Underwater mobile communication scheme based on the direct sequence spread spectrum transmission using Doppler estimation and its sea trial results with the pseudo-moving transmission

Seung-Geun Kim

doi:10.7776/ASK.2022.41.1.016

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2022 Vol.41, Issue 1 Preview Page Next Page

Research Article

Underwater mobile communication scheme based on the direct sequence spread spectrum transmission using Doppler estimation and its sea trial results with the pseudo-moving transmission 도플러 추정을 적용한 직접수열 대역확산 전송 기반 수중 이동통신 방법 및 가상 이동신호를 이용한 해상시험 결과

January 2022. pp. 16-29

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Abstract

This paper presents a Doppler shift estimation method and signal processing schemes for Direct Sequence Spread Spectrum (DSSS) transmission to overcome the Doppler shift due to the moving of the underwater communication unit. The proposed method estimates a Doppler shift via 2 step procedures using the preamble with the two 64-length Frank sequences which has a good self-correlation characteristic and is insensitive to the Doppler shift. Furthermore, a packet of DSSS underwater mobile communication and a RAKE receiver are designed using the proposed Doppler shift estimation method. Due to the modulation scheme of the designed DSSS underwater mobile communication using Differential-Quadrature Phase Shift Keying (DQPSK) for the data symbol transmission, the RAKE receiver dose not need a phase tracking and easily makes coherent signals among the combining RAKE branches. The designed RAKE receiving scheme including the proposed Doppler shift estimation method successfully decides information data using the DSSS signal transmitted from the pseudo-moving transmitter with velocity upto about 17.5 m/s.

Keywords

Underwater mobile communication

Doppler shift estimation

Direct Sequence Spread Spectrum (DSSS) Transmission

RAKE receiver

본 논문에서는 수중통신 장치가 수중에서 이동시 발생하는 도플러(Doppler) 편이를 극복하기 위한 도플러 편이 추정방법과 직접수열 확산대역 전송의 신호처리 방법을 제시한다. 제안한 방법은 도플러 편이에 강인하고, 자기상관 특성이 우수한 64길이의 Frank 신호열을 두 번 반복하는 프리앰블을 사용하여 2단계로 도플러 편이를 추정한다. 또한, 제안한 방법을 직접수열 대역확산 전송을 사용하는 수중통신방식에 적용하여 수중이동통신용 패킷 설계와 RAKE 수신기를 설계한다. 설계한 확산대역 수중이동통신 변조방식은 데이터 심볼을 Differential-Quadrature Phase Shift Keying(DQPSK) 변조하여 수신시 위상추적이 필요 없고, RAKE 수신기에서 동위상 결합이 용이하게 할 수 있는 장점이 있다. 제안한 도플러 편이 추정방법을 포함하는 RAKE 수신방법은 약 17.5 m/s의 이동속도까지 가상으로 이동하는 송신기로부터 수신한 직접수열 대역 확산 신호를 성공적으로 수신한다.

키워드

수중이동통신

도플러 편이 추정

직접수열 확산 전송

RAKE 수신기

References

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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 : 41
No :1
Pages :16-29
Received Date : 2021-10-12
Revised Date : 2021-11-11
Accepted Date : 2021-11-17
DOI :https://doi.org/10.7776/ASK.2022.41.1.016

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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