Benefits of Improper Signaling for Overlay Cognitive Radio
| Title | Benefits of Improper Signaling for Overlay Cognitive Radio |
| Publication Type | Conference Paper |
| Year of Publication | 2019 |
| Authors | Lameiro, C., I. Santamaría, and P. J. Schreier |
| Conference Name | IEEE Global Communication Conference (GLOBECOM) |
| Month Published | December |
| Conference Location | Waikoloa, HI, USA |
| Abstract | This paper considers improper Gaussian signaling (IGS) in an overlay cognitive radio scenario. We follow a protocol in which the secondary user (SU) uses part of its power to relay the message for the primary user (PU) and consider a simple yet illustrative 2-user scenario. We analyze two communication schemes depending on whether or not the PU cooperates with the SU and derive closed-form expressions for the optimal transmission parameters that maximize the SU rate while ensuring a specified minimum performance of the PU. Our numerical results show that IGS may significantly outperform proper signaling and that, interestingly, the cooperative approach provides negligible performance gains over its non-cooperative counterpart. |
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