Comparative Study of Two Array Configurations for 2D-DOA Estimation in LS-MIMO Systems

In this paper, a comparison between two array geometries, including URA arrays and L-shaped arrays, for two-dimensional DOA estimation is presented. For each geometry, algorithm which achieved the more accurate 2D-DOA estimates is considered. Indeed, conjugate symmetry based subspace and 2D-ESPRIT estimators are, respectively, chosen for the estimation of the L-Shaped and URA structures. Various criteria are taken into consideration such us the angular spread. A comparative study of the performance of geometries is carried out in terms of RMSE over a wide range of scenarios. The advantages and drawbacks of each geometry and the respective DOA estimation approaches are illustrated through a numerical comparison. Index Terms-DOA estimation, arrays configurations, scattered channel, URA, L-Shaped.