Calibrated Digital Predistortion Using a Vector Network Analyzer as the Receiver
Calibrated Digital Predistortion Using a Vector Network Analyzer as the Receiver
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DOI：
10.1109/arftg.2019.8739180
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发表时间：
2019-06
期刊：
影响因子：
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通讯作者：
Thaimí Niubó-Alemán;Yunsik Hahn;P. Roblin;J. Teyssier;J. A. Reynoso‐Hernández;V. Chen;S. Rajan
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文献类型：
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作者：
Thaimí Niubó-Alemán;Yunsik Hahn;P. Roblin;J. Teyssier;J. A. Reynoso‐Hernández;V. Chen;S. Rajan
本文报告的第一个演示的行为建模和预失真线性化的功率放大器（PA）的周期性调制信号使用矢量网络分析仪（VNA）在接收机模式下工作。在该演示中，使用具有10.2 dB的峰均功率比（PAPR）的5 MHz LTE信号来表征工作在2.3 GHz的PA。使用20 MHz OFDM信号校准由VNA接收器测量的周期信号的傅立叶频谱的相位。然后，频域中的5 MHz LTE信号的校准相位和幅度被用于在时域中重构信号。在同步之后，可以从测量数据计算PA在预失真之前和之后的NMSE、动态AM-AM和AM-PM、ACPR、EVM和BER。PA的预失真线性化验证了用于调制波形的VNA相位校准和同步方法的准确性。这项工作表明，相同的VNA和校准的测试平台可用于表征（1）连续波（CW）和（2）调制的非线性响应的设备，而不破坏与它的电接触。
This paper reports the first demonstration of the behavior modeling and predistortion linearization of a power amplifier (PA) for periodic modulated signals using a vector network analyzer (VNA) operated in the receiver mode. In this demonstration a PA operated at 2.3 GHz is characterized using a 5 MHz LTE signal with a peak-to-average power ratio (PAPR) of 10.2 dB. The phases of the Fourier spectrum of the periodic signal measured by the VNA receiver are calibrated using a 20 MHz OFDM signal. The calibrated phases and amplitudes of the 5 MHz LTE signal in the frequency domain are then used to reconstruct the signal in the time domain. After synchronization, the NMSE, dynamic AM-AM and AM-PM, ACPR, EVM, and BER of the PA before and after predistortion can then be calculated from the measured data. The predistortion linearization of the PA validates the accuracy of the VNA phase calibration and synchronization methodology used for the modulated waveforms. This work demonstrates that the same VNA and calibrated testbed can be used to characterize both the (1) continuous-wave (CW) and (2) modulated nonlinear response of a device without breaking electrical contacts with it.