Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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A Study on the Underwater Acoustic Communication with Direct Sequence Spread Spectrum

직접 수열 대역확산 방식을 이용한 수중음향통신 연구

  • Han, Jeong-Woo (Dept. of Radio Communication Engineering, Korea Maritime University) ;
  • Kim, Ki-Man (Dept. of Radio Communication Engineering, Korea Maritime University) ;
  • Son, Yoon-Jun (Defense Agency for Technology and Quality)
  • Received : 2011.08.30
  • Accepted : 2011.10.20
  • Published : 2011.10.31
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Abstract

In this paper, we study the application of DSSS(Direct Sequence Spread Spectrum) in underwater acoustic communication for robust the ISI(Inter-Symbol Interference. We confirm the application of DSSS in underwater acoustic communication in underwater by the simulation with underwater channel impulse response and experiment. As a simulation result, the BER of QPSK technique is $1.14{\times}10^{-1}$ and the BER of DSSS technique is $6.73{\times}10^{-3}$. And we performed the experiment of DSSS technique in underwater. As a experiment result, the BER of QPSK technique is $3.19{\times}10^{-1}$ and the BER of DSSS technique is $5.17{\times}10^{-4}$.

이 논문에서는 수중음향통신의 성능 저해 요소 가운데 하나인 다중경로로 인한 인접 심벌간의 간섭(Inter-Symbol Interference)을 극복하기 위하여 직접 수열 대역확산(Direct Sequence Spread Spectrum) 기법의 적용성에 관해 연구하였다. 직접 수열 대역확산 방식은 육상이동통신 분야에서는 이미 널리 적용되고 있으나 수중음향통신에서는 상대적으로 적은 관심을 받았다. 이에 그 적용성을 검증하기 위해 실제 수중 채널에서 수집한 채널 응답 함수를 이용하여 모의실험을 수행한 결과 일반적인 QPSK (Quadrature Phase Shift Keying) 기법의 경우 BER(Bit Error Rate)이 $6.73{\times}10^{-3}$이였으며, 직접 수열 대역확산기법이 적용된 경우 BER이 $1.14{\times}10^{-1}$으로 일반적인 QPSK에 비해 향상된 성능을 나타내는 것을 확인할 수 있었다. 근거리 해상 실험을 수행한 결과 일반적인 QPSK 기법의 경우 전송률 1 kbps에서 BER이 $3.19{\times}10^{-1}$이였으며, 직접 수열 대역확산 기법이 적용된 경우 BER이 $5.17{\times}10^{-4}$이었다.

Keywords

References

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