不同压缩算法性能的研究  

Study on Performances of Different Compression Algorithms

作　　者：李明[1] 杨雷[1] 黎山峰[1] 

机构地区：[1]东莞理工学院电子工程系

出　　处：《通信技术》2009年第4期175-177,共3页Communications Technology

基　　金：东莞市科技计划项目(东科[2007]1号)

摘　　要：移动通信网络中,建立一次多媒体会话通常需要数十秒钟的时间。通过对信令消息的压缩可以有效地减少所需时延,改善服务质量。文章先后使用了LZ77、LZW和Deflate压缩算法对因特网协议多媒体子系统中的会话发起协议信令消息的压缩进行了研究。仿真结果显示:Deflate算法的压缩性能最好,不使用辞典时压缩率可以达到30%,使用辞典时压缩率可以达到50%以上;接着是LZW算法,而LZ77算法的压缩性能最差。The establishment of a multimedia session in mobile communication network generally takes several ten seconds. Such long delay is not favorable for Quality of Service. The improvement of transmitting delay is always investigated. The reduction of signaling message size is evidently a good solution. In this paper, the compression algorithms such as LZ77, LZW and Deflate are used to study the SIP compression in IP multimedia system. Simulation result shows that： Deflate is the best, its compression rate is even up to 30% without using dictionary and up to 50% with using dictionary; LZW is better, and LZ77 the worst.

关 键 词：多媒体会话 信令压缩 会话发起协议 压缩性能 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]