照明约束下的直流携信可见光通信系统设计与性能研究

项目名称： 照明约束下的直流携信可见光通信系统设计与性能研究

项目编号： No.61501420

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 高谦

作者单位： 中国科学技术大学

项目金额： 21万元

中文摘要： 近年来，可见光通信正逐步成为传统射频通信重要的补充方案，其中基于高阶正交频分复用的传输系统在高速、高频谱利用率传输方面获得了长足进展。然而，基于传统调制方案的系统能量利用率较低，主要原因是直流能耗比例大，但其不携带信息造成浪费。另外，子载波在低维欧式空间独立调制也导致能效瓶颈。除了提高能效的迫切需求，如何在高效通信的同时满足照明的要求，即实现通信照明一体化也面临诸多挑战。针对这些挑战，本项目运用优化理论、矩阵分析理论和随机过程理论，设计并深入研究符合照明约束的高能效调制解调方案、星座图映射方案、预编码方案等，在时频色联合域分别设计基于直流携带信息的多载波高维联合调制系统，大幅度提高可见光通信能量效率。同时构建系统实验验证平台，研究照明性能与通信性能的相互制约关系。本研究有助于取得理论和关键技术的自主创新。

中文关键词： 可见光通信；高维联合调制；直流携信调制；通照一体化；信道容量

英文摘要： Visible light communication (VLC) has recently taken an important complementary role to the conventional radio frequency communications. Notably, high spectral-efficiency and communication rate are achievable leveraging high order modulation and orthogonal freqency division multiplexing. However, these systems suffer from low energy-efficiency, due to the adoption of non-informative DC, where non-trivial portion of energy is not utilized for communication. Also, independent low-dimensional constellations are applied with conventional methods, resulting in lower energy-efficiency. Besides energy-efficiency, it is also challenging while necessary to consider lighting requirements, i.e. to coherently integrate communication and illumination. In this proposal, we seek to increase the energy-efficiency of VLC systems leveraging DC-informative modulation in high-dimensional Euclidean space, jointly in time, frequency and color domains. Also, we propose methods optimizing bit-to-symbol mapping, precoding, etc. based on advanced mathematical tools such as nonlinear programming, matrix analysis theory, and stochastic process theory. An experimental testbed will be built to reveal mutual effects of lighting and communication. Completion of this project is anticipated to lead to theorectical advancements and technological innovations.

英文关键词： Visible light communications;High-dimensional joint modulation;DC-informative modulation;Communication illumination integration;Channel capacity