Challenges for efficient communication in underwater acoustic sensor networks
ACM SIGBED Review - Special issue on embedded sensor networks and wireless computing
Signal processing for underwater acoustic communications
IEEE Communications Magazine
Estimation of Multipath Channels With Long Impulse Response at Low SNR via an MCMC Method
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
Sparse Channel Estimation with Zero Tap Detection
IEEE Transactions on Wireless Communications
Optimizing Joint Erasure- and Error-Correction Coding for Wireless Packet Transmissions
IEEE Transactions on Wireless Communications - Part 2
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
Near-Optimal Signal Recovery From Random Projections: Universal Encoding Strategies?
IEEE Transactions on Information Theory
Signal Recovery From Random Measurements Via Orthogonal Matching Pursuit
IEEE Transactions on Information Theory
Guest Editorial - Underwater Wireless Communication Networks
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Iterative Carrier Frequency Offset and Channel Estimation for Underwater Acoustic OFDM Systems
IEEE Journal on Selected Areas in Communications
Multiband OFDM for Covert Acoustic Communications
IEEE Journal on Selected Areas in Communications
Efficient Multicarrier Communication for Highly Spread Underwater Acoustic Channels
IEEE Journal on Selected Areas in Communications
Nonbinary LDPC Coding for Multicarrier Underwater Acoustic Communication
IEEE Journal on Selected Areas in Communications
The challenges of building mobile underwater wireless networks for aquatic applications
IEEE Network: The Magazine of Global Internetworking
OFDM in deep water acoustic channels with extremely long delay spread
Proceedings of the Fifth ACM International Workshop on UnderWater Networks
Application of compressive sensing to sparse channel estimation
IEEE Communications Magazine
Iterative sparse channel estimation and decoding for underwater MIMO-OFDM
EURASIP Journal on Advances in Signal Processing - Special issue on advanced equalization techniques for wireless communications
Sparsity-aware estimation of CDMA system parameters
EURASIP Journal on Advances in Signal Processing - Special issue on advanced equalization techniques for wireless communications
Nonstationary system analysis methods for underwater acoustic communications
EURASIP Journal on Advances in Signal Processing - Special issue on recent advances in theory and methods for nonstationary signal analysis
Proceedings of the Sixth ACM International Workshop on Underwater Networks
Performance comparison of doppler scale estimation methods for underwater acoustic OFDM
Journal of Electrical and Computer Engineering - Special issue on Underwater Communications and Networking
Reducing the overhead of OFDM communications over underwater acoustic channels
Proceedings of the Seventh ACM International Conference on Underwater Networks and Systems
CT-MAC: a MAC protocol for underwater MIMO based network uplink communications
Proceedings of the Seventh ACM International Conference on Underwater Networks and Systems
Information-theoretic analysis of underwater acoustic OFDM systems in highly dispersive channels
Journal of Electrical and Computer Engineering - Special issue on Underwater Communications and Networking
Effective self-cancellation of intercarrier interference for OFDM underwater acoustic communications
Proceedings of the Eighth ACM International Conference on Underwater Networks and Systems
Iterative estimation of the time-varying underwater acoustic channel using basis expansion models
Proceedings of the Eighth ACM International Conference on Underwater Networks and Systems
Tracking time-varying correlated underwater acoustic channels in the signal subspace
Proceedings of the Eighth ACM International Conference on Underwater Networks and Systems
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In this paper, we investigate various channel estimators that exploit channel sparsity in the time and/or Doppler domain for a multicarrier underwater acoustic system. We use a path-based channel model, where the channel is described by a limited number of paths, each characterized by a delay, Doppler scale, and attenuation factor, and derive the exact inter-carrier-interference (ICI) pattern. For channels that have limited Doppler spread we show that subspace algorithms from the array processing literature, namely Root-MUSIC and ESPRIT, can be applied for channel estimation. For channels with Doppler spread, we adopt a compressed sensing approach, in form of Orthogonal Matching Pursuit (OMP) and Basis Pursuit (BP) algorithms, and utilize overcomplete dictionaries with an increased path delay resolution. Numerical simulation and experimental data of an OFDM block-by-block receiver are used to evaluate the proposed algorithms in comparison to the conventional least-squares (LS) channel estimator. We observe that subspace methods can tolerate small to moderate Doppler effects, and outperform the LS approach when the channel is indeed sparse. On the other hand, compressed sensing algorithms uniformly outperform the LS and subspace methods. Coupled with a channel equalizer mitigating ICI, the compressed sensing algorithms can effectively handle channels with significant Doppler spread.