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ID:38417240
大小:1.33 MB
页数:22页
时间:2019-06-12
《对两种类型的抗多径干扰分析方法》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、摘要本文以最小化系统总均方误差(SunMSE)为准则,迭代设计线性收发机的方案。该方案通过对接收机的改进设计,能够有效地避免传统MMSE设计过程中出现的拉格朗日乘子不易计算的缺点,大大降低设计复杂度。由于拉格朗日乘子有解析解,发射预编码矩阵也有闭式解,并且可以通过定点迭代算法有效解出。收端的接收机也不用基站下发,只要各自采用MMSE均衡即可。仿真结果证明该方法的有效性。基于数据块传输模型,将窄带MIMO并行干扰抵消接收机推广到宽带MIMO信道,在理想信道和信道估计下,通过仿真评估了所提出的宽带MIM
2、O并行干扰抵消接收机的性能。仿真结果表明:所建议的方案在宽带MIMO信道下的性能好于窄带MIMO信道下的性能,在宽带MIMO信道下,接收机可获得比窄带下更大的分集增益。本设计借助数学建模的有关方法,结合移动通信的有关知识,提出一种改进的抗多径干扰的接收模型,该模型主要通过系统模型、信道模型、信道的相关函数计算、波达方向估计算法、空自适应估计算法和空间自适应滤波算法等。并通过相应参数设置各种算法,应用MTLBEL进行仿真验证。结果证明本问题所提出的方法可以有效提高接受装置的抗干扰性能。关键词:多径干扰
3、,MIMO,空时信号处理,预编码,收发机联合设计19Onthetwotypesofanti-multipathinterferenceanalysismethodAbstract:AniterativelineartransceiverdesignschemeunderSumMeanSquaredError(SMSE)minimizationcriterionisproposed.Bymodifyingthestructureoftransceiver,thecomplexcomputationof
4、LagrangianmultiplierwithintraditionalMMSEtransceiverdesigncanbeeffectivelyobviated,andthusthewholesystemcomplexitycanbegreatlyreduced.BecausetheLagrangianmultiplierhasanalyticalsolutiontransmitprecodingmatrixalsohasclosed-formsolutionandcanbesolvedeasi
5、lywithfixed-pointiterations.TherecelivefilterisworkedoutindependentlywithMMSEcriterionateachterminal,andthedownlinksingalingofeachreceiverfilterformbasestationisnotnecessary.Simulationsdemonstratethattheproposedschemeiseffective.Parallelinterferencecan
6、cellationreceiverinflatfadingMIMOchannelwasdirectlyappliedtofrequencyselectionMIMOchannelbasedonblocktransmissionmodel.Theperformanceofproposedwidebandreceiverisevaluatedbasedonperfectchannelsandchannelestimationcasesbycomputersimulation.Simulationresu
7、ltsstatestheperformancesofMIMOspacetimeprocessingalgorithmsbasedonfrequencyselectivechannelhavetheadvantageoverthealgorithmsbasedonflatMIMOchannels,andthereceivercanobtainmorediversitygainthanitisinflatMIMOsystem.Withthisdesignthemethodofmathematicalmo
8、deling,combinedwiththeknowledgeofsmartantennaAnimprovedanti-multipathinterferencemodelforsmartantennareceivers,Themodelisprimarilythroughthesystemmodel,channelmodels,channelcorrelationfunction,theDOAestimationalgorithm,adaptiveestimatio
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