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CoSaMP: Iterative signal recovery from incomplete and inaccurate samples. (English) Zbl 1163.94003
Summary: Compressive sampling offers a new paradigm for acquiring signals that are compressible with respect to an orthonormal basis. The major algorithmic challenge in compressive sampling is to approximate a compressible signal from noisy samples. This paper describes a new iterative recovery algorithm called CoSaMP that delivers the same guarantees as the best optimization-based approaches. Moreover, this algorithm offers rigorous bounds on computational cost and storage. It is likely to be extremely efficient for practical problems because it requires only matrix-vector multiplies with the sampling matrix. For compressible signals, the running time is just O(Nlog 2 N), where N is the length of the signal.
MSC:
94A12Signal theory (characterization, reconstruction, filtering, etc.)
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