Remarks on the Spatial Smoothing Step in Coarray MUSIC

Sparse arrays such as nested and coprime arrays use a technique called spatial smoothing in order to successfully perform MUSIC in the difference-coarray domain. In this paper it is shown that the spatial smoothing step is not necessary in the sense that the effect achieved by that step can be obtai...

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Bibliographic Details
Published inIEEE signal processing letters Vol. 22; no. 9; pp. 1438 - 1442
Main Authors Chun-Lin Liu, Vaidyanathan, P. P.
Format Journal Article
LanguageEnglish
Published IEEE 01.09.2015
Subjects
Array signal processing
Arrays
Coprime arrays
Direction-of-arrival estimation
Multiple signal classification
nested arrays
Smoothing methods
sparse arrays
Sparse matrices
spatial smoothing
Vectors
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Summary:Sparse arrays such as nested and coprime arrays use a technique called spatial smoothing in order to successfully perform MUSIC in the difference-coarray domain. In this paper it is shown that the spatial smoothing step is not necessary in the sense that the effect achieved by that step can be obtained more directly. In particular, with R̃ ss denoting the spatial smoothed matrix with finite snapshots, it is shown here that the noise eigenspace of this matrix can be directly obtained from another matrix R̃ which is much easier to compute from data.
ISSN:1070-9908
1558-2361
DOI:10.1109/LSP.2015.2409153