简介：Heterogeneouscellularnetworksimprovethespectrumefficiencyandcoverageofwirelesscommunicationnetworksbydeployinglowpowerbasestation(BS)overlappingtheconventionalmacrocell.ButduetothedisparitybetweenthetransmitpowersofthemacroBSandthelowpowerBS,cellassociationstrategydevelopedfortheconventionalhomogeneousnetworksmayleadtoahighlyunbalancedtrafficloadingwithmostofthetrafficconcentratedonthemacroBS.Inthispaper,weproposeaload-balancecellassociationschemeforheterogeneouscellularnetworkaimingtomaximizethenetworkcapacity.Byrelaxingtheassociationconstraints,wecangettheupperboundofoptimalsolutionandconverttheprimalproblemintoaconvexoptimizationproblem.FurthermoreweproposeaLagrangemultipliersbaseddistributedalgorithmbyusingLagrangedualtheorytosolvetheconvexoptimization,whichconvergestoanoptimalsolutionwithatheoreticalperformanceguarantee.Withtheproposedalgorithm,mobileterminals(MTs)needtojointlyconsidertheirtraffictype,receivedsignal-to-interference-noise-ratios(SINRs)fromBSs,andtheloadofBSswhentheychooseserverBS.SimulationresultsshowthattheloadbalancebetweenmacroandpicoBSisachievedandnetworkcapacityisimprovedsignificantlybyourproposedcellassociationalgorithm.

简介：Thesum-ratecapacityofCDMAandTDMAinvectorbroadcastchannelisresearched.Anupperboundofsum-ratecapacityinCDMAsystemandalowerboundofsum-ratecapacityinTDMAsystemarederivedrespectively.Accordingtothesetwobounds,theratioofthetwoboundsatmostcanachievemin(M,K).HereMistheantennanumberofthetransmitterandKisthenumberoftheuserinthisvectorbroadcastchannel.

简介：Inthispaper,thefeedbackloadreductionprobleminwirelesssystemsbasedonorthogonalfrequencydivisionmultiplexing(OFDM)isinvestigatedandanopportunisticfeedbackscheme(OFS)isproposed.ThekeyideabehindOFSisthatonlythekeychannelgainswhichcansignificantlyaffectthesystemthroughputarefedbacktotheBS.Firstly,thekeychannelgainsareprovedtobelongtoachannelgaininterval.Secondly,astatisticalmethodisproposedtoestimatethechannelgaininterval.Thirdly,theopportunisticfeedbackschemeisformulatedandthefeedbackloadofOFSisanalyzed.TheadvantageofOFSisthreefold:thefirstisOFScanworkinbothOFDM-basedmulticastsystemandOFDM-basedunicastsystem.ThesecondisthechannelfadingtypeoftheBS-userlinkisnotrequired,whichismorerealistic.ThethirdisOFScangetbetterfeedbackloadperformancecomparedwithotherschemes,whileachievingalmostthesamethroughputperformancecomparedwiththatoffullfeedbackscheme.

简介：InvehicleAd-hocnetwok(VANET),trafficloadisoftenunevenlydistributedamongaccesspoints(APs).Suchloadimbalancehampersthenetworkfromfullyutilizingthenetworkcapacity.Toalleviatesuchimbalance,thepaperintroducesanovelpricinggamemodel.Theresearchsceneisattheintersectionwhenthetrafficlightisgreen.Asvehiclesarehighlymobileandthenetworktypologychangesdynamically,thepaperdividesthegreenlighttimeintoequalslotsandcalculatesAPs'priceswiththepresentedpricinggameineachtimeslot.Thewholeprocessisarepeatedgamemodel.ThefinalequilibriumsolutionsetisAPs'pricingstrategy,andthepaperclaimthatthisequilibriumsolutionsetcanaffectvehicles'selectionandensureAPs'load-balancing.Simulationresultsbasedonarealisticvehiculartrafficmodeldemonstratetheeffectivenessofthegamemethod.

简介：在覆盖无线特定的网络的分析，内在的节点分布通常被假定是二独立同类的泊松点进程。在这份报纸，由使用随机的几何学工具，一个新不同类的覆盖无线特定的网络模型被学习，停止概率被分析。由假定那主要(PR)网络节点作为一个泊松点过程(PPP)被散布并且第二等(SR)网络节点作为Matern簇被散布过程，一上面并且一为主要网络和第二等的网络的传播能力的更低的界限被介绍。模拟结果证明PR和SR网络的传播能力将两个都由于SR网络的不同类有小增长。

简介：以便而且改进网络性能，为2D花托的一个路由算法为虚拟隧道从负担平衡的立场被调查。2D花托网络被划分成二个虚拟网络，每条物理隧道被分成三条虚拟隧道。一条新奇虚拟隧道分配政策和一个路由算法被建议，在哪个交通负担被介绍一个随机的参数以一种更平衡负担的方式散布到那些三条虚拟隧道。建议算法的模拟与一张基于SystemC的测试凳子被开发。结果显示出那与相比否定第一为花托网络(NF-T)算法，建议算法能在不同交通模式下面以网络潜伏和产量完成更好的性能。它也证明有为虚拟隧道的负担平衡的一个路由算法能显著地而且改进网络性能。

