喷泉码在多播传输机制中的应用  

The Application of Digital Fountain Code in Multicast Transmission Mechanism

作　　者：刘德康[1] 尹鹏[1] 张序琦[1] 卢继华[2] 

机构地区：[1]北京理工大学信息与电子学院 [2]北京理工大学通信技术研究所

出　　处：《现代电信科技》2012年第8期59-62,66,共5页Modern Science & Technology of Telecommunications

摘　　要：首先研究了数字喷泉码优异的前向纠错特性;其次,在IEEE802.16e标准基础上引入了多播广播服务(MBS)小区的概念,给出了MBS小区规划算法;接着,对多种度分布的数字喷泉码应用在多播传输机制中进行仿真和分析,最后得出结论。仿真结果表明,在每包2 000比特、开销20%时,采用Raptor度分布的数字喷泉编码能够保证误码率在0.1%以下,可实现高效率高可靠性的数据传输。多播传输机制中使用数字喷泉码,能够提高接收效率,适应时变信道与异质用户,并实现异步和断续接收。The excellent forward error correction features of digital fountain code is studied first. Sec-ondly, the concept of the MBS service cell in IEEE802.16e standard, and the MBS district plan-ning algorithm are introduced. The performance of various digital fountain codes of different degree distribution used in multicast transmission mecha-nism are simulated and analyzed. The simulation results show that at the overhead of 20% （2000 bits per packet）, the degree distribution of Raptor Fountain codes can achieve the symbol error rate below 0.1%, achieve high efficient and high reliable data transmission.

关 键 词：数字喷泉码 多播传输机制 IEEE802.16E 误码率 

分 类 号：TN911[电子电信—通信与信息系统]