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1、直序扩频通信中窄带干扰抑制算法研究专业学生姓名班级学号指导教师完成日期直序扩频通信中窄带干扰抑制算法的研究摘要：扩频通信是指用于传输信号的信道带宽远远大于信号自身带宽的一种通信方式，它在抗噪声、抗干扰、抗多径衰落、码分多址、信号隐蔽性和保密性等方面具有较传统无线通信方式无可比拟的优势，从而与光纤通信、卫星通信一同被誉为信息时代三大主流通信传输方式。由于扩频通信独具特色，自诞生之日起，就受到军方的极大重视。近十年来，随着信息技术的迅猛发展与日益普及，扩频通信技术已在军用和民用通信领域得到广泛应用，并伴随GPS卫星定位、CDMA或3G手机等产品迅速进入大众生活。介绍
2、扩频通信的基本原理，主要特点和工作方式，重点讨论了直序扩频通信中窄带干扰抑制算法的研究，列举了4种干扰抑制方案，经过分析，最后采用FFT重叠变换干扰抑制算法，并用Matlab软件中的Simulink模块对其进行仿真，仿真中信息数码率为1Kb/s,扩频码率为255Kb/s，载波为510KHz,高斯白噪声信噪比为10dB,单音窄带干扰中心频率为510KHz,信干比为-2dB。仿真结果表明，基于FFT的干扰抑制技术能够有效的抑制干扰，达到预期的效果。关键词：扩频通信；窄带干扰；直序扩频；FFT重叠变换。ResearchofNarrowbandInterferenceS
3、uppressionAlgorithminDirectSequenceSpreadSpectrumCommunicationAbstract:Thespreadspectrumcommunicationmeansthatthechannelbandwidthfortransmittingsignalismuchgreaterthanthebandwidthofthesignalitself.Ithasunparalleledadvantagesforanti-noise,interference,resistancetomultipathfading,coded
4、ivisionmultipleaccess,signalconcealmentandsecrecyandsooncomparewithatraditionalwirelesscommunication,thusitisknownasoneofthethreemainstreamcommunicationsintheinformationagewiththefiberopticcommunicationsandthesatellitecommunications.Becausethespreadspectrumcommunicationisunique,since
5、thedateofitsbirth,itwaspaidattentiontobymilitary.Overthepastdecade,withtherapiddevelopmentofinformationtechnologyandtheincreasingpopularity,spreadspectrumcommunicationtechnologyhasbeenwidelyusedinthefieldofmilitaryandciviliancommunication.andquicklycomeintopubliclifeaccompanyingtheGP
6、Ssatellitepositioning,CDMAor3Gmobilephonesandotherproducts.Thebasicprinciplesofspreadspectrumcommunication,themaincharacteristicsandworkingmethodsareintroduced,narrowbandinterferencesuppressionalgorithmisdiscussedinthedirectsequencespreadspectrumcommunication.Fourkindsofinterferences
7、uppressionschemesarelisted,afteranalysis,andfinallylappedtransforminterferencesuppressionalgorithmbasedonFFTissimulatedusingsimulinkofMATLAB.Insimulation,speedofdigitalinformationis1Kb/s,rateofspreadingcodeis255Kb/s,thefrequencyofcarrieris510KHz,SNRofGaussianwhitenoisecommunicationch
8、annelis10dB,
