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1、ABSTRACTABSTRACTWirelesssensornetworks(WSN),whichislarge-scale、self-organization、multi-hop、nonetworkinfrastructuresurposing,iscomposedbynodeswithsensing、processing、storageandcommunicationcapacity.WSNiswidelyusedinmilitary、industrialcontrol、medicalcare、intelligentagriculture、envi
2、ronmentalmonitoringandotherfields.InWSNapplications,nodesarerandomdeployedintestingarea,usuallypoweredbybattery,powerisextremelylimited,requiringthenodehashighenergyefficiencyandusinglow-powerdesigntechniques.thenode’low-powerdesignneedconsiderbothofhardwareandsoftware:inhardwar
3、edesign,chipchoicesneedtobeconsidered,suchasoperatingvoltage、clockfrequency、operatingmode,aswellastheoptimizationofcircuitdesign,tominimizetheenergyofnon-workingmodulesconsumption;Softwaredesignneedstoconsiderthevariousnetworkprotocols,suchasnetworkarchitecture、topology、MACproto
4、cols、routingprotocols、transportprotocolsandsoon.MAC(MediumAccessControl)protocolusedtocontrolthenodessharethelimitedwirelessresourcesfairlyandeffectively,hasagreatinfluencetotheperformanceofthenode.Meanwhile,MACprotocolcancontroltheRFtransceiverinadifferentoperatingmodeswitchtor
5、educetheenergyconsumptioncausedbyidlelistening,hasgreatsignificancefortheentirenodestoachievelowpowerconsumption.AvarietyofenergysavingMACprotocolshavebeenproposedathomeandabroadnow,inwhichtheS-MACprotocolisespeciallydesignedforwirelesssensornetworkapplications.Oneofthemaintasko
6、fthispaperistodesignalow-powersensorhardwareplatform;theotheristheanalysisandimprovementofthepreviousS-MACprotocolandultimatelytoachievetheimprovedS-MAConWSNnodes.Firstly,thispaperhascompletedthedesignofthesensornode(CC1010),includingtheprocessormodule、communicationmodule、sensor
7、module、powermodule、theexternalmoduledesign,andsensor-drivendesignalso.andthen,thispaperanalyzestheprincipleofS-MACprotocol,includingcarriersensemechanism、datatransfermodel.Thepaperhavecompletedimprovementforthesynchronizationmechanism、adaptiveII万方数据ABSTRACTlisteningmechanism、bac
8、koffalgorithmandetc.Inordertofurtherimproveener
