Complexity-Optimized Adaptive Model for Multiband Digital Predistortion of RF Power Amplifiers

DOI number:10.1109/TMTT.2023.3327468

Affiliation of Author(s):中国科学技术大学信息学院

Teaching and Research Group:电子工程与信息科学系

Journal:IEEE Transactions on Microwave Theory and Techniques

Funded by:国家自然科学基金

Key Words:Digital predistortion (DPD), intermodulation (IMD), model complexity, multiband (MB), piecewise linear function, piecewise model, Polar Volterra, power amplifiers (PAs).

Abstract:In this article, we present a low-complexity adaptive digital predistortion (DPD) model for concurrent multiband (MB) power amplifiers (PAs). A novel MB basis function space is constructed for the proposed MB vector combination search (MB-VCS) model by performing multidimensional extensions and adding piecewise linear functions to the Polar Volterra series. The proposed basis function multiplexing-based model search algorithm also helps the MB-VCS model to balance model performance and complexity. The MB-VCS model contains novel in-band and cross-band terms to characterize complex interactions between different band signals and can adaptively construct intermodulation (IMD) terms to handle arbitrary carrier configurations. In order to further exploit the advantages of the MB-VCS model, the MB piecewise VCS (MB-PVCS) model with MB-VCS as a submodel based on the piecewise modeling technique is proposed in this article, and an efficient classification controller construction strategy is designed for the MB-PVCS model. The experimental test results confirm that the MB-VCS and MB-PVCS models achieve a better performance-complexity tradeoff than the state-of-the-art MB single and MB piecewise models.

Co-author:Chengye Jiang,Guichen Yang,Qianqian Zhang

First Author:Renlong Han (韩仁龙)

Indexed by:Journal paper

Correspondence Author:Falin Liu

Document Code:10.1109/TMTT.2023.3327468

Discipline:Engineering

Document Type:J

Volume:72

Issue:6

Page Number:3410-3422

Translation or Not:no

Date of Publication:2024-06-01

Included Journals:SCI、EI