Scalable on-body pathloss models based on surface wave propagation for wireless body area networks

如今，用于身体穿戴应用的相互通信的无线通信技术的使用正在迅速增加。这些应用范围从安全技术、多媒体产品和遥测运动应用到医疗保健系统。特别是这些应用程序的组合提供了多种可能的实现方式。随着可穿戴设备的不断小型化，天线与用户之间的相互作用变得更加严重。沿着的是传统的自由空间天线理论在描述体上表面波的激发方面的不足，这导致迄今为止对这种体中心系统的发展的认识不足。因此，本研究建议的目的是推导出可扩展的，物理激励的路径损耗模型的无线体域网，可用于开发优化的设计策略。模型应与身体通道的基本几何和介电参数密切相关，使其可扩展。对应于申请人的前述研究活动，将使用开发的天线去嵌入方法来分离天线和信道特性。在此基础上，路径损耗模型将通过地波传播理论（例如，从陆地和海军无线通信）的适应来导出。通过数值模拟和实际测量，验证了每一步的改进，使模型更接近实际。最后，计算了不同体上传播链路的物理路径损耗模型。这里，底层建模过程包含基本几何特征、频率、体上信道的电介质组织值和天线集成设置本身。通过这些显式参数的变化，该模型可以适用于广泛的一类特定的传播场景。

Nowadays the use of wireless communication technologies for the intercommunication of body-worn applications is increasing rapidly. These applications range from security technologies, multimedia products and telemetric sports applications to healthcare systems. Especially the combination of these applications offers a wide variation of possible realizations. In accordance with the ongoing miniaturization of wearable devices the interaction between the antenna and the user becomes more severe. Along with the lack of the traditional free-space antenna theory in describing the excitation of on-body surface waves, this leads to insufficient insight in the development of such body centric systems so far. Therefore, the aim of this research proposal is a derivation of scalable, physically motivated pathloss models for wireless body area networks that can later be used to develop optimized design strategies. The models shall be closely connected to basic geometric and dielectric parameters of the on-body channel, making it scalable. Corresponding to the preceding research activities of the applicant a developed antenna de-embedding approach will be used to separate antenna and channel characteristic. Based on this, the pathloss models will be derived by the adaption of the ground wave propagation theory (e.g. from terrestrial and naval wireless communications). Here, each modification step towards a more realistic model is verified by numerical simulations and practical measurements.Finally, the physically motivated pathloss models are calculated for different on-body propagation links. Here, the underlying modeling process contains the basic geometric features, the frequency, the dielectric tissue values of the on-body channel and the antenna integration setup itself. By variation of these explicit parameters the model can be adapted to a wide class of specific propagation scenarios.