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arXiv 1306.6815cs.ITmath.IT
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分布式贪婪追踪算法

Distributed Greedy Pursuit Algorithms

Dennis Sundman, Saikat Chatterjee, Mikael Skoglund

摘要:

对于任意连接网络上的压缩感知,我们考虑以分布式方式估计底层稀疏信号的问题。我们引入了一个新的信号模型,有助于描述连接的节点之间的信号间的相关性。基于这个信号模型,以及现有的贪心算法的简要调查,我们开发了分布式贪心算法与低通信开销。在对现有的正交匹配追踪和子空间追踪算法进行适当修改的基础上,设计了两种新的分布式算法。此外,通过结合这两个本地算法的优点,我们设计了一个新的贪心算法,非常适合于分布式场景。通过大量的模拟,我们证明了新的算法在稀疏连接的网络提供了良好的性能,接近集中式贪婪解决方案的性能。

英文摘要:

For compressed sensing over arbitrarily connected networks, we consider the problem of estimating underlying sparse signals in a distributed manner. We introduce a new signal model that helps to describe inter-signal correlation among connected nodes. Based on this signal model along with a brief survey of existing greedy algorithms, we develop distributed greedy algorithms with low communication overhead. Incorporating appropriate modifications, we design two new distributed algorithms where the local algorithms are based on appropriately modified existing orthogonal matching pursuit and subspace pursuit. Further, by combining advantages of these two local algorithms, we design a new greedy algorithm that is well suited for a distributed scenario. By extensive simulations we demonstrate that the new algorithms in a sparsely connected network provide good performance, close to the performance of a centralized greedy solution.

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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