离散多频音调制系统中符号间干扰的消除  

Elimination of Intersymbol Interference for Discrete Multitone

作　　者：曹雪虹[1] 穆明生[1] 

机构地区：[1]南京邮电学院通信工程系

出　　处：《南京邮电学院学报》1997年第4期45-48,共4页Journal of Nanjing University of Posts and Telecommunications(Natural Science)

摘　　要：介绍了用于高速率数字用户线中性能较优的数字调制技术———离散多频音调制，分析了调制原理及其实现方法，提出了加循环前缀与时域均衡器相结合的方法解决符号间干扰问题。实验表明，该方法可有效地消除符号间干扰，发送效率不会有大的下降，时域均衡器抽头数也较少。An efficient digital modulation technology used in highspeed digital subscriber line, discrete multitone modulation is introduced. A method to eliminate the insersymbol interference (ISI) is presented. The experimental results show that the length of the impulse response of the channel can be shortened by passing the received signal through a timedomain equalizer (TEQ) before demodulation, and the ISI can be eliminated by appending a cyclic prefix same length as the shortened impulse response to each block of samples of the transmit signal. The transmit efficiency is decreased slightly, and the number of the tap of the TEQ is also fewer.

关 键 词：用户线 离散多频音调制 符号间干扰 数字调制 

分 类 号：TN761[电子电信—电路与系统]