基于三维混合多址接入的多用户MIMO可见光通信系统研究

多输入多输出（MIMO）技术能够有效提高基于LED的可见光通信（VLC）系统的传输速率，近年来MIMO-VLC受到了国内外学者的广泛关注。MIMO传输给多用户VLC系统的多址接入方案设计引入了新的空间维度，同时也带来了新的挑战。现有研究工作所提MIMO-VLC系统的多址接入方案主要是借鉴传统射频无线通信系统中的经典方案，并没有根据MIMO-VLC系统的空间维度特性设计出有针对性的新型多址接入方案。本项目从MIMO-VLC系统的频率、功率和空间三个维度出发，提出一种新型的三维混合多址接入方案，针对MIMO-VLC系统的不同实际应用场景及相应需求，构建基于三维混合多址接入的多用户MIMO-VLC系统框架，并重点研究实现三维混合多址接入的用户分组和功率分配两项关键技术。本项目的研究成果将对多用户MIMO-VLC系统的理论研究以及其在5G/6G通信、物联网通信等具体场景的实际应用具有重要参考意义。

Multiple-input multiple-output (MIMO) technology is capable of efficiently improving the transmission rate of LEDs-based visible light communication (VLC) systems, and hence MIMO-VLC has attracted extensive attention by researchers at home and abroad in recent years. MIMO transmission introduces a new dimension (i.e., space dimension) for multi-user VLC systems and meanwhile brings new challenges. The existing multiple access schemes proposed for MIMO-VLC systems are mostly based on the classical schemes in conventional radio frequency communication systems, and the unique space-dimension characteristics of MIMO-VLC systems have not yet been exploited for the design of novel multiple access schemes. Our project takes the three available dimensions (i.e., frequency, power and space) of MIMO-VLC systems into consideration and proposes a novel hybrid three-dimensional multiple access (3DMA) scheme for MIMO-VLC systems. We first build a framework of the hybrid 3DMA-based multi-user MIMO-VLC system by considering its practical application scenarios and the corresponding requirements. Then, we focus on the investigation of two key techniques to implement the hybrid 3DMA scheme in multi-user MIMO-VLC systems, including user grouping and power allocation. The research results of this project will have a great significance on the theoretical study of multi-user MIMO-VLC systems and their practical application in scenarios such as 5G/6G communications and Internet of things (IoT) communications.