Full-Duplex Duplex Regenerative Relaying and Energy Energy-Efficiency Efficiency Optimization Over Generalized Asymmetric Fading Channels
Abstract: This paper is devoted to the end end-to-end end performance analysis, optimal power allocation (OPA), and energy-efficiency energy (EE) optimization of decode decode-and-forward (DF)-based full-duplex duplex relaying (FDR) and half half-duplex duplex relaying (HDR) systems. Unlike existing analyses and works that assume simplified transmission over symmetric fading channels, we consider the more realistic case of asymmetric a multipath fading and shadowing conditions. To this end, exact and asymptotic analytic expressions are first derived for the end-to-end end end outage probabilities (OPs) of the considered DF-FDR FDR set ups. Based on these expressions, we then formulate the OPA and EE optimization problems under given end end-to-end end target OP and maximum total transmit power constraints. It is shown that OP in FDR systems is highly dependent upon the different fading parameters and that OPA provides substantial performance gains, particularly, when the relay self self-interference (SI) level is strong. Finally, the FDR is shown to be more energy-efficient energy efficient than its HDR counterpart, as energy savings beyond 50% are feasible even for moderate values of the SI levels, especially at larger link distances, under given total transmit power constraints and OP requirements.