Patent ID: 6982965

Claim:
A method of suppressing a peak of a multicarrier transmission signal in a transmission system where filtering processing is performed on each of baseband signals respectively corresponding to a plurality of frequency channels using a filter, the signals subjected to the filtering processing are each multiplied by a predetermined carrier to be single-carrier signals, and the single-carrier signals are combined to obtain a multicarrier transmission signal, comprising the steps of: branching each of the baseband signals from a regular signal processing route, performing filtering processing on each of the baseband signals branched, multiplying each of the baseband signals branched by the same carrier as the predetermined carrier at the same timing as in multiplication by the predetermined carrier, combining the signals obtained, and thereby obtaining a multicarrier signal for use in calculating a correction value for peak suppression; detecting an instantaneous peak of the multicarrier signal for use in calculating the correction value, and based on the detection result, obtaining the correction value for peak suppression; and multiplying each of the baseband signals on the regular signal processing route by the correction value to perform correction for peak suppression.