On the complexity of sphere decoding in digital communications
IEEE Transactions on Signal Processing
Max-SINR ISI/ICI-Shaping Multicarrier Communication Over the Doubly Dispersive Channel
IEEE Transactions on Signal Processing
Orthogonal time-frequency signaling over doubly dispersive channels
IEEE Transactions on Information Theory
Nonorthogonal pulseshapes for multicarrier communications in doubly dispersive channels
IEEE Journal on Selected Areas in Communications
On efficient channel estimation for underwater acoustic OFDM systems
Proceedings of the Fourth ACM International Workshop on UnderWater Networks
An underwater acoustic implementation of DFT-spread OFDM
EURASIP Journal on Advances in Signal Processing - Special issue on advances in signal processing for maritime applications
Proceedings of the 8th ACM international workshop on Mobility management and wireless access
Optimal Bayesian resampling for OFDM signaling over multi-scale multi-lag channels
Proceedings of the Seventh ACM International Conference on Underwater Networks and Systems
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In this paper we propose a novel method for communication over underwater acoustic channels for which the product of delay-spread and Doppler-spread is large, such as those pertaining to the surf zone. In particular, we propose the use of pulse-shaped multicarrier modulation to convert the doubly dispersive channel into an inter-carrier interference (ICI) channel with small ICI spread. We then propose a novel joint ICI-estimation/data-detection strategy which performs near optimally yet at low complexity, due to the use of an efficient tree search algorithm and the ability to leverage sparseness in the delay-power profile. The delay-power profile, which itself varies in time, can be readily tracked via pilots. Numerical simulations show that our technique gives performance close to genie-aided bounds over highly spread channels.