Communications and Networking in Underwater Acoustic Networked Systems

170 Pages·2013·1.35 MB·English

by  Zhaohui Wang

University of Connecticut
OpenCommons@UConn
Doctoral Dissertations University of Connecticut Graduate School
6-24-2013
Communications and Networking in Underwater
Acoustic Networked Systems
Zhaohui Wang
[email protected]
Follow this and additional works at:https://opencommons.uconn.edu/dissertations
Recommended Citation
Wang, Zhaohui, "Communications and Networking in Underwater Acoustic Networked Systems" (2013).Doctoral Dissertations. 134.
https://opencommons.uconn.edu/dissertations/134
Communications and Networking in Underwater Acoustic Networked
Systems
Zhaohui Wang, Ph.D.
University of Connecticut, 2013
The Earth is mostly a water planet, with two thirds of its surface covered
by water. Exploration of the mysterious water world has never ceased in human
history, yet at the time being, less than one percent of this environment has been
explored, since it cannot be probed through satellites nor visited by humans for
a long time. Driven by the unprecedented development of wireless communica-
tions and networking in terrestrial radio applications, underwater wireless net-
worked systems, especially underwater acoustic (UWA) networked systems, are
envisioned to revolutionize underwater exploration through providing long-term,
continuous and real-time unmanned data acquisition. Nevertheless, a plethora of
research issues associated with the UWA networked system have to be identified
and addressed before meeting its great potential. Out of a myriad of challenges,
UWA communications and networking are the most important components that
underpin the system architecture.
This thesis aims to identify and address challenges in practical acoustic net-
workedsystems. Tailoredtotheorthogonalfrequency-divisionmultiplexing(OFDM)
modulation, three research directions are pursued:
Zhaohui Wang––University of Connecticut, 2013
Communication techniques for UWA channels with widely separated mul-
•
tipath clusters: This type of channel exists in many scenarios, such as
the deep-sea horizontal communications and underwater broadcasting net-
works. Due to the extremely large delay spread and time variation of UWA
channels, both interblock and intercarrier interferences are present in the
received signal. Advanced receiver processing algorithms are investigated
to address the above interferences and recover the transmitted information.
External interference cancellation in UWA OFDM: Despite rich interfer-
•
ence in UWA environments, few studies are available for interference miti-
gation in UWA communications and networking. In this vein, we propose
a parameterized interference cancellation approach to mitigate an external
interference from OFDM transmissions, which is shown applicable to other
kinds of interferences in UWA networked systems.
Asynchronous multiuser OFDM reception: Multiuser communication is an
•
effective methodology to increase spectral efficiency. Due to the large
signal propagation delay in water, signals from multiple users could be
severely misaligned at receivers. By introducing the concepts of overlapped
truncation and interference aggregation, we convert the asynchronous mul-
tiuser problem to a quasi-synchronous multiuser problem with interference
contamination, which therefore can be solved through a traditional quasi-
synchronous multiuser receiver equipped with interference cancellation.
Zhaohui Wang––University of Connecticut, 2013
Proposed solutions in the above research directions are validated using both sim-
ulated and field experimental data sets.
Communications and Networking in Underwater Acoustic Networked
Systems
Zhaohui Wang
B.S., Beijing University of Chemical Technology, Beijing, China, 2006
M.S., Graduate University, Chinese Academy of Sciences, Beijing, China, 2009
A Dissertation
Submitted in Partial Fulfillment of the
Requirements for the Degree of
Doctor of Philosophy
at the
University of Connecticut
2013
Copyright by
Zhaohui Wang
2013

To my parents
iii
ACKNOWLEDGEMENTS
I would like to express my heartfelt gratitude to my major advisor, Professor
ShengliZhou, whohasbeenamentor, colleagueandfriend. Hisguidance, support
and encouragement have made this a thoughtful and rewarding journey. His
sharp insight, clear mindset and down-to-earth attitude toward research have set
anexample ofacademicperfection, fromwhich Iwill continue tobenefit infuture.
I would like to thank Professor Peter K. Willett, Professor Yaakov Bar-
Shalom, Professor Jun-Hong Cui, Professor Krishna Pattipati, Professor Peter
Luh, Professor Bing Wang and Professor Zhijie Shi for their excellent guidance
over the years. It was my great pleasure working with such intelligent and inspi-
rational professors. I would like to thank Professor Zhengdao Wang from Iowa
State University for his valuable suggestions on my work. I would like to thank
Dr. Josko Catipovic from the Navy Undersea Warfare Center for insightful dis-
cussions on research problems and his help on collecting experimental data sets
from the AUTEC environment. I would like to thank Dr. James Preisig, Mr. Lee
Freitag and their teams from the Woods Hole Oceanographic Institution for their
help on experimental data collection. I would also like to thank Dr. Jianzhong
Huang, Dr. Jie Huang, Dr. Xiufeng Song, Dr. Ramona Georgescu, and Dr. Chris-
tian R. Berger for their help on my research.
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I would like to extend my gratitude to my colleagues, Lei Wan, Yi Huang,
Sora Choi, Xiaoka Xu, Hao Zhou, Patrick Carroll, Jun Liu, Yibo Zhu, Haining
Mo, Lina Pu, Yu Luo, Li Wei, Huizhong Gao, Yougan Chen, Haixin Sun, Yuzhi
Zhang, Shuo Zhang, Xin Tian, Ting Yuan, Djedjiga Belfadel, David Crouse and
Dave Zhao for their support, feedback, and friendship.
Last but not least, I give my deepest gratitude to my parents, Yongcheng
Wang and Jiuqin Sun, and my brother Lei Wang for their love, understanding,
support and encouragement, and for letting me pursue my dreams far fromhome.
They have been my continuous inspiration to accomplish my doctorate program.
To my family, I dedicate this dissertation.
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