tailieunhanh - Báo cáo hóa học: " Research Article Ultra-Wideband Channel Modeling for Intravehicle Environment"

Research Article Ultra-Wideband Channel Modeling for Intravehicle Environment | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 806209 12 pages doi 2009 806209 Research Article Ultra-Wideband Channel Modeling for Intravehicle Environment Weihong Niu 1 Jia Li 1 and Timothy Talty2 1 Department of Electrical and Computer Engineering Oakland University Rochester MI 48309 USA 2ECI Laboratory General Motors Research and Development Center Warren MI 48090 USA Correspondence should be addressed to Weihong Niu wniu@ Received 7 May 2008 Revised 10 November 2008 Accepted 16 January 2009 Recommended by Weidong Xiang With its fine immunity to multipath fading ultra-wideband UWB is considered to be a potential technique in constructing intravehicle wireless sensor networks. In the UWB literature extensive measuring and modeling work have been done for indoor or outdoor propagation but very few measurements were performed in intravehicle environments. This paper reports our effort in measuring and modeling the UWB propagation channel in commercial vehicle environment. In our experiment channel sounding is performed in time domain for two environments. In one environment the transmitting and the receiving antennas are put beneath the chassis. In another environment both antennas are located inside the engine compartment. It is observed that paths arrive in clusters in the latter environment but such clustering phenomenon does not exist in the former case. Different multipath models are used to describe the two different propagation channels. For the engine compartment environment we describe the multipath propagation with the classical S-V model. And for the chassis environment the channel impulse response is just represented as the sum of multiple paths. Observation reveals that the power delay profile PDP in this environment does not start with a sharp maximum but has a rising edge. A modified S-V PDP model is used to account for this rising edge. Based on the analysis of the