基于新型二维核函数动态X参数的功放建模

发布时间：2019-05-07 23:30

【摘要】：为了更准确地描述带有记忆效应的射频(RF)功放特性,基于传统的动态X参数模型,结合功放长期记忆效应以及短期记忆效应机理,提出一种新型动态X参数功放建模方法。新模型保留X参数模型的静态核函数,利用双记忆路径模型提取出表征记忆效应的非线性函数,替换动态核函数。采用输出信号为幅度与频率双变量的新型反馈(FB)结构,引入时变频率变量而简化动态核函数为二维核函数。使用MW6S010N设计功放并建模,由仿真可知,新模型在单音大信号及码分多址(CDMA)信号激励下,均能正确表征功放特性,归一化均方误差(NMSE)较静态X参数模型、传统动态X参数模型以及前馈(FF)结构X参数模型分别减少8.0 d B、6.3 d B、2.5 d B。结果表明该模型能够更加准确拟合带有非线性记忆效应功率放大器的特性。
[Abstract]:In order to describe the characteristics of RF (RF) power amplifier with memory effect more accurately, a new modeling method of dynamic X-parameter power amplifier is proposed based on the traditional dynamic X-parameter model and the mechanism of long-term memory effect and short-term memory effect. The new model preserves the static kernel function of the X-parameter model and uses the dual-memory path model to extract the nonlinear function representing the memory effect and to replace the dynamic kernel function. A novel feedback (FB) structure with output signal as amplitude and frequency bivariate is adopted. Time-varying frequency variable is introduced and dynamic kernel function is simplified as two-dimensional kernel function. MW6S010N is used to design and model the power amplifier. The simulation results show that the new model can correctly characterize the power amplifier characteristics under the excitation of single tone large signal and code division multiple access (CDMA) signals. The normalized mean square error (NMSE) model is more stable than the static X parameter model. The traditional dynamic X-parameter model and feedforward (FF) structured X-parameter model reduced 8.0dB, 6.3dB, 2.5dB, respectively. The results show that the model can more accurately fit the characteristics of power amplifier with nonlinear memory effect.
【作者单位】：辽宁工程技术大学电子与信息工程学院;
【基金】：国家自然科学基金资助项目(61372058) 辽宁省高校重点实验室项目(LJZS007)~~
【分类号】：TN722.75

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