Ultra Wideband Impulse Radio Transmission Waveform Analysis with Human Body for Wireless Body Area Network

摘要

The ultra wideband impulse radio (UWB-IR) is expected to applied to wireless personal area network (WPAN) and the ranging in the home and the office. The shadowing effect of LOS path due to human body has the big effect in the indoor environment. This paper discusses the influence of shadowing due to the human body on the UWB transmission waveform over the frequency bandwidth of 3 GHz to 11 GHz is investigated. The channel measured in the anechoic chamber to avoid the environmental effects. However, the characteristics of the transmitter and receiver antennas are included in the channel. In the experiment, a handmade biconical antenna and the commercial, meander line antenna developed by Skycross, are used at the transmitter and receiver, respectively. From the experimental results are used to evaluate the transmission gain based on the extended Friis' transmission formula and the matched filter is considered at the receiver side to maximize the SNR for evaluation. This technique gives very accurate results and is very useful for the design and evaluation of UWB impulse radio transmission systems, especially for the evaluation of waveform distortion effects.