Efficient OFDM PAPR Reduction Method Using Linear Phase Variation

An efficient OFDM Peak to Average Power Ratio (PAPR) reduction method using linear phase variation is proposed. Applying linear phase variations to sub-blocks of subcarriers is equal to cyclic shifting the corresponding time signals and thus can prevent "Peak collisions". This method differs from conventional Partial Transmit Sequence (PTS) techniques in that PTS applies constant phase variations to sub-blocks. Performance comparison of linear phase variation, constant phase variation and tone reservation with the same number of redundant bits is conducted with 8, 52, and 128-subcarrier QPSK-OFDM signals. Linear phase variation achieves the best PAPR reduction performance in the authors' simulations.