Patent ID: 8179779
Filing Date: 2012-05-15
Classification: H04L

Abstract:
1. A method for characterizing state information of the propagation channel in a cell having edges adjacent to other cells of a cellular network in which at least three non-overlapping sets U, V, W of pilot signals are defined, comprising: receiving a pilot signal, belonging to the set U, transmitted over a wireless radiofrequency propagation channel from at least one mobile station belonging to the cellular network; and in a processor, deriving information about the propagation channel from the transmitted and received pilot signal using knowledge of the pilot signals in the set U, wherein: in a representation of the pilot signals as vectors, each of the sets U, V, and W consists of mutually orthogonal elements; each of U, V, and W includes at least six peripheral elements and at least three central elements; the six peripheral elements of each set U, V, W are orthogonal to at least three peripheral elements of each of the other two sets; and the received pilot signal is a peripheral element of U if the transmitting mobile station is near an edge of the cell, but is a central element of U if the transmitting mobile station is not near an edge of the cell.