Patent ID: 7991047
Filing Date: 2011-08-02
Classification: H04L

Abstract:
1. Method for designing a digital reception filter for a main signal, the method comprising: modelling at least one channel for transmission of at least one signal interfering with said main signal, so as to obtain an interfering channel model; whitening of said at least one interfering signal, by a whitening filter taking into account said interfering channel model and a noise on said model, referred to as a model noise; calculating coefficients of said digital reception filter on the basis of at least one coefficient of said whitening filter; wherein, if said interfering signal is transmitted in a desired frequency band, called a co-channel interfering signal, said whitening filter, called the whitening filter W 1 , verifies the equation: and, if said interfering signal is transmitted in a frequency band different from said desired frequency band, called an adjacent interfering signal, said whitening filter, called the second whitening filter W 2 , verifies the equation: where σ 2 is the power of said model noise; σ 1 2 is the power of a thermal white noise; Tx(z) is the z-transform of a transmission filter Tx; R(z) is the z-transform of a radio filter R; Rx 1 (z) is the z-transform of a first filter Rx 1 ; J 2 (z) is the z-transform of a frequency-shifted transmission filter.