Tone reservation based peak power reduction in OFDMA uplink systems

Abstract

Tone reservation (TR) has been proposed to reduce the peak-to-average power ratio (PAPR) of orthogonal frequency division multiple access (OFDMA) uplink communication systems. However, it introduces multiple-access interference (MAI) at the receiver. To reduce the effects of MAI, TR was proposed which uses all unused subcarriers at the OFDMA transmitter to generate a peak reduction signal under power spectral density constraints. However, the accumulated MAI at the receiver can be significant, which leads to performance degradation. To address this problem, we consider both PAPR and MAI reduction using TR and propose ordering the subcarriers before allocating the peak reduction tones. In so doing, we are able to achieve PAPR reduction with causing only minimal MAI.