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2014 Vol.33, Issue 6 Preview Page
Underwater Acoustic Communication of FH-MFSK Method with Multiple Orthogonal Properties

다중 직교 특성을 갖는 FH-MFSK 방식의 수중음향통신

Hyeung-Woo Lee1
,
Ki-Man Kim1*
,
Yun-Joon Son2
,
Woo-Sik Kim3
,
Seung-Yong Chun3
,
Sang-Kook Lee3
이 형우1
,
김 기만1*
,
손 윤준2
,
김 우식3
,
천 승용3
,
이 상국3
1Korea Maritime and Ocean University
1한국해양대학교 전파공학과
2국방기술품질원
3국방과학연구소
*교신저자. *Corresponding Author. 
30 November 2014. pp. 407-412
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Abstract

In this paper, we propose an underwater acoustic communication of FH-MFSK(Frequency-Hopped Multiple Frequency Shift Keying) system with multiple orthogonal property. Generally, the processing of FSK(Frequency Shift Keying) method is simple, but it is vulnerable to ISI (Inter-Symbol Interference) caused by multipath transmission. In this paper, the orthogonal codes are generated with the same number of transmitting symbols, and these codes are corresponding to multiple frequencies. We used m-sequence to generate multiple orthogonal codes. We compared the performance of proposed method with conventional MFSK method via the experiment. As a result, we confirmed that the proposed method shows 6~10 % lower error rate at 100 bps than conventional method.

Keywords
Underwater acoustic communication
Multipath propagation
Spread spectrum
Frequency hopping
Frequency shift keying
Multiple orthogonal codes

본 논문에서는 다중 직교 특성을 갖는 FH-MFSK(Frequency-Hopped Multiple Frequency Shift Keying) 방식의 수중음향통신을 제안한다. 일반적으로 FSK(Frequency Shift Keying) 방식은 처리 과정이 단순하지만 다중 경로 전달로 인해 발생하는 인접 심볼간 간섭에 취약하다. 본 논문에서는 전송하고자 하는 심볼 수와 동일한 서로 직교 성질을 갖는 코드들을 생성한다. 이 코드 값들은 각각 다수의 주파수들에 대응된다. 이러한 다중 직교 코드를 생성하기 위해 m-sequence를 이용하였다. 실험을 통해 제안된 방법의 성능을 기존의 MFSK 방식과 비교하였다. 100 bps 전송율에서 제안한 방법은 기존의 방법보다 오차율이 6 ~ 10 % 낮게 나타났다.

키워드
수중음향통신
다중경로 전달
대역 확산
주파수 도약
주파수 천이 변조
다중 직교 코드
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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 :6
  • Pages :407-412
  • Received Date : 2014-06-27
  • Accepted Date : 2014-08-29
  • DOI :https://doi.org/10.7776/ASK.2014.33.6.407
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