On detection strategies for linearly precoded MIMO-OFDM systems

This paper considers novel receiver structures for linearly precoded MIMO-OFDM systems, making special emphasis on soft detection principles. After reviewing the operation of MMSE detectors, an optimal iterative soft receiver based on list sphere detection (LSD) is proposed. This scheme provides the best possible performance from an error rate point of view at the expense of a rather high computational cost. To address this downside, a lower complexity yet optimal detector that combines linear and non-linear processing is proposed for a class of precoders that are particularly important from a practical point of view.