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1、基于D2D链路的测量与建模Abstract:Channelmeasurementsandmodellinghavebeenlongconsideredasthefoundationforeffectiveandefficientwirelesscommunicationsystemdesigns.Recently,therehasbeenanexplosivegrowthofresearchworkdedicatedtotheso-calleddevice-to-device(D2D)commu
2、nications.Inthemeantime,however,measurementsandmodellingofD2Dchannelsseemtosomewhatfallbehind.Topromoteresearchontheseaspects,inthisstudy,theauthorsprovideacriticaloverviewofthecurrentstateofresearchonD2Dchannels,andcomprehensivelydiscussfuturetrends
3、andresearchdirections.摘要：信道测量与建模被长期作为无线通信系统设计实用性和高效性的基础。近年，对于所谓device-to-device（D2D）通信的研究工作呈现出爆发式增长，但同时关于D2D信道的测量与建模看起来没有同步进行。为了加深对于这些方向上的研究，本文中作者对D2D信道的当前研究现状做出客观的综述，并概要地讨论了未来趋势和研究方向。1.introduction1.简介Inrecentyears,device-to-device(D2D)communication
4、shavegainedmuchattentiontomeettheincreasingdemandofwirelessdataserviceinspiteoftheincreasinglyscarcefrequencyspectrum[1].TheD2Dcommunicationsaredefinedastheinformationexchangeviaadirectlinkbetweentheendusers,asopposedtotransmittingandreceivingsignals
5、throughthecellularbasestation(BS).D2Dcommunicationsbehaveasanunderlaytothecellularnetwork,whichcanachievecellularcontrolledshort-rangedirectdatatransmissionforlocalareaservicesbyreusingthecellularspectrum,leadingtobothspectralefficiencyimprovementand
6、cellthroughputenhancement[2].Intraditionalcellularnetworks,theradioresourceinacellcanbeallocatedtoonlyonecellularuserequipment(UE)link.However,incellularnetworkswithD2Dcapability,multipleD2Dlinkscansharearesourceblockbyspatiallyreusingtheresourcebloc
7、kwithinacell.Asamatteroffact,theD2Dconcepthasbeenproposedlongtimeagoforadhocnetworks,forexample,WLANandvehicularnetworks.Recently,theroadsideinfrastructurecontrolledD2Dconcepthasbeenfirstproposedforvehicularcommunications[3].近年来，随着频谱资源越来越稀缺，为满足无线数据业务
8、的增长需要，device-to-device（D2D）通信被广泛关注[1]。D2D通信指的不是通过蜂窝基站（BS）发送和接收信号，从而在终端用户间建立一个直接相连的信息交换信道。D2D通信作为蜂窝网络的底层可以通过复用蜂窝网络频谱资源，实现多小区控制下本地短距离直接数据传输服务，从而提高了频谱效率，增加了小区吞吐量[2]。在传统的蜂窝网络中，一个小区的频率资源只能分配给一个用户设备（UE）连接，但是，在应用终端直联（D2D）技术的蜂窝网络中，多个D2D连接可以共享一个小区内空间复用的资源块，事实
