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