Low-Complexity Null Subcarrier-Assisted OFDM PAPR Reduction With Improved BER

In this letter, we propose a low-complexity data-null subcarrier switching-based peak-to-average power ratio (PAPR) reduction scheme for the orthogonal frequency division multiplexing systems, which provides improved bit error rate. We perform the switching between the data and null subcarriers in such a way that distance between any two switched null subcarriers remains constant. This method can achieve up to 6 dB signal-to-noise ratio gain and shed the system complexity by more than 98% of the conventional scheme, with a slight compromise of the PAPR reduction capability.