Optical wireless sensor network system using corner cube retroreflectors

Shota Teramoto, Tomoaki Ohtsuki

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

We analyze an optical wireless sensor network system that uses corner cube retroreflectors (CCRs). A CCR consists of three flat mirrors in a concave configuration. When a light beam enters the CCR, it bounces off each of the three mirrors, and is reflected back parallel to the direction it entered. A CCR can send information to the base station by modulating the reflected beam by vibrating the CCR or interrupting the light path; the most suitable transmission format is on-off keying (OOK). The CCR is attractive in many optical communication applications because it is small, easy to operate, and has low power consumption. This paper examines two signal decision schemes for use at the base station: collective decision and majority decision. In collective decision, all optical signals detected by the sensors are received by one photodetector (PD), and its output is subjected to hard decision. In majority decision, the outputs of the PDs associated with the sensors are subjected to hard detection, and the final data is decided by majority decision. We show that increasing the number of sensors improves the bit error rate (BER). We also show that when the transmitted optical power is sufficiently large, BER depends on sensor accuracy. We confirm that collective decision yields lower BERs than majority decision.

Original languageEnglish
Pages (from-to)39-44
Number of pages6
JournalEurasip Journal on Wireless Communications and Networking
Issue number1
DOIs
Publication statusPublished - 2005 Mar 15
Externally publishedYes

Keywords

  • Collective decision
  • Corner cube retroreflector
  • Majority decision
  • Optical wireless sensor network

ASJC Scopus subject areas

  • Signal Processing
  • Computer Science Applications
  • Computer Networks and Communications

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