Performance Analysis of MUSIC and MVDR DOA Estimation

The communication systems use concept of smart antennas, which is based on digital signal processing algorithms. In this way, the smart antennas system becomes capable to locate and track signals by the both: users, interferers and dynamically adapts the antenna pattern to enhance the reception in Signal-of-Interest direction and minimizing interference in Signal-of-Not-Interest (SONI) direction. Hence, Space Division Multiple Access system (SDMA), which uses smart antennas, is being used more often in wireless communications, because it shows improvement in channel capacity and co-channel interference. However, performance of smart antenna system greatly depends on efficiency of digital signal processing algorithms. The algorithm uses the Direction of Arrival (DOA) algorithms to estimate the number of incidents plane waves on the antenna array and their angle of incidence. In this paper the performance of Direction-of-Arrival (DOA) algorithms MUSIC and MVDR are investigated. The simulation results shows that , the advantages in performance of one algorithm over another vary with the conditions and is significantly influenced by both of the environment as well as the system. Thus, careful consideration is imperative to the conditions and system parameters specific to the planned deployment. The algorithms have been simulated in MATLAB 7.4 version.