文档介绍：非相干光CDMA系统的编解码方案研究
摘要
光码分多址充分利用了光的频谱资源,适合局域网中突发流量、大流量和高速率环境,动态分配带宽,网络易于扩展。与光时分多址(OTDMA),波分多址(WDMA)等多址技术相比,光码分多址(OCDMA)技术凭借其高安全保密性,软容量,支持异步接入,并且直接进行光编码和光解码,网络中没有电节点,能真正实现在光层上的传输和交换,利于突破“电子瓶颈”效应,构成超高速率、超大容量的全光系统和网络,吸引了越来越多人的注意和研究,并被认为在未来的光网络,特别是光接入网中具有巨大的发展潜力。是实现未来全光通信网络的重要技术之一。
本文介绍了光通信中三种复用方式的应用,对OCDMA技术的优点和其他三种复用方式的特点作了比较和归纳总结。重点对OCDMA系统的编解码方法,编解码器的构造和工作原理,以及接收检测部分作了理论分析。提出了新型的更有效率的编码方案,最后对OCDMA技术进行了展望总结。
关键词: 光码分多址(OCDMA);编解码器;素数码;光正交码
NON-COHERENT OPTICAL CDMA SYSTEM CODEC RESEARCH
ABSTRACT
Current optical work is bothered by the electrical bottle-neck effect. Optical code division multiplexing technique tries to e this problem by taking use of optical encoding and decoding to realize optical channel multiplexing without switching. This technique can increase the data transference speed greatly. And it has evolved into many variations, ., Optical Time Division Multiple Access (OTDMA), Wave Division Multiple Access (WDMA) and Optical Code Division Multiple Access (OCDMA). OCDMA is considered as the most promising method for its advantages, such as high security, work management, etc.
This paper pares the mon multiplexing techniques, which are OTDMA, WDMA and OCDMA. Then the paper mainly describes the basic theory, existing problems and current applications of multiplexing techniques. OCDMA is the focus of this paper. Its working mechanism and implementation method are presented in this paper. And an improved version of OCDMA is proposed. Finally the paper discussed the future of OCDMA.
Key words: OCDMA; encoder/decoder; Prime code; Optical orthogonal code
目录
1 绪论……………………………………………………………………………………….1
光通信发展回顾……………………………………………………………………..1
光通信中的复用多址方式…………………………………………………………..2
光时分多址(OTDMA)技术………………………………………………2
波分多址(WDMA)技术…………………………………………………..4
光码分多址(OCDMA)技术………………………………………………4
OCDMA技术发展及研究现状……………………………………………………...5
课题主要研究方法…………………………………………………………………..6
本文主要研究内容…………………………………………………………………..6
2 OCDMA系统编解码关键技术……