Spatial signature estimation algorithm based on high order cumulant and its application
Wei Zhou, Zhengzhong Zhou · Systems engineering and electronics · 2006
Based on uniform linear array and fourth order cumulant of array output signal,a novel algorithm for spatial signature estimation is presented and applied to estimate multi-user spatial signature in the coherent multi-path environment.Using the fourth order cumulant of array output,a spatial signature matrix is constructed,which is proved to be effective to estimate multi-user spatial signature via eigen-decomposition.Then,based on spatial signature estimation and forward/conjugate backward spatial smoothing technique,the direction-of-arrival(DoA) of coherent multple paths is estimated.The algorithm,which is a fully-blind,estimation method independent of the specific characteristic of the signals,is suitable to arbitrary additive Gaussian noise,and each DoA can automatically match the sources.Theoretical analysis and computer simulation prove the effectiveness and robustness of the algorithm.