基于转发节点的无线体域网动态信道研究

无线体域网(wireless body area network,WBAN)的信道特性对于传输速率、传输质量以及连接鲁棒性有很大影响.当前的研究主要是假设人体处于理想状态(静止状态)时的信道特性,这与实际情况中的动态信道不相符合,理想状态下的信道特性也不能反映人体真实的信道特性.为了使WBAN的研究能够更好地应用于实践,建立了步行和跑步两态三维成年男性的人体动态模型,在人体不同部位部署传感器节点模拟无线信道,并在适当部位引入转发节点,在2.4 GHz时计算对比不加转发节点和加入转发节点对动态信道特性的影响.仿真结果显示,人体姿势变化对无线信道特性有很大影响,姿势变化幅度越大对信道特性的影响越大;基于转发节点的信道路径损耗要小于未进行转发的信道路径损耗,合理部署转发节点的位置能极大改善人体处于动态环境下的信道特性,提高通信可靠性.

Dynamic body communication channels base-relay nodes for wireless body area networks

The channel of wireless body area network has a great effect on the transmission rate, transmission quality and reliability of the network. At present, the research of channel characteristic of body area network mainly focuses on the static channel, the characteristics of static channel in theoretical research and practical application is not consistent, the static channel does not reflect the characteristics of real channel. In order to make the research of WBAN can be better applied in practice, the human body model of walking and running is established in this paper, and we deployed multiple sensor nodes on the three-dimensional model and introduced the relay nodes in the appropriate part. The channel path loss of the two models under the surface is calculated at 2.4GHz. The results show that, the change of body posture has a great influence on the performance of the wireless channel, the greater the change of posture is, the greater impact on the channel characteristics is. The channel path loss based on rely nodes is less than the channel path loss not based on rely nodes. The appropriate relay nodes position can greatly improve channel characteristics under dynamic environment and the reliability of communication.