Optimal Energy-Efficient Transmission in Multiuser Systems with Hybrid Energy Harvesting Transmitter

This paper considers the optimal energy-efficient transmission policy in time-sharing multiuser systems with a hybrid energy harvesting transmitter. The system operation energy is supplied by a constant energy source which is driven by a non-renewable resource and an energy harvester which harvests energy from its surrounding environment. Our goal is to maximize the energy-efficient transmission of multiuser systems considering the allocation of power and transmission time jointly in an off-line manner. The original nonconvex objective function is transformed into convex optimization problem via the fractional programming approach. Furtherly, we solve the convex problem by Lagrange dual decomposition method. Simulation results show that the proposed energy-efficient transmission policy has a better performance than the transmission policy which decomposes optimization problem into two parts (power allocation, time allocation) to solve iteratively.