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arXiv 1503.02893cs.ITcs.NAmath.ITmath.NAmath.OCstat.ML
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通过低秩Hankel矩阵重建实现从随机高斯投影中稳健恢复复指数信号

Robust recovery of complex exponential signals from random Gaussian projections via low rank Hankel matrix reconstruction

University of Iowa(爱荷华大学);Xiamen University(厦门大学)

Jian-Feng Cai, Xiaobo Qu, Weiyu Xu, Gui-Bo Ye

AI总结:

本文研究了从少量随机高斯投影中稳健恢复多个复指数函数的信号,通过低秩Hankel矩阵重建,理论证明在投影数量超过O(Rln²N)时可实现稳健恢复,无需不相干或分离条件,适用于频谱压缩感知。

摘要:

本文探讨了从少量随机高斯投影中稳健恢复多个复指数函数的信号。我们假设信号为2N-1维且R<<2N-1,该框架覆盖生物、自动化、成像科学等领域的广泛应用。通过最小化Hankel矩阵的核范数并满足采样数据一致性来重建信号。理论结果表明,只要投影数量超过O(Rln²N),即可实现稳健恢复。无需不相干或分离条件。该方法可应用于频谱压缩感知,相比现有结果,无需频率分离条件,且在测量数量上有更好的或可比的界。此外,该方法为非均匀采样NMR光谱中的采样数量提供了理论指导。通过数值实验进一步验证了算法性能。

英文摘要:

This paper explores robust recovery of a superposition of $R$ distinct complex exponential functions from a few random Gaussian projections. We assume that the signal of interest is of $2N-1$ dimensional and $R<<2N-1$. This framework covers a large class of signals arising from real applications in biology, automation, imaging science, etc. To reconstruct such a signal, our algorithm is to seek a low-rank Hankel matrix of the signal by minimizing its nuclear norm subject to the consistency on the sampled data. Our theoretical results show that a robust recovery is possible as long as the number of projections exceeds $O(R\ln^2N)$. No incoherence or separation condition is required in our proof. Our method can be applied to spectral compressed sensing where the signal of interest is a superposition of $R$ complex sinusoids. Compared to existing results, our result here does not need any separation condition on the frequencies, while achieving better or comparable bounds on the number of measurements. Furthermore, our method provides theoretical guidance on how many samples are required in the state-of-the-art non-uniform sampling in NMR spectroscopy. The performance of our algorithm is further demonstrated by numerical experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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