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 |