【摘要】 本文基于自适应逆控制原理提出了一种预失真器结构,即双多项式旁路辨识HPA的幅度和相位特征,然后再离线设计预失真器,最后将设计的已稳定的预失真器复制于发射通路。整个自适应过程高效,稳定,运算量小,能实时运行。补偿后的系统在饱和输入值范围内有近似的理想放大器特征。通过对OFDM信号仿真证明了以上特点。更多还原

【Abstract】 In this paper,a structure of predistortion is presented based on the method of adaptive inverse control.A pair of poly- nomials are used to identify the amplitude and phase character of HPA bypass.Then the predistorter is designed off line.Finally the de- signed and steady predistorter is copied to the transmitted path.The whole process is proved high efficient,steady and low computation- al complexity.It can be implemented in real-time condition.The compensated system is characterized by the approximately ideal ampli- fier within the range of saturated input value.The above characters are proved through the simulation in OFDM system.更多还原