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] |
|
|
|
本文已被:浏览 6282次 下载 5405次 |
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 |
(国防科技大学 电子技术系 湖南 长沙 410073)
|
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 |
基金项目: |
|
Chipping Effect in DMT and a Method to Reduce the Clipping Noise |
Wang Ying, Tang Chaojing, Wei Jibo |
(Department of Electronic Technology, NUDT, Changsha, 410073)
|
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 |
|
|
|
|
|