Volterra series based predistortion for broadband RF power amplifiers with memory effects  

作　　者：Jin Zhe Song Zhihuan He Jiaming 

机构地区：[1]Zhejiang Univ. of Science and Technology, Hangzhou 310023, P. R. China [2]Coll. of Information Science and Engineering, Zhejiang Univ., Hangzhou 310027, P. R. China [3]Inst. of Communication Technologies, Ningbo Univ., Ningbo 315211, P. R. China

出　　处：《Journal of Systems Engineering and Electronics》2008年第4期666-671,共6页系统工程与电子技术（英文版）

基　　金：the National Natural Science Foundation of China (60671037).

摘　　要：RF power amplifiers （PAs） are usually considered as memoryless devices in most existing predistortion techniques. However, in broadband communication systems, such as WCDMA, the PA memory effects are significant, and memoryless predistortion cannot linearize the PAs effectively. After analyzing the PA memory effects, a novel predistortion method based on the simplified Volterra series is proposed to linearize broadband RF PAs with memory effects. The indirect learning architecture is adopted to design the predistortion scheme and the reeursive least squares algorithm with forgetting factor is applied to identify the parameters of the predistorter. Simulation results show that the proposed predistortion method can compensate the nonlinear distortion and memory effects of broadband RF PAs effectively.RF power amplifiers （PAs） are usually considered as memoryless devices in most existing predistortion techniques. However, in broadband communication systems, such as WCDMA, the PA memory effects are significant, and memoryless predistortion cannot linearize the PAs effectively. After analyzing the PA memory effects, a novel predistortion method based on the simplified Volterra series is proposed to linearize broadband RF PAs with memory effects. The indirect learning architecture is adopted to design the predistortion scheme and the reeursive least squares algorithm with forgetting factor is applied to identify the parameters of the predistorter. Simulation results show that the proposed predistortion method can compensate the nonlinear distortion and memory effects of broadband RF PAs effectively.

关 键 词：power amplifiers PREDISTORTION memory effects Volterra series 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]