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时间:2019-11-26
《基于误码率准则的窄带干扰抑制算法性能分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第33卷第5期2014年9月飞行器测控学报JournalofSpacecraftTT&CTechnologyV01.33No.5Sep.2014引用格式:李健伟,李志强,朱文明,等.基于误码率准则的窄带干扰抑制算法性能分析[J].飞行器测控学报,2014,33(5):435—440.LiJianwei,LiZhiqiang,ZhuWenming,eta1.Analysisoftheperformanceofnarrow-bandinterferencesuppressionalgorithmbasedonBERcriteria
2、[J].JournalofSpacecraftTT&CTechnology,2014,33(5):435—440.基于误码率准则的窄带干扰抑制算法性能分析李健伟,李志强,朱文明,陈啸,马赫(解放军理工大学通信工程学院·南京·210007)摘要:采用有效的窄带干扰抑审l技术,可极大地改善扩频通信系统的性能。首先详细介绍了频域干扰抑制算法的基本思想,给出了算法实现的模块框图;其次具体分析了算法实现的关键技术:重叠加窗,背景噪声估计,干扰门限确定及干扰消除策略;最后以误码率作为干扰消除算法性能的评判标准,仿真分析了频域窄带干扰抑制技
3、术中干扰强度、干扰频带宽度、干扰频率位置、干扰消除门限、陷幅值、加窗重叠度等因素对系统误码率的影响,为在不同条件下算法最佳参数的选取提供了依据。仿真结果表明:当干扰消除门限值取4盯F,陷幅值取2盯F~6aF,加窗重叠度为50%时,该算法可获得最佳抗干扰性能。关键词:直接序列扩频;频域干扰抑制;窄带干扰;性能分析中图分类号:V556;TN914.42文献标志码:A文章编号:1674—5620(2014)05—0435—06DOI:10.7642/j.issn.1674—5620.2014—05—0435—06Analysisof
4、thePerformanceofNarrow-BandInterferenceSuppressionAlgorithmBasedonBERCriteriaLIJianwei,LIZhiqiang,ZHUWenming,CHENXiao,MAHe(InstituteofCommunicationsEngineering,PLAUniversityofScienceandTechnology,Nanjing210007)Abstract:Narrow—bandinterferencesuppressioncanbeusedtOgr
5、eatlyimprovetheperformanceofspreadspectrumcommunicationsystems.Followingintroductionofthebasicideaoffrequencydomaininterferencesuppressionalgo—rithm,thepapergivesablockdiagramforalgorithmimplementation.Keytechnologiesforimplementationoftheal—gorithm,overlappingwindo
6、ws,estimationofbackgroundnoise,interferencethresholddeterminationandinterfer—encecancellationstrategies,areanalyzed.TakingBER(BitErrorRate)astheevaluationcriteriafortheperform—anceoftheinterferencecancellationalgorithm,simulationisdoneonfactorsofinfluenceonsystemBER
7、innarrow-bandinterferencesuppressiontechnologiesinthefrequencydomain,includinginterferenceintensity,interferencebandwidth,interferencefrequency,interferencecancellationthreshold,trapamplitudeandwindowedoverlapping.Theresultprovidesabasisforselectionofthebestparamete
8、rsforthealgorithmunderdifferentconditions.Simula—tionshowsthatthealgorithmreachestheoptimalperformanceofanti—-interferenceabilitywhenthein
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