Patent ID: 8213536

Claim:
A method for reducing peak-to-average ratio (PAR) in a data signal comprising: constructing from PAR reserved tones (PRT) a base time-domain compensation signal having a predominant peak; constructing a time-domain compensation signal according to the base time-domain compensation signal, wherein constructing a time-domain compensation signal comprises: constructing the base time-domain compensation signal b(t) from PRT with a peak located at zero, the peak having a magnitude, M b ; creating a sample set of data samples having indexes corresponding to peaks in the data signal that are greater in magnitude than a first predetermined threshold; repeating an iteration until there are no samples in the sample set greater than a first predetermined threshold or until a maximum iteration criteria is met; wherein the iteration comprises selecting a selected sample having a time index τ in the sample set, the selected sample having a magnitude M s greater than a second predetermined threshold; scaling a shifted base time-domain compensation signal b s (t) by a scale factor S, wherein b s (t)=b(t−τ) and b(t−τ) represents a cyclic shift by time index τ, and wherein S≧(M s −T t )/M b where T t is a predetermined target threshold; recording a pair comprising τ and S into a set of pairs; subtracting corresponding samples in the shifted base time-domain compensation signal scaled by S from each sample in the sample set; constructing the time-domain compensation signal by summing S×b(t−τ) for all τ and S pairs in the set of pairs; and using the time-domain compensation signal to reduce PAR.