摘要
在DMT-ADSL(Discrete MultiTone-Asymm etric Digital Subscriber Line)系统中,传统时域均衡器算法的改进对系统性能改善不大,为此,通过改进传统时域均衡器的结构,对一种新的双路结构TEQ(Time-domain E-qualizer)进行讨论。这种新的结构在传统单路TEQ的基础上加入另一个TEQ,根据预设规则从两个路径中选择一个作为输出。该方法有利于最优化每个子信道上的比特数量。仿真比较了各种不同算法情况下双路时域均衡器的性能。结果表明,比特速率最高为MMSE(Minimum Mean-Square Error)+MBR(Maximum Bit Rate)组合的双路TEQ,达到37.76%;最低为MSSNR(Maximum Shortening Signal-to-Noise Ration)+Min-ISI(Mini-mum Intersymbol Interference)组合的双路TEQ,达到0.91%。
In the system of DMT-ADSL ( Discrete MuhiTone-Asymmetric Digital Subscriber Line), considering the improvement of improving on the traditional TEQ (Time-domain Equalizer) arithmetic is not obvious, a new Dual-Path TEQ structure by improving the traditional TEQ structure is studied. This structure adds a second TEQ to the originally single-path TEQ, and we choose output from one of the two paths according to a preset rule. This method works well in optimizing the number of bits supported on each subchannel. We compared the performances in different dual-path TEQ used different arithmetic, the results indicate: The MMSE + MBR DualPath TEQ achieved highest Achievable Bit Rate (ABR) TEO achieved lowest ABR. reached 0. 91%. reached 37.76% ; The MSSNR + Min-ISI Dual-Path
出处
《吉林大学学报(信息科学版)》
CAS
2007年第2期156-159,共4页
Journal of Jilin University(Information Science Edition)
关键词
时域均衡器
离散多音频调制
非对称数字用户线路
time-domain equalizer (TEQ)
discrete muhitone (DMT)
asymmetric digital subscriber line(ADSL)