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DOA Estimation of Uncorrelated and Coherent Signals in Multipath Environment Using ULA Antennas

U.Somalatha, T.V.S.Gowtham Prasad, T. Ravi Kumar Naidu

A Smart antenna plays an important role in advanced wireless communication systems. One of the most important property of smart antenna is that it is capable of directing its main beam towards the direction of desired signal and forming the nulls in the direction of interfering signals. The various Direction of Arrival (DOA) estimation algorithms are used to locate the desired signal in smart antenna system. This paper presents an effective spatial differencing method for DOA estimation of multiple uncorrelated and coherent narrowband signals. In this method, uncorrelated sources are estimated using conventional subspace methods and the remaining coherent signals are estimated using the spatial differencing technique. The performance of this DOA estimation algorithm based on Uniform Linear Array (ULA). Simulation results shows that proposed method can obtain higher resolution and accuracy as the number of array elements increases