Summary
International Symposium on Antennas and Propagation
2012
Session Number:2C3
Session:
Number:2C3-2
Evaluation and Comparison of DOA Estimation Methods with Estimated Number of Signals
Kazuto Sugimoto, Nobuyoshi Kikuma, Hiroshi Hirayama, Kunio Sakakibara,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
Recently, the development of mobile communications is making radio wave environments more complicated. To model radio wave environment appropriately, DOA (directions of arrival) estimation of individual incoming waves with array antenna is much effective. For the purpose, many DOA estimation methods have been developed. Among them, the high-resolution DOA estimation methods such as MUSIC and ESPRIT attract considerable attention. One of their features is to require the information on the number of incident waves in advance. In the performance evaluation of MUSIC or ESPRIT, the exact number of incident waves is often assumed to be known a priori. However, it is natural in the practical situation that the number of incident waves should be estimated before the DOA estimation. Thus, the methods of estimating the number of incident waves have been investigated because the incorrect number of waves may cause performance degradation of DOA estimation. In this paper, we extend the calculation of RMSE of DOA estimates in order to use the estimated number of waves, and further propose the procedure to improve the DOA estimation accuracy with the estimated number of waves. This procedure features estimating DOAs with larger number of waves than the one obtained from improved MENSE (I-MENSE) and extracting the likely DOA estimates with likelihood function of DOA. From comparison between the EVD(eigenvalue-decomposition)-based method (MUSIC) and non-EVD-based method (I-SUMWE), it is found that the proposed procedure using I-SUMWE provides a significant improvement in DOA estimation over the conventional procedure using just the estimated number of waves by I-MENSE.