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arXiv 1406.5231math.OCstat.AP
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基于交替凸搜索的谐波信号恢复基失配抑制

Reducing Basis Mismatch in Harmonic Signal Recovery via Alternating Convex Search

Jonathan M. Nichols, Albert K. Oh, Rebecca M. Willett

摘要:

压缩采样背后的理论预先假定给定的观测序列可以由少量基向量的线性组合精确地表示。然而,在实践中,即使是与精确信号模型的微小偏差也会导致估计误差的急剧增加;这就是所谓的“基础失配”问题。这项工作提供了一个可能的解决方案,这个问题的形式,迭代,双凸搜索算法。该方法使用标准的$\ell_1$ -最小化来找到信号模型系数,随后是信号模型的最大似然估计。该算法的谐波信号的稀疏性变化,并优于目前的最先进的。

英文摘要:

The theory behind compressive sampling pre-supposes that a given sequence of observations may be exactly represented by a linear combination of a small number of basis vectors. In practice, however, even small deviations from an exact signal model can result in dramatic increases in estimation error; this is the so-called "basis mismatch" problem. This work provides one possible solution to this problem in the form of an iterative, biconvex search algorithm. The approach uses standard $\ell_1$-minimization to find the signal model coefficients followed by a maximum likelihood estimate of the signal model. The algorithm is illustrated on harmonic signals of varying sparsity and outperforms the current state-of-the-art.

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