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Published on Mar 1, 2016in Physical Communication 1.45
Xingyu Cai1
Estimated H-index: 1
(UConn: University of Connecticut),
Lei Wan8
Estimated H-index: 8
+ 2 AuthorsZhijie Shi19
Estimated H-index: 19
(UConn: University of Connecticut)
Multicarrier M -ary frequency shift keying (MFSK), a parallel transmission of multiple MFSK data streams, is one basic reference scheme for underwater acoustic communications due to low-complexity incoherent processing at the receiver and ease of implementation. In this paper, we provide some further results for multicarrier MFSK based on the recent development of coherent orthogonal frequency division multiplexing (OFDM) schemes. Specifically, we adopt an OFDM based representation, develop a re...
Published on Oct 15, 2015in Iet Communications 1.78
Youwen Zhang3
Estimated H-index: 3
(HEU: Harbin Engineering University),
Lu Liu3
Estimated H-index: 3
(HEU: Harbin Engineering University)
+ 1 AuthorsHongyu Cui2
Estimated H-index: 2
(HEU: Harbin Engineering University)
In this study, the authors propose a novel decision feedback equaliser (DFE)-based receiver, which combines channel shortening methods and dichotomous coordinate descent (DCD) recursive least squares (RLS) adaptive algorithm with variable forgetting factor (VFF). The proposed receiver can obtain its performance gain via two aspects: (i) reducing the computing complexity by channel shortening method, such as passive time reversal (pTR) filter or minimised mean-square error (MMSE) filter and (ii) ...
Published on Oct 1, 2015 in OCEANS (OCEANS Conference)
Qin Lu2
Estimated H-index: 2
(UConn: University of Connecticut),
Yi Huang6
Estimated H-index: 6
(UConn: University of Connecticut)
+ 1 AuthorsShengli Zhou52
Estimated H-index: 52
(UConn: University of Connecticut)
A time-varying underwater acoustic channel consists of multiple propagation paths which could have drastically distinct Doppler scaling factors. For example, in a communication scenario with mobile nodes, some paths might experience positive Doppler scales while others have negative Doppler scales, leading to a large Doppler spread. In this work, we address two issues. First, we quantify the channel Doppler spread of an underwater acoustic channel based on the instantaneous channel estimate from...
Published on Apr 29, 2015in Iet Communications 1.78
Joonsuk Kim2
Estimated H-index: 2
(Yonsei University),
Il-Suek Koh12
Estimated H-index: 12
(IIT: Inha University),
Yongshik Lee14
Estimated H-index: 14
(Yonsei University)
A short-term fading model based on rough surface theory is proposed to estimate stochastic characteristics of signals reflected by time-varying ocean surfaces in underwater acoustic channels. With this method, probability density functions of the fluctuations in the propagation delay and magnitude, and the Doppler spectral densities are provided with respect to wind speeds. After conducting several experiments and verifying them by comparing with the measurements, it is shown that the model accu...
Published on Apr 1, 2015in IEEE Journal of Oceanic Engineering 2.57
Yashar M. Aval3
Estimated H-index: 3
(NU: Northeastern University),
Milica Stojanovic51
Estimated H-index: 51
(NU: Northeastern University)
In this paper, we propose a class of methods for compensating for the Doppler distortions of the underwater acoustic channel for differentially coherent detection of orthogonal frequency-division multiplexing (OFDM) signals. These methods are based on multiple fast Fourier transform (FFT) demodulation, and are implemented as partial (P), shaped (S), fractional (F), and Taylor (T) series expansion FFT demodulation. They replace the conventional FFT demodulation with a few FFTs and a combiner. The...
Published on Feb 1, 2015
Prashant Kumar7
Estimated H-index: 7
(IITP: Indian Institute of Technology Patna),
Vinay Kumar Trivedi2
Estimated H-index: 2
(IITP: Indian Institute of Technology Patna),
Preetam Kumar9
Estimated H-index: 9
(IITP: Indian Institute of Technology Patna)
Underwater acoustic communication is essential in applications like remote control in the offshore oil industry, pollution monitoring in environmental systems, collection of scientific data recorded at ocean-bottom stations, disaster detection and early warning and underwater surveillance. Research on underwater wireless communication techniques plays a vital role in further exploring oceans and other marine environments. There has been an extensive growth in the volume of literature for underwa...
