Method for spatially multiplexing MIMO communication links, for downlinks (DL) and/or uplinks (UL), within a communication network comprising at least one central node NC comprising an emission/reception network and at least two users T 1 , T 2 , each one of said two users being equipped with an emission/reception network, wherein: • to calculate the coefficients used on emission (pre-coding), at least two channel vectors associated with each of the two users T 1 , T 2 are required to be orthogonal at the central-node reception network (UL) or at the reception network of the users (DL), said method being characterized in that • The emission coefficients of a signal for the downlink DL emitted from the central node NC to at least each user T i comprising K e emission antennas, i = 1 and 2, are determined by executing at least the following steps: • Calculating the pre-coding vectors v 1 and v 2 respectively associated with the two users T 1 , T 2 by searching for a linear combination of the eigenvectors associated with the two highest eigenvalues of the SVD of the channel matrices H 1 and H 2 of the downlink, where α and λ are two complex variables: v 1 = v 11 + α ∗ v 12 1 + α 2 v 2 = v 21 + λ v 22 1 + λ 2 α is a solution of an equation of the second degree: aα 2 + bα + c = 0 with: { a = σ 12 2 σ 21 2 − σ 22 2 v 12 H v 21 v 12 H v 22 b = σ 12 2 σ 21 2 − σ 22 2 σ 11 2 v 11 H v 21 v 12 H v 22 + σ 21 2 σ 11 2 − σ 12 2 σ 22 2 v 12 H v 21 v 11 H v 22 c = σ 11 2 σ 21 2 − σ 22 2 v 11 H v 21 v 11 H v 22 two values are obtained for α and for each value α 1 , α 2 the associated value of λ is determined using the formula: λ = − ασ 12 2 v 12 H v 21 + σ 11 2 v 11 H v 21 ασ 12 2 v 12 H v 22 + σ 11 2 v 11 H v 22 Choosing from the two pairs of values ( α 1 , λ 1 ) and ( α 2 , λ 2 ) the pair that maximizes a function of the SNIRs associated with the two users, which are defined as follows: { SNIR 1 = σ 11 2 + σ 12 2 α 2 1 + α 2 SNIR 2 = σ 21 2 + σ 22 2 λ 2 1 + λ 2 where σ ij 2 corresponds to the square of the singular value j of the channel matrix Hi. • to calculate the coefficients used on emission (pre-coding), at least two channel vectors associated with each of the two users T 1 , T 2 are required to be orthogonal at the central-node reception network (UL) or at the reception network of the users (DL), said method being characterized in that • The emission coefficients of a signal for the downlink DL emitted from the central node NC to at least each user T i comprising K e emission antennas, i = 1 and 2, are determined by executing at least the following steps: • Calculating the pre-coding vectors v 1 and v 2 respectively associated with the two users T 1 , T 2 by searching for a linear combination of the eigenvectors associated with the two highest eigenvalues of the SVD of the channel matrices H 1 and H 2 of the downlink, where α and λ are two complex variables: v 1 = v 11 + α ∗ v 12 1 + α 2 v 2 = v 21 + λ v 22 1 + λ 2 α is a solution of an equation of the second degree: aα 2 + bα + c = 0 with: { a = σ 12 2 σ 21 2 − σ 22 2 v 12 H v 21 v 12 H v 22 b = σ 12 2 σ 21 2 − σ 22 2 σ 11 2 v 11 H v 21 v 12 H v 22 + σ 21 2 σ 11 2 − σ 12 2 σ 22 2 v 12 H v 21 v 11 H v 22 c = σ 11 2 σ 21 2 − σ 22 2 v 11 H v 21 v 11 H v 22 two values are obtained for α and for each value α 1 , α 2 the associated value of λ is determined using the formula: λ = − ασ 12 2 v 12 H v 21 + σ 11 2 v 11 H v 21 ασ 12 2 v 12 H v 22 + σ 11 2 v 11 H v 22 Choosing from the two pairs of values ( α 1 , λ 1 ) and ( α 2 , λ 2 ) the pair that maximizes a function of the SNIRs associated with the two users, which are defined as follows: { SNIR 1 = σ 11 2 + σ 12 2 α 2 1 + α 2 SNIR 2 = σ 21 2 + σ 22 2 λ 2 1 + λ 2 where σ ij 2 corresponds to the square of the singular value j of the channel matrix Hi. <EOS>