High Performance Multiple Description Code Design

高性能多重描述代码设计

• 批准号: 327286-2013
• 负责人: Dumitrescu, Sorina
• 金额: $ 2.55万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=637717
• 关键词: Performance; Multiple; Description; Code; Design

In the multiple description (MD) problem, the goal is to generate a given number, say K, of bitstreams (i.e., descriptions) representing a signal, such that each bitstream can be decoded to an acceptable quality, while more bitstreams refine each other improving the signal reconstruction. MD coding finds applications in transmission of multimedia signals over packet lossy (wired or wireless) networks as it ensures graceful recovery from losses when retransmission is not an option due to stringent delay constraints. Other applications are in diversity communications systems, distributed data storage and multirate multicast. Most practical MD codes address the case of two descriptions, while practical designs for general K are scarce and their performance is some distance from the theoretical optimum. On the other hand, while traditionally MD codes were designed to combat description loss, their ability to combat bit errors has emerged as a side product. This feature is especially useful in wireless communications. However, the design of MD codes to take advantage of this property has received little attention. The purpose of the proposed research is to develop high performance MD codes with increased capability to recover from losses and bit errors. This will be achieved through MD designs of high flexibility in controlling the trade-off between the quality of reconstruction for different subsets of received descriptions and through construction of index assignments with good Hamming distance properties. An important component of this research will be the training of highly qualified personnel. Several graduate students will be engaged in this research and will be trained in multimedia coding and communications, information theory and optimization; training that will prepare them for an engineering or academic career in the information technology sector. The proposed research will advance the knowledge and understanding in the area of MD code design and the techniques and insights developed will be also applicable to other source network coding problems (for instance, in robust distributed source coding).

在多描述(MD)问题中，目标是生成表示信号的给定数量(例如K个)的比特流(即，描述)，使得每个比特流可以被解码到可接受的质量，同时更多的比特流彼此细化以改进信号重构。MD编码在分组丢失(有线或无线)网络上的多媒体信号传输中得到应用，因为当由于严格的延迟约束而不能选择重传时，MD编码确保从丢失中优雅地恢复。其他应用包括分集通信系统、分布式数据存储和多速率组播。大多数实用的MD码解决了两种描述的情况，而针对一般K的实用设计很少，并且它们的性能距离理论上的最优值有一段距离。另一方面，虽然MD码传统上是为对抗描述丢失而设计的，但它们对抗误码的能力已经成为副产品。此功能在无线通信中特别有用。然而，利用这一特性设计MD码却鲜有人关注。这项研究的目的是开发高性能的MD码，提高从丢失和误码中恢复的能力。这将通过在控制接收到的描述的不同子集的重建质量之间的权衡方面具有高度灵活性的MD设计和通过构造具有良好汉明距离特性的索引分配来实现。这项研究的一个重要组成部分将是培训高素质人员。几名研究生将从事这项研究，并将接受多媒体编码和通信、信息理论和优化方面的培训；培训将使他们为在信息技术部门从事工程或学术生涯做好准备。所提出的研究将促进MD码设计领域的知识和理解，所开发的技术和见解也将适用于其他信源网络编码问题(例如，在健壮的分布式信源编码中)。