A Complexity-Reduced Harmonic-Cancellation Digital Predistortion for HF Transmitters

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 sam...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2021-05, Vol.31 (5), p.529-532
Main Authors: Chen, Long, Chen, Wenhua, Chen, Xiaofan, Chu, Jiaming, Feng, Zhenghe
Format: Article
Language:English
Subjects:
Complexity
Computational complexity
Computational modeling
digital predistortion (DPD)
Harmonic analysis
harmonic cancellation
high frequency (HF)
Higher harmonics
linearization
Power amplifiers
Power harmonic filters
Predistortion
Sampling
Transmitters
Wireless communication
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Summary: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.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2021.3069489