Abstract
New smart antenna systems use spatial diversity techniques to avoid the noise and interference from unwanted directions. That means, they ‘adapt’ or ‘modify’ the antenna beam in an intended direction from where the transmission is coming from. Since, most antenna systems today are the arrays with multiple radiators, such beam forming technique requires fairly accurate estimate of direction of arrival. The performance of smart antenna systems in that case gets greatly affected by how accurate the directional of arrival (DOA) algorithm in the array signal processing works. The work done here investigates the DOA algorithms implemented with MUSIC, ESPRIT and another technique that uses mechanical rotation of the antenna array. In simulation using MATLAB, mechanical array rotation can be implemented by creating nulls in the direction of interferes. This paper produces comparative study from results obtained in these three approaches considering three dimensional scenarios.
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