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- Title
Frequency domain data based model extraction for band-limited digital predistortion of wideband RF power amplifiers.
- Authors
Yang, Guang; Liu, Falin; Zhao, Caihong; Wang, Zhenyang; Li, Lingli; Wang, Haoyu
- Abstract
ABSTRACT Bandwidth constraints pose significant challenges to linearization of wideband RF power amplifiers (PAs) with digital predistortion (DPD). A recently proposed band-limited DPD scheme uses a band-limited modeling technique to eliminate the bandwidth constraints and reduce DPD implementation cost. However, time consuming convolution operations are involved for model extraction in this time domain data based band-limited modeling method. In this article, band-limited model extraction is formulated as a generalized least squares problem and investigated from a frequency domain perspective. A frequency domain data based model extraction method is proposed, which greatly reduces the computational complexity for extracting band-limited DPD model parameters. A 10 W GaN HEMT inverse class-F PA excited by a 20 MHz four-carrier WCDMA signal and a 40 MHz two-carrier LTE signal is tested to validate the method. Experimental results show that the computationally efficient frequency domain data based model extraction method for band-limited DPD provides as good linearization performance as the time domain data based method. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:412-420, 2014.
- Subjects
MATHEMATICAL domains; DATA extraction; BANDLIMITED communication; BROADBAND communication systems; RADIO frequency; POWER amplifiers
- Publication
International Journal of RF & Microwave Computer-Aided Engineering, 2014, Vol 24, Issue 3, p412
- ISSN
1096-4290
- Publication type
Article
- DOI
10.1002/mmce.20783