报告内容： Underwater Acoustic Communications
报告人： 李姜辉博士
报告时间： 2018 年10 月31 日（星期三）上午9:30-11:30
报告地点： 新大楼1002 会议室
召集人： 牛雄伟博士

报告人简介：

           “Dr. Jianghui Li received the B.S. degree from Huazhong University of Science and
Technology, Wuhan, China, in 2011, the M.S. degree from University of York, UK, in 2013, and
the Ph.D. degree from University of York, UK, in 2017.
From 2011 to 2012, he was with the Institute of Electronics, Chinese Academy of Sciences
as a research assistant. He is presently with the Institute of Sound and Vibration Research,
University of Southampton, and National Oceanography Centre, UK, as a research fellow. His research has concerned
underwater acoustic communications, wireless sensor networks, Ocean engineering, and adaptive signal processing.
Dr. Jianghui Li has been a member of IEEE since 2014. He was awarded the first IEEE Oceanic Engineering
Society Scholarship in UK, and the IEEE Signal Processing Society Travel Grant in 2016, the Kathleen Mary Stott
Prize in 2017.
报告摘要：
       In recent years, the demand for underwater acoustic (UWA) communications has motivated extensive
research in a growing number of oceanic applications, e.g., discovery of new resources, marine and
oceanographic research, marine commercial operations, speech transmission between divers, remote
control in off-shore oil industry, scientific data collection from ocean-bottom stations, control of
surface vessels, unmanned or autonomous underwater vehicles (UUVs, AUVs), ocean floor mapping,
pollution monitoring in environmental systems, and so on. Driven by these demands, the utilisation of
underwater communications will likely experience a surge in the near future.
Currently, for employing such wireless communications, three completely different underwater
wireless waves are commonly used, which are: radio waves, optical waves, and acoustic waves. The
radio waves are commonly used for communication in the air, due to their fast-speed propagation and
wide available frequency spectrum as well as their capability of propagation without medium. The
optical waves are commonly used for their small propagation delay and high possible data rates.
However, the radio waves suffer from tremendous attenuation, i.e., require large antennas and high
power for transmission, only over short distances (usually at ranges of just a few metres) underwater.
The optical waves are severely scattered in a few hundred metres in water mediums. Acoustic waves,
on the contrary, are attractive for underwater communications, due to their capability of propagating
over distances as large as hundreds or even thousands of miles.
However, high demands in reliable UWA communication schemes call for more effective techniques,
some of these techniques are being improved, in terms of throughput, performance, and robustness.
Examples can be listed like the development of advanced signal processing algorithms, such as
Doppler estimation and compensation algorithms, and sparse channel estimation algorithms; the
development of direction of arrival (DOA) estimation and beamforming algorithms, such as the
fractional delay beamforming algorithm; the design of adaptive multi-carrier modulation, such as
guard-free orthogonal frequency-division multiplexing (OFDM); and so on.