DOI QR코드

DOI QR Code

부 대역을 이용한 수중 음향 통신 송수신 구조 및 실험 결과 분석

Analysis of Transceiver Structure and Experimental Results of Underwater Acoustic Communication Using the Sub-band

  • Jeong, Hyun-Woo (Department of Radio Communication Engineering, Korea Maritime and Ocean University) ;
  • Shin, Ji-Eun (Department of Radio Communication Engineering, Korea Maritime and Ocean University) ;
  • Jung, Ji-Won (Department of Radio Communication Engineering, Korea Maritime and Ocean University)
  • 투고 : 2020.11.25
  • 심사 : 2020.12.03
  • 발행 : 2020.12.30

초록

본 논문에서는 부 대역 처리를 이용하는 수중 통신에서 은밀성과 성능 향상 관점에서 효율적인 송수신 구조를 제시하였다. 은밀성적인 측면에서는 암호화된 부호화 비트를 블록으로 나누어 각 비트의 정보를 이용하여 중심 주파수와 부 대역을 결정하므로 은밀성을 유지하는 측면에서 효과적이다. 수중 통신에서 성능적인 측면에서는 다중 경로 특성, 도플러 확산, 프레임 동기 등이 성능에 영향을 미치는 결정적인 요소이다. 따라서 본 논문에서는 이러한 요소들을 극복하기 위해, 비동기 에너지 검출 방식과 터보 등화 기법, 그리고 최적의 프레임 동기 방식을 제안하여 수신부에 적용하였다. 호수 실험에서 최적의 프레임 동기 방식을 수신부에 적용한 결과 다섯 개의 프레임 중에서 네 개의 프레임에서 오류를 모두 정정함을 확인하였다.

This paper presented efficient transceiver structure using sub-band processing for underwater communication in terms of covertness and performance improvement. In aspect of covertness, encrypted coded-bits are divided into groups, and center frequency and sub band are determined by coded-bits of each group. Therefore, as center frequencies are changed randomly, it maintain the covertness effectively. In aspect of performance improvement, the performance of underwater communication mainly depends on multi-path propagation characteristics, Doppler-spread, and frame synchronization. Accordingly, in order to overcome these effects, non-coherent energy detector and turbo equalization method are employed in receiver side. Furthermore, optimal frame synchronization was proposed. Through the simulation and lake experiment, performance analysis was conducted. Especially in the lake experiment, as a result of applying optimal frame synchronization method to receiver structure, errors are corrected in most frames.

키워드

참고문헌

  1. M. Stojanovic. J. A. Catipovic and J. G. Proakis, "Phase-coherent digital communications for underwater acoustic channels." IEEE J. Oceanic Eng. Vol. 19pp. 100-111. 1994. https://doi.org/10.1109/48.289455
  2. D. B. Kilfoyle and A. B. Baggeroer, "The state of art in underwater acoustic telemetry,", IEEE Journal of the Oceanic Engineering, vol. 25, no. 1, pp. 4-27, 2000. https://doi.org/10.1109/48.820733
  3. J. H. Park, Jr, "LPI TECHNIQUES IN THE UNDERWATER ACOUSTIC CHANNEL," IEEE Military Communication Conference-Communications-Computers, vol. 1, pp. 10.5.1-10.5.5, Oct 1986.
  4. E. M. Sozer, J. G. Proakis, M. Stojanovic, J. A. Rice, A. Benson and M. Hatch, "Direct Sequence Spread Spectrum Based Modem for Under Water Acoustic Communication and Channel Measurements," IEEE. Oceans'99 MTS, vol. 1, pp. 228-233, Sep. 1999.
  5. Taeseok Ahn, Jiwon Jung, Taedoo Park and Dongwon Lee, "Turbo Equalization for Covert communication in Underwater Channel", Journal of the Korea Institute of Information and Communication Engineering, vol.20, no. 8, pp. 1422-1430, Aug. 2016. https://doi.org/10.6109/jkiice.2016.20.8.1422
  6. Stephen B. Weinstein, "The history of orthogonal frequency-division multiplexing" IEEE Communications Magazine, 47, no.11, pp. 26-35, Nov. 2009. https://doi.org/10.1109/MCOM.2009.5307460
  7. Minhyuk Kim, Taedoo Park, Byeongsu Lim, Ingye Lee, Deockgil Oh and Jiwon Jung, "Analysis of Turbo Coding and Decoding Algorithm for DVB-RCS Next Generation", Journal of the Korea Information and Communications Society, Vol.36, No.9, pp. 537-545, Sep. 2011.
  8. He Xianguo. Design and Optimization of Pseudo-random Interleaver in Turbo Code[D].Hangzhou University of Electronic Science and Technology, pp. 120-128, 2014.
  9. J. Salz, "Opimum mean-square decision feedback eqaulization," Bell System Technical Jounal 52, pp. 1341-1373, 1973. https://doi.org/10.1002/j.1538-7305.1973.tb02023.x
  10. R. Koetter, A. C. Singer, and M. Tuchler, "Turbo equalization," IEEE Signal Processing Magazine, vol. 21, no. 1, pp. 67-0, 2004. https://doi.org/10.1109/MSP.2004.1267050
  11. Jiwon Jung, "Performance Analysis of Turbo Equalizer in the Multipath Channel", Journal of Korea Institute of Information, Electronics, and Communication Technology, Vol 5, No 3, pp.169-173, Sep. 2012. https://doi.org/10.17661/JKIIECT.2012.5.3.169
  12. J.W. Jung and K.M. Kim, "Optimizing of iterative turbo equalizer for underwater sensor communication" International Journal of Distributed Sensor Networks, pp. 1-6, Dec. 2013.
  13. Joo-Hyoung Lee, Geun-Hyeok Lee, Jeong-Ha An, Ki-Man Kim, Min-Su Han, and SeongYong Kim,"Signal synchronization method for depth information transmission of high-speed underwater vehicle" (in Korean), J.Acoust. Soc. Kr, 39, pp. 69-76, Mar. 2020.
  14. Hahyun Sung and Jiwon Jung, "Performance analysis of turbo codes based on underwater experimental data", Journal of the Korea n Society of Marine Engineering, Vol. 40, No. 1 pp. 45-49, 2016.