一种改进的DMT系统频域均衡器  

An Improved Frequency Domain Equalizer in the DMT System

作　　者：王建中[1] 罗欣武[1] 刘文江[1] 戎蒙恬[1] 

机构地区：[1]上海交通大学芯片与系统设计中心,上海200240

出　　处：《计算机工程与应用》2006年第24期98-101,共4页Computer Engineering and Applications

基　　金：上海市科学技术委员会科研计划项目资助(编号:20050405)

摘　　要：在多载波DMT通信系统中,同时采用时域均衡器和频域均衡器来补偿各个子信道的幅度和相位失真。基于该原理,文章提出了一种优化结构设计的DMT系统频域均衡器,其采用了资源共享的折叠结构,流水线结构,同时CU(Computing Unit)设计也有一些特色,并且根据多载波传输特点,对LMS算法进行修改,与传统均衡器相比,能有效降低系统传输的误码率。该文介绍的频域均衡器针对256个子信道,数据32bit位长的信道均衡。目前,该频域均衡器已在FPGA上验证通过。In the multi-carrier modulation of DMT communication system,both time domain and frequency domain equalizers are used to compensate for the magnitude and phase distortion within each subchannel.For the theory,a structure-optimized design of frequency-domain equalizer in the DMT system is presented,which adopts some special techniques such as resource-sharing folding structure,pipeline structure and have some features in the design of the computing unit.According to the character of multi-carrier communication,some modifications are done to the LMS algorithm,which can effectively decrease the error rate.The frequency domain equalizer is designed for 256 subchannel and 32 bit.The equalizer is implemented in FPGA.

关 键 词：离散多音频调制 频域均衡器 最小均方自适应滤波器 计算单元 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]