无线体域网信道特性研究

Research on the Channel Characteristics of WBAN

无线体域网(WBAN)包含一系列低功耗、微型化、侵入式或非侵入式无线传感器节点,通过短距离无线通信技术实现与外界的通信,提供医疗保健、消费电子、个人娱乐等多项服务。由于WBAN应用于人体,WBAN信道的传播特性与其他传统的无线信道特性有着显著的不同。本文从频点、环境和人体状态3个方面详细研究了WBAN的信道特性。UWB频段采用了冲激响应模型,而路径损耗模型适用于所有频段;在不同环境下,多径效应是影响信号在体外空间传播的主要因素;此外,天线的位置和人体的运动状态,也是WBAN信道建模和仿真时考虑的关键因素。

Wireless body area network（WBAN） contains a series of low-power,miniaturized,invasive/non-invasive wireless sensor nodes,using short-range wireless communication technology to connect with the outside world,and providing a variety of services,such as health care,consumer electronics and personal entertainment.Because WBAN is used for human body,the channel characteristics differ significantly with other traditional wireless channels.In this paper,the propagation characteristics of WBAN channel are studied from three aspects：frequencies,environments and human state.In UWB frequency band,the impulse response model is proposed,while the path loss model is applicable to all frequency bands.In different environments,multi-path effect is the major factor affecting signal propagating in vitro space.Moreover,the positions of antenna and the human movement state are also key factors when modeling and simulating of WBAN channel characteristics are considered.