Abstract
This letter aims at improving the energy efficiency of OFDMA small cell networks with data rate constraints. Different with the existing energy efficiency works that focus on the base station side, the effect of backhaul links is analyzed based on a bufferless data flow model. A joint forward and backhaul link optimization (JFBLO) scheme is proposed to iteratively increase the system energy efficiency by optimizing the emission power and backhaul data rate. The system energy efficiency is proved to be non-decreasing and convergent in JFBLO. Simulation results indicate that though occupying a small share of the total system power consumption, the emission power is necessary to be optimized to improve the system energy efficiency when the effect of backhaul links is considered.
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