A Novel Digital Predistortion of 5G Wideband Power Amplifier with Narrow Bandwidth ADC
A Novel Digital Predistortion of 5G Wideband Power Amplifier with Narrow Bandwidth ADC
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DOI：
10.1109/vtcspring.2018.8417490
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Ning Guan;Hua Wang;K. Li
中科院分区：
文献类型：
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作者：
Ning Guan;Hua Wang;K. Li
数字预失真(DPD)在当前的第四代(4G)移动系统中发挥了重要作用，以提高功率放大器(PA)的线性度，并有望在即将到来的5G中继续发挥其功能。然而，5G场景下的大信号带宽使DPD的实现变得复杂，尤其是DPD用来观察功放输出的反馈路径。针对未来宽带功率放大器(PA)的DPD，提出了一种新的反馈策略，采用低采样率、窄模拟带宽的ADC。为了增强该方法的可实现性，文中讨论了硬件实现中的一些问题。仿真结果表明，与传统的DPD相比，该方法可以获得与传统DPD相似的线性化效果，而反馈代价要低得多。
Digital predistortion (DPD) has played an important role in current forth-generation (4G) mobile system to enhance the linearity of power amplifier (PA) and is expected to continue its functionality in forth-coming 5G. However, large signal bandwidth in 5G scenario complicates the implementation of DPD, especially the feedback path which DPD employs to observe PA output. In this paper, a novel feedback strategy is proposed for DPD of future wideband power amplifier (PA), using ADC with low sampling rate and narrow analog bandwidth. Some issues on practical hardware implementation are addressed to strengthen the realizability of our proposed approach. Simulation results show that similar linearization performance of PA can be achieved compared to conventional DPD, with much lower feedback cost.