| 回波抵消器中定时抖动的影响 |
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| 引用本文： | 郭世满,包文菖,曹士坷.回波抵消器中定时抖动的影响[J].南京邮电大学学报(自然科学版),1991(1). |
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| 作者姓名： | 郭世满 包文菖 曹士坷 |
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| 作者单位： | 南京邮电学院电信工程系，南京邮电学院电信工程系，南京邮电学院电信工程系 |
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| 摘 要： | 本文针对ISDN数字用户环路二线全双工的回波抵消传输方式,首先探讨了LMS、VLMS1自适应算法,并在此基础上提出改进的VLMS2算法。然后分析了定时抖动对回波抵消算法的影响,并进行了计算机模拟。结果表明,VLMS2算法在收敛速度及抗抖动方面均有较好的性能,最后提出了对减少定时抖动影响可行的定时提取方案。
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| 关 键 词： | 数字通信 双工传输 回波抑制器 定时电路 抖动 |
Effect of Timing Jitter in Echo Canceller |
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| Guo Shiman Bao Wenchang Cao Shike.Effect of Timing Jitter in Echo Canceller[J].Journal of Nanjing University of Posts and Telecommunications,1991(1). |
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| Authors: | Guo Shiman Bao Wenchang Cao Shike |
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| Institution: | Department of Telecommunication Engineering |
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| Abstract: | This paper discusses firstly adaptive algorithms of LMS and VLMS1, being used widely in treating the problem of echo cancellation for full-duplex transmission in ISDN digital subscriber's loop. On the basis of above two algorithms, we introduce our new modified one,named VLMS2. Then,the effect of timing jitter on the echo-cancelling algorithms is discussed, and computer simulation is performed.The result shows that the VLMS2 does better than the LMS and VLMS1 in the convergence speed and the resistability to the jitter. Finally, a practicable plan for timing extracton is put forward to reduce the bad influence of timing jitter. |
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| Keywords: | Digital communication Duplex transmission Echo suppressor Timing circuit Jitter |
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