A reconfigurable in-band digital predistortion technique for mmWave power amplifiers excited by a signal with 640 MHz modulation bandwidth
A reconfigurable in-band digital predistortion technique for mmWave power amplifiers excited by a signal with 640 MHz modulation bandwidth
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一种可重构带内数字预失真技术，适用于由 640 MHz 调制带宽信号激励的毫米波功率放大器
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
A. Zhu
中科院分区：
文献类型：
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作者：
Chao Yu;Debin Hou;Honglei Sun;F. Meng;Xiaowei Zhu;Jianfeng Zhai;Jixin Chen;P. Yan;A. Zhu
本文提出了一种新的带内数字预失真（I-DPD）技术，该技术采用可重构系数金字塔对毫米波功率放大器进行线性化，该放大器由带宽非常大的调制信号（如640 MHz）激励。这种方法可以克服传统DPD操作中的多个带宽再生问题，该问题通常会给5G应用带来负担。该方法采用系数金字塔结构，可以根据系统的工作模式有效地选择所需的核函数来构造非线性核函数，从而大大降低了系统的功耗，提高了系统的效率。640 MHz调制信号的实验结果证明，将DPD能力扩展到即将到来的5G是可能的。
In this paper, a novel in-band digital predistortion (I-DPD) technique with a reconfigurable coefficient pyramid is proposed to linearize a mmWave power amplifier excited by a modulated signal with very large bandwidth, such as 640 MHz. This method can overcome the multiple bandwidth regrowth issue in conventional DPD operation that normally places a burden on the 5G applications. By employing a coefficient pyramid, the proposed method can efficiently select the necessary core functions to build the nonlinear kernels according to the operation modes, which can largely reduce the power consumption and thus increase the system efficiency. Experimental results with 640MHz modulated signal proves that extending the DPD capability into the forthcoming 5G is possible.