Patent ID: 8295374

Claim:
A signal detecting method, comprising: receiving a receiving signal vector y through a number of channels, wherein the receiving signal vector y corresponds to a transmitting signal vector x transmitted by at least one of the channels; determining a channel matrix H, wherein the channel matrix H represents at least one of the channels; choosing a factorization matrix D, wherein the factorization matrix D is invertible to make the channel matrix H factorized as H={tilde over (H)}D, {tilde over (H)} is a corresponding channel matrix; determining the factorization matrix D to make an expected value of the signal estimate error become smaller, wherein the step of determining the factorization matrix D comprises determining a covariance matrix Φ MMSE =DAD H , wherein matrix A is a first intermediate matrix correlated with the channel matrix H and a signal to noise ratio; and detecting the receiving signal vector y to estimate the transmitting signal vector x according to the corresponding channel matrix {tilde over (H)} and the factorization matrix D.