系统工程与电子技术
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陈英,顾术实,焦健,李云鹤,吴绍华,张钦宇
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CHEN Ying, GU Shu-shi, JIAO Jian, LI Yun-he, WU Shao-hua, ZHANG Qin-yu
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摘要:
提出一种能够匹配多媒体业务特性的独立窗口LT码(independent window LT, IW-LT)不等差错保护方案,采用无码率LT码对不同重要等级的数据分别进行独立选窗和编码。通过与或树分析法推导了IWLT码的渐近译码性能,并结合多目标进化算法联合优化编码度分布和选窗概率,以精确匹配预设的不等保护增益及译码开销,增加了不等差错保护方案的灵活性。仿真证明,IWLT码与现有的无码率码不等差错保护方案相比,能在精确匹配不等差错性能参数的前提下,获得更低的译码差错概率。
Abstract:
To match the multimedia service transmission, an unequal error protection (UEP) scheme based on the independent window LT (IW-LT) code is proposed. According to the level of importance, the original data are divided into independent windows and encoded by rateless LT codes. The asymptotic decoding performance of IW-LT codes is derived by the AND-OR tree analysis technique. Moreover, to accurately match the expected UEP gain and decoding overhead, multi-objective genetic algorithms are introduced to optimize the degree distribution and probabilities of selecting windows, which enhance the flexibility of the IW-LT UEP scheme. The simulation results show that, compared with the existing rateless coding UEP scheme, IW-LT codes can obtain a lower decoding error rate under the fixed parameters of UEP property.
陈英,顾术实,焦健,李云鹤,吴绍华,张钦宇. 基于无码率码的独立窗不等差错保护方案[J]. 系统工程与电子技术, doi: 10.3969/j.issn.1001-506X.2014.05.29.
CHEN Ying, GU Shu-shi, JIAO Jian, LI Yun-he, WU Shao-hua, ZHANG Qin-yu. Independent window UEP scheme based on rateless codes[J]. Systems Engineering and Electronics, doi: 10.3969/j.issn.1001-506X.2014.05.29.
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链接本文: https://www.sys-ele.com/CN/10.3969/j.issn.1001-506X.2014.05.29
https://www.sys-ele.com/CN/Y2014/V36/I5/991