arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1611.02431math.OCcs.MA
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通信约束下联合稀疏信号的分布式恢复

Distributed recovery of jointly sparse signals under communication constraints

Sophie M. Fosson, Javier Matamoros, Carles Anton-Haro, Enrico Magli

摘要:

联合稀疏信号的分布式恢复问题近年来受到广泛关注。让我们假设网络的节点观察具有共同支持的不同稀疏信号;从线性压缩测量开始,并利用网络通信,每个节点的目标是重建其观察信号的支持和非零值。在文献中,分布式贪婪算法已被提出来解决这个问题,其中最可靠的需要大量的传输数据,这几乎不适应现实的网络通信约束。在这项工作中,我们解决了这个问题,通过一个重新加权的$\ell_1$软阈值技术,其中阈值迭代调整的基础上,目前的估计的支持。该方法适用于受限网络,因为它只需要邻居之间的本地通信,并且传输的消息是来自有限集的索引。我们分析证明了所提出的算法的收敛性,我们表明,它优于最先进的贪婪方法在恢复精度和通信负载之间的平衡。

英文摘要:

The problem of the distributed recovery of jointly sparse signals has attracted much attention recently. Let us assume that the nodes of a network observe different sparse signals with common support; starting from linear, compressed measurements, and exploiting network communication, each node aims at reconstructing the support and the non-zero values of its observed signal. In the literature, distributed greedy algorithms have been proposed to tackle this problem, among which the most reliable ones require a large amount of transmitted data, which barely adapts to realistic network communication constraints. In this work, we address the problem through a reweighted $\ell_1$ soft thresholding technique, in which the threshold is iteratively tuned based on the current estimate of the support. The proposed method adapts to constrained networks, as it requires only local communication among neighbors, and the transmitted messages are indices from a finite set. We analytically prove the convergence of the proposed algorithm and we show that it outperforms the state-of-the-art greedy methods in terms of balance between recovery accuracy and communication load.

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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