A Novel Approach for Estimation of Electrical Bioimpedance: Total Least Square
Paper in proceedings, 2007

There are several methods used for AC-impedance estimation in Electrical Bioimpedance measurements. In this paper we propose a novel method for digital estimation of electrical impedance based in the Total Least Square (TLS) technique and we carry out a performance comparison between the proposed method and the typical Digital Sine Correlation (DSC) method. The TLS method has been implemented using the Singular Value Decomposition approach and the performance of both methods have been compared in terms of robustness against noise and size of the data set. The results indicate that the TLS method shows a better performance for impedance estimation than the DSC with reduced set of measurement samples and high SNR levels, while its performance worsen for increasing number of samples and decreasing SNR. The DSC method exhibits a better robustness against noise, especially for increasing the number of data samples. The main observed advantage of the TLS method is that it suffers from less mathematical constrains than the DSC method, and since the noise levels in bioimpedance applications are not expected to be very high we conclude that the TLS method is a good choice as impedance estimator.

Digital Impedance Estimation

Sine Correla-tion

Total Least Square.

Bioimpedance

Author

Fernando Seoane Martinez

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Biomedical Signals and Systems

Kaj Lindecrantz

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Biomedical Signals and Systems

International Federation for Medical and Biological Engineering Proceedings

1680-0737 (ISSN)

Vol. 17 190-193

Subject Categories

Medical Laboratory and Measurements Technologies

Control Engineering

Mathematical Analysis

ISBN

978-3-540-73840-4978-3-540-73841-1

More information

Created

10/8/2017