PAPR Reduction of SC-FDMA Signals Using Optimized Additive Pre-distortion

One challenge of employing high-order modulations in single carrier frequency division multiple access (SC-FDMA) systems is the resultant high peak-to-average power ratio (PAPR). We propose a novel PAPR reduction scheme by jointly considering the PAPR reduction and the incurred bit error rate (BER) degradation for SC-FDMA systems with high-order modulations. In the proposed scheme, an additive pre-distortion vector is introduced to modify the few modulated symbols causing the peak of the SC-FDMA signal. This pre-distortion vector is optimized to minimize the in-band distortion under the expected PAPR constraint. Simulation results demonstrate that our proposed scheme can achieve the desired PAPR reduction with negligible BER performance degradation.