| 引用本文: | 王瑛,唐朝京,魏急波.截幅效应对DMT调制的影响及一种减小截幅噪声的方法.[J].国防科技大学学报,1998,20(5):92-96.[点击复制] |
| Wang Ying,Tang Chaojing,Wei Jibo.Chipping Effect in DMT and a Method to Reduce the Clipping Noise[J].Journal of National University of Defense Technology,1998,20(5):92-96[点击复制] |
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| 截幅效应对DMT调制的影响及一种减小截幅噪声的方法 |
| 王瑛, 唐朝京, 魏急波 |
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(国防科技大学 电子技术系 湖南 长沙 410073)
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| 摘要: |
| DMT(Discrete Multitone) 调制是一种在ADSL(Asymmetrical Digital Subscribe Line) 中被广泛采用调制技术。本文分析了在DMT中对信号进行截幅所产生的影响, 计算了D/A变换产生的量化噪声和截幅噪声, 并与未截幅时相比较, 在不降低SNR的情况下, 降低了D/A变换器的精度的要求, 并求出最佳截幅因子。本文分析了一种减小截幅噪声的方法, 并说明在非最佳截幅时, 通过这种方法可获得与最佳截幅同样的结果。 |
| 关键词: DMT调制, 截幅效应与截幅因子, 量化噪声 |
| DOI： |
| 投稿日期：1997-03-10 |
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| Chipping Effect in DMT and a Method to Reduce the Clipping Noise |
| Wang Ying, Tang Chaojing, Wei Jibo |
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(Department of Electronic Technology, NUDT, Changsha, 410073)
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| Abstract: |
| Discrete Multitone Modulatin (DMT) has been widely chosen for Asymmetric Digital Subscriber Lines (ADSL). This Paper analyzes the effect of chipping in DMT-based transceivers and compute the chipping noise and the quantization noise produced by the D/A convertor. Compared with the no-chipping, the number of bits for D/A converter is reduced without the loss of SNR. This paper analyses a method to reduce the chipping noise and show that by this method we can get the same result under the not-optimum chipping as that under the optimum chipping. |
| Keywords: DMT, chipping effect and chipping factor, quantazation noise |
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