Research on joint optimization algorithm for time slot and power in SWIPT

Abstract:

Traditional communication system fails to utilize the energy of radio frequency signals effectively, which can result in high transmission energy consumption. Therefore, resources must be allocated reasonably to achieve a compromise between information and energy transmission. That is to ensure sufficient transmission energy and improve the information transmission performance of the system as much as possible. In order to save the energy of the communication system, this paper proposes that the communication system simultaneously transmits information and energy in multiple time slots to realize Simultaneous Wireless Information and Power Transfer (SWIPT). First, the transmission time was divided into a number of time slots, and the transmitter transmitted information or energy in different time slots as required. Then, the receiver collected information or harvested energy in the corresponding time slot, and the obtained energy was used to provide circuit energy consumption. Finally, by jointly optimizing the time slot and power allocation, the system transmission rate was maximized based on the guaranteed system energy requirements. Simulation results show that compared with the equal-time power allocation algorithm, the transmission efficiency of the proposed algorithm was improved by about 40 bps, and the performance was significantly improved with the increase of the number of the time slots. When the transmission energy increased, the distributable information power was greater. When the energy demand increased, the information power decreased, and more power was used for energy transmission. Hence, an algorithm was proposed to maximize the performance of information transmission by reasonably allocating time slots and power for information transmission and energy harvesting to ensure sufficient acquisition energy. Therefore, the proposed algorithm could improve the transmission performance effectively via harvesting the wireless power.