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arXiv 0812.4627cs.ITmath.IT
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基于置信传播的贝叶斯压缩感知

Bayesian Compressive Sensing via Belief Propagation

Dror Baron, Shriram Sarvotham, Richard G. Baraniuk

摘要:

压缩感知(CS)是一个新兴的领域,基于稀疏信号的线性投影的小集合包含足够的信息用于稳定的亚奈奎斯特信号采集的启示。当信号的统计特性可用时,贝叶斯推断可以补充基于线性规划或贪心算法的常规CS方法。我们使用置信传播(BP)解码,它表示的CS编码矩阵作为一个图形模型进行近似贝叶斯推理。通过稀疏编码矩阵减少图形模型的大小,获得快速计算。为了解码包含K个大系数的长度为N的信号,我们的CS-BP解码算法使用O(Klog(N))测量和O(Nlog^2(N))计算。最后,虽然我们专注于两状态混合高斯模型,CS-BP很容易适应其他信号模型。

英文摘要:

Compressive sensing (CS) is an emerging field based on the revelation that a small collection of linear projections of a sparse signal contains enough information for stable, sub-Nyquist signal acquisition. When a statistical characterization of the signal is available, Bayesian inference can complement conventional CS methods based on linear programming or greedy algorithms. We perform approximate Bayesian inference using belief propagation (BP) decoding, which represents the CS encoding matrix as a graphical model. Fast computation is obtained by reducing the size of the graphical model with sparse encoding matrices. To decode a length-N signal containing K large coefficients, our CS-BP decoding algorithm uses O(Klog(N)) measurements and O(Nlog^2(N)) computation. Finally, although we focus on a two-state mixture Gaussian model, CS-BP is easily adapted to other signal models.

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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