Embodiments of the present disclosure provide an apparatus of reducing a peak-to-average ratio of a multi-carrier signal to be transmitted in a wireless communication system. The apparatus comprises a multi-carrier processing circuitry, a storage and a peak cancellation circuitry. The multi-carrier processing circuitry is configured to process a plurality of signals on respective carriers and to combine the processed plurality of signals into a multi-carrier signal to be transmitted. The multi-carrier processing circuitry is further configured to process an injected impulse to obtain an impulse response of the multi-carrier processing circuitry. The storage is configured to store the impulse response as a clipping pulse. The peak cancellation circuitry is configured to apply the clipping pulse to the multi-carrier signal to cancel a peak of the multi-carrier signal whose amplitude is over a predetermined threshold.