A TIME-DOMAIN FILTERING SCHEME FOR THE MODIFIED ROOT-MUSIC ALGORITHM

A new superresolution technique is proposed for high-resolution estima tion of the scattering analysis. For complicated multipath propagation environment, it is not enough to estimate only the delay-times of the signals. Some other information should be required to identify the si gnal path. The proposed method can estimate the frequency characterist ic of each signal in addition to its delay-time. One method called mod ified (Root) MUSIC algorithm is known as a technique that can treat bo th of the parameters (frequency characteristic and delay-lime). Howeve r, the method is based on some approximations in the signal decorrelat ion, that sometimes make problems. Therefore, further modification sho uld be needed to apply the method to the complicated scattering analys is. In this paper, we propose to apply a time-domain null filtering sc heme to reduce some of the dominant signal components. It can be shown by a simple experiment that the new technique can enhance the estimat ion accuracy of the frequency characteristic in the Root-MUSIC algorit hm.