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With the advancement of battery technology, energy harvesting communicationsystems attracted great research attention in recent years. However, energyharvesting communication systems with multiple transmitters and multiplereceivers have not been considered yet. In this paper, the problem ofbroadcasting in a communication system with multiple energy harvestingtransmitters and multiple receivers is studied. First, regarding thetransmitters as a 'hole transmitter' [1], the optimal total transmission poweris obtained and the optimal power allocation policy in [2] is extended to oursystem setup, with the aim of minimizing the transmission completion time.Then, a simpler power allocation policy is developed to allocate the optimaltotal transmission power to the data transmissions. As transmitter switchingcan provide flexibility and robustness to an energy harvesting communicationsystem, especially when a transmitter is broken or the energy harvested by atransmitter is insufficient, a transmitter switching policy is furtherdeveloped to choose a suitable transmitter to work whenever necessary. Theresults show that the proposed power allocation policy performs close to theoptimal one and outperforms some heuristic ones in terms of transmissioncompletion time. Besides, the proposed transmitter switching policy outperformssome heuristic ones in terms of number of switches.

Power Allocation and Transmitter Switching for Broadcasting with Multiple Energy Harvesting Transmitters