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Underwater Acoustic Communication Using Nonlinear Chirp Signal

비선형 chirp 신호를 이용한 수중음향통신

Chang-Eun Lee1
,
Ki-Man Kim1*
,
Woo-Sik Kim2
,
Seung-Yong Chun2
,
Sang-Kook Lee2
이 창은1
,
김 기만1*
,
김 우식2
,
천 승용2
,
이 상국2
1Korea Maritime and Ocean University
1한국해양대학교 전파공학과
2국방과학연구소
*교신저자. *Corresponding Author. 
31 July 2014. pp. 255-261
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Abstract

This paper presents an underwater acoustic communication with nonlinear chirp modulation. The information is carried by the carrier amplitude, frequency or phase in the most common underwater acoustic communications. However, the proposed method includes the information within frequency variation of carrier wave for a symbol. Especially, as carrier wave the hyperbolic frequency modulated signal, one of the nonlinear chirp signal, is used and it is robust in the Doppler channel. The proposed method was analyzed and compared to conventional method by simulation. When the doppler shift existed, the error probability of the proposed method is reduced by 5~12 % than conventional method with linear frequency modulated signal. Sea trial was performed to analyze the performance of the proposed method.

Keywords
Underwater acoustic communication
Multipath propagation
Doppler shift
Linear frequency modulation
Nonlinear chirp
Hyperbolic frequency modulation

본 논문에서는 수중음향통신에서 비선형 chirp 변조 신호를 사용하는 방법을 제안한다. 과거 대부분의 수중음향통신에서는 반송파의 크기, 주파수 또는 위상에 정보를 실었다. 이에 반해 제안된 방법은 심볼 내에서 반송파의 주파수 변화율에 정보를 포함하게 된다. 특히, 반송파로 비선형 chirp 신호의 일종인 하이퍼볼릭 주파수 변조 신호를 사용하는 경우, 도플러 채널에서 강한 특성을 가진다. 제안된 방법은 시뮬레이션을 통해 기존 방법과 비교 및 분석하였다. 제안된 방식과 선형 주파수 변조 신호를 갖는 기존 방식을 비교하였을 때 도플러 편이가 있는 경우 제안된 방법의 오차 확률이 평균 5~12% 감소하는 것을 확인할 수 있었다. 또한 제안된 방법의 성능을 분석하기 위해 해상실험이 수행되었다.

키워드
수중음향통신
다중경로 전달
도플러 편이
선형 주파수 변조
비선형 chirp
하이퍼볼릭 주파수 변조
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 33
  • No :4
  • Pages :255-261
  • Received Date : 2014-02-26
  • Revised Date : 2014-04-22
  • Accepted Date : 2014-04-28
  • DOI :https://doi.org/10.7776/ASK.2014.33.4.255
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