Method and apparatus for soft output fixed complexity sphere decoding detection

Abstract

Provided are an SFSD detection method and apparatus, and the method includes: QR decomposition is performed on a channel response matrix to acquire a Q matrix and an R matrix; the conjugate transpose of the Q matrix is multiplied by a received signal to acquire an equalized signal of the received signal; ML path detection is performed on the equalized signal, reserved nodes in respective layers are decreased layer by layer to acquire an ML path, and branches as many as iterations are reserved; ML complementary set path detection is performed on the branches, and all nodes of an acquired complementary set layer are reserved and reserved nodes in other layers are decreased layer by layer to acquire an ML complementary set path; and LLR information of each bit of each symbol of each layer is acquired according to the ML path and the ML complementary set path. For more-than-two-layer MIMO, the disclosure can acquire a detection performance approaching the ML performance and meet requirements on acceptable hardware implementation complexity.