Patent ID: 8737339
Filing Date: 2014-05-27
Classification: H04B

Abstract:
1. A method of improving handling of two data streams sent in downlink data communication channels to a user equipment via a first and a second cell of a wireless communication network, the method being performed by an antenna weight determining device and comprising: processing data obtained in relation to communication signals sent between at least one of the cells and the user equipment, said processing comprising estimating data communication channels between the second cell and the user equipment and the first cell and the user equipment, wherein said estimating comprises estimating uplink data communication channels associated with the downlink data communication channels through obtaining the covariance between signals received by antennas of the first and second cells, creating a covariance matrix R, and performing an eigenvalue decomposition of the covariance matrix into a unitary matrix U and a diagonal matrix S; and determining an antenna weight to be applied by the second cell based on said processing, wherein said determining the antenna weight comprises comparing power differences of the diagonal elements of the diagonal matrix, selecting a diagonal element and selecting a pre-coding vector in the unitary matrix corresponding to the selected diagonal element of the diagonal matrix as a weight to be applied by the second cell in downlink.