Method to implement a multiple input multiple output transmission mode

摘要

A method to implement a Multiple Input Multiple Output transmission mode In the method of the invention, said MIMO transmission mode comprises using a certain number of antennas in a user equipment and a given number of antennas in a radio access node for the communication between said user equipment and said radio access node, said communication carried out by means of a communication channel, said communication channel represented by a channel matrix. The method of the invention is characterized in that it comprises uncorrelating at least part of the coefficients of said channel matrix when said communication channel is degenerate by making use of at least one additional antenna in each of said radio access node and said user equipment in order to change the radiation pattern associated to transmission layers of said communication enabling the use of an enhanced MIMO transmission mode.

主权项

1. A method to implement a Multiple Input Multiple Output transmission mode, said MIMO transmission mode comprising using a plurality of first antennas in a user equipment and a plurality of second antennas in a radio access node for the communication between said user equipment and said radio access node, said communication carried out by means of a communication channel, said communication channel represented by a channel matrix, comprising uncorrelating at least part of the coefficients of said channel matrix when said communication channel is degenerate by making use of at least one additional antenna in each of said radio access node and said user equipment in order to change radiation patterns associated to transmission layers of said communication, the method comprising:
creating two arrays between said at least one additional antenna and two adjacent antennas of said plurality of second antennas or said plurality of first antennas, each of said two arrays associated to one of said transmission layers; and feeding said at least one additional antenna with a linear combination of the signals that feed said two adjacent antennas, according to the following expression:
T3=exp(i·φ1)·T1+exp(i·φ2)·T2 where
T3 is the signal that feeds said at least one additional antenna; T1 and T2 are said signals that feed said two adjacent antennas; φ1 and φ2 are the relative phases of said adjacent antennas; exp is the exponential function; and i is equal to a square root of −1.