MIMO-OFDM DFSD Apparatus for detecting signal using adaptive DFSD in MIMO-OFDM system and method thereof

摘要

The present invention relates to a signal detection apparatus and method using an adaptive DFSD technique in a MIMO-OFDM system. According to the present invention, receiving a signal in a M-QAM method from a transmitting end having N _t transmit antennas, QR decomposing a channel matrix of the received signal to obtain a modified received signal with Q component removed, each subcarrier The channel value is calculated based on the minimum and maximum singular values obtained by decomposing the singular values of the channel matrix for M, and then M- for classifying the channel state sections into M by using the channel values for each subcarrier and the modulation order (M). Determining a single multi-level threshold level, comparing a channel value of each sub-carrier with a multi-level threshold level, determining a channel state section to which each sub-carrier belongs, and applying the DFSD technique to the modified received signal to each sub-carrier but by detecting the N _t received symbols, total N _t is the sub-carrier belongs to the P-th channel state interval of the M-channel state interval for the signal search technique DFSD If the tree of a first signal detection step, corresponding to the top layer out of use of all possible M-node using the node of the P piece (1≤P≤M) includes the step of detecting the received symbols. According to the present invention, by using an adaptive DFSD scheme that differently sets the number of nodes on the highest layer in the tree structure of the DFSD scheme according to the channel state for each subcarrier, an advantage of detecting a signal with a very low complexity is obtained. to provide.