Kai Tu
Arizona State University
5 Papers
Kai Tu is an academic researcher from Arizona State University. The author has contributed to research in topics: Underwater acoustic communication & Orthogonal frequency-division multiplexing. The author has an hindex of 5, co-authored 5 publications.
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Papers
Mitigation of Intercarrier Interference for OFDM Over Time-Varying Underwater Acoustic Channels
TL;DR: In this paper, two ICI-mitigation schemes are proposed for cyclic-prefixed OFDM over time-varying UWA channels. But the ICI coefficients are not explicitly estimated, and no explicit ICI estimation is performed, and detection is based on an adaptive decision-feedback equalizer applied in the frequency domain across adjacent subcarriers.
Multiple-Resampling Receiver Design for OFDM Over Doppler-Distorted Underwater Acoustic Channels
TL;DR: This paper proposes a family of front-end receiver structures that utilize multiple-resampling (MR) branches, each matched to the Doppler scaling factor of a particular user and/or path, and proposes a gradient-descent approach to refine the channel estimates obtained by standard sparse channel estimators.
Mitigation of intercarrier interference in OFDM systems over underwater acoustic channels
Kai Tu,Dario Fertonani,Tolga M. Duman,Paul Hursky +3 more
- 11 May 2009
TL;DR: In this paper, the ICI coefficients are explicitly estimated, and minimum mean square error (MMSE) equalization based on such estimates is performed, and detection is based on an adaptive decision-feedback equalizer (DFE) applied in the frequency domain across different subcarriers.
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OFDMA for underwater acoustic communications
Kai Tu,Tolga M. Duman,Milica Stojanovic,John G. Proakis +3 more
- 01 Sep 2011
TL;DR: A unique OFDMA receiver front end is developed, which enables compensation of each user-specific Doppler by means of multiple resampling branches, and investigates two subcarrier allocation schemes, namely the contiguous carrier assignment, and the interleaved carrier assignment schemes.
Cooperative MIMO-OFDM communications: Receiver design for Doppler-distorted underwater acoustic channels
Kai Tu,Tolga M. Duman,John G. Proakis,Milica Stojanovic +3 more
- 01 Nov 2010
TL;DR: A front-end receiver structure that utilizes multiple resampling branches, each followed by FFT demodulation is proposed, illustrating significant performance improvements as compared to the conventional, single-resampling schemes.