摘要
为了对正交频分复用(OFDM)系统中高阶通道适配(HPA)的非线性特性进行补偿,利用模糊模型设计了一种数字预失真器。由Sugeno模糊模型跟踪HPA的非线性特性得到HPA模型,基于HPA模型在离线过程中设计预失真器,采用自适应算法调节模糊预失真器的参数,实现对非线性影响的补偿。为了避免繁杂的复数运算,设计过程中将信号的相位与幅度分离出来后再分别进行处理。通过仿真验证了该设计方法收敛速度快,系统稳定,补偿效果好。
Based on the fuzzy model,a digital predistorter is designed in Orthogonal Freguency Division Multiplexing(OFDM)system for compensating the nonlinear distortion of Higher Order Path Adaptation(HPA). The nonlinear characteristic of HPA is tracked by the Sugeno fuzzy model.The predistorter is designed in an off-line process based on the HPA model.The parameters of fuzzy predistorter are adjusted by an adaptive algorithm.The phase and amplitude of signals will be separated to avoid complicated complex operation. Simulation results show that the algorithm converges fast and effectively reduces the effects of nonlinear distortion.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2007年第S2期1033-1036,共4页
Journal of University of Electronic Science and Technology of China
基金
广东省自然科学基金(31391)
