资源描述:
《2fsk数字调制通信系统的设计学士学位论文.doc》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、Xxxxxxx毕业设计(论文)2FSK数字调制通信系统的设计摘要调制解调器是通信系统中的关键设备,其性能的好坏直接关系到整个系统的性能。本次设计的FSK调制系统具有抗干扰、抗噪声、抗衰减性能较强、技术复杂程度比较低、成本低等诸多优点,因而广泛应用与实际电路中。在中低速数据传输通信系统中得到了较为广泛的应用。此外,许多集成芯片里也用到了FSK调制技术。本次设计的FSK电路可广泛用于计算机网络、办公自动化、远程自控系统及移频通信中。现代通信系统要求通信距离远、通信容量大、传输质量好。作为其关键技术之一的调制解调技术一直是人们研究的一
2、个重要方向。从最早的模拟调幅调频技术的日臻完善,到现在数字调制技术的广泛运用,使得信息的传输更为有效和可靠.。采用FSK调制方式的主要优点是:①无需载波恢复,大大降低了系统复杂度。②对幅度的非线性抗干扰能力强。因为FSK信号为恒包络信号,其信息完全包含在信号的过零点上,所以比起调幅信号,其对幅度非线性抗干扰能力要强。③调制解调易用软硬件实现,简单易懂。关键字:VHDL语言;2FSK调制;2FSK解调;MFSK调制第41页共42页Xxxxxxx毕业设计(论文)2FSKDigitalmodemsCommunicationSystem
3、DesignSummary Modemisthekeyequipmentofcommunicationssystem;itsperformancewillhaveadirecteffectontheperformanceofthewholesystem.ThedesignoftheFSKmodulationsystemhasadvantagessuchasanti-jamming,anti-noise,high-attenuationperformance,relativelylowtechnicalcomplexityandl
4、owcost,thuswidelyapplyinginactualcircuit.Ithasbeenmorewidelyusedinthelow-speeddatatransmissioncommunicationsystem.Inaddition,manyintegratedchipalsousedtheFSKmodulationtechnique.ThedesignoftheFSKcircuitcanbewidelyusedincomputernetworking,officeautomation,remote-contro
5、lledsystemandthefrequencyshiftincommunication.Moderncommunicationsystemsrequirefardistancecommunications,telecommunicationscapacity,andtransmissionquality.Asoneofthekeytechnologiesofitsmodemtechnologyhasalwaysbeenanimportantresearchingdirectionofpeople.Fromtheearlies
6、tAMFManalogtechnologyimproving,andnowdigitalmodulationoftheextensiveuseoftechnology,makingthetransmissionofinformationmoreeffectiveandreliable.ThemainadvantagesofusingFSKmodulationare:①withoutcarrierrecovery,significantlyreducingsystemcomplexity.②stronganti-interfere
7、ncecapabilityontherateofnon-linear.BecausetheFSKsignalsareconstantenvelopesignals,theinformationaretotallyincludedintheover0.1signalpoint,ratherthanAMsignals,havingstrongeranti-interferencecapabilityontherateofnon-linear.③modemiseasytoachievebyusingsoftwareandeasy-to
8、-understand.Keyword:VHDLLanguage;The2FSKmake;The2FSKsolutionadjust;TheMFSKmake第41页共42页Xxxxxxx毕业设计(论文)绪论如今社会通信技术的发展速度可谓日新月异,计算机的出现在现