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1、DesignandImplementationofSpreadSpectrumCommunicationSystemBasedonMATLABAbstract:Thespreadspectrumcommunicationsystemistoexpandthespectrumofthebasebandsignaltoaverywidefrequencyband,andthentransmittedtheupcomingsentinformationaremodulatedwithapseudo-randomcode(spreadingsequence:SpreadSequence).Wetra
2、nsmittheinformationafterrealizingspreadspectrum,thereceivingsideusesthesameencodingdemodulationandrelatedhandling,restoretheoriginaldata.Inthispaper,weresearchtheDesignandImplementationofDirectSequenceSpreadSpectrum(DirectSequenceSpreadSpectrum).ThepaperrealizestheDirectSequenceSpreadSpectrum(DSSS)
3、throughresearchingthetheoreticalbasisoftheDirectSequenceSpreadSpectrum(DSSS)andtheworkingmethods.Inthecontextoftherapiddevelopmentofwirelesscommunication,inthispaper,fortheapplicationofspreadspectrumtechnologyinthesignaltransmission,theuseoftheMATLABtechnicalrealizeacompletespreadspectrumcommunicat
4、ionsystem.Itisdividedintospreading,despreading,thesimulationmodule,throughrepeatedtests,inthecaseoflowbiterrorrate,itrealizesgoodfunctionofthesystemofspreadspectrum.Fortheinterferenceinsignaltransmission,thispapermakeaspecificinterferencemeasurementandanalysis,throughtheBERsimulationcurvestoanalyse
5、thevalidityofdirectsequencespreadspectrumintheinhibitionofsignalinterference.Keyword:DirectSequenceSpreadSpectrum;Thedespreading;BER;Sinusoidalinterference;Narrow-bandinterference.Classification:TN914.42III目次摘要I目次III1緒論11.1引言11.2擴(kuò)頻通信的歷史背景21.2.1擴(kuò)頻通信的應(yīng)用21.2.2擴(kuò)頻通信的研究歷史21.3擴(kuò)頻通信的基本原理31.4本論文的安排42擴(kuò)頻通信系統(tǒng)的設(shè)
6、計(jì)方案52.1擴(kuò)頻通信系統(tǒng)的特點(diǎn)52.2擴(kuò)頻方式的選擇52.2.1直接序列擴(kuò)頻系統(tǒng)52.2.2跳頻擴(kuò)頻系統(tǒng)72.2.3跳時(shí)系統(tǒng)92.2.4寬帶線性調(diào)頻102.3典型擴(kuò)頻系統(tǒng)的優(yōu)缺點(diǎn)比較102.4擴(kuò)頻與解擴(kuò)模塊的實(shí)現(xiàn)112.5噪聲與干擾模塊的選擇與實(shí)現(xiàn)132.5.1信道噪聲的選擇與實(shí)現(xiàn)132.5.2信道干擾的選擇與實(shí)現(xiàn)142.6差錯(cuò)計(jì)數(shù)器模塊的實(shí)現(xiàn)152.7直擴(kuò)系統(tǒng)的程序編譯153程序仿真過(guò)程分析163.1MATLAB仿真軟件簡(jiǎn)介163.2直擴(kuò)系統(tǒng)的仿真思路163.3.1直擴(kuò)系統(tǒng)抗正弦干擾仿真163.3.2直擴(kuò)系統(tǒng)抗窄帶干擾仿真184仿真結(jié)果及其分析194.1抗正弦干擾仿真結(jié)果及分析194.2
7、抗窄帶干擾仿真及結(jié)果分析215總結(jié)22參考文獻(xiàn)23III附錄A25作者簡(jiǎn)歷29學(xué)位論文數(shù)據(jù)集30III中國(guó)計(jì)量學(xué)院本科畢業(yè)設(shè)計(jì)(論文)1緒論1.1引言擴(kuò)頻技術(shù)是從20世紀(jì)50年代的中期開(kāi)始發(fā)展起來(lái)的,但是在80年代初期的時(shí)候,軍事通信和安全通信仍然是擴(kuò)頻通信的主要應(yīng)用方向。隨著人與人之間的溝通渠道的高速發(fā)展及全球衛(wèi)星定位系統(tǒng)(GPRS)的應(yīng)用,擴(kuò)頻通信的使用者人數(shù)成指數(shù)增長(zhǎng),目前已經(jīng)突破一億五千萬(wàn)用戶。無(wú)線通