Research Initiation: Coherent Digital Communication on Fading Channels

本项目的目标是综合数字实现的解调器结构，在频率非选择性慢衰落信道中获得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架构--差分相干检测--提高了3分贝。数字实现的体系结构是实现这种一致性性能的最佳方法，因为它们具有许多实践和理论优势。该项目的第一阶段重点是开发用于载波估计和符号解调的通用算法。这项工作正在开发针对衰落信道和具有频率不确定性的载波的优化的相位估计算法。在第二阶段，研究了衰落信道中的符号定时估计和联合相位和符号定时估计。这项工作将有助于产生在衰落信道上具有接近最佳性能的调制解调器，具有许多实用优势。

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.