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ID:55570208
大小:911.50 KB
页数:48页
时间:2020-05-18
《基于小波OFDM系统设计终稿.doc》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、毕业设计说明书设计(论文)题目:基于小波的OFDM系统摘要随着无线通信技术的不断发展和成熟,正交频分复用OFDM(OrthogonalFrequencyDivisionMultiplexing)技术受到了人们的广泛关注。在OFDM系统中,高速的数据流通过串并转换,使每个子载波上的数据符号持续时间相对增加,有效地减少了无线信道时间弥散带来的符号间干扰ISI(Inter-symbolInterference),为支持未来高速率的无线数据业务提供了可能。但是传统的OFDM系统对频偏和相位噪声比较敏感,自适应调制技术增加了系统的复杂度,而基于小波理论的
2、OFDM系统不但降低了系统的复杂度,而且提高了抗干扰能力。本文利用小波的高频谱效率特性,提出了基于离散小波变换和多分辨分析理论的正交频分复用技术,建立了计算机仿真系统,结果表明IDWT-DWT的OFDM系统远远优于IFFT-FFT的OFDM系统。本文还研究了IDWT-DWT的OFDM系统的频谱特性,抗干扰特性,系统峰均比特性以及算法复杂度等,通过仿真我们证明了基于IDWT-DWT的OFDM系统性能明显优于IFFT-FFT的OFDM系统。本文的最后对设计进行了总结,并对以后IDWT-DWT的OFDM系统的研究进行了深入的分析和探讨。关键词:离散小
3、波变换;快速傅里叶变换;正交频分复用;Mallat算法;ABSTRACTWiththedevelopmentandmatureofthewirelesscommunicationtechnology,TheOrthogonalFrequencyDivisionMultiplexingtechnologyhasreceivedpeople'swidespreadattention.IntheOFDMsystem,high-speeddatastreamthroughbunchandmergetransform,makesdatasymboldur
4、ationincreaserelativelyineachsub-carrierwave,reducesinter-symbolinterferencefromwirelesschanneltimedispersioneffectively,consequentlyitispossibilityforsustainingfuturehighspeedwirelessdataoperation.ButtraditionOFDMsystemtowardtofrequencyexcursionandphaseyawpsensitivity,auto-
5、adaptedmodulatingtechnologyincreasedcomplexityofsystem,andOFDMsystembasedonwavelettheoryreducedthecomplexityofsystemandenhancetheabilityofanti-jamming.Thisarticleusesthewaveletthehighfrequencyspectrumefficiencycharacteristic,proposedbasedontheseparatewavelettransformationand
6、themulti-resolutionanalysistheoryOrthogonalFrequencyDivisionMultiplexingtechnology,hasestablishedthecomputersimulationsystem,andfinallyindicatedtheIDWT-DWTforOFDMsystemsurpassestheIFFT-FFTforOFDMsystembyfar.ThisarticlehasalsostudiedtheIDWT-DWTforOFDMsystemfrequencyspectrumch
7、aracteristic,theantigamblingcharacteristic,thesystempeakcomparedtothecharacteristicaswellasthealgorithmorderofcomplexityandsoon,wehadproventhroughthesimulationsurpassestheIFFT-FFTforOFDMsystemobviouslybasedontheIDWT-DWTforOFDMsystemperformance.Thisarticlefinallytodesignedhas
8、carriedonthesummary,andhascarriedonthethoroughanalysisandthediscussiontothe
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