简介：Inthispaper,anovelmultipletrelliscodedorthogonaltransmitschemeisproposedtoexploittransmitdiversityinfadingchannels.Inthisscheme,auniquevectorfromasetoforthogonalvectorsisassignedtoeachtransmitantenna.Eachoftheoutputsymbolsfromthemultipletrellisencoderismultipliedwithoneoftheseorthogonalvectorsandtransmittedfromcorrespondingtransmitantennas.Bycorrelatingwithcorrespondingorthogonalvectors,thereceiverseparatessymbolstransmittedfromdifferenttransmitantennas.Thisschemecanbeadoptedincoherent/differentialsystemswithanynumberoftransmitantennas.Itisshownthattheproposedschemeencompassestheconventionaltrelliscodedunitaryspace-timemodulationbasedontheoptimalcyclicgroupcodesasaspecialcase.Wealsoproposetwobetterdesignsovertheconventionaltrelliscodedunitaryspace-timemodulation.Thefirstdesignuses8PhaseShiftKeying(8-PSK)constellationsinsteadof16PhaseShiftKeying(16-PSK)constellationsintheconventionaltrelliscodedunitaryspace-timemodulation.Asaresult,theproductdistanceofthisnewdesignismuchlargerthanthatoftheconventionaltrelliscodedunitaryspace-timemodulation.Theseconddesignintroducesconstellationswithmultiplelevelsofamplitudesintothedesignofthemultipletrelliscodedorthogonaltransmitscheme.Forbothdesigns,simulationsshowthatmultipletrelliscodedorthogonaltransmitschemescanachievebetterperformancethantheconventionaltrelliscodedunitaryspace-timeschemes.

简介：一台哑的收音机和与普通接收装置同时交流的多重认知收音机被考虑的一种情形。在这份报纸，我们在两添加剂白人Gaussian噪音(AWGN)下面导出多重用户的认知多重存取的隧道(MUCMAC)的一个可完成的率区域隧道和rayleigh褪色隧道，由使用多重用户的联合弄脏编码的纸(DPC)和编码的重叠。通过认知，这被假定第二等的用户(怀疑)能获得主要用户(PU)的消息非有原因地预先准备。用这个方面信息，SUs能执行多重用户DPC从苏避免干扰。而且，SUs能也分配他们的transmit力量的部分帮助PU，用编码的重叠。因此，传统的多重存取的隧道(MAC)的能力区域能被扩大。而且，一些asymptotic结果作为数字被显示出怀疑增加。在AWGN盒子中，PU的最大的可完成的率随数字的增加对数地成长，这被说明，在瑞利盒子中怀疑，我们证明认知获得将与隧道信号减少到噪音比率(SNR)增加。

简介：Whenthereturnscomefromtwoormoreunresolvedtargets(thesignalsarenotresolvedinthefrequencyortimedomains)inamonopulseradarsystem,thedirection-of-arrival(DOA)estimateindicatedbythemonopulseratioisnotthetrueinformationofthetrackedtarget.Thenthetrackingsystemsisinfluenced.Anapproachhasbeenproposedtodetectwhetherthereturnscomefromasingletargetortwounresolvedtargets.Theaboveapproachisextendedfromtwotothreeunresolvedtargets.Thesimulationindicatesthatthedetectionprobabilityunderthethreeunresolvedtargetsisnotsuretoexceedthedetectionprobabilityunderthetwounresolvedtargets.

简介：Blindidentification-blindequalizationforFiniteImpulseResponse(FIR)MultipleInput-MultipleOutput(MIMO)channelscanbereformulatedastheproblemofblindsourcesseparation.Ithasbeenshownthatblindidentificationviadecorrelatingsub-channelsmethodcouldrecovertheinputsources.TheBlindIdentificationviaDecorrelatingSub-channels(BIDS)algorithmfirstconstructsasetofdecorrelators,whichdecorrelatetheoutputsignalsofsubchannels,andthenestimatesthechannelmatrixusingthetransferfunctionsofthedecorrelatorsandfinallyrecoverstheinputsignalusingtheestimatedchannelmatrix.Inthispaper,anewapproximationoftheinputsourceforFIR-MIMOchannelsbasedonthemaximumlikelihoodsourceseparationmethodisproposed.TheproposedmethodoutperformsBIDSinthepresenceofadditivewhiteGaussiannoise.

简介：Muellermatrixelementsarepresentedrepresentingscatterto90°fromanincidentpolarizedlaserbeam.Thecasedsconsideredincludefiveparticlesizes(suchas1.24μm，0.494μm,0.36μm,0.123μm,and0.065μm),twconcentrations(suchas0.0025%and0.005%byvolume),andthreedetectordepths(suchas0,1.5cm,and3cmintothescateringvolume).Ifthemagnitudesoftheelementscanberoundedofftothenearest0.01,aparticlesizedependenceisdescribedbytheresultingaveragematrices,whichisonlytwomatricesford>0.22μmandd<0.22μmwhicharenonsingularandasymmetric,respectively.

