Research On Energy Accumulation And Relay Cooperation Based On WSN

As the important technology carrier for development of information society today,wireless sensor network is a wireless network formed by a large number of sensor nodes distributed in a fixed area according to their respective uses,and it is formed by multi-hop or self-organizing.The wireless communication protocol is used as a mean to realize information interaction between each sensor node,and finally datas acquisition and transmission are realized,it is a distributed wireless sensing network.Wireless sensor networks offers many features such as a wide range,high dynamics,data-centricity,and high integration.Based on computer technology,wireless communication technology and hardware systems,the rapid development of wireless sensor networks has led to the development from basic physical quantities such as temperature,humidity,pressure and motion status to widely used in smart homes,environmental monitoring,and medical care,as well as military operations and other fields.In medical care,the application of wireless sensor networks is composed of several sensor nodes with a certain network topology,sensor nodes are placed in different parts of the human body to achieve different functions(such as pulse,ECG and blood pressure detection).After the information is detected,the wireless transmission among the post-sensor node and the portable device and the telemedicine center are realized,finish the monitoring of the vital signs of the human body,and provide guarantee for the life of the monitored person.In addition,the sensor nodes are dense and randomly distributed,which is suitable for monitoring the battlefield environment.The information is transmitted to the command and control center by means of wireless communication,and the data fusion and analysis are realized in the command center to realize the perception of the battlefield environment.In the agricultural field,the sensor network can monitor the growth of crops,reduce the use of manpower and material resources,and effectively improve resource utilization.In addition,the use of wireless sensor networks can achieve real-time monitoring of road conditions,dredge traffic,and protect the environment and roads.Therefore,it is urgently needed for the wireless sensor network to conduct in-depth research in various fields such as medical care,military,agriculture,transportation and so on,to get rid of the limitation for monitoring distance of traditional wired communication and realize remote monitoring of the monitored area,which improves the monitoring efficiency greatly.The model studied in this paper can be applied in many of the above fields and has important practical significance.In wireless networks,how to prolong the lifetime is always an important assessment indicator and technical bottleneck.Moreover,the energy consumption problem has become a key technical difficulty in extending the network lifetime,how to realize the self-power supply of wireless networks and reduce the occurrence of the outage when the energy is insufficient in traditional wireless network is critical.Sensor nodes in traditional wireless sensor networks are mostly battery powered,The problem of short network life cycle remains to be resolved.Obtaining energy from RF signals has become a new type of energy acquisition.The application of this technology can greatly improve the sustainability of the network.At the same time,information and energy simultaneous transmission technology can be developed.In existing researches,the information transmission between nodes is consistent with the direction of energy transmission,and the application scenarios are limited.In addition,when the channel condition is bad,the transmission of information will not only cause energy waste,but also the system performance cannot be guaranteed.In view of the above problems,this paper studies the energy accumulation and relay cooperation of sensor nodes in wireless sensor networks.The main ideas are as follows: Firstly,the information and energy bidirectional transmission system model of wireless network is constructed,and the energy collection model between nodes,information transmission and reception models are analyzed.Secondly,based on the time-switching protocol of simultaneous wireless information and power transmission,the energy accumulation algorithm is proposed,the energy of sensor nodes are analyze,and the theoretical derivation and actual analysis of the proposed protocol are carried out.Finally,the proposed energy accumulation algorithm is simulated and verified to optimize the system performance.The main work of this paper is as follows:First,the information and energy bidirectional transmission system model of the wireless sensor network is constructed.The three-node transmission model is adopted,and the nodes are on the same straight line.Based on the transmission model,the information transmission model between sensor nodes in the model is studied,and the channel model during information transmission is analyzed.Second,aiming at the time allocation and power allocation relay transmission protocols in wireless sensor networks,the energy cooperative communication in wireless sensor networks is analyzed firstly.Then a new signal receiving mechanism is designed to transmit energy and information simultaneously.Third,based on the time allocation protocol,two energy accumulation protocols based on bidirectional transmission model are proposed.The energy of the sensor nodes are analyzed to obtain the system throughput.The traversal method is used to optimize the system performance.Fourth,this paper analyzes the superiority of the energy accumulation protocol,and simulates the two energy accumulation protocols respectively.According to the simulation results,the different scenarios applied by the two protocols are studied to verify the feasibility of the protocol.The research solution above provides a new solution to solve the energy waste caused by poor channel in wireless sensor networks.The proposed protocols reduce the outage probability and improve the system throughput effectively,extend the application scenario of the wireless sensor network,it has practical significance.