Rate-Splitting Multiple Access：在MISO VLC通道中统一NOMA和SDMA
Rate-Splitting Multiple Access: Unifying NOMA and SDMA in MISO VLC Channels
摘要：
连接设备的增加扩散需要向下一代无线系统的创新技术的开发进行范式转变。然而，由于近年来前所未有的宽带普及率，频谱稀缺是一个关键挑战。可见光通信（VLC）最近已经成为实现高速短距离通信的可能解决方案。然而，VLC系统受到若干限制，包括发光二极管的有限调制带宽。因此，几种多址接入技术（MA），例如，空分多址（SDMA）和非正交多址接入（NOMA）已经被考虑用于VLC网络。尽管他们有前途的多路复用增益，他们的性能是有限的。在本文中，我们首先概述了VLC系统中使用的关键MA技术。然后，我们介绍了速率分裂多址接入（RSMA），这是最初提出的射频系统，并讨论了它在VLC系统的潜力。通过基于RSMA的两种使用场景的系统建模和仿真，我们说明了RSMA在推广NOMA和SDMA方面的灵活性，以及其在VLC中的加权和速率（WSR）方面的优越性。最后，我们讨论的挑战，开放的问题，和研究方向，这将使实际实现的VLC中的RSMA。
英文摘要：
The increased proliferation of connected devices requires a paradigm shift towards the development of innovative technologies for the next generation of wireless systems. One of the key challenges, however, is the spectrum scarcity, owing to the unprecedented broadband penetration rate in recent years. Visible light communications (VLC) has recently emerged as a possible solution to enable high-speed short-range communications. However, VLC systems suffer from several limitations, including the limited modulation bandwidth of light-emitting diodes. Consequently, several multiple access techniques (MA), e.g., space-division multiple access (SDMA) and non-orthogonal multiple access (NOMA), have been considered for VLC networks. Despite their promising multiplexing gains, their performance is somewhat limited. In this article, we first provide an overview of the key MA technologies used in VLC systems. Then, we introduce rate-splitting multiple access (RSMA), which was initially proposed for RF systems and discuss its potentials in VLC systems. Through system modeling and simulations of an RSMA-based two-use scenario, we illustrate the flexibility of RSMA in generalizing NOMA and SDMA, as well as its superiority in terms of weighted sum rate (WSR) in VLC. Finally, we discuss challenges, open issues, and research directions, which will enable the practical realization of RSMA in VLC.
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