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中国科学院大学学报 ›› 2008, Vol. 25 ›› Issue (2): 238-243.DOI: 10.7523/j.issn.2095-6134.2008.2.015

• 论文 • 上一篇    下一篇

基于DSPBuilder全数字接收机定时载波同步算法的实现

陈舒1,2, 刘奇佳, 刘昌清, 赵克明   

  1. 1中国科学院中国遥感卫星地面站,北京100086 2中国科学院研究生院,北京100049 3清华大学电子工程系,北京100084
  • 收稿日期:1900-01-01 修回日期:1900-01-01 发布日期:2008-03-15

Implementationoftimingandcarrierphaserecoveryin alldigitalreceiversbasedonDSPBuilder

CHENShu, LIUQiJia, LIUChang Qing, ZHAOKeMing   

  1. 1ChinaRemoteSensingSatelliteGroundStation,ChineseAcademyofSciences,Beijing100086,China; 2GraduateUniversity,ChineseAcademyofSciences,Beijing100049,China; 3DepartmentofElectronicEngineering,TsinghuaUniversity,Beijing100084,China
  • Received:1900-01-01 Revised:1900-01-01 Published:2008-03-15

摘要: 讨论了全数字接收机中同步算法的设计与实现,给出了基于Gardner反馈环路的定时
同步算法和基于数字Costas环的载波相位补偿算法的定点实现方案,并在Altera公司的DSP Builder上实现了该算法.计算机仿真和FPGA(FieldProgrammableGateArray)实现都验证了其有 效性,测试结果表明,该系统信噪比恶化小于15dB,时钟捕捉带大于±1%,载波频差捕捉带 大于±4%.

关键词: 全数字接收机, Gardner算法, 数字Costas环, DSPBuilder

Abstract: in this paper, thedesign and implementation ofthesynchronization algorithmsin alldigitalcommunicationreceiversareintroduced.ThefixedpointtimingrecoveryalgorithmbasedontheGardnerfeedbackloopapproachandthecarrierrecoveryalgorithmusingdigitalCostaslooparerealizedviaAlteraDSPBuilder.BoththecomputersimulationandtheFPGArealizationdemonstratethevalidityofthealgorithms.ResultsshowthattherealizedsystemhasgoodperformancewiththeSNRdegradationlessthan15dB,theacquisitionrangesoftimingrecoveryandcarrierrecoverylargerthan±1% and±4%,respectively.

Key words: Gardneralgorithm, digitalCostasloop, DSPBuilder

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