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中文摘要：
为了保证光突发交换（OBS）网络中业务高可靠性的同时,降低突发的端到端的时延,提出了一种基于不规则重复积累（IRA）码的突发编码机制.对IRA码校验矩阵结构进行了一定的调整,得到一种能对突发进行在线编解码的在线不规则重复累积（OL-IRA）码.利用OL-IRA码对信息突发进行编码,以便用产生的冗余突发来恢复丢失的信息突发.仿真结果表明,OL-IRA码在保证恢复丢包能力的同时,也能明显缩短丢包恢复的时延.
英文摘要：
In order to guarantee high reliable service in optical burst switching（OBS） networks and re- duce the end-to-end delay of bursts, an online burst encoding mechanism based on irregular repeat accu- mulate（IRA） codes was proposed. The parity-check matrix of IRA codes was adjusted into a special structure, and then an on line IRA （OL-IRA） code which can encode and decode burst online was con- structed. Information data bursts are encoded by OL-IRA codes to recover lost bursts with redundant bursts. Simulations show that OL-IRA codes will guarantee the performance of burst loss recovery, and can also shorten the delay of burst loss recovery.
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