Improved Direction-of-Arrival Estimation for Uncorrelated and Coherent Signals in the Presence of Multipath Propagation

The authors propose a novel direction-of-arrival (DOA) estimation method for signals that are uncorrelated, partially coherent or fully coherent in the presence of multipath propagation. First, uncorrelated and coherent signals are distinguished by the rotational invariance techniques as well as the property of the moduli of eigenvalues. The DOAs of the uncorrelated signals are then estimated based on their related eigenvalues. Finally, the singular value decomposition of virtual steering vectors is used to estimate the DOAs of the coherent signals while avoiding the cross-term effects. The effectiveness and efficiency of the proposed method are demonstrated by the simulation results.