Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TD3
Session:
Number:3TD3-5
Delay Profile Model in 700MHz Band for Road to Vehicle and Vehicle to Vehicle Communications
Hisato IWAI, Ippei SUGAE,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Research and development on ITS (Intelligent Transport System) has been advanced for recent years. As the radio spectrum of the ITS wireless systems, the 5.8GHz band has mainly been used up to now in Japan. On the other hand, it was recently decided that 700MHz is to be allocated for ITS along with the re-arrangement of the UHF spectrum due to the digitalization of the analogue television broadcasting services [1]. One of the reason why the lower frequency is preferred in ITS is the smaller diffraction loss. It is effective to enhance the service coverage particularly where the two communication vehicles are in non line-of-sight situation such as over-the-intersection. The development of a new ITS system in the new frequency band is now being advanced in Japan [2]. In the development and the standardization, it is necessary to show the system achieves sufficient communication performance in the environment where it is actually used. In general, the performance is evaluated by computer simulations. To realize precise evaluation, propagation models, by which the actual propagation path of the wireless system is appropriately characterized, are indispensable. For link level simulations, a delay profile model is particularly important. In the standardization of the wireless system for ITS of the 700MHz band, propagation measurement was firstly carried out. In this paper, the delay profile model for ITS in the 700MHz band based on the measured data is presented. Numerous measurements were carried out in the campaign by changing various parameters. In addition to the delay characteristics, the propagation loss is also measured in the experiment. Among them, we focus on the delay model and some concrete examples of the established models are shown [3]. A detailed analysis of the statistical propagation characteristics such as the dependence on the environments, etc. is a remaining subject for the future study.