A Doppler Compensation Method Based on the Sinusoidal Signal in OFDM Underwater Communication System
Main Article Content
Abstract
In this paper, we propose a method uses to compensate Doppler frequency shift for underwater acoustic communication systems using OFDM technology. The calculation of the Doppler frequency shift compensation in the article is done in two steps. The first step is coarse synchronization through the use of the carrier signal attached to the end of each frame transmitted signal. In this step, based on the carrier signal to calculate the frequency deviation between the transmitter and receiver due to the relative motion between the transmitter and receiver causes Doppler effect. However, the calculation of the frequency shift is not exactly in coarse synchronization, then before decoding M-QAM, technical constellation phase rotation signal is applied to increase the quality of the received signal. The results of research and simulation, experimentation showed that the system can handle the underwater communication at speeds of more than 2m/s.
Keywords
OFDM, UWA, Doppler
Article Details
References
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[2]. Dinh Hung Do, Quoc Khuong Nguyen, Do Viet Ha, and Nguyen Van Duc, A Time Synchronization Method for OFDM-Based Underwater Acoustic Communication Systems, Inter. Conf. on Advanced Technologies for Communications (ATC), pp. 131-134, 2016.
[3]. Baosheng Li, Student Member, IEEE, Shengli Zhou, Member, IEEE, Milica Stojanovic, Member, IEEE, Lee Freitag, Member, IEEE, and Peter Willett, Fellow, IEEE, Multicarrier Communication over Underwater Acoustic Channels with Nonuniform Doppler Shifts, IEEE Journal of Oceanic Engineering, vol. 38, no. 4, pp. 614-631, 2013.
[4]. M.Stojanovic, Low complexity OFDM detector for underwater acoustic channels, IEEE Oceans Conf., Sept. 2006.
[5]. B. Li, S. Zhou, M. Stojanovic, L. Freitag, and P. Willett, Non-uniform Doppler compensation for zero-padded OFDM over fast-varying underwater acoustic channels, in OCEANS 2007-Europe. IEEE, 2007, pp.1-6.
[6]. T. Schmidl and D. Cox, Robust frequency and Timing synchronization for OFDM, IEEE Trans. Commun, vol. 45, no.12, 1997:1613-1621