Efficient joint subcarrier and power allocation for achieving green multiuser full-duplex decode-and-forward relay networks

In this paper, we investigate resource allocation algorithm for multiuser full-duplex (FD) decode-and-forward (DF) relay network for improving the energy efficiency (EE). The problem of energy-efficient joint subcarrier and power allocation is formulated as a ratio of the spectral efficiency (SE) of the network to the total energy consumption in the network. The formulated problem is a non-convex fractional mixed binary-integer non-linear programming problem. Further, we resolve this problem by a series of convex transformations and introduce a network penalty factor, which works as EE parameter, to convert the fractional mixed-integer form into a parametric subtractive form, and then design an effective energy-efficient iterative resource allocation algorithm to find the optimal solution. In addition, we also propose a low-complexity suboptimal algorithm. The effectiveness of the proposed iterative and suboptimal algorithms are evinced by simulation results.