| Title | Partial Forward-Backward Averaging for Enhanced Frequency Estimation of Real X-texture Modes |
| Authors | Joakim Axmon, Maria Sandsten, Leif Sörnmo |
| Alternative Location | http://dx.doi.org/10.1109/T..., Restricted Access |
| Publication | IEEE Trans. on Signal Processing |
| Year | 2005 |
| Volume | 53 |
| Issue | 7 |
| Pages | 2550 - 2562 |
| Document type | Article |
| Status | Published |
| Quality controlled | Yes |
| Language | eng |
| Publisher | IEEE |
| Abstract English | In this paper, enhancement of the signal root estimation of a particular kind of real-valued two-dimensional (2-D) sinusoidal modes is considered. To its constitution, each mode corresponds to the superposition of two real-valued plane waves in a particular symmetry. The concept of partial forward-backward averaging, which is applicable for modes that are undamped in at least one dimension, is introduced as a means for improving the signal subspace estimate from which the signal roots are estimated. The consequences of real-valued signals for the signal root estimates are discussed in detail, and it is shown that by applying partial forward-backward averaging, the mean square errors of the estimates, and the breakdown threshold signal-to-noise ratio (SNR), are significantly reduced, compared with forward-only or conventional forward-backward (when applicable) usage of the sampled signals. The practical implication is highlighted by applying the proposed technique to modal analysis of multichannel impact responses from a tree trunk. |
| ISBN/ISSN/Other | ISSN: 1053-587X |
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