Simulink framework for the modeling of Cartesian Feedback Power Amplifier linearization systems

2016 1st International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT) Pub Date : 2016-08-01 DOI:10.1109/INSCIT.2016.7598199

Camilo Coelho, D. Dallet, N. Deltimple, E. Kerhervé

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引用次数: 1

Abstract

The Power Amplifier (PA) is a Radio Frequency (RF) circuit and its main goal is to drive the transmitter's (Tx) antenna. It faces a trade-off between spectral efficiency and power saving. Digital Cartesian Feedback (CFB) presents itself as a good linearization system when using narrowband signals in portable or mobile devices. This work starts with the validation of a digital CFB linearization system using a Proportional and Integrative (PI) controller, which is able to decrease spectral side lobes of at least 20dB. Next, non-linearities are added to the elements in the transmission chain in the forward and feedback paths, and the same regulator is used to linearize the system. Finally, the imperfections on the feedback are removed. The results start by validating the digital CFB linearization system, so that different configurations of non-linearities can be simulated and compared. The system operates with 4QAM and 16QAM modulation, raised cosine filter, PA modeled using Salehs equation and a PI regulator.

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用于笛卡尔反馈功率放大器线性化系统建模的Simulink框架

功率放大器(PA)是一种射频(RF)电路，其主要目的是驱动发射机(Tx)天线。它面临着频谱效率和节能之间的权衡。当在便携式或移动设备中使用窄带信号时，数字笛卡尔反馈(CFB)是一种很好的线性化系统。这项工作从使用比例和集成(PI)控制器的数字CFB线性化系统的验证开始，该系统能够减少至少20dB的频谱侧瓣。接下来，在正向和反馈路径中，非线性被添加到传输链中的元素中，并且使用相同的调节器来线性化系统。最后，消除反馈上的缺陷。结果首先验证了数字循环流化床线性化系统，从而可以模拟和比较不同配置的非线性。该系统采用4QAM和16QAM调制、提升余弦滤波器、采用Salehs方程建模的PA和PI调节器。

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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2016 1st International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)

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