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Article

A Look-Up Table Assisted BiLSTM Neural Network Based Digital Predistorter for Wireless Communication Infrastructure

Department of Electrical Engineering, College of Engineering, American University of Sharjah, Sharjah P.O. Box 26666, United Arab Emirates
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Sensors 2025, 25(13), 4099; https://doi.org/10.3390/s25134099
Submission received: 18 April 2025 / Revised: 16 June 2025 / Accepted: 27 June 2025 / Published: 30 June 2025

Abstract

Neural networks are increasingly attractive for digital predistortion applications due to their demonstrated superior performance. This is mainly attributed to their ability to capture the intrinsic traits of nonlinear systems. This paper presents a novel hybrid predistorter labeled as the look-up table assisted bidirectional long-short term memory (BiLSTM) neural network (LUT-A-BiNN) that combines a neural network cascaded with a look-up table in a manner that both sub-models complement each other. The main motivation in using this two-box arrangement is to eliminate the highly nonlinear static distortions of the PA with the look-up table, allowing the neural network to focus on the compensation of the dynamic distortions. The proposed predistorter is experimentally validated using 5G test signals. The results demonstrate the ability of the proposed predistorter to achieve a 5 dB enhancement in the adjacent channel leakage ratio when compared to its single-box counterpart (BiLSTM neural network predistorter) while maintaining the signal-agnostic performance of the BiLSTM predistorter.
Keywords: 5G communications; bidirectional long-short term memory; neural networks; nonlinear distortions; power amplifiers; predistortion 5G communications; bidirectional long-short term memory; neural networks; nonlinear distortions; power amplifiers; predistortion

Share and Cite

MDPI and ACS Style

Al Najjar, R.; Hammi, O. A Look-Up Table Assisted BiLSTM Neural Network Based Digital Predistorter for Wireless Communication Infrastructure. Sensors 2025, 25, 4099. https://doi.org/10.3390/s25134099

AMA Style

Al Najjar R, Hammi O. A Look-Up Table Assisted BiLSTM Neural Network Based Digital Predistorter for Wireless Communication Infrastructure. Sensors. 2025; 25(13):4099. https://doi.org/10.3390/s25134099

Chicago/Turabian Style

Al Najjar, Reem, and Oualid Hammi. 2025. "A Look-Up Table Assisted BiLSTM Neural Network Based Digital Predistorter for Wireless Communication Infrastructure" Sensors 25, no. 13: 4099. https://doi.org/10.3390/s25134099

APA Style

Al Najjar, R., & Hammi, O. (2025). A Look-Up Table Assisted BiLSTM Neural Network Based Digital Predistorter for Wireless Communication Infrastructure. Sensors, 25(13), 4099. https://doi.org/10.3390/s25134099

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