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1、畢業(yè)設(shè)計(jì)說明書設(shè)計(jì)（論文）題目：基于小波的OFDM系統(tǒng)摘要隨著無線通信技術(shù)的不斷發(fā)展和成熟，正交頻分復(fù)用OFDM(OrthogonalFrequencyDivisionMultiplexing)技術(shù)受到了人們的廣泛關(guān)注。在OFDM系統(tǒng)中，高速的數(shù)據(jù)流通過串并轉(zhuǎn)換，使每個(gè)子載波上的數(shù)據(jù)符號(hào)持續(xù)時(shí)間相對增加，有效地減少了無線信道時(shí)間彌散帶來的符號(hào)間干擾ISI(Inter-symbolInterference)，為支持未來高速率的無線數(shù)據(jù)業(yè)務(wù)提供了可能。但是傳統(tǒng)的OFDM系統(tǒng)對頻偏和相位噪聲比較敏感，自適應(yīng)調(diào)制技術(shù)增加了系統(tǒng)的復(fù)雜度，而基于小波理論的OFDM系統(tǒng)不
2、但降低了系統(tǒng)的復(fù)雜度，而且提高了抗干擾能力。本文利用小波的高頻譜效率特性，提出了基于離散小波變換和多分辨分析理論的正交頻分復(fù)用技術(shù)，建立了計(jì)算機(jī)仿真系統(tǒng)，結(jié)果表明IDWT-DWT的OFDM系統(tǒng)遠(yuǎn)遠(yuǎn)優(yōu)于IFFT-FFT的OFDM系統(tǒng)。本文還研究了IDWT-DWT的OFDM系統(tǒng)的頻譜特性，抗干擾特性，系統(tǒng)峰均比特性以及算法復(fù)雜度等，通過仿真我們證明了基于IDWT-DWT的OFDM系統(tǒng)性能明顯優(yōu)于IFFT-FFT的OFDM系統(tǒng)。本文的最后對設(shè)計(jì)進(jìn)行了總結(jié)，并對以后IDWT-DWT的OFDM系統(tǒng)的研究進(jìn)行了深入的分析和探討。關(guān)鍵詞：離散小波變換；快速傅里葉變換；正交
3、頻分復(fù)用；Mallat算法；ABSTRACTWiththedevelopmentandmatureofthewirelesscommunicationtechnology,TheOrthogonalFrequencyDivisionMultiplexingtechnologyhasreceivedpeople'swidespreadattention.IntheOFDMsystem,high-speeddatastreamthroughbunchandmergetransform,makesdatasymboldurationincreaserelative
4、lyineachsub-carrierwave,reducesinter-symbolinterferencefromwirelesschanneltimedispersioneffectively,consequentlyitispossibilityforsustainingfuturehighspeedwirelessdataoperation.ButtraditionOFDMsystemtowardtofrequencyexcursionandphaseyawpsensitivity,auto-adaptedmodulatingtechnologyi
5、ncreasedcomplexityofsystem,andOFDMsystembasedonwavelettheoryreducedthecomplexityofsystemandenhancetheabilityofanti-jamming.Thisarticleusesthewaveletthehighfrequencyspectrumefficiencycharacteristic,proposedbasedontheseparatewavelettransformationandthemulti-resolutionanalysistheoryOr
6、thogonalFrequencyDivisionMultiplexingtechnology,hasestablishedthecomputersimulationsystem,andfinallyindicatedtheIDWT-DWTforOFDMsystemsurpassestheIFFT-FFTforOFDMsystembyfar.ThisarticlehasalsostudiedtheIDWT-DWTforOFDMsystemfrequencyspectrumcharacteristic,theantigamblingcharacteristic
7、,thesystempeakcomparedtothecharacteristicaswellasthealgorithmorderofcomplexityandsoon,wehadproventhroughthesimulationsurpassestheIFFT-FFTforOFDMsystemobviouslybasedontheIDWT-DWTforOFDMsystemperformance.Thisarticlefinallytodesignedhascarriedonthesummary,andhascarriedonthethoroughana
8、lysisandthediscussiontothe
