한국항공우주학회지 (Journal of the Korean Society for Aeronautical & Space Sciences)

  • 제49권11호
  • /
  • Pages.941-944
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  • 2021
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  • 1225-1348(pISSN)
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  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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변조지수가 2/3인 PCM/FM

PCM/FM With Modulation Index of 2/3

  • 투고 : 2021.07.29
  • 심사 : 2021.10.08
  • 발행 : 2021.11.01
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초록

텔레메트리 분야에서 많이 사용되는 PCM/FM은 변조지수가 0.7인데 이를 2/3로 변경하면 3-PSK로 해석이 가능하며 위상 변화 트렐리스 상태수가 3이 되어 간단한 비터비 복호기로 수신이 가능하다. 컴퓨터 모의실험한 결과 AWGN 채널에서 Eb/No 수신 성능은 BER이 10-5일 때 약 8.3dB로 이론적 한계값에 근접한다.

PCM/FM with a modulation index of 0.7 is widely used in the telemetry field. If the modulation index is slightly changed to 2/3, it can be interpreted as 3-PSK with a state number of 3 in phase transition trellis and can be received with a simple Viterbi decoder. As a result of computer simulation, the Eb/No performance in the AWGN channel is about 8.3 dB when the BER is 10-5, which is close to the theoretical limit.

키워드

참고문헌

  1. Telemetry Group Range Commanders Council, Telemetry Applications Handbook, Document 119-06, May, 2006, pp. 2~9.
  2. Punnoose, R. J, "Re-Engineering PCM/FM as a Phase Modulation Scheme," International Telemetering Conference Proceedings, Vol. 44, 2008.
  3. Svensson, A., Sundberg, C.-E. and Aulin T., "A class of reducedcomplexity Viterbi detectors for partial response continuous phase modulation," IEEE Trans. on Commun., Vol. 32, October 1984, pp. 1079~1087. https://doi.org/10.1109/TCOM.1984.1095967
  4. Othman, R., Study of reception techniques for aeronautical telemetry modulations. Signal and Image processing, CentraleSupelec, 2019.
  5. Kumaraswamy, B., "Applications of PAM representation of CPM," Master's Thesis, 2008.
  6. Geoghegan, M., "Improving the detection efficiency of conventional PCM/FM telemetry by using a multi-symbol demodulator," International Telemetering Conference Proceedings, Vol. 36, 2000, pp. 675~682.
  7. Xingwen, D., Yumin, Z., Hongyu, C. and Ming, C., "Noncoherent demodulation with Viterbi decoding for partial response continuous phase modulation," Proceedings of the International Telemetering Conference, Las Vegas, NV, October 2013.
  8. Gu, Y. M., "Evaluation of the Effect of Differential Encoder on SOQPSK-TG Receiver Performance," Journal of The Korean Society for Aeronautical and Space Sciences, Vol. 49, No. 7, July, 2021, pp. 589~592. https://doi.org/10.5139/JKSAS.2021.49.7.589