mimo-ofdm系统资源分配策略研究

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1、北京邮电大学硕士学位论文小区间干扰是蜂窝移动通信系统中的一个固有问题。在OFDMA系统中，小区间干扰协调是解决该问题的主流技术之一。首先基于SFR中的频率与功率分配规则，建立了以系统总体效用最优化为目标的多小区资源分配数学模型，并分析得到局部分配最优解。接着本文提出了一种基于频谱池思想的分布式半静态干扰协调方案，以其分布式特点能够在未来扁平式的接入网架构中实现。经仿真验证，提出方案能够有效改善小区边缘吞吐量性能。论文最后对全文进行了总结，并指出了今后的研究方向。关键词：MIMO．OFDM，信道质量反馈，资源分配，小区间干扰协调Ⅱ北京邮电大学硕十学位论文RESEARCHONRADI

2、ORESOURCEN删AGEMENTPOUCIESINMIMO．OFDMSYSTEMSNext．generationHG)mobilecommunicationsystemsareexpectedtosupportmultimediatrafficswithdiverseQoSrequirements．Inthephysicallayerof4Gairinterface，MIMOandOFDMareadoptedaskeytechnologiestoproviderobustnessandsignificantincreasesinspectralefficiency．Atthe

3、sametime，theefficientresourceallocationpolicyinMAClayerisalSOimportantinmaximizingtheresourceutilizationandthemultiuserdiversitygainwhileguaranteeingtheQoSrequirementsofdifferenttraffiCs．Therefore．themaintaskofthethesisisstudyingonresourceallocationprobleminMIMO—OFDMsystems，includinguplinkCQI

4、feedback，cross—layerpacketschedulingandinter-cellinterferencecoordination．necontentsofthethesisarepresentedasfollows：InMIM0．0FDM／】FDDsystems，frequentCQIfeedbackofallactiveusersisrequiredtoemploythefrequencyselectivepacketschedulingandlinkadaptation，andtheCQIfeedbackreductionschememustbedesign

5、edcarefullytoavoidsubstantialuplinkoverhcadamountwhileprovidingenoughinformationforBSscheduler．Basedontheanalysisofthebest-nandthethresholdbasedCQIfeedbackmechanisms，anovelhybridCQIfeedbackschemeisstudiedthroughsimulationwhichcombinestheadvantagesofthetwoclassicschemesbytakingthetr硪icandQoSco

6、nditionsofusersintoconsideration．ThehybridschemeCallachieveagoodtradeoffbetweenthedownlinkthroughputandtheuplinkfeedbackoverhcadwhileguaranteeingtheusers’fairness．InMIMO．OFDM／TDDsystems，itisassumedthatperfectdownlinkCSIcanbeobtainedatBSforthereciprocityofthe田DDchannels．Firstly,thesingle-traff

7、icpacketschedulingproblemisformulatedbyintroducingtheutilityfunctiontoevaluatetheusers’satisficationdegreewithm北京邮电人学硕士学位论文resourcesallocated．TheoptimizationobjectiveiSsettobemaximizingthesystemutilitywhileguaranteeingtheQoSrequirementsofdiff