Article
Engineering, Civil
Per Zetterberg, Fredrik Lindqvist, Bernt Nilsson
Summary: This article introduces a novel approach for underwater acoustic communication in challenging channels, utilizing the MC-BFSK waveform to achieve better performance in low data rate applications. The method enhances robustness against Doppler effects and reverberation, and demonstrates the ability to decode frames without a direct path between transmitter and receiver.
IEEE JOURNAL OF OCEANIC ENGINEERING
(2022)
Article
Engineering, Civil
Viktor Lidstrom
Summary: This study investigates a method that uses M-ary permutation frequency-shift keying (SPFSK) alphabets as the symbol space for robust data transmission in underwater acoustic channels. The use of polar coding and time/frequency guards improves receiver statistics. Simulation results show that increasing the alphabet size enhances receiver performance. The method also performs well in watermark benchmark testing.
IEEE JOURNAL OF OCEANIC ENGINEERING
(2023)
Article
Computer Science, Information Systems
Hany S. Hussein, Turki M. Alanazi, Mohammed Zubair Shamim, Mohammed Sayeeduddin Habeeb, Mohammed Usman, Mohammed Farrag
Summary: The novel fully quadrature subcarrier-index shift keying orthogonal frequency division multiplexing (FQSISK-OFDM) modulation scheme proposed in this paper successfully distinguishes between active odd and even subcarriers, reducing power leakage and achieving higher spectral and energy efficiencies for underwater acoustic communications. Simulation results demonstrate the superiority of FQSISK over plain OFDM and OFDM index modulation techniques.
Article
Computer Science, Information Systems
Hojun Lee, Yongcheol Kim, Seunghawn Seol, Wanjin Kim, Jongmin Ahn, Jaehak Chung
Summary: This paper proposes continuous phase-multiple chirp modulation (CP-MCM) and hybrid orthogonal whistle modulation (HOWM) methods to improve the mimicking performance and bit error rate (BER) of underwater biomimetic covert communications. The results of computer simulations and practical ocean experiments show that the proposed HOWM achieves better BER performance compared to conventional methods.
Article
Acoustics
Ruigang Han, Ning Jia, Jianchun Huang, Shengming Guo
Summary: This paper proposes a time-domain adaptive decision feedback equalization method for underwater acoustic communication, and further proposes a joint time-frequency domain equalization method to reduce the bit error rate. Numerical simulation and sea trial results confirm the effectiveness of these two methods.
Article
Chemistry, Analytical
Jeongha An, Hyungin Ra, Changhyun Youn, Kiman Kim
Summary: This paper proposes underwater acoustic communication using a generalized sinusoidal frequency modulation (GSFM) waveform, showing better performance in multipath channels compared to conventional linear frequency modulation (LFM) waveform with chirp spread spectrum (CSS). Through simulations, lake trials, and sea trials, experiments demonstrated the superior performance of the proposed GSFM method over the traditional CSS method, with lower bit error rates and higher reliability.
Article
Chemistry, Analytical
Peizhou Liu, Tiande Gao, Ruixuan Zhao, Zhaoyong Mao, Quanzhe Zhu
Summary: A novel parallel transmission method for wireless power and data based on FSK modulation and PLL demodulation is proposed in this paper. Experimental results showed that the data transmission is capable of achieving stable transmission within the range of output power variation.
