Adaptive DOA estimation using a database of eigenvectors
Eiji Mochida, Youji Iiguni · Electronics and Communications in Japan (Part III Fundamental Electronic Science) · 2006
Abstract With the dramatic advances in mobile communication technologies, the problem of estimating the direction of arrival (DOA) of signals generated by several sources becomes even more important. High‐resolution estimation methods based on eigenvalue decomposition include the minimum‐norm method and the MUSIC method. Since the peak of the angular spectrum must be scanned over all directions, the computational effort is enormous. In this paper, a DOA estimation method using a database is proposed. In this method, a database is constructed in which the eigenvector corresponding to the minimum eigenvalue is the key and the DOA is the associated value. The DOA is estimated by seeking in the database the data with the key closest to the eigenvector obtained from the observation signals. In the proposed method, DOA estimation can be achieved by only a regional search of the database, and hence the process is extremely fast. Finally, the effectiveness of the proposed method is demonstrated by simulation. © 2006 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 90(3): 48–56, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/ecjc.20251