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. 2018 Apr 18;18(4):1249. doi: 10.3390/s18041249

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The outputs of multi-channel processing scheme ( $M = 640$ ). (a) No echo detected; (b) Only $s^{r}$ exists ( $i = 423$ ); (c) Only $s^{d}$ exists ( $i = 0$ ); (d) $s^{r}$ and $s^{d}$ exists simultaneously ( $i = 0$ and 423).