Patent ID: 8135099
Filing Date: 2012-03-13
Classification: H04B

Abstract:
1. A transmission symbol detection method of a multiple antenna system including a plurality of transmission antennas, the method comprising: estimating a first matrix comprising a channel matrix including a plurality of channel gains respectively corresponding to the plurality of transmission antennas by using a received signal; calculating a second matrix comprising an upper-triangle matrix and a third matrix comprising a unitary matrix from the first matrix; and detecting a plurality of transmission symbols by performing successive interference cancellation (SIC) based on the second and third matrixes, checking a channel condition of each of the plurality of transmission antennas; and determining a detection order of the plurality of transmission symbols based on the channel condition, wherein the second matrix comprises a first component and a second component as diagonal components, where the first component corresponds to a first channel gain of the first matrix and the second component is calculated based on the first channel gain and on a second channel gain that is different from the first channel gain, and the second matrix further comprises a plurality of components determined by using the first channel gain and a plurality of channel gains that are different from the first channel gain, wherein the plurality of transmission symbols corresponds to a first symbol group including a pair of first and second symbols and a second symbol group including a pair of third and fourth symbols, wherein the determining of the detection order detects the first symbol group first before the second symbol group when a channel condition of the first symbol group is determined to be better than a channel condition of the second symbol group and comprises detecting of a plurality of transmission symbols that represent a minimum Euclidean metric by using the second and third matrixes, and wherein the detecting of the plurality of transmission symbols comprises detecting the first symbol group that minimizes a first metric and detecting the second symbol group that minimizes a second metric.