Advanced Techniques for MIMO Broadband Communications

摘要

Multiple input multiple output (MIMO) systems can provide high diversity, high data rate or a mix of both, for wireless communications. This report combines both modes and suggests analyses and techniques that advance the state of the art of MIMO systems. Specifically, this report studies turbo space-time coding schemes for MIMO systems. Before the designs of turbo space- time codes are presented, a fundamental tool to analyze and design turbo coding schemes, the extrinsic information transfer (EXIT) chart method, is extended from the binary/nonbinary code case to coded modulation case. This extension prepares the convergence analysis for turbo space-time code. Turbo space-time codes with symbols pre-coded by randomly chosen unitary time variant linear transformations (TVLT) are investigated in this report. It is shown that turbo codes with TVLT achieve full diversity gain and good coding gain with high probability.