基于NS的自适应多速率网络语音通信的性能分析  

Performance analysis of the network communication based on AMR speech coding by using NS

作　　者：贾龙涛[1] 鲍长春[1] 

机构地区：[1]北京工业大学电子信息与控制工程学院,北京100022

出　　处：《通信学报》2006年第6期121-125,133,共6页Journal on Communications

基　　金：北京市科委科技发展项目资助项目(KM200310005024);北京市科技新星计划资助项目(953811300)~~

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(networksimulator)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。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.

关 键 词：语音编码 VOIP系统 分组丢失 

分 类 号：TN912.3[电子电信—通信与信息系统]