面向MDMA太赫兹系统的海量视频智能传输研究

本项目以太赫兹系统信道特性为基础，以海量视频智能传输为主线，紧紧围绕涡旋电磁波“多模态、高指向、低穿透”物理特性对视频传输的影响展开研究。主要包括：针对基于轨道角动量（OAM）的模分多址（MDMA）接入方式，研究其高频多径场景下的传输特性、信道建模、系统容量阈值等理论，并设计与其信道特性配套的智能高效信道估计方案；针对MDMA系统，设计面向传输的可分级智能视频编码方案；设计一种联合考虑OAM波传输特性、网络资源、用户体验的智能视频传输机制。有别于传统的视频传输方案，其亮点是：在高频段将基于OAM的无线通信与视频信息智能传输技术有机结合，以OAM模态作为频率、时间、空间之外的一个新自由度，借助MDMA系统的大容量优势，满足未来海量视频信息高效传输的需求。旨在通过上述研究，构建一个集接入方式、编码方案、高效传输于一体的MDMA视频信息智能传输系统，为视频信息智能传输提供理论和技术支持。

The research of this project is based on the characteristics of the terahertz system channel, with massive video intelligent transmission as the main line, and closely around the impact of vortex electromagnetic wave "multi-mode, high-pointing, low penetration" physical characteristics on video transmission. It mainly includes: for the mode division multiple access (MDMA) based on orbit angular momentum (OAM), the transmission characteristics, channel modeling, system capacity threshold and other theories in the high-frequency multipath scene are studied, and the intelligent and efficient channel estimation scheme matched with its channel characteristics is designed; for the MDMA system, the transmission oriented scalable intelligent video coding scheme is designed; an intelligent video transmission mechanism which considers the characteristics of OAM wave transmission, the limitation of network resources and the user experience is designed. Different from the traditional video transmission scheme, the highlight is that, in the high-frequency band, the wireless communication based on OAM is organically combined with the intelligent video information transmission technology, and the OAM mode is taken as a new degree of freedom outside the frequency, time and space. With the large capacity advantage of MDMA system, it can meet the demand of efficient transmission of massive video information in the future. The purpose of this project is to build an MDMA video information intelligent transmission system, which integrates access mode, coding scheme and efficient transmission, to provide theoretical and technical support for the intelligent transmission of video information.