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1、天线端口(antennaport)在LTE中，就有天线端口的定义和使用，而且还分上下行进行的定义，上行的定义如下：Anantennaportisdefinedsuchthatthechanneloverwhichasymbolontheantennaportisconveyedcanbeinferredfromthechanneloverwhichanothersymbolonthesameantennaportisconveyed.Thereisoneresourcegridperantennaport.Theantennaportsusedfortransmissionofaphysica
2、lchannelorsignaldependsonthenumberofantennaportsconfiguredforthephysicalchannelorsignalasshowninTable5.2.1-1.Theindexpisusedthroughoutclause5whenasequentialnumberingoftheantennaportsisnecessary.Table5.2.1-1:AntennaportsusedfordifferentphysicalchannelsandsignalsPhysicalchannelorsignalIndexpAntennapor
3、tnumberpasafunctionofthenumberofantennaportsconfiguredfortherespectivephysicalchannel/signal124PUSCH01020401-21412-423-.43SRS01020401-21412-423-43PUCCH,SPUCCH0100200-1-201-而对于下行来说，协议的定义如下：Anantennaportisdefinedsuchthatthechanneloverwhichasymbolontheantennaportisconveyedcanbeinferredfromthechannelove
4、rwhichanothersymbolonthesameantennaportisconveyed.ForMBSFNreferencesignals,positioningreferencesignals,UE-specificreferencesignalsassociatedwithPDSCH,demodulationreferencesignalsassociatedwithSPDCCH,anddemodulationreferencesignalsassociatedwithEPDCCH1therearelimitsgivenbelowwithinwhichthechannelcanb
5、einferredfromonesymboltoanothersymbolonthesameantennaport.Thereisoneresourcegridperantennaport.ReferenceSignalTypeAssociatedAntennaPortsCell-SpecificReferenceSignalP=0,P0,l),Pe0,l,2,3MBSFNp=4UE-SpecificReferenceSignalp=5,p=6,p=p=8,one/severalofp7,8,9,10,ll,12,13,14DMRSforEPDCCHp107,108,109,110Positi
6、oningReferenceSignalp=6P=I5,p=15,16,CSI Reference signalp=15,16,17,18,p=15,16,17,18,19,20,2122,p=15,16,17,18,19,20,21,22,23,24,25,26,p=15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30天线端口是逻辑概念，而不是物理概念；每个天线端口代表一个特定的信道模型；通过特定天线端口传输的信道可以使用端口分配的参考信号来完成（这就是为什么每个天线端口都有自己的参考信号）。如下图所示，首先在预编码过程中引入天线端口，每个天线端口将
7、生成自己的资源网格。Each antenna port data goes through separate Resource Element Mapper也就是说COCIeWOrdS在层映射后，数据需要组合能后在预编码环节进行再分配到每个天线端口，在B点是数据和RE资源进行映射，也是需要通过不同的天线端口进行。C点就是典型的资源映射情况，在不同的天线端口有不同资源块，D点出去就是逻辑端口和物理天线之间的对应了，比如8个物理天线端口分为两组，然后每组形成一个逻辑天线端口。C点的例子如下：RE that carries Reference DataB Kt tnat carry PDbGM以上是
8、 4X4 MIMO, TM3 或 TM4在NR中，天线端口的定义如下：Anantennaportisdefinedsuchthatthechanneloverwhichasymbolontheantennaportisconveyedcanbeinferredfromthechanneloverwhichanothersymbolonthesameantennaportisconveyed.ForDM-RSassociatedwithaPDSCH,thechanneloverwhichaPDSCHsymbolononeantennaportisconveyedcanbeinferredfrom
9、thechanneloverwhichaDM-RSsymbolonthesameantennaportisconveyedonlyifthetwosymbolsarewithinthesameresourceasthescheduledPDSCHzinthesameslot,andinthesamePRGasdescribedinclause5.1.2.3ofTS38.214.Twoantennaportsaresaidtobequasico-locatedifthelarge-scalepropertiesofthechanneloverwhichasymbolononeantennapor
10、tisconveyedcanbeinferredfromthechanneloverwhichasymbolontheotherantennaportisconveyed.Thelarge-scalepropertiesincludeoneormoreofdelayspread,Dopplerspread,Dopplershift,averagegain,averagedelay,andspatialRxparameters.各类物理信道、信号的天线端口对应如下：Channe1/SignalAntennaPortsPDSCHAntennaportsstartingwith1000PDCCHAn
11、tennaportsstartingwith2000CSI-RSAntennaportsstartingwith3000SS/PBCHAntennaportsstartingwith4000PUSCH/DMRSAntennaportsstartingwith0SRSAntennaportsstartingwith1000PUCCHAntennaportsstartingwith2000PRACHAntennaport4000在预编码处理中，DMRS映射中火器值如下:DM-RSantennaport“REDM-RSConfigurationtype1DM-RSConfigurationtype2resourceElementOffsetresourceElementOffset0001101100011011002680167124810167021379238933591138924-4510115-510114
