Performance optimization of relay nodes in wireless powered network with dynamic node location

Abstract

Microwave wireless energy transmission technology is becoming more and more mature, and how to integrate wireless energy transmission and wireless information transmission has become one of the hot research areas. This system is called wireless energy and information synchronous transmission system or synchronous wireless information and energy transmission (SWIPT) System. Synchronous wireless information and energy transmission system is of great significance to alleviate the power shortage of communication nodes and equipment. At present, there are many researches on point to point wireless information and energy transmission systems. In this paper, a system consisting of three nodes is presented, in which the intermediate node is a wireless information and energy synchronous receiving relay node, the relay node harvests the energy and retransmit information from the source node. When the location of the relay node changes dynamically, the traditional fixed-time switching for wireless energy transmission scheme cannot be realized. This paper discusses the optimization of wireless energy and information synchronization transmission of relay node under the condition of dynamic change of relay node location. The influence of relay node location on energy harvesting is fully considered and analyzed. Time switching is adjusted based on the change of relay node location to achieve the most effective and most efficient. The optimal switching time scheme improves the overall throughput performance of the system, and carries out numerical analysis.