Bounds for Packings of Spheres in the Grassmann Manifolds
Authors: A. Barg, D. Nogin
ABSTRACT
We derive the Varshamov--Gilbert and Hamming bounds for
packings of spheres (codes) in the Grassmann manifolds over
$\mathbb R$ and $\mathbb C$. The distance between two $k$-planes
is defined as
$\rho(p,q)=(\sin^2\theta_1+\dots+\sin^2\theta_k)^{1/2}$,
where $\theta_i, 1\le i\le k$, are the principal angles between $p$ and $q$.
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