自适应非饱和OFDM多模光纤通信技术研究

项目名称： 自适应非饱和OFDM多模光纤通信技术研究

项目编号： No.61077054

项目类型： 面上项目

立项/批准年度： 2011

项目学科： 无线电电子学、电信技术

项目作者： 胡贵军

作者单位： 吉林大学

项目金额： 15万元

中文摘要： 基于正交频分复用（OFDM）的多模光纤通信技术能够克服多模光纤信道的频率选择特性，很好地利用多模光纤的高频带通区域进行大容量信息传输。该技术可以有效降低光纤接入网的成本，从而解决目前高速接入与高网络成本之间的矛盾，加快光纤到户等短距离光网络的进程。在本项目的资助下，我们提出了一种自适应非饱和OFDM技术，通过调整IFFT变换点数开辟新的子载波信道，为分配给差子载波信道的传输信息提供重新分配的信道资源，较好地解决了多模光纤高频带通区域深度衰落点导致系统性能下降这一科学问题，从而有效利用多模光纤的带通区域，实现大容量信息传输，提高了多模光纤传输能力。本项目研究了多模光纤的信道特性，特别是其高频带通区域的传输特性；研究了非饱和OFDM的实现机理，提出了自适应非饱和OFDM的实现方案；提出了三种适合多模光纤信道的自适应比特分配算法，并进行了性能对比分析；在Optisystem环境下，对自适应非饱和OFDM技术的实现方案进行了验证，结果表明，我们提出的自适应非饱和方案是完全可行的，可以实现10Gb/s信号1km的有效传输，误码率优于1e-9。

中文关键词： 多模光纤通信；非饱和正交频分复用；深度衰落点；频率选择信道

英文摘要： The frequency-selective feature of multimode fiber can be overcomed by Orthogonal Frequency Division Multiplexing (OFDM) which can effectively explore the band-pass regions in the high frequency regions of multimode fiber to achieve high capacity transmission. The technology can dramatically reduce the cost of access network to make a balance between high-speed and high-cost at present, and accelerate the developing progress of short reach optical network like Fiber To The Home (FTTH).Under the support of the foundation, we proposed an adaptive unsaturated OFDM technology by adjusting the IFFT transformation points to create new subcarrier channels ,which can provide new redistributed channels for the information previously transmitted by the poor subcarrier channels. It is a good solution to resolve the problem that the system performance decreases because of some subcarriers located at or near the deep nulls in high frequency regions of multimode fiber. The proposed technology can utilize the band-pass regions effectively to achieve high capacity transmission and improve the transmission capacity of multimode fiber. In this project, we researched the channel characteristics of multimode fiber especially the transmission characteristics of high frequency regions and researched the mechanism of unsaturated OFDM, proposed the implementation for adaptive unsaturated OFDM, proposed three bit allocation algorithms that are suitable for multimode fiber channels and compared the performance of the three algorithms. In Optisystem simulation environment, we verified the the implementation for adaptive unsaturated OFDM. The results showe that the adaptive unsaturated OFDM technology we proposed is feasible and can accomplish transmission 10Gb/s data over 1km multimode fiber with the BER better than 1e-9.

英文关键词： Multimode Fiber Communication; Unsaturated OFDM; Deep Null; Frequency-selective Channel