Multiplicative free Convolution and Information-Plus-Noise Type Matrices

Details Multiplicative free Convolution and Information-Plus-Noise Type Matrices Multiplicative free Convolution and Information-Plus-Noise Type Matrices

2007-02-12

arxiv.org/abs/math/0702342v1

Mathematics

Probability

36 pages. 1 figure

Scientific paper

Free probability and random matrix theory has shown to be a fruitful combination in many fields of research, such as digital communications, nuclear physics and mathematical finance. The link between free probability and eigenvalue distributions of random matrices will be strengthened further in this paper. It will be shown how the concept of multiplicative free convolution can be used to express known results for eigenvalue distributions of a type of random matrices called Information-Plus-Noise matrices. The result is proved in a free probability framework, and some new results, useful for problems related to free probability, are presented in this context. The connection between free probability and estimators for covariance matrices is also made through the notion of free deconvolution.

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