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1、沈阳理工大学学士学位论文直接序列扩频通信仿真实现摘要直接序列扩频通信系统因其抗干扰性强、隐蔽性好、易于实现码分多址（CDMA）、抗多径干扰、直扩通信速率高等众多优点，在个人通信网、无线局域网、第三代移动通信、卫星通信以及军事战术通信等领域得到广泛应用。本文以扩频通信理论为基础，用MATLAB工具箱中的Simulink通信仿真模块和MATLAB函数对直接序列扩频通信系统进行了仿真分析，在给定条件下运行了仿真程序，得到了预期的结果。本文具体介绍了扩频通信的国内外发展背景和发展趋势，阐明了扩频通信在当今社会的重要性，扩频通信是70年代中期迅速发展
2、起来的一种新型的通信系统，它抗干扰能力、抗衰落能力、抗多径的能力是上述其它通信系统无与伦比的。根据扩频通信的特点和原理，对扩频通信进行具体分析如扩频同步，扩频码序列，扩频增益和抗干扰容限等相关问题进行了具体研究，同时介绍了扩频通信在各个领域的应用，说明了其重要性所在。关键词：扩频通信；同步；调制；Simulink仿真；解调48沈阳理工大学学士学位论文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.
