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1、第33卷第5期2014年9月飛行器測控學(xué)報JournalofSpacecraftTT&CTechnologyV01.33No.5Sep.2014引用格式:李健偉,李志強,朱文明,等.基于誤碼率準則的窄帶干擾抑制算法性能分析[J].飛行器測控學(xué)報,2014,33(5):435—440.LiJianwei,LiZhiqiang,ZhuWenming,eta1.Analysisoftheperformanceofnarrow-bandinterferencesuppressionalgorithmbasedonBERcriteria
2、[J].JournalofSpacecraftTT&CTechnology,2014,33(5):435—440.基于誤碼率準則的窄帶干擾抑制算法性能分析李健偉,李志強,朱文明,陳嘯,馬赫(解放軍理工大學(xué)通信工程學(xué)院·南京·210007)摘要:采用有效的窄帶干擾抑審l技術(shù),可極大地改善擴頻通信系統(tǒng)的性能。首先詳細介紹了頻域干擾抑制算法的基本思想,給出了算法實現(xiàn)的模塊框圖;其次具體分析了算法實現(xiàn)的關(guān)鍵技術(shù):重疊加窗,背景噪聲估計,干擾門限確定及干擾消除策略;最后以誤碼率作為干擾消除算法性能的評判標準,仿真分析了頻域窄帶干擾抑制技
3、術(shù)中干擾強度、干擾頻帶寬度、干擾頻率位置、干擾消除門限、陷幅值、加窗重疊度等因素對系統(tǒng)誤碼率的影響,為在不同條件下算法最佳參數(shù)的選取提供了依據(jù)。仿真結(jié)果表明:當干擾消除門限值取4盯F,陷幅值取2盯F~6aF,加窗重疊度為50%時,該算法可獲得最佳抗干擾性能。關(guān)鍵詞:直接序列擴頻;頻域干擾抑制;窄帶干擾;性能分析中圖分類號:V556;TN914.42文獻標志碼:A文章編號: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