高频谱效率/动态可重构的光码分多址技术研究

OCDMA通信具有软容量、异步灵活接入、内在安全性、网络管理简单等特点，必将成为未来宽带接入网和抗截获通信的重要手段。本课题针对现有全光编解码OCDMA系统无法跨中继应用、多址干扰和光纤色散影响严重的问题，研究精确描述OCDMA系统干扰噪声的信道模型，从而针对OCDMA信道提供数字域可实现的动态可重构均衡方法；研究抑制多址干扰的脉冲接收机数字域实现方法；研究与波分复用WDM相兼容的高频谱效率编解码方法。预期提出基于OCDMA精确信道模型的动态色散补偿算法；提出编码带宽<30GHz、总频谱利用率>1bit/s/Hz的OCDMA编解码方案；搭建一套采用数字相干接收机的多用户OCDMA系统实验平台，得到系统性能随用户数、频谱效率和传输距离的变化关系；预期发表高水平学术论文14篇、申请国家发明和国防专利3-5项、培养博士研究生2名、硕士研究生4名；为OCDMA宽带接入与抗截获通信应用提供数字解决。

Optical Code Division Mltiple-access (OCDMA) has such advantages as soft capability, flexibly asynchronous access, inherent security, simple network manangement,therefore, it is a promising method for future wide-bandwidth optical access network and anti-interception communication system. Aiming at problems of all optical processing OCDMA systems such as unable to penetrate a regenerator,severe muti-address interference(MAI) and impact of fiber chromatic dispersion, following researching works will be carried out: 1)Researching the channel model accuratly describing interferences as well as noises in OCDMA system, so as to provide a dynamic reconfigrable digital equalization methold. 2)Researching pulse receiver's digital realiztion method to suppres MAI. 3)Researching high spectrum efficiency encoding/decoding methold to compatible with wavelength divided multiplexing(WDM) network. It is anticipated as following after this project:1)To provide a dynamic dispersion compensation algorithm based on an accurate OCDMA channel model. 2)To give an encoding scheme with totle coefficient of spectrum utilization beyond 1bit/s/Hz within the bandwith of 30GHz. 3)To set up a multi-user OCDMA sytem experiment platform with digital coherent reciever, to get system performance variation with users' number, coefficient of spectrum utilization and transmission length. 4)To publish more than 14 high level academic papers, to apply for 3-5 national and defensive patents, to bring up 2 Ph.D and 4 master students. 5)To provide digital OCDMA solutions for wide bandwith access network and anti-interception communication.