Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compressed Sensing for Sparse Underwater Channel Estimation: Some
  Practical Considerations   We examine the use of a structured thresholding algorithm for sparse
underwater channel estimation using compressed sensing. This method shows some
improvements over standard algorithms for sparse channel estimation such as
matching pursuit, iterative detection and least squares.

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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin