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

摘要

Coordinated multipoint (CoMP) joint transmission (JT) can save a great dealof energy especially for cell-edge users due to strengthened received signal,but at the cost of deploying and coordinating cooperative nodes, which degradesenergy efficiency (EE), particularly when considerable amount of energy isconsumed by nonideal hardware circuit. In this paper, we study energyefficientcooperation establishment, including cooperative nodes selection (CNS) andpower allocation, to satisfy a required data rate in coherent JT-CoMP networkswith non-ideal power amplifiers (PAs) and circuit power. The selection prioritylemma is proved first, and then the formulated discrete combinatorial EEoptimization is resolved by proposing node selection criterion and derivingclosedform expressions of optimal transmission power. Therefore, an efficientalgorithm is provided and its superiority is validated by Monte Carlosimulations, which also show the effects of non-ideal PA and the data ratedemand on EE and optimal number of active nodes.