Patent ID: 7236533

Claim:
A method for reducing a ratio of peak power to average power of multi-carrier signals, comprising the steps of: modulating the multi-carrier signals; summing modulated multi-carrier signals to form a combination signal; performing compensation by computing and searching on at least one of carriers based on the combination signal to obtain a resultant compensation signal, the step of performing compensation further comprising: determining whether value of each sample point of the combination signal is within a predetermined permitted range, wherein for a constant envelope compensation, the predetermined permitted range is within a range of ±5% of a constant envelope value, and for other compensations, only requirement for the predetermined permitted range is that an absolute value of the sample point is smaller than a maximum value; for the sample point of the combination signal that is within the predetermined permitted range, assigning 0 to the value of the sample point of the corresponding compensation signal; and for the sample point of the combination signal that is not within the predetermined permitted range, the following calculation is performed: a) calculating a first compensation signal to decide whether there is a value, if there is, then using the first compensation signal as the resultant compensation signal to be summed with the combination signal for producing a compensated signal; b) if there is no value for the first compensation signal, then calculating a second compensation signal to decide whether there is a value, if there is a value, then using the second compensation signal as the resultant compensation signal to be summed with the compensation signal for producing the compensated signal; and c) if there is still no value for the second compensation signal, then performing a combination compensation via a searching method to produce the resultant compensation signal; and summing the resultant compensation signal with the combination signal to produce the compensated signal.