标题: 前向错误更正系统在多媒体通讯的应用
An FEC system for multimedia communication
作者: 阮莉茹
Ruan, Li-Ru
吴毅成
I-Chen Wu
资讯科学与工程研究所
关键字: 前向错误更正;广播;FEC;multicast;broadcast
公开日期: 1996
摘要: 可靠的传输可以由自动重传要求或前向错误更正来达成,对即时性的多
媒体应用而言,自动重传要求并不适合,尤其是一对多的应用,如广播系
统,自动重传要求会使伺服器成为系统瓶颈,疲于应付个个客户不同的重
传要求。前向错误更正的好处是,不论是一对一或是一对多的传输,客户
都可以自行在当地回复错误。本论文将简介前向错误更正理论,并发展了
一套适合多媒体传输的前向错误更正系统,同时我们也发展了一套完整的
系统界面,将系统模组化,让多媒体应用程式可以容易的和本系统结合,
由单机应用转成网路多机互动的应用,而不需要知道网路传输的细节。本
论文最后成功的将MPEG的layer2压缩和本系统结合,发展了一套即时的广
播系统,验证了系统的可行性。
Reliable transmission can be achieved by both ARQ (Automatic
Retransmission Request) and FEC (Forward Error Correction). For
most real-time multimedia applications, especially for one-to-
many applications like broadcasting systems, if ARQ is used, the
server will be busy retransmitting lost packets because each
client may have different patterns for lost packets. The
advantageof FEC is that clients can recover lost packets without
asking the server to retransmit. In this paper, we will
introduce the scheme of forward error correction, and we will
develop a FEC system for multimedia transmission. We also define
a general interface such that application programs can be
integrated with our system without knowing the details of our
system by using the interface. At final, we will combine our
system with the MPEG layer2 encoders/decoders to form a
broadcasting system.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT850392043
http://hdl.handle.net/11536/61794
显示于类别:Thesis