消除DMT调制中循环前缀长度不足引起的失真  

Reduction of the distortion caused by insufficient cyclic prefix length for DMT modulation system

作　　者：石文孝[1] 

机构地区：[1]长春邮电学院通信工程系,吉林长春130012

出　　处：《长春邮电学院学报》1999年第4期12-16,共5页Journal of Changchun Post and Telecommunication Institute

基　　金：信息产业部重点科技发展计划项目! (97065)

摘　　要：针对离散多频音调制 (DMT) 应用在非对称数字用户线 (ADSL) 和甚高速数字用户线 (VDSL) 系统时, 若信道的脉冲响应比预定的循环前缀长度长, 信道的输出端会出现载波间干扰形式失真的问题, 提出了一种通过在发信机中引入预编码器消除这种失真的方法。尽管预编码器的引入使发送功率有所增加, 但失真明显减小,When Discrete Multi Tone (DMT) modulation technique is used in Asymmetric Digital Subscriber Lines (ADSL) and Very High speed DSL (VDSL) systems, the distortion will appear at the channel output in the form of interference between the carriers if impulse response of the channel is longer than designed cyclic prefix length. In order to solve this problem, a method to remove this distortion by introducing a precoder at transmitter is proposed. Although there will be a power increase after the use of the precoder, the distortion is significantly reduced and an improvement of performance is achieved.

关 键 词：信道编码 离散多频音调制 循环前缀 DMT 

分 类 号：TN911.2[电子电信—通信与信息系统]