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1、摘要FPGA是現(xiàn)場可編程門陣列(FieldProgrammableGateArray)的簡稱。它具有可編程邏輯器件現(xiàn)場可編程的靈活性,又有門陳列器件功能強(qiáng)、高集成度和高速度的優(yōu)點,因此已在現(xiàn)代通信系統(tǒng)設(shè)計中被越來越廣泛的應(yīng)用。VHDL語言具有很強(qiáng)的電路描述和建模能力,能從多個層次對數(shù)字系統(tǒng)進(jìn)行建模和描述,從而大大簡化了硬件設(shè)計任務(wù),提高了設(shè)計效率和可靠性。論文著重使用VHDL語言對2FSK的調(diào)制與解調(diào)進(jìn)行編程。在系統(tǒng)仿真中,用MAX+PLUSⅡ作為仿真平臺,對2FSK信號進(jìn)行了調(diào)制解調(diào)的仿真。調(diào)
2、制方面用的鍵控法,解調(diào)方面用的相干解調(diào)進(jìn)行解調(diào)。基于FPGA的2FSK調(diào)制與解調(diào)在MAX+PLUSII上實現(xiàn),通過VHDL語言的編程,生成調(diào)制解調(diào)所需要的幾個模塊,以實現(xiàn)整個2FSK的調(diào)制解調(diào)系統(tǒng)。本論文共分四章,第一章主要是介紹了FPGA的原理以及它的應(yīng)用、發(fā)展現(xiàn)狀,另外介紹了VHDL語言的特點;第二章較為詳細(xì)的講述了FSK調(diào)制和解調(diào)的原理,其中包括FSK的多種調(diào)制和解調(diào),及功率譜密度的特點。第三章開始對2FSK調(diào)制解調(diào)系統(tǒng)的各個單元器件進(jìn)行設(shè)計。第四章開頭介紹了MAX+PLUSII這款軟件,
3、接著使用這款軟件實現(xiàn)2FSK調(diào)制解調(diào)算法,其中包括對各個功能模塊的算法編程和時序仿真。本設(shè)計的目的不是為了產(chǎn)生一種優(yōu)于前人算法的算法,而是部分使用前人的算法,在前人算法中加入自己對2FSK調(diào)制解調(diào)算法的理解,從而產(chǎn)生能用于本設(shè)計的非通用算法。關(guān)鍵詞:仿真,2FSK,VHDL,F(xiàn)PGA31AbstractFPGAistheabbreviationforFieldProgrammableGateArray.Ithastheflexibilityoffieldprogrammabletotheprog
4、rammablelogicdevices,alsohavestrongfunction,highlevelofintegrationandtheadvantagesofhighspeed,theseadvantagesaresamewithGateArraydevices.Therefore,ithasbeenmoreandmorewidelyusedinthemoderncommunicationsystemdesign.VHDLlanguagehasstrongabilityofcircui
5、tdescribedandmodeling,itcanmodelanddescribedigitalsysteminmultiplelevels,simplifiedthehardwaredesigntask,toimprovethedesignefficiencyandreliability.ThispapermainlyusethelanguageofVHDLonprogrammingmodulationanddemodulationof2FSK.Inthesystemsimulation,
6、usingMAX+PLUSⅡ,tosimulatemodulationanddemodulationof2FSK.Modulationusekeyingmethod,demodulationusecoherentdemodulationmethod.Basedon2FSKmodulationanddemodulationofFPGArealizingonMAX+PLUSⅡ,throughtheVHDLlanguageprogramming,producingsomeblocksofmodulat
7、ionanddemodulation,realizingthewhole2FSKmodulationanddemodulationsystem.Thisthesisinchapter4,ThefirstchapterismainlyintroduceshebasicprincipleofFPGAanditsapplication,developmentsituation,alsointroducesthecharacteristicsofthelanguageofVHDL;thesecondch
8、aptertellsthedetailsofFSKmodulationanddemodulationbasicprinciple,includingvariousmodulationanddemodulationmethodofFSK,andpowerspectraldensitycharacteristics.Thethirdchapterbegantodesigneachunitdevicesofthe2FSKmodulationanddemodulation.Thefourthchapte