A method of frame synchronization of binary phase shift keying signal in underwater acoustic communications

Gyeong-pil Yang; Wan-Jin Kim; Dae-Won Do; Seokjun Ko

doi:10.7776/ASK.2022.41.2.159

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2022 Vol.41, Issue 2 Preview Page Next Page

Research Article

A method of frame synchronization of binary phase shift keying signal in underwater acoustic communications 수중 음향통신에서 binary phase shift keying신호의 프레임동기 방법

31 March 2022. pp. 159-165

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Abstract

In this paper, a frame synchronization structure for the Binary Phase Shift Keying (BPSK) modulation method in underwater acoustic communication was proposed. The proposed frame synchronization structure is largely divided into two. First, the approximate position and frequency offset of the frame are obtained by non- coherent correlation and sliding Fast Fourier Transform (FFT) method. Second, after compensating for the frequency error to the received signal, the exact position of the frame is obtained by coherent correlation method. Maritime experiments were conducted to confirm the performance of the 2-STEP frame synchronization structure. It was showed that the limitations of the non-coherent correlation and sliding FFT method can be verified when the power of the received signal was greatly reduced due to the channel characteristics. As a result, stable frame synchronization could be obtained by compensating for the frequency error and then using the coherent correlation method.

Keywords

Underwater acoustic communications

Non-coherent correlation

Sliding Fast Fourier Transform (FFT)

Frequency offset

Coherent correlation

Frame synchronization

본 논문에서는 수중 음향통신에서 Binary Phase Shift Keying(BPSK) 변조방식에 대한 프레임 동기 구조를 제안하였다. 제안된 프레임 동기 구조는 크게 두 가지로 나뉜다. 우선, 비동기 방식 상관과 Sliding 고속 푸리에 변환 방식으로 프레임의 대략적인 위치와 주파수 옵셋을 획득한다. 두번째는 주파수 오차를 신호에 보상한 후, 동기 방식 상관으로 정확한 프레임의 위치를 확인한다. 프레임 동기 구조의 성능 확인을 위해 해상실험을 수행하였다. 수신신호는 채널 특성으로 인해 전력이 크게 감소함을 확인하였으며, 이를 통해 비동기 방식 상관과 Sliding 고속 푸리에 변환 방식의 한계를 확인하였다. 결과적으로, 주파수 오차를 보상한 후 동기 방식 상관방식을 사용함으로써 안정적인 프레임 동기를 획득할 수 있었다.

키워드

수중 음향통신

비동기 방식 상관

Sliding 고속 푸리에 변환

주파수 옵셋

동기 방식 상관

프레임 동기

References

S. Ko and W. J. Kim, "Robust frame synchronization algorithm in time-varying underwater acoustic communication channel" (in Korean), J. Acoust. Soc. Kr. 39, 8-15 (2020).

M. Stojanovic, "Underwater acoustic communications," Proc. Electro/International, 1-32 (1995). 10.1007/978-1-4757-3617-5_1

J. H. Goh, A. Shaw, and A. I. Al-Shamma'a, "Underwater wireless communication system," J. Physics : Conference Series, 178, 156-161 (2009). 10.1088/1742-6596/178/1/012029

F. Wei, X. Xiaomei, Z. Lan, and C. Yougan, "A frame synchronization method for underwater acoustic communication on mobile platform," Proc. Int. Conf. IASP. 9-11 (2010).

M. Chiani, "Noncoherent frame synchronization," IEEE Trans. on Comm. 58, 1536-1545 (2010). 10.1109/TCOMM.2010.05.090091

E. Jacobsen and R. Lyons, "The sliding DFT," IEEE Signal Process. Mag. 20, 74-80 (2003). 10.1109/MSP.2003.1184347

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 :2
Pages :159-165
Received Date : 2022-01-17
Revised Date : 2022-02-18
Accepted Date : 2022-03-04
DOI :https://doi.org/10.7776/ASK.2022.41.2.159

The Journal of the Acoustical Society of Korea ISSN:1225-4428(Print) 2287-3775(Online) 한국음향학회지

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