The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
권호 표지
DOI QR코드

DOI QR Code

Baseband Receiver Design for Maritime VHF Digital Communications

해양 VHF 디지털 통신을 위한 기저대역 수신기 설계

  • 김승근 (한국해양연구원 해양시스템연구부) ;
  • 윤창호 (한국해양연구원 해양시스템연구부) ;
  • 김시문 (한국해양연구원 해양시스템연구부) ;
  • 임용곤 (한국해양연구원 해양시스템연구부)
  • Received : 2011.02.06
  • Accepted : 2011.08.05
  • Published : 2011.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper a design of $\pi$/4-DQPSK baseband receiver for the exchange of digital data and e-mail between shore and ship stations and/or among ship stations in the maritime mobile service VHF channels is described. Due to the permitted relatively big frequency instability of local oscillators at the transmitter and the receiver of maritime communication system, the designed baseband receiver should have the capabilities of correct estimation and compensation of the synchronization parameters, such as symbol timing and frequency offset, from the received signal which might include relatively big frequency error. Simulated BER results show that the designed baseband receiver works less than 0.5dB loss under AWGN channel when the normalized frequency offset of the received signal is more then 20%.

분 논문에서는 해상 이동업무에 할당되어 있는 VHF 대역에서 선박과 육상간 및 선박과 선박간에 ${\pi}$/4-DQPSK 변조방법을 이용하여 디지털 데이터 및 e-mail을 교환하기 위한 기저대역 수신부 설계에 대하여 논한다 해상 통신 장치는 상대적으로 큰 주파수 불안정성을 허용하기 때문에, 상대적으로 큰 주파수 편이를 갖을 수 있는 수신 및 주파수 편이 등의 동기파라미터를 추정하고 이를 보상할 수 있는 기능을 갖도록 기저대역 수신기를 설계하였다. BER의 모의실험을 통하여 설계한 기저대역 수신기는 20% 이상의 정규화 주파수 편이가 존재하더라도 AWGN 채널환경하에서 0.5dB 이내의 성능열화가 있음을 확언 하였다.

Keywords

References

  1. DRAFT, "Liaison statement to ITU : VHF radio system and equipment for the exchange of data and e-mail on maritime appendix 18 channels under WRC-07 Agenda item 1.14", 2003.
  2. IMO, "GMDSS Manual," IMO IC970E, 4th Edi., 2007.
  3. ITU, "ITU-R M.1371-1 Technical characteristics for a universal shipborne automatic identification system using time division multiple access in the VHF maritime mobile band", 2001.
  4. Resolution 342 (Rev. WRC-2000) : "New technologies to provide improved efficiency in the use of the band 156-174 MHz by stations in the maritime mobile service"
  5. 위규진, 류충상, 송종호, 송주연, 엄진우, 임은택, "WRC-07 주요 결과 고찰 및 국내 대응 2부," 정보와 통신, 25권 2호, pp. 73-82, 2008.02.
  6. Recommendataion ITU-R M.1842 : "Characteristics of VHF radio system and equipment for the exchange of data and electronic mail in the maritime mobile service RR appendix 18 channels", 2008.
  7. Recommendation ITU-R M.1842-1 : "Characteristics of VHF radio systems and equipment for the exchange of data and electronic mail in the maritime mobile service RR appendix 18 channels", 2009.
  8. Chang-Ho Yun, A-Ra Cho, Seung-Geun Kim, Jong-Won Park and Young-Kon Lim, "Design of multiband maritime network for ships and its applications," J. of KIMICS, Vol.7, No.3, pp. 314-322, Sept. 2009.
  9. C. L. Liu and K. Feher, "Noncoherent detection of $\pi$/4-QPSK systems in a CCI-AWGN combined interference environment," Proc. of IEEE VTC'89, pp.83-94, 1989.
  10. C. L. Liu and K. Feher, "${\pi}/4$-QPSK modems for satellite sound/data broadcast systems," IEEE Trans. on Broadcasting, Vol.37, No.1, pp. 1-8, Mar. 1991. https://doi.org/10.1109/11.75121
  11. S. Chennakeshu and G. J. Saulnier, "Differential detection of ${\pi}/4$-shifted-DQPSK for digital cellular radio," IEEE Trans. on Vehicular Techn., Vol.42, No.1, pp.46-57, Feb. 1993. https://doi.org/10.1109/25.192386
  12. D. Lui and C. Wei, "Synchronization scheme in non-coherent demodulator for TDMA digital modile radio system," Proc. of IEEE ISCAS'99, Vol.4, No.463-466, 1999.
  13. R. Danesfahani, M. Naser-Moghaddasi and, M. Mahlouji, "Symbol timing synchronization of $\pi$/4-DQPSK signals using polyphase filterbank," Proc. of EUROCON'07, pp.882-887, 2007.
  14. M. Ikura, K. Ohno and F. Adachi, "Baseband processing frequency-drift- compensation for QDPSK signal transmission," IEE Electronic Letters, Vol.27, No.17, Aug. 1991.
  15. J. Joung and G. Stuber, "Frequency offset estimation algorithm for $\pi$/4-DQPSK TDMA mobile ratio," IEEE Trans. on Vehicular Techn., Vol.49, No.5, pp.1885-1892, Sep. 2000. https://doi.org/10.1109/25.892591
  16. L. E. Miller and J. S. Lee, "BER expressions for differentially detected ${\pi}/4$ DQPSK modulation", IEEE Trans. on Commun., Vol.46, No.1, pp.71-81, Jan 1998. https://doi.org/10.1109/26.655405
  17. Umberto Mengali and Aldo N.D'Andrea, Synchronization Techniques for Digitla Receivers, PLENUM Press, New York, 1997.
  18. Francis D. Natali, "AFC tracking algorithms," IEEE Trans. on Commun., Vol.COM-32, No.8, pp.935-947, Aug. 1984.
  19. K.E. Scott and E. B. Olasz, "Simultaneous clock phase and frequency offset estimation," IEEE Trans. on Commun., Vol.43, No.7, pp. 2263-2270, July 1995. https://doi.org/10.1109/26.392969