基于非对称限幅光OFDM的紫外光通信系统研究

紫外光通信是一种新型的自由空间光通信方式，它具有保密性好、抗干扰能力强、非视距通信等优点。因此，紫外光通信已经成为国内外研究的热点之一。但由于非视距紫外光通信是基于大气散射，大气信道中存在大量的散射元，所以光信号从发射端将通过多条不同的路径在不同时间到达接收端，从而引起符号间干扰，这将会极大地限制系统的最大可用带宽。如何进一步提高紫外光通信系统的传输速率及通信质量，已经是目前亟待解决的关键问题。. 由于非对称限幅光正交频分复用技术可以采用高阶的数字调制方式，具有高的数据传输速率且均衡算法简单，同时可以有效地克服大气信道延迟产生的符号间干扰。鉴于非对称限幅光正交频分复用技术的诸多优点，本课题将其引入到紫外光通信并对其关键技术进行研究。本课题的研究成果可以用于紫外光通信、大气激光通信和光纤通信等多个应用领域。因而，本课的开展具有重要的理论意义和实际应用价值，具有广阔的应用前景。

Ultraviolet communieation is a new kind of communication Techniques in free space optics communication field. Some exeellent Performances such as safety， anti-interference， non-line-of-sight， make it different from other communication models.?Therefore, Ultraviolet communication has become one of the hot spots of domestic and foreign research.?However, because the non -line-of-sight ultraviolet communication is based on atmospheric scattering, so the optical signals from the transmitter go through a number of different paths to reach the receiving end at different times, it can cause inter symbol interference, which will greatly limit the maximum available bandwidth of the system.?How to further improve transmission rate and communication quality of the Ultraviolet communication system is a extremely problem.. Asymmetrically clipped optical OFDM with high-end digital modulation methods, high data transmission rate and simple balancing algorithm can effectively overcome inter symbol interference which the atmospheric channel delay promotes.Due to the asymmetrically clipped optical OFDM including many advantages, it will be introduced to Ultraviolet Communication and its key technologies will be analyzed.The researchs of this project can be used for Ultraviolet communications, atmospheric laser communication and fiber optic communications.Thus, the study of ptoject has to carry out important theoretical significance, practical value and broad application prospects.