arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1102.2928cs.ITmath.IT
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压缩感知中基于节点验证算法的密度演化分析

Density Evolution Analysis of Node-Based Verification-Based Algorithms in Compressed Sensing

Yaser Eftekhari, Anoosheh Heidarzadeh, Amir H. Banihashemi, Ioannis Lambadaris

摘要:

在本文中,我们提出了一种新的方法来分析迭代节点为基础的验证为基础的(NB-VB)恢复算法的压缩感知的背景下。这些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。渐近分析预测在渐近状态中的每次迭代$\ell$处未验证的信号元素的分数,其中$n \rightarrow \infty$。该分析在本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。为了执行分析,提供了NB-VB算法的消息传递解释。这种解释缺乏标准的信息传递算法,密度进化通常适用于外在的性质。这需要在分析中进行一些重要的修改。该分析跟踪恢复算法在输入信号和感测矩阵集合上的平均性能,作为$\ell$的函数。浓度结果的设计表明,恢复算法的性能适用于任何选择的输入信号超过任何实现的传感矩阵如下的确定性分析的结果密切。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$n$。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。

英文摘要:

In this paper, we present a new approach for the analysis of iterative node-based verification-based (NB-VB) recovery algorithms in the context of compressive sensing. These algorithms are particularly interesting due to their low complexity (linear in the signal dimension $n$). The asymptotic analysis predicts the fraction of unverified signal elements at each iteration $\ell$ in the asymptotic regime where $n \rightarrow \infty$. The analysis is similar in nature to the well-known density evolution technique commonly used to analyze iterative decoding algorithms. To perform the analysis, a message-passing interpretation of NB-VB algorithms is provided. This interpretation lacks the extrinsic nature of standard message-passing algorithms to which density evolution is usually applied. This requires a number of non-trivial modifications in the analysis. The analysis tracks the average performance of the recovery algorithms over the ensembles of input signals and sensing matrices as a function of $\ell$. Concentration results are devised to demonstrate that the performance of the recovery algorithms applied to any choice of the input signal over any realization of the sensing matrix follows the deterministic results of the analysis closely. Simulation results are also provided which demonstrate that the proposed asymptotic analysis matches the performance of recovery algorithms for large but finite values of $n$. 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.

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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