Joint algorithm for peak-to-average power reduction of NC-OFDM system

This paper examines the problem of reducing the peak-to-average power ratio (PAPR) occurring in non-contiguous OFDM (NC-OFDM) systems proposed for cognitive radio. The PAPR analysis for NC-OFDM is unlike that of contiguous OFDM and so mitigation schemes must be modified. We propose an algorithm that combines phase adjustment, interleaving and power back-off in a way that is tailored for NC-OFDM. The proposed algorithm exploits the agility of cognitive radio technology to rapidly choose and employ the appropriate PAPR reduction approach from a set of possibilities to achieve a significant decrease PAPR to a setting threshold. The simulation results show that the proposed algorithm achieves a large decrease in PAPR, and calculation complexity is low.