简介：大多数存在移交决定系统(HDS)图案是整体的，导致高计算的费用并且全面网络失衡。有为第5产生(5G)的一个全面负担索引的一个新奇模块化的移交算法异构的网络(HetNets)被建议。在这份报纸，移交参数，用作移交的基础，被分类进服务(QoS)的网络质量模块，用户偏爱(起来)满足(DS)的模块和度模块根据新模块化的HDS设计。优化切换的过程，全面网络负担索引被使用三角模块熔化操作员推出。关于存在移交算法，模拟结果显示建议算法能减少移交频率并且在高水平维持用户满足。由于它的块计算，同时，它能引起1.4s实行时间改进。

简介：在我们调查了的这份报纸，downlink的表演概括了分布式的天线系统(GDAS)。在空间相关褪色的条件的假设下面，我们根据Bessel功能的系列导出相关系数的数字表达式，并且提起了事件的吝啬的角度的范围限制。而且，当我们从空空间使用了基础向量而不是直角的集合获得一样的系统性能时，分布式的概括分层的空间时间代码(GLST)的体系结构被认为以便完成multiplexing获得和差异获得但是与更低的复杂性。而且，以便最大化能力，Gerschgorin圆基于快天线选择算法包括那些模拟结果的讨论被评估了。

简介：蚂蚁殖民地优化(ACO)基于平衡路由的负担，波长赋值(RWA)算法(ALRWA)为完成在全部光卫星网络上平衡的仙女般的负担的缘故被提出。一个多客观的优化模型就全球交通分发的特征而言被建立。这不仅采用交通紧张修改轻路径费用，而且监视光内部卫星的连接(ISL)的波长利用。然后，一个ACO算法被利用解决这个模型，导致发现为每个连接请求的一条最佳的轻路径。最佳的轻路径让最小的轻路径花费了在下面令人满意波长利用，传播延期和波长连续性的限制。模拟结果证明ALRWA在堵住概率表现很好并且认识到有效负担平衡。同时，平均传播延期能满足即时企业传播的基本要求。

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

简介：Inthisarticle,resultsobtainedfromwidebandmultiple-inputmultiple-outputchannelmeasurementsat4.9GHzarepresented.Measurementswereperformedinanindoorhotspotscenariowithbothline-of-sightandnon-line-of-sightpropagationconditions.Verticalpolarizeduniformlineararrays(ULAs)withdifferentantennaspacingandorientationwereutilizedforinvestigatingtheimpactofantennaconfigurationsonthesystemperformance.Basedonmeasuredchannelimpulseresponses,thespatialcorrelationofULAisanalyzedandcomparedwiththetheoreticalvaluescalculatedfromthepowerazimuthspectrum.Followingthat,theeigenvaluestatisticsandcapacitywithrespecttoantennaspacingandorientationaregivenandcompared.Thediversity-multiplexingtradeoff(DMT)ofmeasuredchannelsatoperationalsignal-to-noiseratio(SNR)isalsopresented.ThereasonwhytheDMTofmeasuredchannelsismuchlowerthanthatofi.i.d.Rayleighchannelsisspecified.

简介：Femtocell是一种有希望的技术与低力量、费用有益的小基础车站改进网络性能。然而，在femtocell网络的干扰有限现实使干扰和资源管理成为钥匙到完成femtocell网络的好处。在这份报纸，下列贡献一步一步地被做：首先，根据在技术和第三产生合伙的网络建筑学投射的认知无线电(CR)(3GPP)的干扰温度模型(ITM)，长期的进化进展了(LTE--一)，优化再使用femtocell的子通道的能力的问题模型在划分策略的频率下面被建立，联合考虑平均干扰限制和即时干扰限制。第二，利用凸的理论，再使用femtocell的子通道的最佳的力量分配被导出。第三在使隧道褪色的瑞利下面，子通道的靠近形式的表情可重用的概率和能力被导出。最后，数字结果被进行到证实我们的分析结果，它能为femtocell网络推广的频率资源分配提供理论指导。

简介：Inthispaper,thecapabilityofIEEE802.11bDistributedCoordinationFunction(DCF)modesupportingofConstantBitRate(CBR)andVariableBitRate(VBR)VoiceoverIP(VoIP)trafficisinvestigated.Then,thecapacityof802.11bWirelessLocalAreaNetwork(WLAN)systemcarryingvoicecallsinawiderangeofscenarios,includingvaryingdelayandpacketlossrateconstraintsisanalyzedandevaluated.BothG.711andG.729voiceencodingschemesandarangeofvoiceinter-arrivaltimeareconsidered.Theanalysesandsimulationresultsshowthatcapacityishighlysensitivetothedelaybudgetallocatedtothesumofpacketizationandwirelessnetworkdelays.Foragivenpacketlossrateconstrained,G.729isshowntohaveacapacitygreaterthanthatwhenG.711isused.ThesimulationresultsshowthatbysupportingVBRunderDCFmodethenetworkhastheapproximatelytwicemuchcapacityassupportingCBRhas,regardlessoftheencodingschemesandtheinter-arrivaltime.