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Asymptotic Behavior of Random Vandermonde Matrices With Entries on the Unit Circle

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2 Author(s)
Ryan, Oyvind ; Centre of Math. for Applic., Univ. of Oslo, Oslo ; Debbah, M.

Analytical methods for finding moments of random Vandermonde matrices with entries on the unit circle are developed. Vandermonde matrices play an important role in signal processing and wireless applications such as direction of arrival estimation, precoding, and sparse sampling theory, just to name a few. Within this framework, we extend classical freeness results on random matrices with independent and identically distributed (i.i.d.) entries and show that Vandermonde structured matrices can be treated in the same vein with different tools. We focus on various types of matrices, such as Vandermonde matrices with and without uniform phase distributions, as well as generalized Vandermonde matrices. In each case, we provide explicit expressions of the moments of the associated Gram matrix, as well as more advanced models involving the Vandermonde matrix. Comparisons with classical i.i.d. random matrix theory are provided, and deconvolution results are discussed. We review some applications of the results to the fields of signal processing and wireless communications.

Published in:

Information Theory, IEEE Transactions on  (Volume:55 ,  Issue: 7 )

Date of Publication:

July 2009

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