简介：ＭｕｌｔｉｐｌｅＣｒｉｔｅｒｉａＧａｍｅｓ－ＴｈｅｏｒｙａｎｄＡｐｐｌｉｃａｔｉｏｎｓ￥ＡｎｄｒｚｅｊＰ．Ｗｉｅｒｚｂｉｃｋｉ（ＩｎｓｔｉｔｕｔｅｏｆＣｏｎｔｒｏｌａｎｄＣｏｍｐｕｔａｔｉｏｎＥｎｇｉｎｅｅｒｉｎｇ，ＷａｒｓａｗＵｎｉｖｅｒｓｉｔｙｏ...

简介：Theoptimizationproblemisconsideredinwhichtheobjectivefunctionispseudolinear(bothpseudoconvexandpseudoconcave)andtheconstraintsarelinear.Thegeneralexpressionfortheoptimalsolutionstotheproblemisderivedwiththerepresentationtheoremofpolyhedralsets,andtheuniquenessconditionoftheoptimalsolutionandthecomputationalprocedurestodeterminealloptimalsolutions(iftheuniquenessconditionisnotsatisfied)areprovided.Finally,anillustrativeexampleisalsogiven.

简介：Inordertobetterassesstheperformanceofwirelesscommunicationsystems,itisdesirabletoproducemultipleRayleighfadingenvelopeswithspecifiedcorrelations.Inthispaper,weanalyzetheoreticallyaprocedurewhichgeneratescorrelatedGaussianrandomvariablesfromindependentGaussianrandomvariablesandgiveaphysicalexplanationforthelimitationofthisprocedure.Then,basedonsomeuncorrelatedRayleighfadingenvelopes,asimplebutefficientprocedureforgeneratinganarbitrarynumberofcross-correlatedRayleighfadingenvelopesisproposed.Simulationresultsandcomputationalcomplexityanalysisarepresented,whichshowthattheproposedmethodhassomeadvantages,suchashighaccuracy,lowcomputationalcomplexityandeasyimplementation,overtheconventionalsimulationmethod.

简介：Aswitchingvariabilityindex(SVI)constantfalsealarmrate(CFAR)detectorisproposedforimprovingthedetectionperformanceofVI-CFARdetectorsinmultipletargetsbackgrounds.Whenthepresenceofnon-homogeneityinCFARreferencewindowsisindicatedbyaVI-CFARdetector,aswitchingCFARdetectorisintroducedtooptimizetheperformanceoftheVI-CFARdetectorinhomogeneous,multipletargetsandclutteredgebackgrounds.ThestructureandparametersselectionmethodoftheSVI-CFARdetectorispresented.ComparisonswithclassicCFARdetectorsandrecentlyproposeddetectorsarealsogiven.TheoreticalanalysisandsimulationresultsshowthatSVICFARdetectormaintainsthegoodperformanceoftheVI-CFARdetectorinhomogeneousandclutteredgebackgrounds,whilegreatlyimprovingthecapacityofanti-multitargets.

简介：Coverageholesoftenappearinwirelesssensornetworksduetosensorfailureortheinheritanceofsensor'srandomdistribution.Inthehybridmodel,mobilesensorsinthenetworkareacquiredtohealcoverageholesbytheirmobility.Whenmultiplecoverageholesappearinthesensornetworkandeachofthemhasatimerequirement(inwhichthecoverageholehastobehealed),conflictsfortherequestsofthesamemobilesensormayarise.Adistributedmultiplemobilesensorschedulingprotocol(DMS)isproposedinthispapertosolvethisproblembyfindingmobilesensorsinthetimeresponsezonedefinedbythetimerequirementofeachcoveragehole.SimulationresultsshowthatDMScanwellschedulethemobilesensorstomovetomultiplecoverageholeswithinthetimerequirement.

简介：Orthogonalfrequencydivisionmultipleaccess(OFDMA)isapopularandwidelyacceptedmultipleaccesstechniquetoprovidehighdatarateservicesinamobileenvironmentintheareaofwirelesscommunications.OFDMAcanprovidebetterflexibilityinallocatingtheradiospectrabyutilizingsubcarrierallocations,scheduling,andenergycontroltoobtainmulti-dimensiondiversitygains.Duetoitsresourceallocationflexibility,OFDMAhasbeenwidelyusedasagreenairinterfacetechnologyfortheemergingbroadbandwirelessaccessnetworks.ThispaperextensivelyaddressestheintegrationofgreenOFDMAtothefutureairinterfacetechnologies,forinstance:two-tiercellular,multiradioaccesstechnologies(RATs),FemtoCell,andrelaynetworks.ThemainfocusofthepaperistoreviewandanalyzethecurrentOFDMAtechniquestoaddressthegreenresourceallocationinmultiuserdiversity,wherethecriticalconstraintsarethecomputationalcomplexity,energyefficiency,andthesub-channelassignment.ThefuturetrendofOFDMAbasednetworkswillaimtomaximizetheenergyefficiencyoftheexclusivechannelassignmentthroughajointsub-channelandpowerallocationtoaccommodatehighdatatrafficnetworksspeciallytherelaybased5Gcellularnetworks.

