一种用于F-OFDM系统的改进双线性分数阶DPD

In F-OFDM systems, the signal which is amplified by nonlinear power amplifier (PA) will produce serious distortion. The digital predistortion (DPD) technique is the most common method in PA linearization due to its high flexibility and good linearization performance. In this paper, an improved bilinear fractional order memory polynomial (IBFMP) DPD structure for Filtered Orthogonal Frequency Division Multiplexing (F-OFDM) systems is proposed. First, bilinear memory polynomials (BMP) are combined with fractional memory polynomials (FMP) without the cross term. Replaced the long-term memory effect with the short-term memory effect in this paper. Finally, Added the PAPR reduction technology into F-OFDM system while adopting DPD. The results show that the new structure can improve the linearity of PA, hence, the combined structure can improve the efficiency of PA and the performance of the system.