Similarity retrieval mechanisms should utilize generalized quadratic form distance functions as well as the Euclidean distance function since ellipsoid queries parameters may vary with the user and situation. In this paper, we present the spatial transformation technique that yields a new search method for adaptive ellipsoid queries with quadratic form distance functions. The basic idea is to t...

In this work we study the divergence of different links in wide-band multi-user multiple-input multiple-output (MUMIMO) channels. The divergence is measured on several levels: (i) spatial separation of the user’s correlation matrices, (ii) co-linearity of the MIMO channel matrices, and (iii) correlation of large scale fading. The measurement data has been acquired using Eurecom’s MIMO Openair S...