A Time-Domain Filtering Scheme for the Modified Root-MUSIC Algorithm

Hiroyoshi YAMADA  Yoshio YAMAGUCHI  Masakazu SENGOKU  

IEICE TRANSACTIONS on Communications   Vol.E79-B   No.4   pp.595-601
Publication Date: 1996/04/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
modified Root-MUSIC algorithm,  time-domain filtering,  beamspace Root-MUSIC algorithm,  electromagnetic scattering,  frequency decay parameter,  

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A new superresolution technique is proposed for high-resolution estimation 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 signal path. The proposed method can estimate the frequency characteristic of each signal in addition to its delay-time. One method called modified (Root) MUSIC algorithm is known as a technique that can treat both of the parameters (frequency characteristic and delay-time). However, the method is based on some approximations in the signal decorrelation, that sometimes make problems. Therefore, further modification should be needed to apply the method to the complicated scattering analysis. In this paper, we propose to apply a time-domain null filtering scheme to reduce some of the dominant signal components. It can be shown by a simple experiment that the new technique can enhance estimation accuracy of the frequency characteristic in the Root-MUSIC algorithm.