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Modeling and Channel Estimation for Piezo-acoustic Backscatter Assisted underwater acoustic communications

China communications 2022年第11期19卷 297-307页

作者： Junliang Lin Gongpu Wang Zijian Zheng Ruyi Ye Ruisi He Bo Ai School of Computer and Information Technology Beijing Jiaotong UniversityBeijing 100091China School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100091China China National Institute of Standardization Beijing 100088China The State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100091China

Relying on direct and converse piezoelectric effects,piezo-acoustic backscatter(PAB)technology reflects ambient acoustic signals to enable underwater backscatter communications at near-zero power,which was first realized through a *** this paper,we propose a mathematical model of the PAB assisted underwater acoustic(UWA)communication,and address the sparse channel estimation ***,we present a five-stage backscatter process to derive the backscatter coefficient,and propose the channel model for the shallow-water ***,we formulate the shallow-water acoustic channel estimation problem as a sparse vector recovery one according to the compressed sensing theory,and leverage the orthogonal matching pursuit(OMP)algorithm to obtain the channel ***,simulation results are provided to corroborate our proposed studies.

关键词： channel estimation compressed sensing piezo-acoustic backscatter underwater acoustic communications

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Evaluating acoustic communication performance of micro autonomous underwater vehicles in confined spaces

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Frontiers of Information Technology & Electronic Engineering 2018年第8期19卷 1013-1023页

作者： Qiu-yang TAO Yue-hai ZHOU Feng TONG Ai-jun SONG Fumin ZHANG School of Electrical and Computer Engineering Georgia Institute of Technology College of Ocean and Earth Sciences Xiamen University Department of Electrical and Computer Engineering The University of Alabama

Micro-sized autonomous underwater vehicles(μAUVs) are well suited to various applications in confined underwater spaces. acoustic communication is required for many application scenarios of μAUVs to enable data transmission without surfacing. This paper presents the integration of a compact acoustic communication device with a μAUV prototype. Packet reception rate(PRR) and bit error rate(BER) of the acoustic communication link are evaluated in a confined pool environment through experiments while the μAUV is either stationary or *** pinpoint several major factors that impact the communication performance. Experimental results show that the multi-path effect significantly affects the synchronization signals of the communication device. The relative motion between the vehicle and the base station also degrades the communication performance. These results suggest future methods towards improvements.

关键词： Autonomous underwater vehicles underwater acoustic communications Confined water space

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水声FBMC-OQAM通信的时变信道估计与符号检测

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哈尔滨工程大学学报（英文版） 2023年第3期22卷 636-649页

作者：陆雪松江雨林李静萱魏艳涂星滨瞿逢重 Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province Zhoushan 316021China Engineering Research Center of Oceanic Sensing Technology and Equipment Ministry of EducationZhejiang UniversityZhoushan 316021China

Filter bank multicarrier(FBMC)systems with offset quadrature amplitude modulation(OQAM)need long data blocks to achieve high spectral ***,the transmission of long data blocks in underwater acoustic(UWA)communication systems often encounters the challenge of time-varying *** paper proposes a time-varying channel tracking method for short-range high-rate UWA FBMC-OQAM communication ***,a known preamble is used to initialize the channel estimation at the initial time of the signal ***,the estimated channel is applied to detect data symbols at several symbol *** detected data symbols are then reused as new pilots to estimate the next time *** the above steps,the unified transmission matrix model is extended to describe the time-varying channel input-output model in this paper and is used for symbol *** results show that the channel tracking error can be reduced to less than−20 dB when the channel temporal coherence coefficient exceeds 0.75 within one block period of FBMC-OQAM *** with conventional known-pilot-based methods,the proposed method needs lower system overhead while exhibiting similar time-varying channel tracking *** sea trial results further proved the practicability of the proposed method.

关键词： FBMC-OQAM underwater acoustic communications Channel estimation Time-varying channel Data reuse Iterative estimation

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M-ary CDMA multiuser underwater acoustic communication and its experimental results

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Science China(Information Sciences) 2011年第8期54卷 1747-1755页

作者： HE ChengBing 1,HUANG JianGuo 1,YAN ZhengHua 2 & ZHANG QunFei 1 1 College of Marine Engineering,Northwestern Polytechnical University,Xi’an 710072,China 2 China Ship Research and Development Academy,Beijing 100085,China College of Marine Engineering Northwestern Polytechnical University Xi’an China China Ship Research and Development Academy Beijing China

A novel M-ary code division multiple access (M-ary CDMA) underwater acoustic communication (UAC) that utilizes quasi-orthogonal sequences has been proposed for the multiple mobile unmanned underwater vehicle (UUV).Its performance has been verified in both four-user synchronous and three-user asynchronous scenarios through a lake experiment over a very shallow-water *** a chip rate of 2 kilochips per second,good bandwidth efficiency and robust links have been achieved both at 5 and 15 km *** performance of M-ary CDMA in mobile condition (3 m/s) is demonstrated by using the recorded lake experimental data. Experimental results show that the proposed scheme is suitable for multi-user communication platform in long-range shallow-water channel with simple receiver algorithms.

关键词： underwater acoustic communications M-ary code division multiple access (M-ary CDMA) Doppler shift compensation shallow-water acoustic network unmanned underwater vehicle

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Sparse Channel Estimation for underwater acoustic Communication with Doppler Shifts

Sparse Channel Estimation for Underwater Acoustic Communicat...

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2011 IEEE International Conference on Information Theory and Information Security(ICITIS 2011)

作者： Huanan Yu 1) 2) Shuxu Guo 1) 1) College of electronic science and engineering Jilin University Changchun China 2) College of information engineering Northeast Dianli unibersity Changchun China

In this paper, we propose a new type of channel estimator for underwater acoustic （UWA） system using the compressed sensing （CS） theory, which releases the sparse channel estimation from the highly dependence on Doppler compensation. Instead of using various compensation approaches, the proposed index is designed by modeling Doppler shifts as the atoms shifts in over-complete dictionary. From the results, this method improves the mean square error （MSE） performance with lower complexity and hardware cost.

关键词： compressed sensing underwater acoustic communications Doppler spreads over-complete dictionary

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