Research On Bidirectional Wireless Information And Powertransfer Based On Single Point

As a new field of research,wireless body area network is closely related to our daily life.Wireless body area network integrates many advanced technologies,such as sensor,wireless network communication,life science and human health.It can be widely applied in medical care,health recovery,military,sports and entertainment fields.Especially in health care and disease prevention,it can be used for real-time remote monitoring of various physiological parameters of human body,it is an important means to protect human health,and provides a basis for the development of intelligence in all fields.Due to the increasing importance of health,wireless body area network is becoming the focus of attention.Therefore,a large number of scholars at home and abroad have devoted themselves to the research of wireless body area network.Energy efficiency has always been one of the factors that restrict the practical application of wireless body area network.Therefore,it is necessary to seek a high energy efficiency theory and method of energy transmission.The introduction of energy collection technology is one of the effective ways to solve the problem of energy efficiency.In recent years,domestic and foreign scholars have studied the information transmission and resource allocation in wireless communication network for the aspects of energy collection,energy harvesting,wireless energy harvesting and information transmission,and have made a series of achievements.However,there is still a lack of research on the communication based on energy collection technology in wireless body area network.Wireless body area network is different from traditional WSN,in which the energy,computing power,storage capacity and communication distance of each sensor node are limited.Therefore,it is of great theoretical and practical significance to study the energy efficiency algorithm in wireless body area network based on the energy collection technology.Due to the limitation of transmission channel,transmission power and distance of wireless body area network,the research of information transmission based on energy harvesting technology is facing many challenges.In this paper,in order to solve the problem of energy efficiency in wireless body area network,we propose wireless information and power transmission model based on single point,which lays the foundation for the research of energy harvesting in wireless body area network.The research ideas of this paper are as follows: First of all,a wireless information and power transmission model is established based on the sensor nodes distributed in the human body.For the power and time splitting transmission protocol,we ensure that the maximum information transmission rate is achieved at the same time of energy harvesting.Then,two kinds of relay modes are adopted namely amplify and forward and decode and forward.Theoretical derivation and algorithm research are carried out for energy and information transmission.Finally,the numerical verification and comparison for the algorithm are carried out by the simulation result,and the optimal solution of the system is obtained.The main contents are as follows:First,based on the location of sensor nodes,a plane transmission model for single point is established: the distance between source node and destination node is fixed,relay nodes move freely in the plane,and the corresponding path loss and channel gain are obtained according to the location of relay nodes.Second,the wireless energy and information relay assisted transmission mode are proposed,we analyze and compare the advantages and disadvantages of the two transmission modes,and point out the applicability of the two ways.In this paper,the wireless information and power transmission with relay helping are studied.Third,the transmission protocols of power splitting(PS)and time switching(TS)are used to realize wireless information and power transfer with relay helping.The coexistence problem of wireless energy transfer and information transmission in different transmission protocols is analyzed.In order to ensure the information reliability transmission in wireless body area network,a mathematical model is set up,and the proposed algorithm is optimized.Fourth,based on the single point information transmission model in wireless body area network,and the maximum information transmission rate as the optimization objective,simulation and analysis prove the feasibility and effectiveness of the wireless energy and information transmission algorithm.In this paper,the proposed transmission algorithm solves the energy efficiency problem in wireless body area network from the theoretical level.It provides reference and foundation for the application of the energy harvesting technology in wireless body area network.