极化体表通信在医用体域网中的建模与应用研究

项目名称： 极化体表通信在医用体域网中的建模与应用研究

项目编号： No.81460275

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 医药、卫生

项目作者： 柳凌峰

作者单位： 华东交通大学

项目金额： 47万元

中文摘要： 无线体域网与穿戴式医疗传感器技术可为移动医疗终端用户提供低功耗，小型化，分布式的多体征信号联合检测与传输服务，将极大提升现有移动医疗设备的检测能力。体表通信作为无线体域网的主要通信机制，其传播信道受到来自人体与体表天线的近场时变电磁影响，在时间，空间，与极化分布上表现出独特的近场传播与动态特征。准确描述极化体表信道，是在低功耗系统设计中持续优化体表通信稳定性的关键。本项目将在典型医疗场景与人体运动模式下，针对900 MHz，2.4 GHz与5GHz频段的窄带同极化与交叉极化体表信道进行模拟，测量与建模。研究近场传播信道极化矩阵描述方法，探索极化体表信道的物理机制，分析人体与天线动态耦合效应，建立基于关键体征区域的体表信道统计模型。通过体表信道动态统计特性和体表天线辐射特性的准确描述，项目将进一步评估与优化现有低功耗通信协议在低速体表通信场景下的性能，实现传感设备持持续小型化的目标。

中文关键词： 无线体域网；移动医疗；近场传播；极化体表通信；动态人体散射效应

英文摘要： The emerging of wireless body area newtorks (WBANs) and wearable medical sensor technologies is bringing low-powered, minaturized, and distributed multi-sensing physiological signal detection and tranmssion services to the end-users of mobile health (mHealth) systems. These technologies will greatly enhance the capability of current stand-alone mobile medical devices. The propagation channels of on-body communications, being the primary communication mechanism in WBANs, are impacted by the time-variant interferences from both the body scattering and antenna coupling effects, which in turn form distinct near-field propagation and dynamic fading/shadowing characteristics of on-body channels over time, space, and polarizations. Consequently, proper description and modeling on the polarized on-body channels is the key to continuosly optimize the stability of on-body communications in low-power mode system design. In this project, our work will be focused on the simulating, measuring, and modeling of the narrowband co-polarized and cross-polarized on-body channels at 900 MHz, 2.4 GHz, and 5 GHz. The polarization matrix characterization of near-field propagation channels will be studied. The physical mechanism of polarized on-body channels will be modeled. The dynamic body-antenna coupling effects will also be analyzed. Statistical channel models will be proposed on critical regions of the body. With a precise statistical model of dynamic polarized on-body channels and a better description of on-body antenna radiation patterns, the research will further evaluate and optimize the performance of current low-power communication protocols in low-speed on-body communication scenarios, and will further realize a continuous miniaturization design of wearable medical sensors.

英文关键词： WBAN;mHealth;near-field propagation;polarized on-body communication;dynamic body scattering