DOA estimation using recursive 2D unitary ESPRIT
Tadaaki Kuroda, Nobuyoshi Kikuma, Naoki Inagaki · Electronics and Communications in Japan (Part I Communications) · 2003
Abstract In mobile communications, it is important to have a knowledge of the multipath wave propagation environment. It is a very effective means of analysis for this purpose to estimate the signal parameters (such as the direction of arrival) of the individual arriving waves. ESPRIT is considered an interesting parameter estimation method. It is an algorithm in which eigenvalue expansion is iteratively applied to the correlation matrix of the input data, and the parameters are estimated. The method works effectively when the number of array elements is small, but a long time is required to arrive at the estimate when the number of elements is increased. Consequently, this paper extends recursive ESPRIT based on QR decomposition, in which recursive calculation is performed, to 2D estimation. Furthermore, in order to improve computation efficiency and to make estimation pairing easy, recursive 2D unitary ESPRIT is proposed. The complex representation is used as the simplest method of pairing for the estimated signal parameters. Spatial averaging is also introduced. Computer simulations of direction angle and azimuth angle estimation for arriving waves with high correlation are performed. The features of the proposed method are thereby demonstrated from the viewpoints of accuracy of estimation, computation time, and tracking performance. Important results are obtained, which will provide a path to future development. © 2003 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 86(9): 67–77, 2003; Published online in Wiley InterScience ( www.interscience.wiley. com ). DOI 10.1002/ecja.10036