A Low Complexity SLM-PRSC Hybrid Scheme for OFDM PAPR Reduction

OFDM 신호의 PAPR 감소를 위한 저복잡도의 SLM-PRSC 결합 기법

In this paper, to improve OFDM PAPR reduction performance of the conventional SLM method, we propose an effective SLM-PRSC hybrid scheme based on the repeated utilization of identical PRSC sequences in time domain. In the proposed scheme, after performing the SLM for the frequency domain OFDM symbol excluding the pre-determined PRSC positions, the final SLM-PRSC hybrid sequence with the lowest PAPR, which is generated by adding the time domain PRSC sequence to the results of the SLM is selected as the transmitted OFDM symbol. In particular, since the identical PRSC sequences generated a priori are repeatedly used for every OFDM symbol, excessive IFFT calculations are avoided. Moreover, the selected PRSC symbols in the frequency domain may be utilized as an overhead information for the SLM. Simulation results reveal that the proposed SLM-PRSC hybrid scheme can remarkably improve the PAPR reduction performance of the conventional SLM, while avoiding excessive increase of IFFT and PAPR calculations and the overhead for the SLM.