Joint channel and Doppler estimation for OSDM underwater acoustic communications
Jing Han (Northwestern Polytechnical University)
Sundeep Prabhakar Chepuri (Indian Institute of Science)
G Leus (TU Delft - Signal Processing Systems)
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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.