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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >One-bit in-phase observation for direct learning-based digital predistortion with modified frequency-domain delay estimation and alignment
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One-bit in-phase observation for direct learning-based digital predistortion with modified frequency-domain delay estimation and alignment

机译：一比特同相观测，用于基于直接学习的数字预失真，并具有改进的频域延迟估计和对齐

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摘要

This article proposes a novel digital predistortion (DPD) implementation method forrnRF power amplifiers. The new approach adopts only one 1-bit comparator in thernfeedback path to observe the in-phase (I) or the quadrature (Q) component of thernerror signal between the input and the output signals. To this end, the theoretical derivationrnof the in-phase observation based on direct learning architecture (DLA) DPDrnis first given in this article, by combining the existing 1-bit method and the low-costrnin-phase observation. To facilitate the delay estimation and alignment, a modifiedrniterative frequency-domain delay estimation is presented, which only acquires either Irnor Q components of the output signal to achieve satisfied delay estimation. Experimentalrnresults show that the proposed DPD method decreased the normalized meanrnsquare error (NMSE) and the adjacent channel power ratio (ACPR) to less than 242rnand 251 dB, respectively, which indicates that the proposed DPD system canrnachieve comparable performance as the existing DPD identification techniques withrnlower implementation complexity.
机译：本文提出了一种用于rnRF功率放大器的新型数字预失真（DPD）实现方法。新方法仅在rnfeedback路径中采用一个1位比较器，以观察输入和输出信号之间的rnerror信号的同相（I）或正交（Q）分量。为此，本文首先结合现有的1位方法和低成本的相观测，推导了基于直接学习体系结构（DLA）DPDrnis的相观测的理论推导。为了便于延迟估计和对齐，提出了一种改进的累加频域延迟估计，该方法仅获取输出信号的Irnor Q分量中的任意一个即可获得满意的延迟估计。实验结果表明，所提出的DPD方法将归一化均方误差（NMSE）和相邻信道功率比（ACPR）分别降低至242rn和251 dB以下，这表明所提出的DPD系统可以实现与现有DPD识别技术相当的性能。实现的复杂性。

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  • 作者

    Yikang Zhang; Haoyu Wang; Gang Li; Falin Liu;

  • 作者单位

    Department of Electronic Engineeringand Information Science, University ofScience and Technology of China, Hefei230027, China Key Laboratory of ElectromagneticSpace Information, Chinese Academy ofSciences, Hefei, China;

    Department of Electronic Engineeringand Information Science, University ofScience and Technology of China, Hefei230027, China Key Laboratory of ElectromagneticSpace Information, Chinese Academy ofSciences, Hefei, China;

    Department of Electronic Engineeringand Information Science, University ofScience and Technology of China, Hefei230027, China Key Laboratory of ElectromagneticSpace Information, Chinese Academy ofSciences, Hefei, China;

    Department of Electronic Engineeringand Information Science, University ofScience and Technology of China, Hefei230027, China Key Laboratory of ElectromagneticSpace Information, Chinese Academy ofSciences, Hefei, China;

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  • 正文语种 eng
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  • 关键词

    1-bit; digital predistortion; in-phase observation; power amplifier;

    机译：1位数字预失真分阶段观察;功率放大器;

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