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时间:2020-04-14
《基于网络编码的组播率与编码节点数的平衡-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofComputerApplicationsISSNl0ol一90812015.04.10计算机应用,2015,35(4):929—933C0DENJYIIDUhttp://www.joca.ca文章编号:1001-9081(2015)04-0929—05doi:10.11772/j.issn.1001—9081.2015.04.0929基于网络编码的组播率与编码节点数的平衡蒲保兴,赵乘麟(邵阳学院激光技术与信息研究所,湖南邵阳422001)(}通信作者电子邮箱pubook@aliyun.coln.)摘要:为探究单源组播网络编码的组播率与最少编码节点数之间的关系,利用线性网络编
2、码的导出与扩展技术,对两者间的关系进行了理论分析和推导,得出了“最少编码节点数随组播率单调递增”的结论。构造了一个多目标优化模型用于精确地描述两者间的数量关系。为求解这个多目标优化模型,设计出能搜索所有可行编码方案的策略。运用该策略,并结合NSGA-II,提出了求解该模型的算法。在需要兼顾两者平衡的情况下,模型的解为确定编码方案提供了选择依据。所提算法不仅能搜索出整个Pareto集,而且能在指定可行组播率区域的前提下,以较小的运算代价得出相应的部分Pareto集。仿真结果验证了理论分析的结论,表明了所提算法的可行性和有效性。关键词:单源组播;随机线性网络编码;组播率;最少编码节点数;多目标优
3、化中图分类号:TP393.0l文献标志码:ATradeoffbetweenmulticastrateandnumberofcodingnodesbasedonnetworkcodingPUBaoxingZHAOChenglin(InstituteofLaserTechnologyandInformation,ShaoyangUnivemit~ShaoyangHunan422001,China)Abstract:Basedonsingle-sourcemuhicastnetworkcoding,inordertoexploretherelationshipbetweenmuhieastrate
4、andthenumberofminimalneededcodingnodes,byemployingthetechniqueofgenerationandextensionoflinearnetworkcoding,theoreticalanalysisandformuladerivationoftherelationshipweregiven.Itisconcludedthatthenumberoftheminimalneededcodingnodesmonotonouslyincreaseswiththeincreasingofmuhicastrate.Amulti-objectiveo
5、ptimizationmodelwasconstructed,whichaccuratelydescribedthequantitativerelationshipbetweenthem.Forthesakeofsolvingthismodel,asearchstrategywasderivedtosearchallfeasiblecodingschemes.BycombiningthesearchstrategywithNSGA—II,allalgorithmforsolvingthismodelwaspresented.Inthecaseofbeingrequiredtoconsider
6、thetradeofbetweenthem,thesolutionofthemodelisthebasisofchoicefordeterminingnetworkcodingscheme.TheproposedalgorithmnotonlyCaBsearchwholeParetoset,butalsosearchpartParetosetrelatedwithcertainfeasiblemulticastrateregiongivenbyuserwithlesssearchcost.Thesimulationresultsverifytheconclusionoftheoretical
7、analysis,andindicatethattheproposedalgorithmisfeasibleande侬cient.Keywords:single-sourcemulticast;randomlinearnetworkcoding;multicastrate;minimumcodingnodenumber;multi—objectiveoptimization明:实现指定组播率的数据传输并使编码
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