无线体域网体表信道模型研究进展

Progresses in on-body channel models for wireless body area networks

体表信道是无线体域网体表节点间建立有效可靠无线连接的物理基础.由于体表节点发射功率和功耗有着严格的限制,且体域网具有以人为中心的特点,使得体表信道易受到人体组织电磁特性、人体运动、应用环境和收发天线等因素的影响,极大地增加了信道模型研究的复杂性.主要针对单一路径损耗、混合路径损耗、小尺度衰落、基于场景以及适用于超宽带的5种不同体表信道模型的建立发展、数学表达和应用特点几方面,对目前无线体域网体表信道模型的研究进展作一综述.

On-body communication channels are a physical basis for the establishment of an effective and reliable wireless link between on-body nodes in wireless body area networks （WBANs）.Due to normally strict limitations in transmit power and power consumptions of on-body nodes as well as the human-centered characteristics of WBANs,on-body channels are prone to be affected by the electromagnetic properties of human tissues,human movements,application environments and transceiver antennas,which increase greatly the complexity of the research on channel models.The paper discusses the developments,mathematical expressions and application characteristics of five types of on-body channel models,such as the simple path loss model,the hybrid path loss model,the small-scale fading model,the scenario-based model and the ultra-wideband model,and reviews the current progress on the modeling on-body channels.