## Wednesday, January 21, 2015

### BlockPR: Fast Phase Retrieval for High-Dimensions - implementation -

Fast Phase Retrieval for High-Dimensions by Mark Iwen, Aditya Viswanathan, Yang Wang

We develop a fast phase retrieval method which is near-linear time, making it computationally feasible for large dimensional signals. Both theoretical and experimental results demonstrate the method's speed, accuracy, and robustness. We then use this new phase retrieval method to help establish the first known sublinear-time compressive phase retrieval algorithm capable of recovering a given $s$-sparse vector $\mathbf x \in \mathbb{C}^d$ (up to an unknown phase factor) in just $\mathcal{O}(s \log^5 s \cdot \log d)$-time using only $\mathcal{O}(s \log^4 s \cdot \log d)$ magnitude measurements.
An implementation of BlockPR is here.

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