DETECTION METHOD AND APPARATUS FOR MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) SYSTEM

The present application provides a detection method and apparatus for a multiple-input multiple-output (MIMO) system. The method comprises: determining a conjugate symmetric matrix; using a preprocessing matrix and a unit lower triangular matrix to map a transmitting signal to a tree search model, wherein the preprocessing matrix and the unit lower triangular matrix are obtained by performing LDL decomposition on the conjugate symmetric matrix; performing downward extension layer by layer from the topmost layer of the tree search model, and determining sets of metrics, wherein the sets of metrics comprise a set of metrics of a root node and a set of metrics of a plurality of leaf nodes, the set of metrics of the root node is comprised in a first candidate set, the first candidate set is determined from a first constellation point set according to a first rule, and the sets of metrics enable the tree search model to have a minimum path metric; and according to the sets of metrics, determining a log likelihood