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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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基于复小波变换的ocwdm多载波调制系统用于dvb-t
, PP. 38-42
Keywords: 二元树复小波变换,小波复用,多载波调制,数字电视系统
Abstract:
用二元树复小波变换取代ofdm中的傅立叶变换,应用于dvb系统.在dvb-t中,将orthogonalcomplexwaveletdivisionmultiplex(ocwdm)多载波调制系统在高斯信道、平坦衰落信道、频率选择性信道中进行仿真.同ofdm相比较,ocwdm在高斯信道和平坦衰落信道下误码率有着明显的降低;在频率选择性信道下,ocwdm的误码率也低于ofdm.ocwdm有着很好的抗噪声和抗衰落、抗多径特性.dtcwt的小波基具有正交性,不需要循环前缀来消除码间干扰和子载波间干扰,简化了ocwdm调制过程.dtcwt可以直接通过数字滤波器实现,运算复杂度低,硬件实现简单.ocwdm在dvb系统中有着很好的应用前景.
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