Efficient Architecture for Soft-Input Soft-Output Sphere Detection With Perfect Node Enumeration

The application of the turbo principle allows to exploit the full potential of multiple-input multiple-output (MIMO) communications at the cost of increasing the computational effort at the receiver. In the context of soft-input soft-output tree search detection, the computation of metric values and the optimal node order represents two of the most computationally demanding operations. Heuristic approaches may be applied to reduce the...