Adaptive input-power processing for mitigation of PAPR in OFDM

The high peak-to-average-power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) greatly limits the high power amplifier (HPA) power efficiency. Different from other approaches to PAPR mitigation, the approach in this paper presents a simple new scheme which employs adaptive input power processing to reduce the instantaneous power fluctuation of OFDM signals. Specifically, at the transmitter side, the segments of the OFDM signal with high power are pushed down and the ones with low power are pulled up by adaptive adjustment of input power. As a consequence, the PAPR is greatly mitigated. These results are confirmed by computer simulations.