Iterative detection of MIMO transmission using a list-sequential (LISS) detector

For iterative detection in systems employing multiple antennas with an outer code we need a MIMO detector delivering a-posteriori probabilities (APP) about the coded bits. Full-APP detection would lead to prohibitive complexity, therefore we extend for high-level signals the concept of the sphere decoder using an approach from sequential decoding instead of geometrical considerations. We show how a priori information can be incorporated into the metric, which is then optimized by systematic tree search. Furthermore, we show how the reliability of the resulting L-values can be improved by augmenting the complete search tree. Simulation results show an improved performance over the list sphere decoder.