Open Access
Table 1.
Typical Applications of relay for Covert Communications
| Ref | Main feature | Roles of relay |
|---|---|---|
| [16, 17] | Relay transmits covert information to | Amplify-and-forward the original message |
| the destination on top of forwarding | and superpose the covert information on | |
| the source’s message. | the existing communication. | |
| [19] | Relay can flexibly choose | Amplify-and-forward the covert information |
| the FD or the HD mode. | and send jamming signal to disturb Willie. | |
| [20] | The relay-to-destination link | Decode-and-forward the original message |
| is selected to forward the information. | and superpose the covert information on | |
| the existing communication. | ||
| [21] | Linear multi-hop relaying network | Decode-and-forward the covert information. |
| is monitored by UAV. | ||
| [22] | Multi-hop covert communication | Decode-and-forward the covert information |
| find optimal routing under multiple | with a single key or independent keys. | |
| collaborating Willies’ surveillance. |
Note: This is text of the table footnotes.
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