RSMA可以实现与非正统多重接入(NOMA)和空间司多端接入(SDMA)相同的传输率,其轮廓长度较短(因而是低长),特别是在超载的多层连接网络中。因此,我们得出结论,RSMA是低延迟通信的有希望的多重接入。