Rateless coding for multicasting multimedia over wireless channels

近年来，先进通信设备的使用已经变得普遍。无线电信行业在加拿大经济中发挥着关键作用，提供25，000个就业岗位，收入超过95亿加元，基础设施投资41亿加元。近年来，无线用户数量以超过17%的复合年增长率增长，达到1490万，而收入以14%的速度增长，达到95亿美元。不仅是移动的电话的数量超过了有线电话的数量，这些移动的设备的功能也成倍增加，包括传输静止图像、数据、软件应用程序和视频。这在加拿大和全世界都带来了许多积极的社会发展，包括增加安全性、社会互动和消除低成本、可访问信息分发的其他障碍。为了继续上述增长，无线通信网络需要进行重大的重新设计。虽然电信网络的基本原则传统上涉及有线系统的分层，过多的移动的/手持设备需要在检查、能量和经济效率方面的突破，因为这些分层协议对于在无线信道上操作的小的、低功率的设备可能是非常低效的。拟议的项目是关注的设计ofcoding方法，使有效的信息分配到大量的未来移动的设备和网络拓扑结构，包括那些涉及中继和合作。其目的是支持数据以及其他媒体内容。相对于数据，音频和视频形式的媒体可以容忍的丢包率远远超过传输延迟。本项目提出研究新的传输协议，使先进的无比率喷泉码，以避免昂贵的开销与当前的重传协议，减少带宽，增加延迟和交通堵塞。

In recent years, the use of advanced communications devices has become pervasive. The wirelesstelecommunications sector plays a critical role in the Canadian economy, accounting for 25,000 jobs, over $9.5billion in revenue, and a $4.1 billion investment in infrastructure. In recent years, the number of wirelesssubscribers has increased at a compound annual growth rate exceeding 17% to reach 14.9 million whilerevenue has grown at a rate of 14% to reach $9.5 billion. Not only is the number of mobile phones surpassingthe number of wired phones, the functionalities of these mobile devices have multiplied to include thetransmission of still images, data, software applications and video. This has led to many positive societaldevelopments both in Canada and worldwide, including increased security, social interaction and the removalof other barriers from low-cost, accessible information distribution.For the above growth to continue, wireless communications networks need to undergo a significant redesign.While the underlying principles of telecommunications networking have traditionally involved layering asdeveloped for wire line systems, the plethora of mobile/handheld devices necessitates breakthroughs inspectral, energy and economic efficiency since these layered protocols can be extremely inefficient for small,low-power devices operating over wireless channels. The proposed project is concerned with the design ofcoding methods to enable efficient distribution of information to large numbers of futuristic mobile devices andnetwork topologies, including those involving relaying and cooperation. The aim is to support both data as wellas other media content. Relative to data, media in the form of audio and video can tolerate packet loss muchmore than transmission delay. This project proposes to investigate new transmission protocols enabled byadvances in rateless fountain codes to avoid the costly overhead associated with current retransmissionprotocols that reduce bandwidth and add to delay and traffic congestion.