Implementation of Iterative Detection in Real-World MIMO Wireless Systems

摘要

Theoretically. multiple-input multiple-output (MIMO) wireless systems can achieve remarkably high spectral efficiency as compared to conventional, single-antenna systems. This report identifies a number of problems which need to be solved in order to implement practical MIMO systems: channel estimation, correlated fading, slow fading, asynchronous reception, and frequency-selective fading. The effects of these non-ideal conditions on the performance of MIMO systems are evaluated. and directions are explored in which solutions may be found. The focus of the report is on MIMO systems employing an iterative ('turbo') receiver. The results presented are based on the iterative tree search (ITS) detection scheme developed recently at CRC, but are expected to be typical of most iterative detectors that have been proposed in the MIMO literature. The main conclusion of the report is that iterative channel estimation and further development of an ITS-based detection scheme for asynchronous and wideband reception are the two most promising topics for future research in this area.