The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Performance Analysis on Code-Division Multiple Access in Underwater Acoustic Sensor Network

수중 음향 센서 망에서의 코드 분할 다중 접속 기법에 대한 성능 해석

  • 서보민 (경북대학교 전자전기컴퓨터공학부 이동통신 연구실) ;
  • 조호신 (경북대학교)
  • Received : 2010.03.25
  • Accepted : 2010.08.09
  • Published : 2010.09.30
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Abstract

Acoustic signal, which is a main carrier of underwater communication, attenuates along the traveled path heavily depending on the frequency as well as inter-node distance. In addition, since it has a long propagation delay, the conventional medium access control (MAC) schemes requiring complex signaling procedures and accordingly heavy overhead messages would not be appropriate in underwater communications. In this paper, we propose a code division multiple access (CDMA) scheme as a solution for MAC of underwater communication and evaluate the performance. A hierarchical data-gathering tree topology is considered and a staggered wake-up pattern is employed for the purpose of energy saving. As a performance measure, the data rate at each level of hierarchical topology is derived.

수중 통신에서 사용되는 음향 신호의 감쇠는 노드 사이의 거리는 물론 사용 주파수 대역에도 크게 영향을 받는다. 또한 음향 신호는 긴 전송 지연을 가지므로 복잡한 절차와 많은 제어 메시지를 필요로 하는 매체 접속 기법은 사용하기에 적합하지 않다. 본 논문은 이처럼 열악한 수중 환경에서 코드 분할 다중 접속 기법의 적용 방법을 제시하고 그 성능을 분석한다. 수중 음향 센서망 구조는 데이터 수집형 트리 구조를 가정하며 에너지 절약을 위해 트리 구조에서 계층간 엇갈림 깨어남 패턴을 사용한다. 성능 분석을 위해 다양한 사용 주파수 대역에서 계층별 데이터 전송률을 수학적으로 도출한다.

Keywords

References

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