Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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A Study on a Low Power Underwater Communication Modem for Implementation of Underwater Sensor Networks

수중 센서 네트워크를 위한 저전력 수중 통신 모뎀 연구

  • Choi, Yong-Woo (Department of Electrical and Computer Engineering, Pusan National University) ;
  • Hwang, Jun Hyeok (Department of Electrical and Computer Engineering, Pusan National University) ;
  • Park, Dong Chan (Department of Electrical and Computer Engineering, Pusan National University) ;
  • Kim, Suk Chan (Department of Electrical and Computer Engineering, Pusan National University)
  • Received : 2014.11.17
  • Accepted : 2015.02.03
  • Published : 2015.03.31
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Abstract

Recently many countries are researching actively underwater sensor networks for securing ocean resources and changes of ocean environment in all over the world. Current the commercial modem are not suitable because it has characteristics of long distance, higher price, larger power consumption with the special object mainly. In this paper, a low power and compact underwater communication modem which is suitable for underwater sensor networks is implemented. It is comprised by using a simple analog circuit for non-coherent BFSK modulation method, ultra low power MCU and orthogonal codes with a less operation and a simple implementation. It was experimented an underwater communication using our modem in a water tank and open sea farms. It communicates fewer than $10^{-4}$ bit error rate.

최근 세계 각국에서 해양자원을 확보하고 해양환경 변화를 연구하기 위해 수중 센서 네트워크 관련 연구를 활발히 진행하고 있다. 현재 사용 중인 상용모뎀은 주로 특수목적용으로 장거리, 고가, 큰 소모전력, 대형 등의 특징을 지녀수중 센서 네트워크 구현에는 적합하지 않다. 이 논문에서는 비동기식 BFSK (Binary Frequency Shift Keying) 변조방식에 따른 간단한 수신회로, 초 저전력의 MCU (Micro Control Unit), 비교적 적은 연산량과 간단한 구현으로 동기 및 수신성능을 높이는 직교부호를 사용하여 수중 센서 네트워크에 적합한 소형 저전력 수중통신 모뎀을 구현한다. 다중경로가 심한 수조 및 외해 양식장에서 성능평가를 수행하여 $10^{-4}$ 미만의 비트오류율로 통신하는 것을 보인다.

Keywords

References

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