Abstract
In this study, the spectral efficiency (SE) and energy efficiency (EE) tradeoff in full-duplex (FD) two-hop decode-and-forward (DF) relaying system is studied by considering the influence of residual self-interference. In order to increase the SE of the traditional DF relaying system, firstly, an optimal power allocation (OPA) method is proposed, and the SE and EE analyses of the system are obtained. Secondly, by applying an unified SE–EE tradeoff metric, the multi-object joint SE and EE maximisation problem is formulated as a single-objective joint maximisation problem for SE and EE. Furthermore, the optimal total transmission power of the single-objective joint SE and EE maximisation problem is obtained according to the tradeoff factors. Theoretical analysis and numerical results show that the proposed OPA method significantly improve the system's SE and EE. At the same time, it reveals that the tradeoff between the SE and EE can be flexible by setting the tradeoff factors.
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