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Phase retrieval without small-ball probability assumptions: Recovery guarantees for phaselift

Authors: Felix Krahmer; Yi-Kai Liu;

Phase retrieval without small-ball probability assumptions: Recovery guarantees for phaselift

Abstract

We study the problem of recovering an unknown vector x e Rn from measurements of the form y i = |aT i x|2 (for i = 1,…, m), where the vectors a i e Rn are chosen independently at random, with each coordinate a ij e R being chosen independently from a fixed sub-Gaussian distribution D. However, without making additional assumptions on the random variables a ij — for example on the behavior of their small ball probabilities — it may happen some vectors x cannot be uniquely recovered. We show that for any sub-Gaussian distribution V, with no additional assumptions, it is still possible to recover most vectors x. More precisely, one can recover those vectors x that are not too peaky in the sense that at most a constant fraction of their mass is concentrated on any one coordinate. The recovery guarantees in this paper are for the PhaseLift algorithm, a tractable convex program based on a matrix formulation of the problem. We prove uniform recovery of all not too peaky vectors from m = 0(n) measurements, in the presence of noise. This extends previous work on PhaseLift by Candes and Li [8].

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Powered by OpenAIRE graph
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
2
Average
Average
Average
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