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Abstract
In recent years, adaptive or smart antennas have become a key component for various wireless applications such as radar, sonar and 4G cellular mobile communications. The DOA estimation and beamforming in array signal processing is one of the important and emerging research areas. The effectiveness of this direction of arrival estimation greatly determines the performance of smart antennas. This paper presents an overview of direction of arrival estimation using the MUSIC algorithm and beam formation using LMS algorithm. In presence of correlated input signals, the LMS have extremely slow convergence rates. The proposed improved LMS algorithm reduces mean square error and increases the convergence speed by large amount as compared to existing beamforming algorithms. As the conventional MUSIC algorithm is found to have less efficiency for coherent signals, better simulations using an improved MUSIC algorithm in provided in this paper.