Abstract
The reconstruction of time-varying signals on graphs is a prominent problem in graph signal processing community. By imposing the smoothness regularization over the time-vertex domain, the reconstruction problem can be formulated into an unconstrained optimization problem that minimizes the weighted sum of the data fidelity term and regularization term. In this paper, we propose an approximate Newton method to solve the problem in a distributed manner, which is applicable for spatially distributed systems consisting of agents with limited computation and communication capacity. The algorithm has low computational complexity while nearly maintains the fast convergence of the second-order methods, which is evidently better than the existing reconstruction algorithm based on the gradient descent method. The convergence of the proposed algorithm is explicitly proved. Numerical results verify the validity and fast convergence of the proposed algorithm.
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Acknowledgements
This work is partially supported by the National Natural Science Foundation of China (Grant Nos. 61761011, 61871303, 62171146), Natural Science Foundation of Guangxi Province (Grant Nos. 2017GXNSFAA198173, 2017GXNSFBA198137).
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Chi, Y., Jiang, J., Zhou, F. et al. A Distributed Algorithm for Reconstructing Time-Varying Graph Signals. Circuits Syst Signal Process 41, 3624–3641 (2022). https://doi.org/10.1007/s00034-021-01930-3
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DOI: https://doi.org/10.1007/s00034-021-01930-3