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arXiv 1002.0110cs.ITmath.IT
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高斯噪声干扰下稀疏向量的无偏估计

On Unbiased Estimation of Sparse Vectors Corrupted by Gaussian Noise

Alexander Jung, Zvika Ben-Haim, Franz Hlawatsch, Yonina C. Eldar

摘要:

我们考虑的稀疏参数向量的估计,由高斯白噪声损坏的测量。我们的重点是无偏估计的设置下,问题的难度可以量化分析。我们证明了存在无穷多个无偏估计,但没有一个具有一致最小均方误差。然后,我们提供Barankin界,它描述了无偏估计器可实现的性能的上下界。这些界限被用来预测阈值区域的实际估计。

英文摘要:

We consider the estimation of a sparse parameter vector from measurements corrupted by white Gaussian noise. Our focus is on unbiased estimation as a setting under which the difficulty of the problem can be quantified analytically. We show that there are infinitely many unbiased estimators but none of them has uniformly minimum mean-squared error. We then provide lower and upper bounds on the Barankin bound, which describes the performance achievable by unbiased estimators. These bounds are used to predict the threshold region of practical estimators.

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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