FIRST KNOT METHODS TO ADAPT A MULTI-ANTENNA TRANSMISSION TO A SECOND KNOT THROUGH AN EFFECTIVE CHANNEL, AND SECOND KNOT TO ADAPT A MULTI-ANTENNA TRANSMISSION FROM THE FIRST KNOT

摘要

An objective problem of the invention is to provide a mechanism for improving the performance of a radio access network. According to a first aspect of the present invention, the object is achieved by a method in a first node for adapting a multi-antenna transmission to a second node over an effective channel. The first node and the second node are comprised in a wireless communication system. The method comprises the steps of obtaining at least one symbol stream and determining a precoding matrix having a block diagonal structure. The method comprises the further steps of precoding the at least one symbol stream with the determined precoding matrix, and transmitting the at least one precoded symbol stream over the effective channel to the second node.