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. 2017 Apr 6;17(4):781. doi: 10.3390/s17040781

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© 2017 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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Relay transmission model with one eavesdropper, where $h_{S D}, h_{S R}, h_{R D}$ denote the channel fading coefficients from S to D, R, and from R to D. They are modeled as follows: $h_{S D} ~ C N (0, σ_{S D}^{2})$ , $h_{S R} ~ C N (0, σ_{S R}^{2})$ , $h_{R D} ~ C N (0, σ_{R D}^{2})$ , with $σ_{S D}^{2} = E {{| h_{S D} |}^{2}}$ , $σ_{S R}^{2} = E {{| h_{S R} |}^{2}}$ , $σ_{R D}^{2} = E {{| h_{R D} |}^{2}}$ .