一种接收机非线性行为建模方法

A nonlinear behavioral modeling method of receiver

摘要:

提出一种基于多项式的接收机行为建模方法。采用Hammerstein模型构建接收机行为模型，分别用非线性模块与记忆线性模块表征接收机非线性特性和记忆效应；利用傅里叶级数和最小二乘法分别辨识行为模型的非线性模块参数与线性模块参数；最后通过接收机ADS模型仿真数据，验证所提出的接收机非线性行为建模方法。对比分析了ADS仿真和行为模型的AM-AM特性及单音时域波形，实验结果表明，接收机行为模型的AM-AM特征曲线及时域波形与ADS仿真数据吻合程度较好。本文方法可预测接收机的非线性响应，对在复杂电磁环境下的接收机非线性效应评估具有理论价值。

Abstract:

A method for modeling receiver behavior based on polynomials is presented. First, a Hammerstein model structure is employed to build a receiver behavior model, and nonlinear module and memory linear module are utilized to characterize receiver nonlinearity and memory effects, respectively. Secondly, the nonlinear module parameters and the linear module parameters of the behavior model are identified by using the Fourier series and the least square method. Finally, the receiver nonlinear behavior modeling method is verified by simulation data of the receiver ADS model. The AM-AM characteristics and signal-tone time-domain waveforms of the ADS simulation and behavior model are compared and analyzed. The experimental results show that the AM-AM characteristic curve and the time-domain waveform of the receiver behavior model agree well with the ADS simulation data. The proposed method can predict the receiver's nonlinear response, and shows theoretical value for evaluating receiver nonlinear effects in complex electromagnetic environments.