Comparison of MIMO channels from multipath parameter extraction and direct channel measurements

This work presents a MIMO throughput performance analysis of dynamic wideband double-directional channel measurements that were recently obtained by the University of Bristol. Identical 16-element uniform circular arrays (UCAs) were employed at both ends of the link and the parameters of the multipath components (MFCs) were extracted. In this paper, the performance analyses of several 4/spl times/4 subarrays of the 16/spl times/16 measurement arrays are presented. The MIMO response of these channels was synthesised from the extracted MFCs. A comparison is then made between the capacity estimates from the directly measured and synthesised MIMO channels. This was found to show good agreementThis work presents a MIMO throughput performance analysis of dynamic wideband double-directional channel measurements that were recently obtained by the University of Bristol. Identical 16-element uniform circular arrays (UCAs) were employed at both ends of the link and the parameters of the multipath components (MFCs) were extracted. In this paper, the performance analyses of several 4/spl times/4 subarrays of the 16/spl times/16 measurement arrays are presented. The MIMO response of these channels was synthesised from the extracted MFCs. A comparison is then made between the capacity estimates from the directly measured and synthesised MIMO channels. This was found to show good agreemen

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

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