Abstract
Regarding the secure transmission of the physical layer of the distributed antenna system, the optimization problem of the power allocation among the remote antenna units is studied. Firstly, the security transmission model of the energy sharing distributed antenna system is established. Then, the optimization problem targeting at maximizing the energy efficiency of the system is formulated. This optimization problem is solved by two steps. The power is firstly optimized omitting the constraint of limited energy harvested by the remote antenna units and then the power is further optimized under the constraint of limited harvested energy. Finally, the model is simulated when the artificial noise is added in system and the relationship between the energy efficiency and the number of eavesdropping users is investigated.
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