【摘要】 提出了一种用于正交频分复用(OFDM)系统中补偿由大功率放大器引起的非线性失真的基带自适应预失真方法。自适应预失真器是基于对大功率放大器的非线性特性进行分段估计,由曲线拟合逐段取逆变换来训练大功率放大器的预失真器的非线性参数,以达到预是真补偿的目的。计算机仿真结果表明,该方法具有收敛速度快、需要动态存储器(RAM)少、补偿效果好等特点。更多还原

【Abstract】 A digital base band adaptive predistortion method to compensate nonlinear distortions introduced by a high-power amplifier (HPA) in orthogonal frequency division multiplexing (OFDM) system is proposed. The adaptive predistorter given can achieve the predistortion compensation based on piecewise estimating HPA nonlinear characteristic curve and training HPA estimator nonlinear parameters via performing inverse transform with curve fitting section by section. The computer simulation result shows that the method algorithm converges fast, RAM requires less and compensation effect is good.更多还原