基于IM/DD的无线光通信网络容量域研究

无线光通信网络普遍以光强度为信息载体，采用强度调制/直接检测（Intensity Modulation and Direct Detection, IM/DD）的传输方式。这导致无线光通信网络的信号和信道模型与传统无线通信网络有重要的区别，无线通信网络中的经典理论结果与分析设计方法无法直接适用于无线光通信网络。鉴于此，本项目拟从网络信息论角度，开展针对基于IM/DD的无线光通信网络的理论研究。通过建立合理的网络信道模型，提出新型的容量域分析方法，刻画容量域的一般性内界与外界。基于所求容量域结果，分析在高信噪比和低信噪比条件下的渐近信道容量域，描述与容量域边界对应的输入概率分布的相关特性，分析正交频分多址、非正交多址等不同通信模式下网络实际可达速率域。项目选题取自无线光通信网络的基础性问题，有望得到兼具理论意义和实用价值的成果，为无线光通信网络系统设计提供理论依据与参考。

Wireless optical communication networks generally modulate optical light intensity to carry information, and convey information by intensity modulation and Direct Detection (IM/DD). This leads to significant differences between the signal and channel model of optical wireless communication networks and traditional wireless communication networks. The classical theoretical results and analysis methods in wireless communication networks cannot be directly applied to the wireless optical communication network. In view of this, this project aims to carry out theoretical research on typical wireless optical communication networks based on IM/DD from the perspective of network information theory. By precisely establishing network channel model, we propose new methods to analyze capacity region, and describe general inner and outer bounds of the capacity domain region. Based on the results of capacity region, we further analyze the exact asymptotic capacity region in both high signal-to-noise ratio (SNR) and low SNR regimes, describe the relevant characteristics of the input distribution corresponding to the boundary of the capacity region, and describe the achievable rate region of different communication modes such as non-orthogonal multiple access, and orthogonal frequency division multiple access. The topic of the project is selected from the basic issues of optical wireless communication networks, and its expected results can provide theoretical foundation and support for optical wireless communication networks.