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1、毕业设计外文文献译文及原文学生：焦艳学号：20110311102院（系）：职业教育师范学院专业：电子信息工程指导教师：李颀2013年6月日ZigBee:WirelessTechnologyforLow-PowerSensorNetworksTechnologistshaveneverhadtroublecomingupwithpotentialapplicationsforwirelesssensors.Inahomesecuritysystem,forexample,wirelesssensorsw
2、ouldbemucheasiertoinstallthansensorsthatneedwiring.Thesameistrueinindustrialenvironments,wherewiringtypicallyaccountsfor80%ofthecostofsensorinstallations.Andthenthereareapplicationsforsensorswherewiringisn'tpracticalorevenpossible.Theproblem,though,isth
3、atmostwirelesssensorsusetoomuchpower,whichmeansthattheirbatterieseitherhavetobeverylargeorgetchangedfartoooften.Addtothatsomeskepticismaboutthereliabilityofsensordatathat'ssentthroughtheair,andwirelesssensorssimplyhaven'tlookedveryappealing.Alow-powerwi
4、relesstechnologycalledZigBeeisrewritingthewirelesssensorequation,however.AsecurenetworktechnologythatridesontopoftherecentlyratifiedIEEE802.15.4radiostandard(Figure1),ZigBeepromisestoputwirelesssensorsineverythingfromfactoryautomationsystemstohomesecuri
5、tysystemstoconsumerelectronics.Inconjunctionwith802.15.4,ZigBeeoffersbatterylifeofuptoseveralyearsforcommonsmallbatteries.ZigBeedevicesarealsoexpectedtobecheap,eventuallysellingforlessthan$3pernodebysomeestimates.Withpricesthatlow,theyshouldbeanaturalfi
6、teveninhouseholdproductslikewirelesslightswitches,wirelessthermostats,andsmokedetectors.Figure1:ZigBeeaddsnetwork,security,andapplication-serviceslayerstothePHYandMAClayersoftheIEEE811.15.4radioAlthoughnoformalspecificationforZigBeeyetexists(approvalbyt
7、heZigBeeAlliance,atradegroup,shouldcomelatethisyear),theoutlookforZigBeeappearsbright.TechnologyresearchfirmIn-Stat/MDR,inwhatitcallsa"cautiousaggressive"forecast,predictsthatsalesof802.15.4nodesandchipsetswillincreasefromessentiallyzerotodayto165millio
8、nunitsby2010.NotalloftheseunitswillbecoupledwithZigBee,butmostprobablywillbe.ResearchfirmONWorldpredictsshipmentsof465millionwirelesssensorRFmodulesby2010,with77%ofthembeingZigBee-related.Inasense,ZigBee'sbrightfutureislargelydue
