A Method for Estimating the Direction of Arrival of Coherent Signals on Arbitrary Antenna Array in Multi-path Scenarios
Qinye Yin · Xi'an Jiaotong Daxue xuebao · 2009
In order to estimate direction of arrival(DOA) of coherent signals in multi-path propagation,a new estimation algorithm DOA-CSAA is proposed.The generalized steering vector corresponding to each user is estimated by jointly adopting the time-domain and space-domain correlations.Then the direction-of-arrival of every multi-path is estimated within each user's group.The proposed method,which is capable of identifying more DOAs than the methods that are based on fourth-order statistics,uses second-order statistics only,hence its computational complexity is much lower.Since the forward/backward spatial smoothing technique is not adopted in the proposed method,arbitrary geometry arrays are applicable.The method can estimate at most M(M-1) impinging DOAs using an arbitrary geometry array with M antennae.Simulation results and comparison with the forward/backward spatial smoothing techniques under the same simulation conditions show that the DOA-CSAA can obtain nearly 20 dB signal-to-noise ratio gain when the root mean square error of approximation is between 10-4 and 10-3.