WSEAS Transactions on Signal Processing
Print ISSN: 1790-5052, E-ISSN: 2224-3488
Volume 10, 2014
A Path Loss Calculation Scheme for Highway ETC Charging Signal Propagation
Authors: , , , , ,
Abstract: Nowadays, Electronic Toll Collection (ETC) technology is widely used in many countries for highway toll charging. Actually, the ETC charging process can be treated as wireless communication between On Board Unit(OBU: in the vehicle side) and Road Side Unit(RSU: in the ETC exclusive lane side). After the communication link is built between the OBU and RSU, the highway toll gate will be open automatically, and meanwhile, the toll will be charged from drivers’ bank accounts. This process asks for higher accuracy of the propagated signal. For path loss calculation of the charging signal, many previous researches only considered the direct path. However, in our realistic architectures of the highway toll stations, the signal propagation between the OBU and RSU is made up of several paths. Not only the direct path, but also many un-direct paths. Therefore, it is necessary to consider the realistic architectures of the toll stations, and give out a more feasible calculation method. This paper proposed a more feasible path loss calculation scheme for the ETC charging signal, which has considered the reflections impacts from the roof and ground of the station. By simulation, our method indicates that, the reflection effects from the roof and ground cannot be ignored in the realistic charging process. This paper also gives two advices for reducing the reflection impacts: 1) increase the reflection coefficients of roof and ground, which can be used to reduce the path loss brought by reflections; 2)the best suitable distance between the RSU and OBU is about 3m 5m, within this distance, the signal path loss is much lower than other distance ranges.
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Pages: 301-308
WSEAS Transactions on Signal Processing, ISSN / E-ISSN: 1790-5052 / 2224-3488, Volume 10, 2014, Art. #30