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2013 Vol.32, Issue 2 Preview Page
Performance Analysis of Underwater Acoustic Communication Systems with Turbo Equalization in Korean Littoral Sea

한국 연근해 환경에서 터보 등화기를 이용한 수중음향통신 시스템 성능 분석

Tae-Doo Park1
,
Jeong-Woo Han1
,
Ji-Won Jung1
,
Ki-Man Kim1*
,
Sang-Kook Lee2
,
Seung-Yong Chun2
,
Kweon Son2
박 태두1
,
한 정우1
,
정 지원1
,
김 기만1*
,
이 상국2
,
천 승용2
,
손 권2
1한국해양대학교 전파공학과
2국방과학연구소
*Corresponding Author
31 March 2013. pp. 124-130
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Abstract

The performance of underwater acoustic communication system is sensitive to the ISI( Inter-Symbol Interference) due to delay spread develop of multipath signal propagation. The equalizer is used to combat the ISI. In this paper, the performances of underwater acoustic communication with turbo equalizer were evaluated by real data collected in Korean littoral sea. As a result, when one iterative decoding using turbo equalizer is applied, the performance was improved 1.5 dB than the case of the non-iterative equalizer at BER 10-4. In the case of two or three iterations the performance was enhanced about 3.5 dB, but the performance wasn't improved any more in the case of more than three times.

Keywords
Underwater acoustic communication
Turbo equalization
Channel impulse response
Bit Error Rate
Channel coding
Interleaver

수중음향통신 시스템의 성능은 신호의 다중경로 전달 과정에 의해 발생하는 지연 확산 현상 때문에 인접 심벌 간 간섭 (ISI)에 영향을 받는다. 인접 심벌 간 간섭을 제거하기 위해 등화기가 사용되어진다. 본 논문에서는 한국 연근해에서 수집된 실측 데이터를 이용하여 채널 부호화 기법과 등화기가 결합하여 동작하는 터보 등화기를 갖는 수중음향통신 시스템의 성능을 검증하였다. 그 결과 터보 등화기를 이용하여 반복 복호를 하였을 때는, 1회 반복 시 BER(Bit Error Rate) 10-4을 기준으로 반복이 없는 등화기를 사용하였을 때 보다 1.5 dB 성능이 향상되었다. 또한 반복이 2~3회인 경우 약 3.5 dB 성능이 향상되었으나, 3회 이상 반복하였을 때는 더 이상 성능이 향상되지 않았다.

키워드
수중음향통신
터보 등화기
채널 임펄스 응답
BER
채널 부호화
인터리버
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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 :2
  • Pages :124-130
  • Received Date : 2012-07-11
  • Revised Date : 2012-10-08
  • Accepted Date : 2013-01-01
  • DOI :https://doi.org/10.7776/ASK.2013.32.2.124
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