• Pooja Devi
• Dr. Prashant Kumar Jain

Adaptive antenna is an array of antenna elements with signal processing capability to optimize its radiation pattern in response to the changing signal environment. Adaptive antenna aims at increasing the gain in the direction of desired user and direct nulls in the direction of interfering signals. It involves processing of signals induced on an array of antennas that can estimate the direction of radiating sources and calculate optimum weights for adaptive beamforming. This paper presents a performance evaluation of different direction of arrival (DOA) estimation and adaptive beamforming algorithms. The simulation results show that proposed algorithms provides more accurate and stable results among other DOA estimation techniques while Improved NLMS algorithm shows the fastest convergence rate among other beamforming algorithms. We show that the propose method has achieved good resolution performance better the other direction arrival estimation algorithm. The new proposed algorithms provides fast convergence rate, higher interference suppression capability and low level of minimum Mean Square Error (MSE) at the steady state compared other conventional (i.e. LMS, NLMS, LLMS, VSSNLMS& MIR-LMS) algorithms. The simulation results show the effectiveness of the proposed method.

Smart Antenna, LMS, NLMS, LLMS, MI-NLMS, VSSNLMS, Beamforming, MIR-LMS, convergence speed.

"Robust Adaptive Beamforming with DOA Estimation for Smart Antenna", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 9, page no.e166-e174, September-2021, Available :http://www.jetir.org/papers/JETIR2109415.pdf

"Robust Adaptive Beamforming with DOA Estimation for Smart Antenna", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 9, page no. ppe166-e174, September-2021, Available at : http://www.jetir.org/papers/JETIR2109415.pdf