Theory and Design of Rateless Codes for Wireless Communication

无线通信无速率码的理论与设计

• 批准号: 0515122
• 负责人: Gregory Wornell
• 金额: $ 30.95万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0515122&HistoricalAwards=false
• 关键词: Theory; Design; Rateless; Codes; Wireless

This research is aimed at addressing several key issues in the theory and designs of rateless codes for wireless communication applications. Unlike conventional coding designs, a rateless code does not require a prescribed transmission data rate. Instead, the encoded messages are transmitted until the receiver signals that it has successively decoded the message. This technique allows the data transmission to adapt to the realized channel quality, which is often not known in wireless network applications. The main approach used in this research to achieve rateless transmissions involves the use of multiple layers of low rate sub-codeswith successive cancellation receivers. Related issues in the fundamental performance limits and specific code designs are studied.Specifically, the investigators examine the rateless code designs in additive white Gaussian noise (AWGN) channels with unknown signal-to-noise ratios, by using repetition codes and dithering encoding techniques. The approach is then generalized to study binary symmetric channels with unknown capacities, multiple-input multiple-output (MIMO) channels, as well as network applications including multiple access channels, relay channels, as well as a variety of cooperative transmission architectures in the rateless context. The ultimate goal of this research is to addressthe fundamental issue of incremental information transmissions, and to develop a theoretical foundation for the development of robust and flexible wireless infrastructure needed for a new generation of applications.

本研究旨在解决无线通信应用中无比率码的理论和设计中的几个关键问题。与传统的编码设计不同，无速率码不需要规定的传输数据速率。相反，编码的消息被发送，直到接收机发信号通知它已经成功地解码了消息。该技术允许数据传输适应于实现的信道质量，这在无线网络应用中通常是未知的。在本研究中，实现无速率传输的主要方法是使用多层低速率子码和连续抵消接收机。 研究了基本性能限制和具体码设计中的相关问题，特别是在信噪比未知的加性白色高斯噪声（AWGN）信道中，利用重复码和抖动编码技术研究了无比率码的设计。然后，该方法被推广到研究未知容量的二进制对称信道，多输入多输出（MIMO）信道，以及网络应用，包括多址接入信道，中继信道，以及各种合作传输架构在无速率上下文中。本研究的最终目标是解决增量信息传输的基本问题，并为新一代应用所需的强大而灵活的无线基础设施的发展奠定理论基础。