Research Initiation: Coherent Digital Communication on Fading Channels

该项目的目标是合成数字实现的解调器架构，在频率非选择性慢衰落信道中实现接近理想的相干数字通信性能。相干数字通信性能比最常用的衰落信道解调体系结构差分相干检测提高了3db。数字实现架构是实现这种一致性能的最佳方法，因为它们具有许多实践和理论优势。该项目的第一阶段侧重于开发用于载波估计和符号解调的通用算法。本工作是针对衰落信道和频率不确定载波优化相位估计算法。在第二阶段，研究了衰落信道上的符号时序估计和联合相位与符号时序估计。这项工作将有助于生产出在衰落信道上性能接近最佳的调制解调器，并具有许多实际优势。

The objectives of this project are the synthesis of digitally implemented demodulator architectures which achieve near ideal coherent digital communication performance in the frequency nonselective slow fading channel. Coherent digital communication performance provides a 3 dB improvement over the most commonly utilized fading channel demodulation architecture, differentially coherent detection. Digitally implemented architectures are the best method of achieving this coherent performance since they possess many practical and theoretical advantages. The first stage of this project focuses on the development of generalized algorithms for carrier estimation and symbol demodulation. This work is developing phase estimation algorithms optimized for the fading channel and a carrier with frequency uncertainty. In the second phase symbol timing estimation and joint phase and symbol timing estimation on the fading channel is being investigated. The work will help produce modems with near optimal performance on the fading channel with many practical advantages.