简介:Arraygainwouldbewellexploitedtoimprovepowercoverageifsomepowerfulmultipathcomponentsfromdifferentradiolinkscancoherentlycombineatthereceiver(Rx).Thus,inthispaper,analgorithmisproposedfortransmissioninsimulcastsystem,wherepartialchannelstateinformation(CSI)isneeded.Basedonmeasuredmultipathchannel,performanceoftheproposedalgorithmisevaluated.Accordingtosimulationresults,theproposedalgorithmoutperformsthedirectionsummation(DS)schemeandmultipathantennadiversity(MAD)algorithm,with2~4dBadvantageoverthelatters.Especiallyinlineofsight(LOS)scenario,theadvantageismoreobvious.Besides,theproposedalgorithmbringsmoregainwithincreasingnumberoftransmitantennaswithoutadditionalpower.Finally,robustnessoftheproposedalgorithmisexaminedwithimperfectCSI.
简介:Becauseofrapiddevelopmentinnetworktechnology,Internetusagehasbecomewidespread.Itallowsuserswithsensingdevicestoobtainmedicaldataforhealthcare,suchasphysiologicalsignals,voice,andvideostreamsfromtelemedicinesystems,andtosendthehealthcaredatatoback-enddatabasesystems,creatingaubiquitoushealthcareenvironment.However,thisenvironmentrequiresawidespreadandsuitablenetwork.IPv6(Internetprotocolversion6)isthenext-generationInternetprotocolthatwillbetheprotocoloffuturenetworks;itimprovesmanyshortcomingsofIPv4.Inthispaper,weproposeanIPv6/IPv4U-home-caretestsystemandanalyzethenetwork’sparametersthoughaseriesoftestsbyadjustingnetworkparameterstofindtheoptimaldesignforapplicationsintheIPv6/IPv4U-home-careservicesoastoassuregoodperformanceandhighquality.