| 离散多频音调制系统子信道的分级利用方法 |
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| 引用本文： | 张宗橙,宋荣方. 离散多频音调制系统子信道的分级利用方法[J]. 南京邮电大学学报(自然科学版), 1996, 0(3) |
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| 作者姓名： | 张宗橙 宋荣方 |
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| 作者单位： | 南京邮电学院电信工程系 |
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| 摘 要： | 离散多频音调制将信道划分成许多子信道，可分别加以处理和利用。子信道如果加上编码，可获得４～５ｄＢ增益，但使复杂度和时延增大。一般不对称数字用户环路允许在全编码和全不编码之间作选择。本文提出的子信道分级利用方案，针对不同业务对实时性、可靠性的不同要求，仅对部分信道进行编码，以得到较大的灵活性。为此推导了一套比特分配、能量分配的设计公式，物理概念清楚，且有实用价值
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| 关 键 词： | 信道编码，数字用户环路，离散多频音调制，比特分配，子信道分级利用，用户接入 |
A Hierarchical Scheme for Utilizing Subchannels of Discrete Multi tone System |
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| ZhangZongcheng SongRongfang. A Hierarchical Scheme for Utilizing Subchannels of Discrete Multi tone System[J]. JJournal of Nanjing University of Posts and Telecommunications, 1996, 0(3) |
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| Authors: | ZhangZongcheng SongRongfang |
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| Affiliation: | ZhangZongcheng SongRongfang Department of Telecommunation Engineering,Nanjing Institute of Posts and Telecommunications,210003,Nanjing,PRC |
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| Abstract: | Discrete Multi tone(DMT) technique divides a channel into many subchannels that can be processed and utilized respectively. With the aid of encoding,subchannels can obtain gain of 4 to 5 dB,but result in increased complexity and delay. Generally, ADSL(Asymmetric Digital Subscriber Loop)allows all the channels to be encoded or not to be encoded. To obtain larger flexibility,this article presents a hierarchical scheme for utilizing subchannels which encodes subchannels partially for the different requirements of real time property and reliability of different services. A set of design formulas about bit assignment and energy assignment are derived which have clear physical meaning and practical value. |
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| Keywords: | Channel Coding Digital subscriber loops Discrete multi tone modulation Bit assignment Hierarchical scheme for utilizing subchannels Subscriber access |
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