Adaptive Weight Peak-Cancelling Scheme for OFDM Systems

In this paper, a new peak-to-average power ratio (PAPR) reduction method, called adaptive weight peak-cancelling (AWPC), for orthogonal frequency division multiplexing (OFDM) systems is presented. The basic idea is to control the power distribution of clipping noise on the subcarriers, according to the error vector magnitude (EVM) requirements on each data block. This is superior to the conventional peak- cancelling method which can only introduce uniform interference on all data blocks no matter what EVMs are demanded. Moreover, the proposed AWPC can flexibly implement peak-cancelling and tone-reservation schemes simply by setting the weight of peak-cancelling signal. Numerical results show that PAPR can be reduced to 5dB while different EVM requirements due to M-PSK/QAM modulations are well satisfied.