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arXiv 1204.5136cs.ITmath.IT
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压缩感知中基于节点验证的恢复算法的不规则图分析与设计

Analysis and Design of Irregular Graphs for Node-Based Verification-Based Recovery Algorithms in Compressed Sensing

Yaser Eftekhari, Amir H. Banihashemi, Ioannis Lambadaris

摘要:

在本文中,我们提出了一个概率分析的迭代节点为基础的验证为基础的(NB-VB)恢复算法在不规则图的压缩感知的背景下。基于验证的算法由于其低复杂度(在信号维度$n$中是线性的)而特别令人感兴趣。该分析预测在每次迭代$\ell$处未验证的信号元素的平均分数,其中在输入信号和感测矩阵的集合上取平均值。该分析是渐近的($n \rightarrow \infty$),并且在性质上类似于通常用于分析迭代解码算法的众所周知的密度演化技术。与现有的NB-VB算法分析技术相比,该方法是基于数值求解一个大的耦合微分方程组,所提出的方法是更简单,更准确。这使我们能够为这种恢复算法设计不规则的感知图。所设计的不规则图的性能大大优于相应的规则图。例如,对于每次迭代相同的恢复复杂度,我们设计了不规则图,与规则图相比,它可以恢复多达40%的非零信号元素。仿真结果也表明,所提出的渐近分析相匹配的性能恢复算法的大,但有限值的$n$。

英文摘要:

In this paper, we present a probabilistic analysis of iterative node-based verification-based (NB-VB) recovery algorithms over irregular graphs in the context of compressed sensing. Verification-based algorithms are particularly interesting due to their low complexity (linear in the signal dimension $n$). The analysis predicts the average fraction of unverified signal elements at each iteration $\ell$ where the average is taken over the ensembles of input signals and sensing matrices. The analysis is asymptotic ($n \rightarrow \infty$) and is similar in nature to the well-known density evolution technique commonly used to analyze iterative decoding algorithms. Compared to the existing technique for the analysis of NB-VB algorithms, which is based on numerically solving a large system of coupled differential equations, the proposed method is much simpler and more accurate. This allows us to design irregular sensing graphs for such recovery algorithms. The designed irregular graphs outperform the corresponding regular graphs substantially. For example, for the same recovery complexity per iteration, we design irregular graphs that can recover up to about 40% more non-zero signal elements compared to the regular graphs. Simulation results are also provided which demonstrate that the proposed asymptotic analysis matches the performance of recovery algorithms for large but finite values of $n$.

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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