简介：CapacityofMIMOLAS-CDMAsystemsundermulti-pathfadingchannelswithtwodifferentcorrelatingmodelswerestudiedinthepaper.Influencesofthetwomodelsparametersoncapacitywereanalyzed.Thenumericalresultspresentthat:accordingtotheVariousScatteringEnvironmentscorrelatingmodel,whentheinner-elementsdistanceofantennasarrayislargethan0.5λ,correlationalmostdoesnottakefromthesystemcapacity;fortheSalz-Wintercorrelatingmodel,thespreadangleatreceiveristheotherkeyfactor,italsoinfluencethesystemcapacitygreatly.

简介：这篇文章在继电器在使隧道褪色的瑞利上联网的decode-and-forward(DF)在总数力量限制下面为机会主义的接力赛学习停止性能的靠近形式的表达式，假设多重天线在继电器节点是可得到的。根据是否即时signal-to-noise比率(SNR)或平均SNR能最好为继电器选择，二个机会主义的继电器计划，机会主义的多天线继电器选择(OMRS)和一般水准被利用继电器选择(ABRS)被建议。二个计划的表演借助于理论分析和模拟被评估。OMRS在多天线继电器选择计划之中是停止最佳的并且仔细接近作为理论知道的beamforming(BF)计划，这被观察停止最佳。与相比以前的单个天线的机会主义的中继(或)计划，OMRS带给显著性能改进，它从联合的最大的比率(MRC)和beamforming技术被获得。在不对称的隧道的ABRS的表演在低、中部的SNR范围接近OMRS，这也被显示出。

简介：Three-layerAdaptiveBack-PropagationNeuralNetworks(TABPNN)areemployedforthedemodulationofspreadspectrumsignalsinamultiple-accessenvironment.Aconfigurationemployingthree-layeradaptiveBack-propagationneuralnetworksisputforwardforthedemodulationofspread-spectrumsignalsinasynchronousGaussianchannels.Thetheoreticalargumentsandpracticalperformancebasedontheneuralnetworksareanalyzed.Theresultsshowthatwhethertheresistancetothemultipleaccessinterferenceortherobusttonear-fareffects,theproposeddetectorsignificantlyoutperformsnotonlytheconventionaldetectorbutalsotheBPneuralnetworksdetectorandiscomparabletotheoptimumdetector.

简介：Theonlinesocialnetworks(OSNs)offerattractivemeansforsocialinteractionsanddatasharing,aswellasraiseanumberofsecurityandprivacyissues.Althoughcurrentsolutionsproposetoencryptdatabeforesharing,theaccesscontrolofencrypteddatahasbecomeachallengingtask.Moreover,multipleownersmayenforcedifferentaccesspolicytothesamedatabecauseoftheirdifferentprivacyconcerns.Adigitalrightsmanagement(DRM)schemeisproposedforencrypteddatainOSNs.Inordertoprotectusers'sensitivedata,theschemeallowsusersoutsourceencrypteddatatotheOSNsserviceproviderforsharingandcustomizetheaccesspolicyoftheirdatabasedonciphertext-policyattribute-basedencryption.Furthermore,theschemepresentsamultipartyaccesscontrolmodelbasedonidentity-basedbroadcastencryptionandciphertext-policyattribute-basedproxyre-encryption,whichenablesmultipleowners,suchastaggeduserswhoappearinasingledata,customizetheaccesspolicycollaboratively,andalsoallowsthedisseminatorsupdatetheaccesspolicyiftheirattributessatisfytheexistingaccesspolicy.Securityanalysisandcomparisonindicatethattheproposedschemeissecureandefficient.

简介：由于嵌入的设备的限制尽最大努力以精力，处理力量，和记忆缩放的无线连接和资源和有损耗的网络(LLN)的unreliability，网络拥挤可以在一种紧急情况发生并且导致重要的包损失和端对端的延期。减轻网络拥挤的效果，这份报纸基于多度量标准(CCRPM)建议一个集中的拥挤控制路由协议。让候选人父母在网络建设的过程减少网络拥挤的概率联合一个节点，缓冲区占有率，无线连接质量，和亚节点的当前的数字的剩余精力。另外，当网络拥挤发生时，决定拥挤的节点的亚节点是否需要基于交通分析被交换采用一个集中的方法。理论分析和广泛的模拟结果证明与存在路由协议相比，CCRPM的性能在减少网络拥挤的概率显著地被改进，延长平均网络一生，增加网络产量，并且减少端对端的延期。

简介：Thepapermainlystudiesthesum-rateperformanceoflimitedfeedback(LFB)block-diagonalization(BD)inmulti-userdistributedantennasystem(DAS).Asthechannelstateinformation(CSI)fedbacktobasestation(BS)islimited,multi-userinterference(MUI)iscausedinevitablybecauseofthequantizationerror.ConsideringtheinfluenceoftheMUItothecapacityofDAS,weproposeaparameterofeffectivesum-rateratio(ESRR)todenotethecapacityoffsetundertheconditionoftheBScangetperfectCSIandlimitedCSIfirst,thenweconfirmthattheapproximatedESRRisveryclosetoactualESRRgotthroughsimulations.Afterthat,basedontheapproximatedESRR,anadaptiveminimumbitfeedbackschemewhichcaneffectivelyreducetheoverheadoffeedbackchannelandthecomplexityofthesystemisproposed.Simulationresultsshowtheeffectivenessoftheproposedscheme.

