Method to discriminate a real echo peak from an aliased echo peak

A method for discriminating a real echo peak from an aliased echo peak created by aliasing phenomenon in an estimated channel impulse response of a telecommunication channel, the method comprising steps of:

• a) sampling a received analogic signal for obtaining digital data corresponding to the received analogic signal,
• b) estimating the channel impulse response over a temporal window of size TIFFT from only a part of the digital data so that aliased echo peaks may appear in the estimated channel impulse response,
• c) computing a correlation between N samples of the digital data and a copy of the same N samples delayed by a time delay Δ1,0 to obtain a first correlation result, time delay Δ1,0 being equal to a time interval T between a first and a second distinct power peaks of the estimated channel impulse response, the first peak being the highest power peak within the temporal window, and/or
• d) computing a correlation between the N samples and a copy of the same N samples delayed by a time delay TIFFT-Δ1,0 to obtain a second correlation result, and
• e) deciding whether the second peak is a real echo peak or an aliased echo peak based on the first and/or second correlation results.