Patent ID: 8098777

Claim:
A receiving apparatus of a multiple input multiple output (MIMO) system, the receiving apparatus comprising: a layer arrangement unit for rearranging channel estimated layers for a received signal based on reliability of the each of the layers, wherein the reliability of each of the layers is determined based on a reception quality of each of the layers; and a symbol detection unit for detecting a transmission symbol vector according to the layers that are rearranged by the layer arrangement unit, wherein the symbol detection unit detects the transmission symbol vector according to the layers rearranged by the layer arrangement unit by: QR-decomposing a channel matrix H rearranged after the layer arrangement unit rearranges the channel estimated layers for the received signal, based on the reliability of the each of the layers; considering all constellation points for a symbol of a layer having a lowest reliability among the layers rearranged after the layer arrangement unit rearranges the channel estimated layers for the received signal based on the reliability of the each of the layers, based on signals obtained by applying a matrix QH to the received signal; and detecting the symbol by performing sequential interference elimination.