A General Adaptive Digital Predistortion Architecture for Stand-Alone RF Power Amplifiers
A General Adaptive Digital Predistortion Architecture for Stand-Alone RF Power Amplifiers
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DOI：
10.1109/tbc.2013.2261215
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发表时间：
2013-08
影响因子：
4.5
通讯作者：
H. Qian;Hao Huang;S. Yao
中科院分区：
文献类型：
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作者：
H. Qian;Hao Huang;S. Yao
提出了一种用于独立射频功率放大器的自适应数字预失真器（DPD）的通用结构。所提出的架构的输入和输出都是RF信号，这与独立的PA兼容。该DPD系统由三部分组成：用于线性化的RF PA、具有两个下变频路径和一个上变频路径的RF前端以及具有ADC/DAC的现场可编程门阵列（FPGA）板。该架构具有自适应数字基带预失真的成本和性能优势，同时将DPD覆盖范围扩展到具有直接RF输入和输出的一般PA应用。实现了一个独立PA的DPD原型。在一个典型的基站功率放大器上的测量结果验证了所提出的架构的性能改善。实验结果表明，所提出的DPD架构的通用性，通过与传统的DPD系统的性能比较。
This paper presents a general architecture of adaptive digital predistorter (DPD) for stand-alone radio frequency (RF) power amplifiers (PAs). The input and output of the proposed architecture are both RF signals, which is compatible with a stand-alone PA. This DPD system consists of three parts: the RF PA for linearization, RF front-ends with two down-conversion paths and one up-conversion path, and a field-programmable gate array (FPGA) board with ADC/DACs. This architecture enjoys the cost and performance advantages of the adaptive digital baseband predistortion while extending the DPD coverage to the general PA applications with direct RF input and output. A DPD prototype for stand-alone PAs is implemented. Performance improvement of the proposed architecture is validated by measurement results on a typical base-station PA. Experimental results demonstrate the generality of the proposed DPD architecture by comparing the performance with the conventional DPD system.