Article
Environmental Sciences
Shijie Xu, Rendong Feng, Pan Xu, Zhengliang Hu, Haocai Huang, Guangming Li
Summary: This study focuses on the inversion method and signal resampling for sound moving transmission in underwater acoustic tomography research. A five-station sound transmission experiment was conducted in Huangcai reservoir, Changsha, China, and the received acoustic data was analyzed using signal resampling and 2D grid method. The feasibility and applicability of the method were demonstrated, providing innovative ideas for further development of temporal-spatial grided tomography observation.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Computer Science, Information Systems
Van Duc Nguyen, Hoai Linh Nguyen Thi, Quoc Khuong Nguyen, Tien Hoa Nguyen
Summary: The Doppler effect has a significant impact on the performance of orthogonal frequency division multiplexing (OFDM) systems, particularly in underwater acoustic (UWA) communication systems. To address the issue of Doppler shifts, channel estimation and inter-carrier interference (ICI) reduction are commonly performed. However, this approach leads to increased computational complexity. This study proposes a novel pilot structure and a frequency domain compensation method to overcome the challenges posed by the underwater channel and achieve Doppler phase shift compensation.
Article
Engineering, Electrical & Electronic
T. P. Sameer Babu, P. M. Ameer, R. David Koilpillai
Summary: This paper provides a survey of synchronization and Doppler estimation in underwater acoustic communication. It reviews the techniques proposed in the literature for different communication systems and highlights the challenges faced in MIMO OFDM synchronization. The paper also presents key open problems and areas that require future research attention.
INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Sha Zhu, Zhijie Chen, Yunxin Wang, Ya Jin, Kunpeng Zhai, Yunping Bai, Jun Tan, Peiyuan Wan, Xu Liu, Wei Li, Ning Hua Zhu
Summary: This paper proposes and demonstrates a photonic multi-format background-free binarily modulated microwave signal generator using a single dual-polarization dual-parallel Mach-Zehnder modulator. The generator features good reconfiguration and switchability, capable of generating microwave signals with multiple modulation methods.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Xinxin Gao, Ze Gu, Qian Ma, Wen Yi Cui, Tie Jun Cui, Chi Hou Chan
Summary: Driven by the demands for compact interconnects and fast information transfer, research on spoof plasmonic metamaterials has been focused on achieving individual modulation of amplitude or phase at single frequencies due to structural limitations. This study proposes and experimentally demonstrates an ultra-thin reprogrammable modulator consisting of a spoof surface plasmonic polariton (SSPP) waveguide and spoof localized surface plasmon (SLSP) resonators, allowing independent control of amplitude and phase of surface waves. By manipulating the SSPP waveguide and SLSP resonators in real-time, various programmable modulations such as amplitude-shift keying, phase-shift keying, quadrature amplitude modulation, and frequency-shift keying can be achieved. Measurement results confirm the potential applications of the reprogrammable plasmonic metamaterial in integrated circuits and communication systems.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Telecommunications
Xinyu Liu, Gang Qiao, Xin Qing, Naihua Zheng, Tong Li
Summary: This study proposes a mathematical method to evaluate the bit error rate of orthogonal frequency division multiplexing with cyclic prefix in an underwater acoustic channel. The study adopts statistical modeling and focuses on long-distance horizontal transmission in shallow water. The results of the study have practical implications for other underwater acoustic communication channels with different statistical characteristics.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Marine
Yufei Liu, Feng Zhou, Gang Qiao, Yunjiang Zhao, Guang Yang, Xinyu Liu, Yinheng Lu
Summary: A deep learning-based CSK-SS underwater acoustic communication system is proposed to improve performance in low signal-to-noise ratio and multipath effects by utilizing a neural network model. Experimental results show that the system is more reliable than conventional systems, especially when the communication rate is less than 180 bps at a signal-to-noise ratio of -8 dB.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Shuai Cao, Xiang Chen
Summary: This article proposes a novel method to mitigate the tracking error of moving targets caused by the Doppler shift in acoustic indoor positioning system (AIPS). The method estimates the relative speed of the base station using the audio arrival times (AATs) of two adjacent positioning cycles and updates the parameters of the reference signal accordingly. The reconstructed reference signal is then used in the audio detection algorithm to obtain a new AAT estimation, which is fed back to update the relative speed estimation. The proposed method improves the tracking accuracy of AIPS and has important application value. Simulation and on-site experiments demonstrate the effectiveness of the method under low noise level.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
