Computer simulation and measurement of error vector magnitude (EVM) and adjacent-channel power ratio (ACPR) for digital wireless communication RF power amplifiers

Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-12-01 DOI:10.1109/VETECF.1999.797292

Fu-Ling Lin, Shin-Fu Chen, Liang-Fang Chen, H. Chuang

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引用次数: 15

Abstract

Computer simulation and measurement of the error vector magnitude (EVM) and the adjacent channel power ratio (ACPR) of a 2.4 GHz MMIC power amplifier (PA) for digital wireless communications is presented. A computer simulation based on the /spl pi//4-DQPSK modulation with square-root raised cosine (SRRC) filter is established for this study. Using digital signal processing techniques and a time-domain approach, we can accurately predict the EVM and the ACPR related to the input power. The nonlinear effects of the MMIC PA are modeled as traditional nonlinearity parameters, such as 1-dB gain compression point or third-order intercept point IP3, by which the EVM and ACPR are simulated. A standard NADC modulated signal from a HP ESG-D signal generator is applied to the MMIC PA and the output signal analyzed by a HP 89410A vector signal analyzer. The measured results agree well with the simulation curves. This shows that the computer program by Matlab is useful to RF/microwave system engineers in the design of power amplifiers for digital wireless communications.

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数字无线通信射频功率放大器误差矢量幅值(EVM)和邻接信道功率比(ACPR)的计算机仿真与测量

对用于数字无线通信的2.4 GHz MMIC功率放大器的误差矢量幅值(EVM)和相邻信道功率比(ACPR)进行了计算机仿真和测量。为此，建立了一个基于/spl pi//4-DQPSK调制的SRRC滤波器的计算机仿真系统。利用数字信号处理技术和时域方法，我们可以准确地预测与输入功率相关的EVM和ACPR。采用传统的非线性参数，如1 db增益压缩点或三阶截距点IP3，对MMIC - PA的非线性效应进行建模，并以此来模拟EVM和ACPR。将来自HP ESG-D信号发生器的标准NADC调制信号应用于MMIC PA，并通过HP 89410A矢量信号分析仪对输出信号进行分析。实测结果与仿真曲线吻合较好。这表明Matlab编写的计算机程序对射频/微波系统工程师设计数字无线通信功率放大器是有用的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)

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