전자공학회논문지 (Journal of the Institute of Electronics and Information Engineers)

대한전자공학회 (The Institute of Electronics and Information Engineers)
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시변 수중 음향 채널에서 코드 분할 다중 접속 방식의 폐루프 전력 제어 기법

Closed-Loop Power Control for Code Division Multiple Access in Time-Varying Underwater Acoustic Channel

  • 서보민 (경북대학교 대학원 전자공학부) ;
  • 조호신 (경북대학교 대학원 전자공학부)
  • Seo, Bo-Min (School of Electronics Engineering, Kyungpook National University) ;
  • Cho, Ho-Shin (School of Electronics Engineering, Kyungpook National University)
  • 투고 : 2015.11.04
  • 심사 : 2015.11.25
  • 발행 : 2015.12.25
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초록

코드 분할 다중 접속 기법은 주파수 선택적 페이딩과 다중 경로 페이딩에 강인할 뿐만 아니라 주파수 재사용 효율이 좋으므로 수중 환경에서의 유망한 매체 접속 제어 기법으로 많은 연구가 진행되고 있다. 본 논문에서는 시변 수중 음향 채널에서 코드 분할 다중 접속 방식의 폐루프 전력 제어 기법을 설계한다. 본 기법에서는 싱크 노드가 센서 노드로부터 수신한 패킷의 수신 전력을 바탕으로 시변하는 상향 링크를 분석하고 각 센서 노드의 경로 손실의 크기를 포함한 제어 패킷을 센서 노드로 전송한다. 센서 노드는 이를 바탕으로 전력 제어를 수행함으로써 시변 수중 채널에서 효율적인 전력 제어가 가능하다.

Code division multiple access (CDMA) is one of the promising medium access control scheme for underwater acoustic sensor networks due to its beneficial features such as robustness against frequency-selective fading and high frequency-reuse efficiency. In this paper, we design a closed-loop power control scheme for the underwater CDMA, to adapt time-varying acoustic channel. In the proposed scheme, sink node sends to sensor nodes the associated path loss which is acquired by uplink-channel analysis based on received packets from the sensor nodes. Then, sensor nodes adjust their transmission power in an adaptive manner to time-varying underwater acoustic channel, according to the informations sent by the sink node.

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참고문헌

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