Energy Efficiency Maximization for CoMP Joint Transmission with Non-Ideal Power Amplifiers

TL;DR

This paper proposes an energy-efficient cooperation and power allocation scheme for CoMP joint transmission networks considering non-ideal power amplifiers and circuit power, optimizing energy efficiency while satisfying data rate requirements.

Contribution

It introduces a novel node selection criterion and closed-form power allocation expressions for energy-efficient CoMP JT with non-ideal hardware, validated by simulations.

Findings

Optimal number of active nodes depends on PA efficiency and data rate demand.

Proposed algorithm outperforms baseline methods in energy efficiency.

Non-ideal PAs significantly impact energy efficiency and node selection.

Abstract

Coordinated multipoint (CoMP) joint transmission (JT) can save a great deal of energy especially for cell-edge users due to strengthened received signal, but at the cost of deploying and coordinating cooperative nodes, which degrades energy efficiency (EE), particularly when considerable amount of energy is consumed by nonideal hardware circuit. In this paper, we study energyefficient cooperation establishment, including cooperative nodes selection (CNS) and power allocation, to satisfy a required data rate in coherent JT-CoMP networks with non-ideal power amplifiers (PAs) and circuit power. The selection priority lemma is proved first, and then the formulated discrete combinatorial EE optimization is resolved by proposing node selection criterion and deriving closedform expressions of optimal transmission power. Therefore, an efficient algorithm is provided and its superiority is validated by Monte Carlo simulations, which also show the effects of non-ideal PA and the data rate demand on EE and optimal number of active nodes.