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1、LANZHOUUNIVERSITYOFTECHNOLOGY毕业论文题目LTE小区间的干扰30摘要LTE(LongTermEvolution)即长期演进。之所以需要从3G演进到LTE,是由于近年来移动用户对高速率数据业务的要求,同时新型无线宽带接入系统的快速发展,给3G系统设备商和运营商造成了很大的压力。在LTE系统设计之初,其目标和需求就非常明确:降低时延、提高用户传输数据速率、提高系统容量和覆盖范围、降低运营成本。为了满足下一代无线通信系统低延时、高速率以及高速移动性等要求,3GPP提出了LTE(LongTermEvolution)技术。但小区内的多流干扰(Multi-streamint
2、erference,MSI)和小区间的干扰(Inter-CellInterference,ICI),是制约系统性能提升的一个瓶颈。因而,对LTE系统干扰消除技术的研究具有深远的意义。干扰是影响网络质量的主要因素之一,对通话质量、掉话、切换、拥塞以及网络的覆盖、容量等均有显著影响。如何降低或消除干扰是网络规划、优化的重要任务之一。对于小区间的干扰,本文首先分析比较了LTE系统中提出的三种小区间干扰抑制技术。本文重点分析了CoMP中的JP(JointProcessing)联合处理预编码方法,仿真分析了BD预编码方法,验证了JP预编码方法在LTE小区间干扰消除中的有效性。关键词:LTE多流干扰小
3、区间干扰CoMP联合预编码30AbstractLTE(LongTermEvolution)LongTermEvolution.Theneedfortheevolutionfrom3GtoLTE,mobileusersinrecentyearsduetothehighrateofdataservicerequirements,whiletherapiddevelopmentofnewwirelessbroadbandaccesssystemstothe3Gsystemequipmentmanufacturersandoperatorscausedalotofpressure.IntheLTE
4、systemdesignatthebeginning,itsgoalsandneedsisveryclear:toreducelatencyandimprovetheuserdatatransferrate,improvesystemcapacityandcoverageandreduceoperatingcosts.Inordertomeetthenextgenerationofwirelesscommunicationsystemslowlatency,high-speedandhigh-speedmobilityrequirements,3GPPproposedLTE(LongTer
5、mEvolution)technology.However,multi-streaminterference(Multi-streaminterference,MSI)withinthecellandinterference(Inter-CellInterference,ICI)betweencells,isanupgradeofthesystemperformancebottleneck.Thus,researchontheLTEsysteminterferencecancellationtechnologyhasfar-reachingsignificance.Interference
6、isoneofthemainfactorsaffectingthequalityofthenetwork,callquality,droppedcalls,handover,congestionandnetworkcoverage,capacity,etc.weresignificantlyaffected.Howtoreduceoreliminatetheinterferenceofnetworkplanning,optimizationofoneoftheimportanttasks.Forinter-cellinterference,thispaperanalyzesandcompa
7、restheLTEsystembetweenthethreeproposedcellinterferencesuppressiontechnology.ThisarticlefocusesontheanalysisofCoMPJP(JointProcessing)jointprocessingpre-codingmethod,simulationanalysisoftheBDpre-codingmethodtoverif