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Receiver design for differential phase-shift keying underwater acoustic communication

차동 위상 천이 변조 방식의 수중음향통신을 위한 수신기 설계

Eun-Hye Jeon1
,
Taek-Ik Kwon1
,
Ki-Man Kim1*
전 은혜1
,
권 택익1
,
김 기만1*
1Department of Radio Communication Engineering, Korea Maritime and Ocean University
1한국해양대학교 전파공학과
*교신저자. *Corresponding Author. 
30 September 2016. pp. 368-374
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Abstract

This paper presents constructing transmitter and receiver by using a direct sequence spread spectrum techniques to DPSK (Differential Phase-Shift Keying) scheme in underwater acoustic communication. Since DPSK signal can be demodulated if the receiver knows only the phase difference between the adjacent bits, DPSK receiver structure has the advantage of being simplified. In the conventional receiver, two adjacent symbols of transmitted signal before despread are passed to the transition correlator that detects data by comparing maximum correlation outputs. At this time, the error for maximum value of the correlator output may increase because of low SNR (Signal to Noise Ratio) or high Doppler shift frequency according to the underwater channel. In this paper, we propose a method for accurate detection result using the width as well as the magnitude among outputs produced by the correlator. The performances of the proposed method was evaluated by simulation and lake trial data.

Keywords
DPSK communication
DSSS (Direct Sequence Spread Spectrum)
Correlator
Underwater acoustic communication
Doppler channel

본 논문은 기존의 DPSK(Differential Phase-Shift Keying) 방식 수중음향통신에 직접 수열 대역확산 기법을 적용하여 송수신단을 구성하는 내용을 다루었다. DPSK방식의 수신기에서는 인접 비트 간 위상차만 알고 있으면 복조가 가능하기 때문에 수신기 구조가 간단해지는 장점이 있다. 기존의 DPSK 수신단에서는 역확산 전 신호의 두 심볼 씩 전이 상관기로 입력되면 상관 결과의 최대값을 비교하여 데이터를 검출하는데 이 때 채널에 따른 낮은 SNR(Signal to Noise Ratio) 또는 높은 도플러 천이 주파수 때문에 전이 상관기 출력의 최대값 오류율이 증가할 수 있다. 본 논문에서는 전이 상관기에서 생성되는 다수 출력들의 크기뿐만 아니라 간격을 추가적으로 이용하여 더욱 정확한 검출 결과를 얻을 수 있도록 하는 방법을 제안하였다. 제안된 방법의 성능은 모의 및 호수실험을 통해 획득한 데이터를 이용하여 분석되었다.

키워드
DPSK 통신
직접 수열 대역확산
상관기
수중음향통신
도플러 채널
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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 : 35
  • No :5
  • Pages :368-374
  • Received Date : 2016-06-20
  • Accepted Date : 2016-07-19
  • DOI :https://doi.org/10.7776/ASK.2016.35.5.368
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