ofdm系统资源调度与分配策略在铁路通信系统中的应用

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1、ABSTRACTABSTRACT：OFDMhasanexcellentcharactertoresistmultipathfadingandfrequencyselectivefading,whichhasbeenusedinmoreandmolewirelesscommunicationstandards，andthistechnologyhasbecomethefirstchoiceforbroadbandwirelesscommunicationsystem．However,becauseofthech

2、aracteroftime-varyinginwirelesscommunicationsystemandthescarcityofwirelessresources，howtousethelimitedresources(includingsubearriers，adaptivemodulation,power)tomeettheneedsofmulti—userandmulti-serviceQOSdemands，andimprovespectrumutilizationrateandenhancesys

3、temcapacity，hasbecomethecoreofthestudyinbroadbandtransmissiontechnology．111evastmajorityoftheexistingresourceallocationandmanagementstrategiesalebasedonthephysicallayer,whichdon’tconsiderwaitingmembersofthebusinessdataqueue，therandomcharacterofdatapacketsar

4、rival，datapackettransmissiondelay，anumberofdifferentbusinesstypes，etc．Becauseofthesetopfactors，thosestrategiesCannotbedirectlyappliedinwirelesssystemswhicharebasedonpacketstransmission．耽ecross-layerschedulingalgorithmformulti—businessandmulti-serviceOFDMsys

5、temisstillrare．Inthispaper,basedontheMAClayerandphysicallayersimulationplatform，theOFDMsystemdynamicresourcesschedulingandallocmionundertherailwaycommunicationsystemistakenasaresearchdirection．111erailwaycommunicationsystemiseasytobeimpactedbythewirelessmob

6、ilechannelbecausethetransmissionchannelenvironmentisverycomplicated．田尬mainservicesofrailwaycommunicationsystemarecontrolbusinessandschedulingbusiness，n圮purposeofthispaperistoadvancearesourceallocationstrategyabasedonOFDMcross-layersystemtoschedulebusinessof

7、railwaycommunication,andmakeOFDMtechnologyasareferencetorailwaycommunicationsystem．Atfirst，thispaperanalyzestheadvantagesanddisadvantagesofthecurrentschedulingalgorithmonMAClayersuchasthemaximumratiosetalgorithrns，RoundRobinschedulingalgorithm，andproportion

8、alfairschedulingalgorithm,aswellastheclassicaldynamicreSOBl"Ceallocationalgorithmonphysicallayer,suchaswaterfloodingalgorithm，greedyalgorithm，Chowalgorithm,andthenputforwardacross—layerdesignoncombined