A COMPARATIVE BEAMFORMING ANALYSIS OF LMS & NLMS ALGORITHMS FOR SMART ANTENNA
Journal Title: International Journal of Advanced Research in Computer Engineering & Technology(IJARCET) - Year 2013, Vol 2, Issue 8
Abstract
Beamforming is a technique of directional signal transmission and recitation. Now a days, because of an increasing demand on wireless communication (like RADAR, satellite communication, mobile communication, broadcasting etc.) the beamforming technique plays a vital role for good transmission and reception purpose. By changing the phase and amplitude of the exciting currents in each of the antenna elements, it is possible to electronically scan the image lobe and/or place nulls in any direction. In beamforming, each users signal is multiplied with complex weights that adjust the magnitude and phase of the signal to and from each antenna. This causes the output from the array of antennas to form a transmit/receive beam in the desired direction and minimizes the output in other direction. In this paper we use different version of LMS adaptive algorithm (basically LMS and NLMS) to steer the antenna beam in particular desired direction. The radiation pattern of for each case plotted in polar plot. Here we steer the beam of of the system in two way (1) Considering the desired direction (position) are in uniformly distributed (2) The desired direction are non uniformly distributed. We campier their simulation results of each case with each other. Adaptive signal processing sensor arrays, known also as smart antennas .The smart antenna adaptive algorithms achieve the best weight vector for beam forming by iterative means
Authors and Affiliations
Priyanka Yadav , Prof. Smita Patil
Keywords
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