An Efficient DOA Estimation Algorithm for Smart Antenna Systems in Multipath Environment

摘要

This study proposes an efficient Direction of Arrival (DOA) estimation algorithm with Uniform Linear Array (ULA) for smart antenna systems in multipath environment. To cope with the coherent signals caused by multipath propagation, the proposed algorithm first exploits an extended covariance matrix, achieves the maximum singular vector for the information of the coherent signals. Finally the proposed algorithm constructs a Toeplitz matrix to resolve the coherent signals. In the case of DOA estimation for three coherent signals, at RMSE = 0.4, the proposed algorithm results in a gain improvement of about 3 dB over the Estimation of Signal Parameter via., Rotational Invariance Techniques (ESPRIT)-like algorithm and about 7.5 dB over the Forward Backward Spatial Smoothing (FBSS) algorithm. Theoretical results also demonstrate the proposed algorithm can resolve more coherent signals.