Joint channel and Doppler estimation for OSDM underwater acoustic communications

Journal article (2020)

Authors

Jing Han Northwestern Polytechnical University
Sundeep Prabhakar Chepuri Indian Institute of Science
G.J.T. Leus Signal Processing Systems - EEMCS
Research Group
Signal Processing Systems (EEMCS) (TU Delft)
Copyright: © 2020 Jing Han, Sundeep Prabhakar Chepuri, G.J.T. Leus
DOI: https://doi.org/10.1016/j.sigpro.2019.107446
Channel estimation Doppler estimation OSDM Time-varying channels Underwater acoustic communications
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Published Date

01-05-2020

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Signal Processing Systems

Abstract

Orthogonal signal-division multiplexing (OSDM) has recently emerged as a promising modulation scheme for underwater acoustic communications. Although providing more flexibility in system design, it suffers from a special interference structure over time-varying channels. To enable reliable OSDM equalization, we propose a joint channel impulse response and Doppler estimation algorithm in this paper. Compared to the existing method, which solves a nonconvex bilinear optimization problem iteratively in the frequency domain without a guarantee of global optimality, the proposed algorithm transforms the problem into a convex quadratic minimization in the time domain and can achieve a closed-form solution.