OFDM技术具有频谱利用率较高和抗多径干扰能力强的优点.但OFDM信号较高的峰值平均功率比对功率放大器的线性度提出了更高的要求。针对有记忆功率放大器,提出了一种基于查找表的自适应预失真方案,该方案利用多项式法补偿放大器的非线性特性,并将其应用于OFDM系统中。仿真结果表明,该方案能够很好地改善预失真效果,并且在算法收敛速度和节约硬件资源方面都有所提高。 OFDM technology has the advantages of high spectral efficiency and strong anti-multipath interference ability, but the higher peak-average power ratio of OFDM signals puts higher requirements on the linearity of the power amplifier. For a memory amplifier, an adaptive predistortion scheme based on look-up table is proposed, which uses the polynomial method to compensate the non-linearity of the amplifier and applies it to the OFDM system. The simulation results show that the proposed scheme can improve the pre-distortion effect and improve the algorithm convergence speed and hardware resources saving.