Method of transmission of a multi-carrier source signal, comprising symbols constituted by a set of carriers, intended to be sent out simultaneously and comprising carriers reserved for at least one processing operation for reducing the peak-to-average power ratio of said source signal, and data carriers, said method comprising the following steps: - generation of an additional signal and addition to said source signal of said additional signal, delivering an optimized signal having a peak-to-average power ratio smaller than the peak-to-average power ratio of said source signal, - transmission of said optimized signal, characterized in that said step of generation and addition of an additional signal comprises, for each symbol of said source signal, a step for obtaining M time samples representing said symbol and at least one iteration of the following steps: - detection of P time samples from among said P time samples representing said symbol, said P samples being the P samples of the highest amplitude among said M samples, or said P samples presenting a power value above a pre-determined threshold, - in the frequency domain, activation of at least one of said reserved carriers of said symbol, by the addition of a pre-determined power to said at least one of said reserved carriers, - for each activated reserved carrier: ∘ obtaining M time samples representing said activated reserved carrier, ∘ applying a phase shift, taking account of said P detected samples, to said M time samples representing said activated reserved carrier, delivering M time samples representing an additional signal associated with said activated reserved carrier, ∘ adding the M time samples representing said additional signal associated with said activated reserved carrier to said M time samples representing said symbol, delivering M time samples representing said symbol to be used for the detection step of the next iteration. - generation of an additional signal and addition to said source signal of said additional signal, delivering an optimized signal having a peak-to-average power ratio smaller than the peak-to-average power ratio of said source signal, - transmission of said optimized signal, - detection of P time samples from among said P time samples representing said symbol, said P samples being the P samples of the highest amplitude among said M samples, or said P samples presenting a power value above a pre-determined threshold, - in the frequency domain, activation of at least one of said reserved carriers of said symbol, by the addition of a pre-determined power to said at least one of said reserved carriers, - for each activated reserved carrier: ∘ obtaining M time samples representing said activated reserved carrier, ∘ applying a phase shift, taking account of said P detected samples, to said M time samples representing said activated reserved carrier, delivering M time samples representing an additional signal associated with said activated reserved carrier, ∘ adding the M time samples representing said additional signal associated with said activated reserved carrier to said M time samples representing said symbol, delivering M time samples representing said symbol to be used for the detection step of the next iteration. ∘ obtaining M time samples representing said activated reserved carrier, ∘ applying a phase shift, taking account of said P detected samples, to said M time samples representing said activated reserved carrier, delivering M time samples representing an additional signal associated with said activated reserved carrier, ∘ adding the M time samples representing said additional signal associated with said activated reserved carrier to said M time samples representing said symbol, delivering M time samples representing said symbol to be used for the detection step of the next iteration.