Patent ID: 7257174
Filing Date: 2007-08-14
Classification: H04L

Abstract:
1. A method of processing a baseband digital signal block at an output of a filter matched to a radio transmission channel and at an input of a channel equalizer, wherein the baseband signal is fed to a whitening filter estimated for the block by a procedure comprising the steps of: calculating an autocorrelation vector of the baseband signal; determining an estimated autocorrelation vector as a sum of predetermined vectors weighted by respective coefficients, the predetermined vectors comprising a first vector representative of an autocorrelation of a useful signal in a first frequency band, at least one second vector representative of a correlation of the useful signal with a disturbance from at least one channel situated in a second frequency band adjacent to the first band and a third vector representative of a correlation of the useful signal with a thermal noise component, said coefficients being chosen to minimize a deviation between the calculated autocorrelation vector and said estimated autocorrelation vector, estimating a noise autocorrelation vector by subtracting the first vector multiplied by an energy estimation of the useful signal from the estimated autocorrelation vector; estimating coefficients of the whitening filter from the estimated noise autocorrelation vector; applying the estimated coefficients to the whitening filter; and filtering the baseband signal.