Patent ID: 9143217
Filing Date: 2015-09-22
Classification: H04B,H04L

Abstract:
1. Method in a transmitting node in a wireless communication system for determining at least one phase affecting error related to transmission from at least one pair of correlated antennas comprising a first and a second antenna, the method comprising: transmitting reference signals from the correlated first and second antennas in the at least one pair, in a set of frequency bands, wherein a number of controlled phase differences are introduced between reference signals transmitted from the first antenna in relation to reference signals transmitted from the second antenna; receiving, from another entity, in response to the transmitted reference signals, for a number of the controlled phase differences, one or more indications of a selected precoder matrix; identifying changes of selected precoder matrix over the number of controlled phase differences, over the set of frequency bands, wherein the identifying is based on the received one or more indications; determining at least one relation between the identified changes of selected precoder matrix over the number of controlled phase differences and set of frequency bands; and determining at least one phase affecting error associated with the transmission from the at least one pair of correlated antennas based on said at least one relation, thus enabling adjustment of transmission from the at least one pair of correlated antennas, such that said at least one phase affecting error is reduced.