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1、沈陽理工大學(xué)學(xué)士學(xué)位論文直接序列擴(kuò)頻通信仿真實(shí)現(xiàn)摘要直接序列擴(kuò)頻通信系統(tǒng)因其抗干擾性強(qiáng)、隱蔽性好、易于實(shí)現(xiàn)碼分多址(CDMA)、抗多徑干擾、直擴(kuò)通信速率高等眾多優(yōu)點(diǎn),在個(gè)人通信網(wǎng)、無線局域網(wǎng)、第三代移動(dòng)通信、衛(wèi)星通信以及軍事戰(zhàn)術(shù)通信等領(lǐng)域得到廣泛應(yīng)用。本文以擴(kuò)頻通信理論為基礎(chǔ),用MATLAB工具箱中的Simulink通信仿真模塊和MATLAB函數(shù)對(duì)直接序列擴(kuò)頻通信系統(tǒng)進(jìn)行了仿真分析,在給定條件下運(yùn)行了仿真程序,得到了預(yù)期的結(jié)果。本文具體介紹了擴(kuò)頻通信的國內(nèi)外發(fā)展背景和發(fā)展趨勢(shì),闡明了擴(kuò)頻通信在當(dāng)今社會(huì)的重要性,擴(kuò)頻通信是70年代中期迅速發(fā)展
2、起來的一種新型的通信系統(tǒng),它抗干擾能力、抗衰落能力、抗多徑的能力是上述其它通信系統(tǒng)無與倫比的。根據(jù)擴(kuò)頻通信的特點(diǎn)和原理,對(duì)擴(kuò)頻通信進(jìn)行具體分析如擴(kuò)頻同步,擴(kuò)頻碼序列,擴(kuò)頻增益和抗干擾容限等相關(guān)問題進(jìn)行了具體研究,同時(shí)介紹了擴(kuò)頻通信在各個(gè)領(lǐng)域的應(yīng)用,說明了其重要性所在。關(guān)鍵詞:擴(kuò)頻通信;同步;調(diào)制;Simulink仿真;解調(diào)48沈陽理工大學(xué)學(xué)士學(xué)位論文AbstractThedirectsequencespreadspectrumcommunicationsystemiswidelyusedinvariousareas,suchasperson
3、alcommunication,networks,wirelesslocalareanetwork,thethirdgenerationmobilecommunications,satellitecommunicationsandmilitarytacticalcommunications,becauseofitsmanyadvantages:stronganti-interference,goodforhiding,easytoimplementcodedivisionmultipleaccess(CDMA),anti-multipath
4、interference,andhigherDSSScommunicationrate.Basedonspreadspectrumcommunicationtheory,ByusingSimulink,andMATLABfunction,thedirectsequencespreadfrequencycommunicationwassimulated,andunderthegivenconditions,thesimulationprogramrunningtheexpectedresults.Thearticlespecificallyo
5、nthespread-spectrumcommunicationsbackgroundandthedevelopmentofdomesticandinternationaldevelopmenttrends,clarifythespreadspectrumcommunicationintoday'ssocietyoftheimportanceofspreadspectrumcommunicationisthemid-1970suptotherapiddevelopmentofanewtypeofcommunicationssystem,an
6、ditsanti-interferencecapability,Anti-Fadingcapacity,multi-pathresistanceistheabilityoftheseothercommunicationsystemsincomparable.Accordingtospread-spectrumcommunicationsfeaturesandprinciplesofspreadspectrumcommunicationsforaspecificanalysissuchasspreadspectrumsynchronizati
7、on,thespreadingcodesequences,SpreadingGainandinterferencetolerance,andotherissuesrelatedtothespecificresearch,Meanwhileonthespreadspectrumcommunicationinvariousfieldsofapplication,showsitsimportancelies.Finally,basedonthesimulationsoftwareMATLABSimulinktoolsfordynamicsimul
8、ation,comeoutwithacompletesimulationresults,usingSimulinksummedupthebasicmethodsandsteps.