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Performance of COFDM in Underwater Acoustic Channel with Frequency Selective Fading

주파수 선택적 페이딩을 갖는 수중 음향 채널에서 COFDM의 성능

Chulwon Seo
,
Jihyun Park
,
Kyu-Chil Park
,
Jong Rak† Yoon†
서 철원
,
박 지현
,
박 규칠
,
윤 종락††
Dept. of Information and Communications Engineering Pukyoung National University
부경대학교 정보통신공학과
†교신저자. †Corresponding Author. 
30 September 2013. pp. 377-384
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Abstract

In this paper, performance of COFDM (Coded Orthogonal Frequency Division Multiplexing) which is OFDM with a forward error correction code, is studied in frequency selective fading underwater acoustic communication channel. The OFDM is a multiplexing technique resistant to frequency selective multipath channel. In OFDM, a broadband information signal is transformed into several narrow band signals and transmits narrow band signals whose bandwidths are less than the channel coherence bandwidth. However, its performance is degraded in a specific narrow band signal due to its deep fading by multipath. To mitigate this degradation, COFDM which is OFDM with convolution code as a forward error correction code, is evaluated. The performance of COFDM is found to be better than that of OFDM in multipath channel.

Keywords
Underwater acoustic communication
Underwater multipath channel
OFDM
Frequency selective fading
Convolutional code
COFDM

수중 음향 통신 채널에서 주파수 선택적 페이딩에 강한 OFDM(Orthogonal Frequency Division Multiplexing)에 전방오류정정 기법을 적용한 COFDM(Coded OFDM)의 성능을 평가하였다. OFDM은 광대역신호를 협대역 신호로 나누어 전송하는 기법으로 다중경로에 의한 성능저하를 해결하는데 효과적인 전송기법이지만, 특정 부 채널에 깊은 페이딩이 있는 경우에 오류가 증가하여 성능이 저하된다. 이러한 페이딩에 대한 오류를 감소시키기 위해 컨벌루션 코드를 적용한 COFDM을 제안한다. 다중 경로 채널에서 COFDM이 OFDM에 비해 상대적으로 우수한 전송성능을 보였다.

키워드
수중 음향 통신
수중 다중경로 채널
OFDM
주파수 선택적 페이딩
컨벌루션 코드
COFDM
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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 : 32
  • No :5
  • Pages :377-384
  • Received Date : 2013-07-16
  • Accepted Date : 2013-08-22
  • DOI :https://doi.org/10.7776/ASK.2013.32.5.377
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