6,036 research outputs found
Modelling the general dependency between directions of arrival and departure for an indoor MIMO channel
Problems with direction finding using linear array with element spacing more than half wavelength
Comparison of MIMO channels from multipath parameter extraction and direct channel measurements
Dynamic spatial-temporal propagation measurement and super-resolution channel characterisation at 5.2 GHz in a corridor environment
Dynamic double directional propagation channel analysis with dual circular arrays
Dynamic double directional propagation channel analysis with dual circular arrays. (pp. 6 p). Peer reviewed versio
On the application of circular arrays in direction finding. Part I: Investigation into the estimation algorithms
Joint detection-estimation of directional channel parameters using the 2-D frequency domain SAGE algorithm with serial interference cancellation
A heterotic sigma model with novel target geometry
We construct a (1,2) heterotic sigma model whose target space geometry
consists of a transitive Lie algebroid with complex structure on a Kaehler
manifold. We show that, under certain geometrical and topological conditions,
there are two distinguished topological half--twists of the heterotic sigma
model leading to A and B type half--topological models. Each of these models is
characterized by the usual topological BRST operator, stemming from the
heterotic (0,2) supersymmetry, and a second BRST operator anticommuting with
the former, originating from the (1,0) supersymmetry. These BRST operators
combined in a certain way provide each half--topological model with two
inequivalent BRST structures and, correspondingly, two distinct perturbative
chiral algebras and chiral rings. The latter are studied in detail and
characterized geometrically in terms of Lie algebroid cohomology in the
quasiclassical limit.Comment: 83 pages, no figures, 2 references adde
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