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vc183 基于LMS算法的自适应均衡器(滤波器)【毕业论文 45页 2.6万 doc】 .docvc183 基于LMS算法的自适应均衡器(滤波器)【毕业论文 45页 2.6万 doc】 .doc

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安徽理工大学毕业设计(论文)-1-目录摘要............................................................................................................................................3Abstract......................................................................................................................................4第一章概述........................................................................................................................51.1、通信系统中的失真分析.............................................51.1.1、数字基带传输系统模型..............................................................................51.1.2、通信系统中的噪声干扰..............................................................................51.1.3、通信系统的传输特性..................................................................................71.1.4、均衡技术......................................................................................................81.2、自适应滤波技术...................................................81.2.1、自适应滤波理论..........................................................................................91.2.2、自适应滤波器的研究现状..........................................................................91.3、MATLAB与系统仿真...............................................101.4、硬件描述语言VHDL...............................................101.5、主要研究内容与目标..............................................121.5.1、论文的研究目标........................................................................................121.5.2、论文的研究意义........................................................................................121.5.3、论文的章节安排........................................................................................13第二章自适应滤波原理与应用............................................................................................142.1、自适应滤波原理..................................................142.1.1、自适应滤波器的分类................................................................................142.1.2、自适应滤波器的基本构成........................................................................152.1.3、与普通滤波器的区别................................................................................152.1.4、自适应过程................................................................................................162.2、自适应滤波结构..................................................162.2.1、单位脉冲响应类型....................................................................................172.2.2、滤波器的实现结构....................................................................................172.2.3、横向型FIR自适应滤波器........................................................................192.3、自适应滤波器的应用..............................................202.3.1、主要应用类型............................................................................................202.3.2、自适应均衡器............................................................................................20第三章自适应算法的研究..................................................................................................223.1性能测量方法....................................................223.1.1、最佳滤波器准则........................................................................................223.1.2、均方误差(MSE)性能测度.........................................................................233.1.3、自适应算法的性能指标............................................................................233.2、最小均方误差算法................................................243.2.1、LMS算法结构分析...................................................................................243.2.2、LMS算法MATLAB仿真........................................................................253.2.3、改进型LMS算法......................................................................................263.3、自适应盲均衡算法................................................263.3.1、盲均衡器....................................................................................................27安徽理工大学毕业设计(论文)-2-3.3.2、常数模算法................................................................................................283.3.3、改进型CMA算法.....................................................................................29第四章自适应滤波器的FPGA实现..................................................................................294.1EDA技术概述....................................................304.1.1、超大规模可编程逻辑器件........................................................................304.1.2、VHDL程序设计........................................................................................314.1.3、AlteraQuartusII平台................................................................................334.2设计说明........................................................334.2.1、正负数的处理............................................................................................334.2.2、定点运算数制的确定................................................................................344.2.3、乘加器的实现............................................................................................364.2.4、快速加法器的实现....................................................................................384.3LMS算法的实现..................................................384.3.1、LMS算法的计算过程...............................................................................384.3.2、FPGA的基本结构.....................................................................................394.3.3、时序逻辑控制............................................................................................414.3.4、仿真测试....................................................................................................414.4本章小结........................................................42致谢..........................................................................................................................................43参考文献..................................................................................................................................44安徽理工大学毕业设计(论文)-3-摘要自适应滤波器是当今自适应信号处理中最为活跃的研究课题之一。自适应滤波器有广阔的应用前景,特别是在数字通信领域,自适应均衡是一种成熟技术,对包括语音频带、微波、对流层散射无线通信、有线电视调制解调器等数字通信系统影响最大。自适应滤波器的研究工作主要包括自适应算法和硬件实现。通过对自适应滤波原理、滤波结构、最佳滤波准则、自适应算法分析、比较和总结,选出了适合于FPGA硬件实现的滤波结构和自适应算法,即基于LMS自适应算法的FIR横向滤波器。在MATLAB平台上,编写自适应算法的M文件,进行系统仿真,并对滤波器的阶数、收敛步长、跟踪速度和稳态误差进行了详细的分析和研究,得出了合理的结果,为自适应滤波器的硬件实现打下了良好的理论基础。在QuartusII平台上,用VHDL语言描述了自适应滤波器的结构,解决了正负数运算、定点数运算、乘累加运算等细节问题。在ALTERA公司的StratixII系列的EP2S30F484C3(Advanced)芯片上,实现了基于LMS自适应算法的FIR横向滤波器的硬件设计与逻辑综合,并进行了模拟仿真,得出了正确的结果。关键词:自适应均衡,LMS算法,MATLAB仿真,VHDL安徽理工大学毕业设计(论文)-4-AbstractTheresearchofadaptivefilterisoneofthemostactivitytasks.Theadaptivefilterhasbeenwidelyusedinvarioustechniquefields,particularlyindigitalcommunication,adaptiveequalizationisakindofmaturetechnology,ithavegreatimpactondigitalcommunicationsystemsuchasAudiofrequency,microwave,wirelesscommunicationviatroposphericscatter,modemofcableTVandsoon.Theresearchactivitiesaboutadaptivefilterinvolvetwoaspects:adaptivealgorithmandhardwarerealization.ThesuitablefilterarchitectureandadaptivealgorithmforFPGAhardwarerealizationaredetermined—LMSalgorithmhorizontalstructuralFIRfilter,basedontheanalyses,comparisonsandsummarizationofadaptivefilterprinciple,thearchitectureoffilter,optimumfilterprincipleandtheadaptivealgorithms.OntheMATLABplatform,theMfileiswrittenandsystemsimulationexperimentisputon.Themainparameterssuchasnumberoffilterexponent,step-size,track-speed,errorsandsoonarediscussed,thatprovidedasolidfoundationforthehardwarerealizationofadaptivefiltersOntheQuartusIIplatform,theadaptivefilterisdescribedanddesignedbyVHDL.Thedifficultiesofplusandminusnumberoperation,fixedpointnumberoperation,multiplyandaddoperationaresolved.UltimatelythehardwaredesignandlogicalsynthesisoftheLMSalgorithmhorizontalstructuralFIRfilterisrealizedusingEP2S30F484C3(Advanced)deviceofStratixIIfamilyofALTERACompany,thesimulationisdoneandalsotheresultsiscorrect.Keywords:adaptiveequalization,LMSalgorithm,MATLABsimulation,VHDL
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