You know the power of the signal; what is the phase? Griffin-Lim algorithm, Wirtinger flow methods based on Wirtinger calculus, Phase-gradient heap integration (Pru and Søndergaard 2016).
TODO: investigate Yue M Lu’s work on phase retrieval as an important example in a large classe of somewhat- analytically-understood nonconvex problems, starting from his recent slide deck on that theme.
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