无线体域网信道特性研究

doi:10.3969/j.issn.1000-0801.2011.03.020

摘要/Abstract

摘要：

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。

关键词: WBAN, 信道特性, 频点, 环境因素, 人体状态

Abstract:

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.

Key words: WBAN, channel characteristic, frequency, environment, human state

许波,贺鹏飞,段嗣妍. 无线体域网信道特性研究[J]. 电信科学, 2011, 27(3): 78-84.

Bo Xu,Pengfei He,Siyan Duan. Research on the Channel Characteristics of WBAN[J]. Telecommunications Science, 2011, 27(3): 78-84.

图/表 9

图1

图2

表1

表2

表3

UWB频段冲激响应信道模型的信道参数"

信道描述	体表—体表				体表—体外（发射天线位于身体前方）
冲击响应模型	γ₀dB]	Γ	δ_s	t_l（¹/_λ）[ns]	$L \bar{(L)}$	Γ[ns]	k[dB]	δ_βdB]
	-4.60	59.7	5.02	1.85	38.1	44.6346	5.111	7.30

表3

图3

图4

图5

图6

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路径损耗模型	频段			频段
路径损耗模型	频段	608～614 MHz	950～956 MHz	2.4～2.5 GHz	UWB频段（3.1～10.6 GHz）
a		17.2	28.8	29.3	34.1
b		1.61	-23.5	-16.8	-31.4
δ_N（dB）		6.96	11.7	6.89	4.85

路径损耗模型	信道描述	体内—体内		体内—体表
路径损耗模型	信道描述	深组织处	浅组织处	深组织处	浅组织处
d₀（mm）		50	50	50	50
PL₀（dB）		35.04	40.94	47.14	49.81
n		6.26	4.99	4.26	4.22
δ_s（dB）		8.18	9.05	7.85	6.81

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