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1、JournalofComputerandSystemSciences79(2013)1005–1016ContentslistsavailableatSciVerseScienceDirectJournalofComputerandSystemScienceswww.elsevier.com/locate/jcssAneffectivesignalstrength-basedwirelesslocationestimationsystemfortrackingindoormobileusersJosephKee-YinNga,?,

2、Kam-YiuLamb,QuanJiaChenga,KevinChinYiuShumaaDepartmentofComputerScience,HongKongBaptistUniversity,HongKongbDepartmentofComputerScience,CityUniversityofHongKong,HongKongarticleinfoabstractArticlehistory:Localizationisanessentialfunctionforlocation-dependentservices.Alt

3、houghvariousReceived25June2012e?cientlocalizationmethodshavebeenproposed,manyofthemhavenottestedwithReceivedinrevisedform13December2012practicalapplications.Differentlocation-dependentapplicationsmayhaveverydifferentAccepted25January2013performanceandoperationrequirem

4、entssuchastheaccuracyinlocalizationandfrequencyAvailableonline31January2013oflocationtracking.Inthispaper,basedonourpreviousworksonthedesignofe?cientlocalizationmethods,westudytheimportantissuesinthedesignandimplementationKeywords:Localizationofalocationtrackingsystem

5、formonitoringpeopleinanindoorenvironmentwithinLocationestimationsystemalargebuildingsuchasinrehabitcentresandschools.InestimatingthecurrentlocationofLocationtrackingamobileuser,weadoptthereceivedsignalstrengthindicator(RSSI)approach.EnhancementsUbiquitous/pervasivecom

6、putingareproposedtoimprovetheaccuracyinlocalizationusingRSSI.Toensurethereliabilityofthelocationresultsandthee?ciencyinlocationtracking,itisimportanttominimizethetra?coflocationdataonthenetwork,aswellasthechanceofoverloadingtheestimationsystem.Variousissuesinthedesign

7、ofthesystemarediscussedandtheperformanceresultsofthesystemareprovidedtoillustratethee?ciencyandthelimitationsoftheproposedmethods.?2013ElsevierInc.Allrightsreserved.1.IntroductionWithrapidadvancementsinmobilecomputingandcommunicationtechnologies,thedesignanddevelopmen

8、tofhigh-performancemobileandlocation-dependentapplicationshavebeenahotresearchtopicinrecentyears.Anessentialfunctionrequired