Experiment on Synchronous Timing Signal Detection from ISDB-T Terrestrial Digital TV Signal with Application to Autonomous Distributed ITS-IVC Network

Yoshio KARASAWA  Taichi KUMAGAI  Atsushi TAKEMOTO  Takeo FUJII  Kenji ITO  Noriyoshi SUZUKI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E92-B   No.1   pp.296-305
Publication Date: 2009/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.296
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Integrated Systems for Communications
Keyword: 
ITS,  inter-vehicle communication (IVC),  ad-hoc network,  synchronization,  OFDM,  guard interval,  

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Summary: 
A novel timing synchronizing scheme is proposed for use in inter-vehicle communication (IVC) with an autonomous distributed intelligent transport system (ITS). The scheme determines the timing of packet signal transmission in the IVC network and employs the guard interval (GI) timing in the orthogonal frequency divisional multiplexing (OFDM) signal currently used for terrestrial broadcasts in the Japanese digital television system (ISDB-T). This signal is used because it is expected that the automotive market will demand the capability for cars to receive terrestrial digital TV broadcasts in the near future. The use of broadcasts by automobiles presupposes that the on-board receivers are capable of accurately detecting the GI timing data in an extremely low carrier-to-noise ratio (CNR) condition regardless of a severe multipath environment which will introduce broad scatter in signal arrival times. Therefore, we analyzed actual broadcast signals received in a moving vehicle in a field experiment and showed that the GI timing signal is detected with the desired accuracy even in the case of extremely low-CNR environments. Some considerations were also given about how to use these findings.