| 基于NS的自适应多速率网络语音通信的性能分析 |
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| 引用本文： | 贾龙涛,鲍长春. 基于NS的自适应多速率网络语音通信的性能分析[J]. 通信学报, 2006, 27(6): 121-125 |
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| 作者姓名： | 贾龙涛 鲍长春 |
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| 作者单位： | 北京工业大学,电子信息与控制工程学院,北京,100022 |
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| 基金项目： | 北京市科委科技发展项目;北京市科技新星计划项目 |
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| 摘 要： | 目前,几乎所有的语音电话系统（VoIP）都采用固定速率传输,这使得网络丢包,特别是连续丢包无法避免,因此导致了严重的语音质量下降.针对这一问题,给出了一种新的抗分组丢失的网络语音通信系统,并用网络仿真软件NS（network simulator）对该系统进行了性能分析,仿真实验证明,所提出的网络语音通信系统在网络丢包、平均延迟和主观听觉方面明显优于传统的IP语音电话系统.
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| 关 键 词： | 语音编码 VoIP系统 分组丢失 |
| 文章编号： | 1000-436X（2006）06-0121-05 |
| 收稿时间： | 2004-04-16 |
| 修稿时间： | 2004-04-162006-05-12 |
Performance analysis of the network communication based on AMR speech coding by using NS |
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| JIA Long-tao,BAO Chang-chun. Performance analysis of the network communication based on AMR speech coding by using NS[J]. Journal on Communications, 2006, 27(6): 121-125 |
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| Authors: | JIA Long-tao BAO Chang-chun |
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| Affiliation: | School of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100022, China |
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| Abstract: | Most of the VolP systems were based on the speech codec with a fixed rate, which maked packet-loss serious, especially for continuous packet-loss. The degradation for the speech quality would be caused by the kind of packet-loss. A network communication system for preventing packet-loss was given. The performance of the system was analyzed by using advanced NS. The simulation results show that the proposed system outperforms traditional IP system over the packet-loss, average delay and subjective listening quality. |
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| Keywords: | speech coding VolP system packet-loss |
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