Published on Mar 5, 2013in Iet Communications 1.78
Ping Wang3
Estimated H-index: 3
(THU: Tsinghua University),
Lin Zhang14
Estimated H-index: 14
(THU: Tsinghua University),
Victor O. K. Li44
Estimated H-index: 44
(HKU: University of Hong Kong)
Although the techniques of cooperative transmission have been developed for terrestrial sensor networks in recent years to improve the bit-error-rate (BER) performance, the unique characteristics of the underwater acoustic communication channel, such as large and variable propagation delay and the three-dimensional network topology, make it necessary to reconsider the implementation and analysis of cooperative transmission in underwater acoustic networks. In this study, two asynchronous forwardi...
Published on Jan 1, 2012in Iet Communications 1.78
Sudip Misra33
Estimated H-index: 33
(IIT-KGP: Indian Institute of Technology Kharagpur),
Suraj Dash1
Estimated H-index: 1
(IIT-KGP: Indian Institute of Technology Kharagpur)
+ 2 AuthorsMohammad S. Obaidat30
Estimated H-index: 30
(Monmouth University)
Underwater sensor networks (UWSNs) can be deployed for sensing the environment in oceanographic columns and other water bodies in which they are deployed. The peculiar characteristic of the underwater medium, coupled with the queer nature of the sound waves in water, poses an enigmatic problem for UWSN researchers. In this study, the authors focus on the problem of UWSN jamming, which is a popular type of denial-of-service attack. The existing jamming detection solutions for sensor networks are ...
Published on Mar 4, 2011in Iet Communications 1.78
Azizollah Jamshidi4
Estimated H-index: 4
(Shiraz University)
Owing to multiple access capability, low probability of intercept and immunity against inter symbol interference (ISI) caused by multipath propagation, direct sequence spread spectrum (DSSS) techniques have been utilised in both underwater acoustic (UWA) communication networks and reliable point-to-point communications. To overcome the severe impact of ISI in the UWA channels, we propose a novel multiple pseudo noise (PN) sequence DSSS scheme and analyse its performance in sparse time varying UW...
Published on Jan 1, 2011in Iet Signal Processing 1.75
Chenhao Qi12
Estimated H-index: 12
(SEU: Southeast University),
Xiaodong Wang59
Estimated H-index: 59
(Columbia University),
Lenan Wu29
Estimated H-index: 29
(SEU: Southeast University)
The authors consider underwater acoustic (UWA) channel estimation based on sparse recovery using the recently developed homotopy algorithm. The UWA communication system under consideration employs orthogonal frequency-division multiplexing (OFDM) and receiver preprocessing to compensate for the Doppler effect before channel estimation. The authors first extend the original homotopy algorithm which is for real-valued signals to the complex field. The authors then propose two enhancements to the s...
Cited By1
Abdel-Mehsen Ahmad1
Estimated H-index: 1
(International University, Cambodia),
Michel Barbeau21
Estimated H-index: 21
+ -3 AuthorsEvangelos Kranakis38
Estimated H-index: 38
Published on May 1, 2019in Applied Acoustics 2.30
Gang Qiao5
Estimated H-index: 5
(HEU: Harbin Engineering University),
Gang Qiao1
Estimated H-index: 1
(HEU: Harbin Engineering University)
+ 1 AuthorsLei Wan8
Estimated H-index: 8
(HEU: Harbin Engineering University)
Abstract In this paper, we propose a low-complexity Orthogonal Matching Pursuit (OMP) based channel estimation method in underwater acoustic (UWA) orthogonal frequency division multiplexing (OFDM) system, where the channel is time-varying and described by a limited number of paths, each characterized by path delay, path gain and path Doppler scale. In the proposed method, we calculate the candidate path signature Hermitian inner product matrix in advance, avoiding the repeated calculations at ea...