Design of infrared electronic-toll-collection systems with extended communication areas and performance of data transmission

Wern Yarng Shieh*, Chen Chien Hsu, Shen Lung Tung, Po Wen Lu, Ti Ho Wang, Shyang Lih Chang

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

23 引文 斯高帕斯(Scopus)

摘要

Based on our previous works in the design of an infrared emitter for electronic-toll-collection (ETC) applications, we use the unidirectional cosinen functions to approximate the irregular radiation pattern for typical infrared low-cost commercial light-emitting diodes (LEDs) with a half-intensity angle Φ1/2 = 10°. With the aid of this approximation, the main characteristics of the performance of an infrared ETC system utilizing this type of LED as the emitter can be investigated based on the received signal strength of the system. For onoff keying, a simple model connecting the received signal strength and the bit error rate (BER) of the system is further established. From the calculated or the measured received signal strength of the system, it is not difficult to estimate the system performance in terms of the BER by this simple model. Roughly speaking, for a typical setting of the circuit parameters and a typical uplink and downlink data-transmission protocol, the data transmission can be very successful in terms of a very low BER if the received signal strength is 1.3 times stronger than the signal strength received at the communication boundary. The emitter presented in this paper is able to produce a relatively extended communication area in the vehicle-traveling direction, resulting in longer communication time interval for the data transmission between the onboard unit (OBU) and the roadside unit (RSU) than conventional emitters. Furthermore, the design presented in this paper is validated by experimental measurement to demonstrate its effectiveness.

原文英語
文章編號5535181
頁(從 - 到)25-35
頁數11
期刊IEEE Transactions on Intelligent Transportation Systems
12
發行號1
DOIs
出版狀態已發佈 - 2011 三月

ASJC Scopus subject areas

  • 汽車工程
  • 機械工業
  • 電腦科學應用

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