简介：在有直接路径的严肃的堵住的城市的环境，non-line-of-sight(NLOS)繁殖影响地点评价精确性。在这篇文章，一个新奇算法被开发，它能显著地在地点评价减轻NLOS错误。多利用天线数组，信息散布ers那个原因NLOS繁殖被获得。然后，我们把信息与TOA/TDOA相结合估计活动车站(MS)的地点的基于的地点算法。模拟结果证明我们的方法能减轻NLOS错误并且极大地提高地点精确性。

简介：Thispaperstudiestheproblemofeffectiveresourceallocationformulti-radioaccesstechnologies(Multi-RAT)nodesinheterogeneouscognitivewirelessnetworks(HCWNs).End-to-endutility,whichisdefinedasthedelayofend-to-endcommunication,istakenintoaccountinthispaper.InthescenarioofHCWNs,itisassumedthatthecognitiveradionodeshavetheabilityofMulti-RATandcancommunicatewitheachotherthroughdifferentpathssimultaneouslybysplittingthearrivalpackets.Inthispaper,theproblemisformulatedastheoptimizationofsplitratioandpowerallocationofthesourcecognitiveradionodetominimizethedelayofend-to-endcommunication,andalowcomplexitystep-by-stepiterativealgorithmisproposed.Numericalresultsshowgoodperformanceoftheproposedalgorithmovertwootherconventionalalgorithms.

简介：异构的网络(het网)是推进的长期的进化的部分(LTE--一)学习条款并且与不同重叠范围区域的房间的混合物代表细胞的推广，例如，很多个继电器和微微房间在一样的频率由一个宏房间覆盖了。平衡的交通和干扰管理为LTE在het网设计被要求--维持系统性能的A。在这份报纸，我们建议集中于减少有效资源费用并且在多域het网减轻合作隧道干扰的一个内部域的合作交通平衡计划。我们首先在het网建立了多域的概念并且把合作隧道干扰合并到平衡计划的建议交通。然后，我们为最小化有效资源费用作为一个多域交通资源优化问题为交通平衡问题建模。为平衡计划的建议交通的详细实现被设计。在数字评估，基因算法(GA)作为一个优化方法被用来证明全部的有效资源费用显著地通过我们平衡计划的建议内部域的交通被减少，与平衡计划的intra域交通作比较。43%资源费用被节省。在系统水平模拟，信号干扰噪音比率(SINR)和产量的性能结果证明建议计划在het网在干扰管理有大优点。

简介：Orthogonalfrequencydivisionmultiplexing(OFDM)whichhasbeenadoptedinthelong-termevolution(LTE)systemcanimprovethesystemcapacityobviously.However,italsobringsaboutsevereinter-cellinterference(ICI)forcell-edgeusers(CEUs).Totacklethisproblem,multi-userselectionandpowercontrol(MuS-PC)isproposedasanefficientschemeinuplinkcoordinatedmulti-pointmulti-usermulti-inputmulti-output(CoMP-MU-MIMO)transmission/reception.Thispaperjointlyconsidersuser’ssignaltointerferenceplusnoiseratio(SINR)andproportionalfairness(PF)tomaximizethetotalchannelcapacityinmulti-userselectionbyformulatingapenaltyfunction.Tosimplifythepenaltyfunction’scomputation,particleswarmoptimization(PSO)algorithmisintroduced.Inaddition,powercontrolisadoptedtomaximizeoverallenergyefficiency.SimulationresultsdemonstratethattheMuS-PCschemecannotonlyobtaintheoptimaltotalchannelcapacitywhileguaranteeeachuser’squalityofservice(QoS)andPF,butalsolargelyreducecomputationalcomplexityandimproveenergyefficiency.Asaresult,thepoorcommunicationqualityofCEUscanbeenhanced.

简介：Inordertoestablisharoutesupportingmulti-constrainedqualityofservice(QoS),increasenetworkthroughputandreducenetworkenergyconsumption,animprovedantcolony-basedmulti-constrainedQoSenergy-savingroutingalgorithm(IAMQER)isproposed.Theantcolonyalgorithm,asoneoftheavailableheuristicalgorithms,isusedtofindtheoptimalroutefromsourcenodetodestinationnode.TheproposedIAMQERalgorithm,whichisbasedontheanalysisoflocalnodeinformationsuchasnodequeuelength,nodeforwardingnumberofdatapacketsandnoderesidualenergy,balancestherelationshipbetweenthenetworkthroughputandtheenergyconsumption,thusimprovingtheperformanceofnetworkinmulti-constrainedQoSrouting.SimulationresultsshowthatthisIAMQERalgorithmcanfindtheQoSroutethatreduceaverageenergyconsumptionandimprovesnetworkpacketdeliveryratioundertheend-to-enddelayandpacketlossratioconstraints.