A Low-Cost Digital Predistortion Method Based on 2D Look-Up Tables for 5G Mobile Applications
Part Of
Asia-Pacific Microwave Conference Proceedings, APMC
ISSN
26903946
ISBN (of the container)
9798331534554
ISBN
9798331534554
Date Issued
2025
Author(s)
Abstract
Look-up table based (LUT) digital predistortion (DPD) is widely used for power amplifier (PA) linearization in mobile wireless devices thanks to its low computational complexity and low latency. This paper introduces a 2D-LUT-based DPD that not only alleviates the nonlinearity from the PA, but also mitigates the nonideality of the IQ modulators. The DPD algorithm is tested with a generic 64-quadrature amplitude modulation (64-QAM) signal operating at a 3.5-GHz carrier frequency, under which high IQ imperfections are present. The nonlinear PA used in the testing is operated over its 1-dB compression point, delivering an output power of 31.4 dBm. With the implementation of this DPD algorithm, issues such as IQ imbalance and IQ offset introduced by the IQ modulator can be effectively corrected. As a result, the linearity performance of the transmitter significantly improves and surpasses the stringent requirements of 5G applications.
Event(s)
2025 Asia-Pacific Microwave Conference, APMC 2025, 2 December 2025 - 5 December 2025, Jeju Island
Subjects
digital predistortion (DPD)
IQ imbalance
IQ offset
look-up table (LUT)
power amplifier (PA)
Publisher
Institute of Electrical and Electronics Engineers Inc.
Type
conference paper