Performance Evaluation of Smart Antennas using non blind Adaptive Algorithms

Smart antennas are of tremendous importance in mostly radar applications and wireless communication. The dispute of the current wireless communication is to laydown dependable and wide service, which provide the required capacity for communication. Smart antenna systems make use of adaptive beam forming algorithms to direct the main beam toward the user direction and eliminate the interfering signals of the same frequency from other directions without altering the position of antenna. In this paper a comprehensive study of beamforming techniques using least mean square (LMS) algorithm, normalized least mean square (NLMS) algorithm and sign error least mean square (SLMS) algorithm are done. The preciseness by which the beam is formed towards the user and the interferers are observed. It was found that the accuracy depended on step size, which is utilised in these algorithms.