High-frequency (HF) transmitter implemented with the multioctave power amplifier (PA) is faced with the problem of high-order harmonics owing to the nonlinearity of the PA. In this letter, a complexity-reduced harmonic-cancellation digital predistortion (CR-HC-DPD) is proposed and a narrow pulse sampling (NPS) method is adopted for model identification. Compared with the previous HC-DPD scheme, the proposed CR-HC-DPD approach greatly decreases the number of sampling points used for modeling and, in turn, reduces the computational complexity. Measurement results on a class-AB GaN PA with a 600-Hz two-tone signal demonstrated that the CR-HC-DPD scheme canceled all the harmonics for being below -60 dBc with less than 5% complexity compared with the HC-DPD scheme.

中文翻译：

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一种降低复杂性的高频发射机谐波消除数字预失真


由于PA的非线性，使用多倍频程功率放大器（PA）实现的高频（HF）发射机面临着高次谐波问题。在这封信中，提出了一种降低复杂度的谐波消除数字预失真（CR-HC-DPD），并采用窄脉冲采样（NPS）方法进行模型识别。与之前的HC-DPD方案相比，所提出的CR-HC-DPD方法大大减少了用于建模的采样点数量，从而降低了计算复杂度。对具有 600 Hz 双音信号的 AB 类 GaN PA 的测量结果表明，CR-HC-DPD 方案消除了所有低于 -60 dBc 的谐波，与 HC-DPD 方案相比，复杂度不到 5% 。