Abstract
We address the problem of recovering an n-vector from m linear measurements lacking sign or phase information. We show that lifting and semidefinite relaxation suffice by themselves for stable recovery in the setting of m=O(nlogn) random sensing vectors, with high probability. The recovery method is optimizationless in the sense that trace minimization in the PhaseLift procedure is unnecessary. That is, PhaseLift reduces to a feasibility problem. The optimizationless perspective allows for a Douglas-Rachford numerical algorithm that is unavailable for PhaseLift. This method exhibits linear convergence with a favorable convergence rate and without any parameter tuning.
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Acknowledgements
The authors acknowledge generous funding from the National Science Foundation, the Alfred P. Sloan Foundation, TOTAL S.A., and the Air Force Office of Scientific Research. The authors would also like to thank Xiangxiong Zhang for helpful discussions.
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Communicated by Peter Casazza.
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Demanet, L., Hand, P. Stable Optimizationless Recovery from Phaseless Linear Measurements. J Fourier Anal Appl 20, 199–221 (2014). https://doi.org/10.1007/s00041-013-9305-2
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DOI: https://doi.org/10.1007/s00041-013-9305-2