1. Method of decoding an incident UWB signal including successive incident pulses respectively received during successive Pulse Repetition Periods, each incident pulse including one transmitted symbol among M possible symbols, said transmitted symbol being corrupted by Inter Symbol Interferences (ISI), said method comprising the steps of: determining a correlation matrix (Γ), whose terms respectively represent the correlation between all the M possible symbols transmitted in a current Pulse Repetition Period, and at least in the previous and in the next Pulse Repetition Periods, performing a correlation between an incident current pulse received during a current PRP and the M possible symbols transmitted in said current PRP and at least in the previous and in the next PRPs for obtaining a correlation vector (Y), preprocessing said correlation vector (Y) including reducing the effect of the ISI from said correlation vector (Y) by using said correlation matrix (Γ), decoding said preprocessed correlation vector (Y″) for obtaining the bits of the transmitted symbol included in said incident received current pulse.