| The Wireless Body Area Network emerged with the needs of society and it has been an important research area of wireless sensor networks,which is closely related to everyone's life.The wireless body area network is made up the advanced technologies such as sensors,wearables,wireless communications and big data cloud technology,and it has attracted widespread attention.It has been a hot research that can't be ignored now.It has broad application prospects in the fields of health care,military operations,and daily life.There is still much room for the development of wireless body area networks.Through remote monitoring of various indicators of the human body,it has played a role of prevention and protection for human health.However,there are still many problems and challenges in theoretical research and practical application,so more and more scholars have invested in the research of wireless body area networks.The different information is collected through various sensors distributed on the human body in the wireless body area network,the information is transmitted to the mobile device carried by the human body through the wireless communication technology,and then we analyze the data and information to determine the physical health status of the subject.The transmission of energy and information is restricted by the energy availability of wireless body area networks.The effectiveness of transmission is reduced by the volume and loss of various sensors.The transmission time is affected by the movement of the human body.Therefore,the operation of wireless body area networks is proposed.For higher requirements,it makes sense to build an effective transmission system.At present,scholars at home and abroad have studied the point-to-point energy and information of wireless body area networks at the one-way and two-way transmission,resource allocation for energy and information transmission,and protocols for wireless body area network transmission,andthere are many important results.However,research on transmission efficiency and energy waste is still lacking.Therefore,it is of great significance that the research on the transmission efficiency and limited energy of wireless body area networks.In the wireless body area network,it is an important technical difficulty and an important challenge to how to improve the energy and information transmission efficiency.Among them,the energy consumption is the key conditions to improve the transmission efficiency.It has been an inevitable trend in the development of wireless body area networks to research the transmission efficiency and energy collection technology.The battery is the main way of traditional wireless body area network energy collection.The battery has the disadvantages of frequent replacement and large size.Therefore,obtaining energy from radio frequency signals is an avant-garde energy collection method right now,so that one-way and two-way transmission of energy and information technology have been proposed.The low efficiency of point-to-point energy information transmission is existed in the existing wireless body area network,and the waste of energy caused when the transmission channel state is not good,which cannot guarantee the normal transmission of the system.Based on the above problems,a multi-point multi-antenna energy and information transmission model based on wireless body area network is proposed in this paper.The main ideas are as follows: First,a multi-antenna and multi-point energy and information transmission model for a wireless body area network is constructed,and the delay-limited and delay-tolerant transmission modes are analyzed.Secondly,based on the characteristics of the wireless body area network,beam forming,wearable antenna,etc.,the average throughput of the system is analyzed,and the accuracy and asymptotic throughput proposed are analyzed theoretically and practically.Finally,the throughput expressions of the two delayed transmission modes and the throughput-optimal energy collection time expression under high signal-to-noise ratio conditions are simulated,and the performance of the system is analyzed and verified.The main work of this article is as follows:First,we analyze the architecture and application scenarios of the wireless body area network,and we build a model,which is an energy and information bidirectional transmission in WBAN.The multi-point transmission model is adopted.AP is equipped with multiple antennas,and multiple sensors are equipped with single antennas.It providesnew ideas for solving the energy consumption problem and transmission efficiency of wireless body area networks.Second,based on the two models of delay-limited and delay-tolerant in wireless body area network,the average throughput of energy beamforming in multi-antenna and multi-point WBAN is studied,and the closed-form expression and the asymptotic expression of the average throughput are derived.Third,we obtain the best downlink energy collection time for high signal-to-noise ratio.In addition,we study the impact of various parameters(such as transmit power,energy collection time,number of sensors,and number of antennas)on the system throughput.Fourth,we analyze the theoretical derivation and simulation verification of the proposed throughput performance,with the goal of maximizing system throughput,we summarize the effectiveness of energy and information transmission of the multi-antenna and multi-point wireless body area network under delay-limited and delay-tolerant transmission modes.In the above research,a comprehensive theoretical analysis and simulation demonstration of the energy and information transmission of the proposed wireless body area network was conducted to solve the problems of energy limitation and transmission efficiency of the wireless body area network.Through the proposed transmission mode,the average throughput of the system and the reliability of the system transmission are improved.It fills some foundation for the further development of the wireless body area network and it has practical significance. |
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