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简介：Theproblemofdistributedproportionalfairinter-cellfrequencyallocationforflat-structuredcellularsystemsisstudiedinthispaper.Wefirstlyproposeaframeworkofthefrequencyallocationinwhichthewholefrequencyallocationprocessisdecomposedintomanyconsecutivestages,thenidentifythatforeachstagethekeyistofindtheMaximumWeightIndependentSet(MWIS)inagivenweightedconflictgraphinthedistributedmanner.AnewdistributedalgorithmforMWISisdescribedinwhicheachnodeiterativelyexchangesmessageswithneighbors.WiththisdistributedMWISalgorithm,anewdistributedproportionalfairfrequencyallocationschemeispresented.TheperformanceoftheproposedalgorithmistestedincomputerexperimentssimulatingtheLongTermEvolution(LTE)cellularsystems.Simulationresultsshowtheperformanceoftheproposeddistributedproportionalfairfrequencyallocationschemeiscomparablewiththecentralizedones.

简介：Interactingmultiplemodelsisthehotspotintheresearchofmaneuveringtargetmodelsatpresent.AhierarchicalideaisintroducedintoIMMalgorithm.Themethodisthatthewholemodelsareorganizedastwolevelstoco-work,andeachcellmodelisanimproved'current'statisticalmodel.Intheimprovedmodel,akindofnonlinearfuzzymembershipfunctionispresentedtogetoverthelimitationoforiginalmodel,whichcannottrackweakmaneuveringtargetprecisely.Atlast,simulationexperimentsprovetheefficientofthenovelalgorithmcomparedtointeractingmultiplemodelandhierarchicalinteractingmultiplemodelbasedoriginal'current'statisticalmodelintrackingprecision.

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简介：Thispaperpresentsanoveltrustmodelbasedonmultipledecisionfactortheory(MDFT)andatrustroutingalgorithmbasedonMDFTtoexactlyevaluateroutingnodetrustandestablishatrustworthyroutingpath.MDFTintegratesfourdimensionaltrustdecisionfactorsincludingbehavior,state,recommendandnodelivenesstorealizeanexactlyfiner-grainedtrustevaluation.OnthebasisofMDFT,atrustroutingalgorithmispresentedandvalidatedinopenshortestpathfirst(OSPF)protocol.Simulationresultsshowthatthealgorithmcanreflecttheroutingnodetrustaccuratelyandhasbetterdynamicresponseability.Underthecircumstanceofexistingdeceptivenodes,thealgorithmhasbetteranti-deceptionperformanceandhigherattacknodedetectionratethanconventionalalgorithm.

简介：Therearemanykindsofspecialrelationshipsbetweenmultiple-valuedlogicalfunc-tionsandtheirvariables,andtheyaredifficulttobejudgedfromtheirexpressions.Inthispaper,somesufficientandnecessaryconditionsoftheindependenceandstatisticalindependenceofmultiple-valuedlogicalfunctionsontheirvariablesaregiven.Someconditionsofalgebraicindependenceofmultiple-valuedlogicalfunctionsonsomeoftheirvariablesandthewaytode-generateafunctiontothegreatestextentareproposed,andsomeapplicationsoftheseresultsareindicated.AlltheresultsarestudiedbyusingChrestensonspectraltechniques.

简介：Thebuildingsectoranditsheatingandcoolingrepresentoneofthemajorconsumerofenergyworldwide.Simultaneously,theshareoffluctuatinggenerationofrenewableenergiesintheenergymixincreases.Thereforestorageanddemandsidemanagementtechnologiesarerequired.Thenewadaptiveandpredictivecontrolalgorithmforthermallyactivatedbuildingsystems(TABS)basedonmultiplelinearregression(AMLR)presentedinthispaperenablestheapplicationofdemandsidemanagement(DSM)strategies.Basedonsimulations,differentstrategieshavebeencomparedwitheachother.ByapplyingtheAMLRalgorithm,electricityenergycostsavingsof38%couldbeachievedcomparedtotheconventionalcontrolstrategyforTABS,whileincreasingthethermalcomfort.Atthesametime,thermalenergydemandcanbereducedintherangebetween4%to8%,andpumpoperationtimefrom86%to89%.

简介：Anewmeasurement-basedadmissioncontrolalgorithmtosupportQualityofService(QoS)demandisproposedforsoftreal-timeapplications.Inthealgorithm,admissiontestisperformedacrossMultipleTime-Scales(MTS)toaccuratelycapturetrafficfluctuationonvarioustime-scales.ByapplyingtheQoSrequirementsdirectlytoadmissiontest,theMTSalgorithmcanproperlymeettheQoStargetandmaximizethebandwidthutilization.

简介：这篇文章考虑由与利用一个单个一半双的继电器的相应目的地交流的多重来源组成的一个无线网络，而，来源机会主义地使用继电器。由与有效电容的概念集成信息理论，这篇文章在瞄准最大化继电器网络产量的无线继电器网络上建议动态时间分配策略，题目到服务(QoS)的给定的延期质量限制，在哪儿预定分割多重存取(TDMA)在继电器网络被使用。模拟结果证明建议分配策略罐头显著地作为与传统的相等的时间分配策略相比改进有效能力。