OFDM在CMMB中的应用及实现

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1、上海交通大学硕士学位论文OFDM在CMMB中的应用及实现姓名：汤玉珺申请学位级别：硕士专业：软件工程指导教师：付宇卓;钱松20080524IMPLEMENTATIONOFOFDMAPPLIEDINCMMBRECEIVERSYSTEMABSTRACTThispaperintroducesOFDMapplicationsinChinaMobileMultimediaBroadcasting(CMMB)receiver.SinceCMMBiswirelesscommunicationsystemandusuallyadopte

2、dinminihandhelddevices,ithascriticalrequirementforthechipsizeanditspowerconsumption.ThispaperfocusesonFastFourierTransformation(FFT)andbitde-interleavinginOFDM.Throughapplyingoptimizedalgorithms,itminimizesthechipsizeandpowerconsumption.TheFFTdesignfocusonminimiz

3、ethestorageconsumptionwithinenoughoperational2speedandtheadvantageofFFTdesignreliesonradix2algorithm,dualramsreadandwrite;Concernedwithprecisionadjustment,itadoptsdecimalpointshiftinginfix-pointbitwidthwhichavoidstheoverflowandensurestheprecisionoftheinternalresu

4、lts.Theinterleaver’simplementationwhichbasedontwocrossmodes,comparedwithtraditionaldesign,alsocontributestothelessmemorysize.Ithasbeentestedthattheoptimizedalgorithmseffectivelylowersdownthesizeand2power.Therealchipsizeis10.217mm,andthepowerconsumptionis53.485mW.

5、ThealgorithmsinthispaperhavebeenappliedinrealworldprojectofCMMBreceiverchipdesignandtheyhavebeenprovedtobeastableandefficientmethod.KEYWORDS:CMMB,OFDM,FFT,De-interleaving图片目录图1CMMB系统框图.................................................................错误！未定义书签。图2STi

6、Mi系统框图...................................................................错误！未定义书签。图3比特交织...............................................................................错误！未定义书签。图4BPSK星座映射方案............................................................错误！未定义书签。图5CMMB

7、系统的基于时隙的帧结构.....................................错误！未定义书签。图6信标结构...............................................................................错误！未定义书签。图7OFDM符号..........................................................................错误！未定义书签。图8保护间隔间的交叠...........

8、....................................................错误！未定义书签。图9OFDM发送接收系统..........................................................错误！未定义书签。图10基2的DIF蝶形运算单元....