无线传感器网络生命周期的跨层优化研究

《无线传感器网络生命周期的跨层优化研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、上海交通大学硕士学位论文无线传感器网络生命周期的跨层优化研究姓名：高强申请学位级别：硕士专业：通信与信息系统指导教师：杨宇航20081201摘要星座体积进行传输数据时，网络生命周期将接近物理层星座体积变化时所获得的最大网络生命周期。以此结论为基础，本文将仿真模型拓展为非TDMA网络，并提出一种迭代算法，解决了非TDMA网络的非凸优化问题。最后通过对此算法性能的评价得出：相对于TDMA网络，本文所提算法将会进一步提高网络的生命周期；同时，由于在物理层使用相同的星座体积，算法的复杂度将会下降。对于时延

2、敏感的网络，本文作者还建立了“生命周期—时延”关系模型，分析了本文提出的算法对传感器网络时延的影响。关键词：无线传感器网络，生命周期，跨层优化，最优化，TDMA，时延第II页ABSTRACTLIFETIMEOPTIMIZATIONINWIRELESSSENSORNETWORKABSTRACTWirelesssensornetworkisthecombinationofinformationcollection,transmissionandprocessing.Wirelesssensornetw

3、orkcombinedthesensortechnology,embeddedtechnology,wirelesscommunication,anddistributedinformationprocessingandmicro-electro-mechanismsystem.Itcanmonitorenvironmentandcollectinformationinrealtimewithallkindsofintegratedmicro-sensor.Themicro-sensorwould

4、processthecollectedinformationbyembeddedunitandfinallytransporttheinformationtoterminaluserbymulti-hopwirelessadhocnetworkwhichconstructedrandomly.However,newincomingproblemsarefollowedwiththebirthofthewirelesssensornetwork.Asknownthatsensornetworkrel

5、iesonthebatterytosupplyenergy,itisimpossibletorechargeandreplacethebatteryinsensor.Therefore,theproblemhowtomaximizelifetimeofwirelesssensornetworkattractsresearchers'attention.Theyhaveproposedmultipleoptimizationmodelsandcross-layerstrategiestodealwi

6、ththisproblem.Inthisarticle,weanalyzecurrentlayer-basedoptimalmethodsinwirelesssensornetworkandsummarizethephysical,linkandroutingoptimizationtechniques.Thenwecomparesomestrategiesincross-layeroptimizationalgorithms.Accordingtotheanalysisandsummaryoft

7、hecurrentlifetimeoptimizationalgorithmsinwirelesssensornetwork,wefirstlyfocusonsynchronoussmall-scalenetworkswithinterference-freelinkschedulingandpracticalMQAMlinktransmissionschemes.Inthiscase,ourmodelisTDMAmodel,andoptimizationproblemcanbecloselyap

8、proximatedasaconvexoptimization第III页ABSTRACTproblemthatcanbeefficientlysolved.Weexplorethemodulationrateinphysicallayerhowtoaffectthenetworklifetime.Theresultdemonstratesthatnetworklifetimewillbeprolongedwiththeadaptivemodulationrate.Therealso