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- W3202804806 abstract "We study the distribution of the matrix product G₁ G₂ ⋯ G_r of r independent Gaussian matrices of various sizes, where G_i is d_{i-1} × d_i, and we denote p = d₀, q = d_r, and require d₁ = d_{r-1}. Here the entries in each G_i are standard normal random variables with mean 0 and variance 1. Such products arise in the study of wireless communication, dynamical systems, and quantum transport, among other places. We show that, provided each d_i, i = 1, …, r, satisfies d_i ≥ C p ⋅ q, where C ≥ C₀ for a constant C₀ > 0 depending on r, then the matrix product G₁ G₂ ⋯ G_r has variation distance at most δ to a p × q matrix G of i.i.d. standard normal random variables with mean 0 and variance ∏_{i = 1}^{r-1} d_i. Here δ → 0 as C → ∞. Moreover, we show a converse for constant r that if d_i 0 depending on C' and r. This converse is best possible when p = Θ(q)." @default.
- W3202804806 created "2021-10-11" @default.
- W3202804806 creator A5024805876 @default.
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- W3202804806 date "2021-08-23" @default.
- W3202804806 modified "2023-09-27" @default.
- W3202804806 title "The Product of Gaussian Matrices is Close to Gaussian" @default.
- W3202804806 doi "https://doi.org/10.4230/lipics.approx/random.2021.35" @default.
- W3202804806 hasPublicationYear "2021" @default.
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