Design and Analysis of CDMA Receivers for Fading Multipath Channels

本课题是对衰落多径信道下的码分多址通信的研究。这项研究的总体目标是设计和分析可实际实现的自适应接收机，以实现可靠、带宽高效和抗远近通信。通过接收机设计和分析的新结果，证明了该方案的可行性，实现了非选择性衰落、带记忆的同步码分多址信道的这些目标。在码分多址通信中，接收机的复杂度是至关重要的，为了解决这个问题，人们提出了组检测的新思想。结果表明，针对有记忆衰落信道设计的自适应接收机的性能远远优于传统的扩频接收机。这项研究将考虑在一般衰落的多径信道上实现带宽高效的CDMA通信的实际可达到的极限的方案的开发。将应用检测、估计、极小极大稳健性、最优滤波、动态规划、数字滤波、大偏差和最优序列检测问题的错误概率界限技术等理论中的分析工具，并寻求新的分析工具。

This project is a study of Code-Division Multiple-Access communication over fading multipath channels. The overall objective of the research is to design and analyze practically implementable adaptive receivers for reliable, bandwidth-efficient, and near-far resistant communications. The feasibility of the project is established via new results in receiver design and analysis that achieve these objectives for the nonselective fading, synchronous CDMA channel with memory. Receiver complexity is of fundamental importance in CDMA communication and the new idea of group detection is proposed to address that issue. It is shown that the adaptive receiver designed for the fading channel with memory far outperforms the conventional spread spectrum receiver. This research will consider the development of schemes that will realize the practically achievable limits of bandwidth-efficient CDMA communication over general fading multipath channels. Analytical tools from the theories of detection, estimation, minimax robustness, optimal filtering, dynamic programming, digital filtering, large deviations and error probability bounding techniques for optimum sequence detection problems will be applied, and new analytical tools sought.