Theory and Design of Rateless Codes for Wireless Communication

这项研究旨在解决无线通信应用中无码率码理论和设计中的几个关键问题。与传统的编码设计不同，无码率编码不需要规定的传输数据速率。相反，编码的消息被发送，直到接收器发出它已连续解码该消息的信号。该技术允许数据传输适应所实现的信道质量，这在无线网络应用中通常是未知的。本研究中用于实现无速率传输的主要方法包括使用具有连续抵消接收器的多层低速率子码。研究了加性白高斯噪声(AWGN)信道中的无码率设计问题，利用重复码和抖动编码技术，研究了加性白高斯噪声(AWGN)信道中的无码率设计。然后将该方法推广到研究容量未知的二进制对称信道、多输入多输出(MIMO)信道以及无速率环境下的网络应用，包括多接入信道、中继信道以及各种协作传输结构。这项研究的最终目标是解决增量信息传输的根本问题，并为开发新一代应用所需的健壮和灵活的无线基础设施奠定理论基础。

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.