简介:Withtheobjectiveoftakingfulluseofchannelresource,weproposedtwoutilitybaseddynamicsubcarrierallocation(DSA)algorithmsforthesinglecarrierfrequencydivisionmultipleaccess(SC-FDMA)system,whicharetheproportionalfairfrugalityconstrained(PF-FC)algorithmandtheweightedproportionalfairfrugalityconstrained(WPF-FC)algorithm.Thetwoproposedalgorithmsaredesignedunderthefrugalityconstraint(FC)controlconsiderationsoastoavoidserviceratewasteandimprovethespectrumefficiency.Moreover,thequeuingbuffermodelinthispaperisestablishedonafinitesizestructureratherthanthetraditionalinfinitequeuingmanner,whichismoreconsistentwiththepracticaltransmissioncondition.Simulationresultsindicatethatthetwoproposedalgorithmscanbothachievesignificantlybettersystemrate-sumcapacityandqualityofservice(QoS)performancethantheirprimaryalgorithms,andaremoreapplicablefortheheterogeneoustraffic.
简介:Inlongtermevolution(LTE)uplinksinglecarrierfrequencydivisionmultipleaccess(SC-FDMA)system,therestrictionthatmultipleresourceblocks(RBs)allocatedtoausershouldbeadjacent,makestheresourceallocationproblemhardtosolve.Moreover,withthepracticalconstraintthatperfectchannelstateinformation(CSI)cannotbeobtainedintime-varyingchannel,theresourceallocationproblemwillbecomemoredifficult.Inthispaper,anefficientresourceallocationalgorithmisproposedinLTEuplinkSC-FDMAsystemwithimperfectCSIassumption.Firstly,theresourceallocationproblemisformulatedasamixedintegerprogrammingproblem.Thenanefficientalgorithmbasedondiscretestochasticoptimizationisproposedtosolvetheproblem.Finally,simulationresultsshowthattheproposedalgorithmhasdesirablesystemperformance.
简介:摘要:基于L波段250W的GAN功放管,本文成功实现一款800W的固态脉冲功率放大模块;实验结果表明,该脉冲功率放大器可应用于L频段高占空比脉冲功率发射机中。