Research On WBAN Information And Power Transmission Technology Based On Time Allocation And Power Splitting

Wireless Body Area Networks(WBANs)are composed of a variety of distributed sensor nodes located inside,on or outside the body.It is also a kind of wireless Ad hoc network with the function of information sensing,processing and transmission.As an extension of Wireless Sensor Networks(WSNs),WBANs have the characteristics of dynamics,heterogeneity,small network scale,limited energy,and fast signal attenuation.With the ultra-high-speed,low-latency,high-reliability fifth-generation(5G)communication technology becoming more mature and the communication infrastructure construction becoming more and more perfect,it has created superior external conditions for wireless body area networks.At the same time,under the dual promotion of policies and technologies,wireless body area networks have greatly reduced medical costs and are conducive to alleviating the pressure of scarce social medical resources.In addition to the medical field,the wireless body area network,as an important part of the 5G commercialization process to build the Internet of Things,plays a positive role in improving the efficiency of the automotive,entertainment and service industries.Even in the military and fire protection fields,it has attracted great attention.The miniaturized sensors located inside or outside the body sense the physiological parameters of the human body in real time and transmit data to the health monitoring center via WIFI,Bluetooth or mobile communication.However,the miniaturization and lightweight technology of sensors are promoting the development of wireless body area networks.At the same time,they also face the challenge of limited network energy.Therefore,how to improve the life cycle of sensors and to achieve network sustainability are urgent problems.Traditional new energy sources such as solar energy,vibration energy and thermal energy have the disadvantages of instability,high cost,and susceptibility to weather.At the same time,it cannot meet the requirements of mobile wearable devices.The radio frequency(RF)energy harvesting method solves the problem of frequent battery replacement.On the one hand,RF has the characteristics of transmitting energy and information at the same time.On the other hand,it has the advantages of sustainable,stable and reliable,low cost and no noise.It is suitable for wireless body area networks in any environment and realizes energy self-sufficiency of the network.In addition,this paper selects a power shunt and time allocation receiver structure suitable for wireless energy and information transmission system models.It improves the sensor's ability to wireless RF energy collect and information decode.The human body is a non-uniform and lossy communication transmission medium composed of organizational layers with different electronic characteristics.The channel state is often disturbed by communication distance,communication frequency,white gaussian noise(WGN)and shadow effects.Therefore how to efficiently and reliably transmit information data is an important indicator for judging the performance of wireless body area networks.At present,most of the researches on wireless body area networks are limited to simple point-to-point energy and information transmission models and relay cooperative transmission models,which cannot realize accurate sensing and transmission of various physiological parameters.In addition,due to the dynamic nature of the wireless body area network,the human body can be in an extreme weather environment at any time,resulting in the energy collected by the sensors cannot meet the consumption of information transmission.In view of the above problems,this paper proposes the research of information and energy transmission based on multipoint wireless body area network(MP-WBAN),with the goal of improving the efficient and reliable transmission of system information.The main research ideas are as follows: First,under the characteristics of wireless body area networks,a multipoint wireless energy and information transmission model under abnormal situations and a multipoint wireless energy and information transmission model under normal situations are designed;Secondly,according to the system model,a wireless energy and information transmission protocol is proposed,and the proposed protocol is theoretically derived and analyzed in depth.In order to improve the system performance,three optimization algorithms are studied;Finally,the proposed protocol and algorithm are simulated and verified.The main work of this article is as follows:1.By studying the network structure,channel state and application scenarios of wireless body area networks,two types of bidirectional information and energy transmission and simultaneous transmission models based on multipoint wireless body area networks are constructed.Combined with energy harvesting technologies,wireless radio frequency energy harvesting is used to extend the life cycle of the network.2.A bidirectional transmission protocol based on time allocation is proposed.The theoretical derivation is carried out according to the proposed protocol.The sum throughput maximization(STM)algorithm has been studied to improve the overall information transmission rate of the system.At the same time,in order to achieve a fair distribution of resources,a minimum throughput maximization(MTM)algorithm was proposed to improve the fairness of the system.3.A multipoint signal-to-energy simultaneous transmission protocol based on hybric time allocation and power splitting is proposed,and a wireless RF energy receiver structure is designed to ensure efficient and reliable transmission of physiological parameters and energy.According to the signal-to-energy simultaneous transmission protocol,an optimization algorithm is proposed to maximize throughput and improve the stability and effectiveness of system information transmission.4.According to the above two communication protocols,a simulation comparison experiment is performed through MATLAB,and the proposed optimization algorithm is compared with the equal time allocation(ETA)algorithm to verify the accuracy of the protocol.The above research content provides new ideas and new methods for achieving the efficient and reliable transmission of system information and the challenge of fair resources allocation.The innovative content is expanded based on existing research,which lays the foundation for subsequent research.