Patent ID: 7613257

Claim:
A method to synchronize an impulse radio signal in a receiver based on a cross-correlation between an input signal and a template pulse train, this method comprising: a. receiving a radio signal, b. applying a reference pulse train, c. splitting the radio signal according to the template pulse train contained in the reference pulse train to obtain a plurality of elementary samples, d. executing at least one unitary cross-correlation on at least one of the plurality of elementary samples with the reference pulse train to obtain a cross-correlation result, e. applying a threshold check on each cross-correlation result, wherein each cross-correlation result has the same weighting to obtain a threshold-checked cross-correlation result, f. summing each threshold-checked cross-correlation result to form a sum result of an output signal, g. storing the sum result, h. shifting the template pulse train by a predetermined offset, i. performing steps b-to-g with the shifted template pulse train to the received radio signal, j. determining the highest sum result over a given time period, wherein the threshold-checked cross-correlation result has three states, i.e. positive, zero and negative.