光突发交换网络中基于LDPC码的丢包恢复机制(英文)  

Research on Burst Loss Recovery Based on LDPC Codes in Optical Burst Switching Networks

作　　者：黄胜[1] 李佳良[1] 张春明[1] 杨晓非[1] 

机构地区：[1]重庆邮电大学光纤通信重点实验室,重庆400065

出　　处：《光子学报》2014年第7期138-143,共6页Acta Photonica Sinica

基　　金：The National Natural Science Foundation of China(Nos.61071117,61171158,61275077);the Natural Science Foundation Project of CQ CSTC(Nos.cstc2013jcyjA40052,cstc2012jjA40060);the Projects of the Education Council of Chongqing(No.KJ130515)

摘　　要：基于前向纠错编码理论,在光突发交换网络中提出一种丢包恢复机制来降低突发丢失率.构造了一种能对突发包进行在线编解码的低密度奇偶校验码.入口边缘节点通过对信息突发包进行在线编码产生冗余突发包,出口边缘节点利用译码算法从接收到的突发包中恢复出丢失的突发数据.另外,为信息突发包增加一个额外的偏置时间以减少冗余突发与信息突发竞争信道资源.通过OPNET仿真软件对不同丢包恢复机制的性能进行仿真,结果表明,与奇偶校验码提出的丢包恢复机制相比,具有更低的突发丢失率和良好的丢包恢复能力.A burst loss recovery mechanism based on forward frror correction was proposed to reduce burst loss probability in optical burst switching networks. A new low-density parity-check code was designed to encode and decode bursts online. In the ingress node, encoder generated redundant bursts by encoding information bursts, and in egress node, decoding algorithm was used for recovering lost bursts. For redundant bursts contended with information bursts for wavelength resource and that may result in large information bursts loss, extra-offset time was added for information burst. The performance of different burst loss recovery mechanism was investigated by OPNET simulation software, the results show that the burst loss recovery mechanism can reduce burst loss probability more efficiently compared with pairty- check codes. Therefore, the mechanism is provided with good capability of burst loss recovery.

关 键 词：光突发交换 低密度奇偶校验码 丢包恢复 在线 额外偏置时间 

分 类 号：TN929.11[电子电信—通信与信息系统]