Energy Efficient Design for Two-Way AF Relay Networks

Abstract EN

Conventional designs on two-way relay networks mainly focus on the spectral efficiency (SE) rather than energy efficiency (EE).

In this paper, we consider a system where two source nodes communicate with each other via an amplify-and-forward (AF) relay node and study the power allocation schemes to maximize EE while ensuring a certain data rate.

We propose an optimal energy-efficient power allocation algorithm based on iterative search technique.

In addition, a closed-form suboptimal solution is derived with reduced complexity and negligible performance degradation.

Numerical results show that the proposed schemes can achieve considerable EE improvement compared with conventional designs.