Joint reduction of peak-to-average power ratio and out-of-band power based on subcarrier weighting in OFDM systems

Considering the conflict of PAPR and OBP reductions in OFDM systems,a new method based on subcarrier weighting was proposed for the joint reduction.The symbols on subcarriers were multiplied by optimal weighting vector to reduce PAPR and OBP jointly,and an improved GA was used to calculate the optimal weighting vector for lower complexity.It was more effective in spectrum utility and did not need any transmission of side information.Furthermore,with trade-off parameter,it offered more flexibility to control the reduction by changing the relative weighting of the two optimization criteria.The simulation results indicate that,compared with a system that performs two separate optimization steps,the proposed method can significantly enhance the amount of PAPR and OBP reduction with lower computation complexity.It is simple to implement,which makes it very practical.