Peak-to-Average Power Ratio Reduction of OFDM based on Adaptive Peak Reduction Carriers

Tone reservation for peak to average power ratio is considered. The selection of the tone is based on the channel condition. The subcarrier with the worst channel condition is chosen to be our peak reduction carrier to effectively lower the signal PAPR and increase the efficiency of subcarrier transmission. In searching the proper modulation level of the peak reduction carriers, a modified algorithm to recursively adapt this modulation level is proposed. The adjustment is to ensure that a certain percentage of the reduction of the PAPR is achieved. The percentage is reduced in every iteration until the goal is achieved.