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arXiv 1102.3220cs.ITcond-mat.dis-nnmath.IT
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一种基于稀疏矩阵的压缩感知信号恢复算法

A signal recovery algorithm for sparse matrix based compressed sensing

Yoshiyuki Kabashima, Tadashi Wadayama

摘要:

基于随机构造的稀疏测量矩阵,提出了一种低计算代价的压缩感知近似信号恢复算法。大数定律和中心极限定理表明,当矩阵密度与信号大小$N$一样大且测量次数$M$趋于无穷大时,该算法饱和了Donoho-Tanner弱阈值,并保持$α=M/N \sim O(1)$不变,这得到了大量数值实验的支持.即使当测量矩阵中每列/行的非零条目的数量被限制为$O(1)$时,数值实验表明,如果信号的非零条目的密度$ρ$低于特定临界值$ρ_{\rm th}(α)$(如$N,M \to \infty$),则该算法通常仍然可以以每次更新的$O(N)$计算成本完美地恢复原始信号。

英文摘要:

We have developed an approximate signal recovery algorithm with low computational cost for compressed sensing on the basis of randomly constructed sparse measurement matrices. The law of large numbers and the central limit theorem suggest that the developed algorithm saturates the Donoho-Tanner weak threshold for the perfect recovery when the matrix becomes as dense as the signal size $N$ and the number of measurements $M$ tends to infinity keep $α=M/N \sim O(1)$, which is supported by extensive numerical experiments. Even when the numbers of non-zero entries per column/row in the measurement matrices are limited to $O(1)$, numerical experiments indicate that the algorithm can still typically recover the original signal perfectly with an $O(N)$ computational cost per update as well if the density $ρ$ of non-zero entries of the signal is lower than a certain critical value $ρ_{\rm th}(α)$ as $N,M \to \infty$.

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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