Method of obtaining a transmission gain function

Method of obtaining a transmission gain function for an array of antennae communicating with a telecommunication terminal, signals received or transmitted from said array of antennae being weighted by weighting vectors {overscore (b)} having N complex coefficients, N being a number of the antennae in the array, the array transmitting to the telecommunication terminal on an downlink channel a downlink transmission signal Sd, the telecommunication terminal transmitting to the array on an uplink channel an uplink transmission signal Su, the uplink channel being disturbed by a first isotropic noise Nu and/or a first directional noise referred to as an uplink interference Iu, and the downlink channel being disturbed by a second isotropic noise Nd and/or a second directional noise referred to as a downlink interference Id, comprising:

• determining a first weighting vector {overscore (b)}u maximizing on reception by the array a ratio (C/(Iu+Nu))u of a received signal coming from the telecommunication terminal to a noise plus interference disturbing the uplink channel;
• and
• calculating from said first weighting vector {overscore (b)}u a second weighting vector {overscore (b)}d maximizing on reception by the telecommunication terminal a ratio (C/(Id+Nd))d of a received signal coming from the array to a noise plus interference disturbing the downlink channel, said second weighting vector is in the form of a matrix product comprising a first noise matrix Du which is a function of a power of the first isotropic noise and/or a power of the first directional noise and a second noise matrix Dd which is a function of a power of the second isotropic noise and/or a power of the second directional noise.