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中继蜂窝网络下行协作网络编码中继方法(英文) RelayMethodsforDownlinkCooperativeNetworkCodinginRelayCellularNetworks Introduction Relaycellularnetworksareatypeofwirelesscommunicationnetworkthatusesrelaystoextendtherangeandimprovethequalityofthecommunication.Thesenetworkscanbedesignedtoprovideeitheruplinkordownlinkcommunicationbetweenbasestationsandmobiledevices.Inthedownlinkdirection,dataistransmittedfromthebasestationtomultipleuserssimultaneously.Cooperativenetworkcodingisatechniquethatcanbeusedinrelaycellularnetworkstoimprovetheperformanceofthedownlinkcommunicationbyutilizingthecooperationoftheneighboringrelays. CooperativeNetworkCoding Cooperativenetworkcodingisatechniquethatenablesagroupofnodestoshareandcombinetheirdatapacketstocreatemoreefficienttransmissions.Therelaysinacellularnetworkcanusethistechniquetoimprovethethroughputandreliabilityofthedownlinkcommunication.Intraditionalcellularnetworks,eachuserreceivesaseparatetransmissionfromthebasestation.Inacooperativenetwork,therelayscancombinepacketsfrommultipleusersandforwardthemtotheuserssimultaneously,reducingthetotalnumberoftransmissionsneeded. NetworkCodingandRelaySelection Networkcodingalgorithmscanbeappliedtotherelayselectionprocesstoimprovetheperformanceofcooperativenetworkcoding.Whenselectingarelaytotransmitapacket,thealgorithmconsidersallavailablerelaysandcalculatesthetransmissionrateforeachone.Therelaywiththehighesttransmissionrateisthenselectedtotransmitthepacket.Thisprocessallowstherelaystooptimizetheirtransmissionsandimprovetheoverallperformanceofthenetwork. RelaySelectionandNetworkCoding Inadditiontotherelayselectionprocess,networkcodingalgorithmscanalsobeappliedtothetransmissionofpacketsbytheselectedrelay.Whenapacketisreceivedbytheselectedrelay,thealgorithmdeterminesthelinearcombinationofthepacketsthatshouldbetransmittedtoeachusertoachievethehighestpossiblethroughput.Theselectedrelaythencombinesthepacketsandtransmitsthemsimultaneouslytotheusers. PerformanceEvaluation Severalstudieshaveevaluatedtheperformanceofcooperativ