An energy sharing EH-DAS model and its power allocation among RAUs

For the energy sharing problem of distributed antenna system (DAS) with energy harvesting (EH), a distributed antenna system model capable of sharing collected energy among the components in system is proposed. Compared with the existing model in literatures, the proposed model connects with smart grid through a unified interface and facilitates energy management and scheduling. Based on the proposed model, three kinds of energy sharing methods including the partial energy sharing method, the complete energy sharing method and the self-sustaining energy sharing method are analyzed. Under various energy sharing methods, the corresponding optimization problems of power allocation among the remote antenna units (RAUs) are described, formed and solved. As a result, the corresponding power allocation algorithm to each method has been concluded. Simulation results show that the proposed model is more efficient in terms of the channel capacity and energy efficiency, compared to the existing model.