电网与新能源联合供电的蜂窝中继系统的功率分配算法研究

In order to improve the energy efficiency of cellular relay systems, we study the problem of power allocation over finite time slots with grid power and new energy jointly powered system. Considering the total grid power consumption and sum rate, we propose a new utility function. Since both channel conditions and energy harvesting are time varying, we propose not only the optimal power allocation algorithm in the ideal scenario but also the one in the actual scenario. The optimization problem of the ideal case is proved to be a quasi-concave optimization problem which can be solved by the bisection method. In the actual case, the optimization problem is transformed into a linear utility function in the form of the suboptimal power allocation, and the dynamic programming Bellman equation gives the solution. Finally, the performance of these two proposed power allocation algorithms and the traditional algorithm are simulated and compared. Simulation results show that the energy efficiency of the system in two proposed algorithms are better than that of the traditional algorithm.