Computationally Efficient Algorithm for Reducing PAPR in OFDM using Null Subcarriers

Abstract- A new algorithm is proposed which is used with existing null-data subcarrier switching method of Peak to Average Power Ratio (PAPR) reduction in OFDM to lower the computational complexity. This proposed algorithm is very simple and achieves significant reduction in computational overhead without sacrificing PAPR reduction capability of null-data subcarrier switching method. The proposed algorithm is compatible with the current commercial systems and it can be used with other existing algorithms to reduce the computational overhead further. The proposed algorithm is very useful in delay sensitive services. The effectiveness of the proposed algorithm is demonstrated by presenting simulation results of PAPR and computational time requirement. Index Terms—Bit error rate (BER), Multicarrier, Orthogonal frequency division multiplexing (OFDM), Peak to average power ratio (PAPR)