简介:CapacityofMIMOLAS-CDMAsystemsundermulti-pathfadingchannelswithtwodifferentcorrelatingmodelswerestudiedinthepaper.Influencesofthetwomodelsparametersoncapacitywereanalyzed.Thenumericalresultspresentthat:accordingtotheVariousScatteringEnvironmentscorrelatingmodel,whentheinner-elementsdistanceofantennasarrayislargethan0.5λ,correlationalmostdoesnottakefromthesystemcapacity;fortheSalz-Wintercorrelatingmodel,thespreadangleatreceiveristheotherkeyfactor,italsoinfluencethesystemcapacitygreatly.
简介:Three-layerAdaptiveBack-PropagationNeuralNetworks(TABPNN)areemployedforthedemodulationofspreadspectrumsignalsinamultiple-accessenvironment.Aconfigurationemployingthree-layeradaptiveBack-propagationneuralnetworksisputforwardforthedemodulationofspread-spectrumsignalsinasynchronousGaussianchannels.Thetheoreticalargumentsandpracticalperformancebasedontheneuralnetworksareanalyzed.Theresultsshowthatwhethertheresistancetothemultipleaccessinterferenceortherobusttonear-fareffects,theproposeddetectorsignificantlyoutperformsnotonlytheconventionaldetectorbutalsotheBPneuralnetworksdetectorandiscomparabletotheoptimumdetector.