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J Electromagn Eng Sci > Volume 9(3); 2009 > Article
Journal of the Korean Institute of Electromagnetic and Science 2009;9(3):152-158.
DOI: https://doi.org/10.5515/JKIEES.2009.9.3.152   
A Novel Digital Feedback Predistortion Technique with Memory Lookup Table
Jung-Hwan Moon1, Jang-Heon Kim2, Bum-Man Kim1
1Department of Electrical Engineering, Pohang University of Science and Technology(POSTECH)
2Department of Electrical and Compute Engineering, University of Waterloo
Abstract
We have developed a novel digital feedback predistortion(DFBPD) linearization based on RF feedback PD for the wide bandwidth modulated signals. The wideband PD operation is carried out by combining the DFBPD and memory lookup table(LUT). To experimentally demonstrate the linearization performance of the proposed PD technique for wideband signal, a class-AB amplifier using an LDMOSFET MRF6S23140 with 140-W peak envelope power is employed at 2.345 GHz. For a forward-link 2FA wideband code-division multiple-access signal with 10 MHz carrier spacing, the proposed DFBPD with memory LUT delivers the adjacent channel leakage ratio at an 10 MHz offset of -56.8 dBc, while those of the amplifier with and without DFBPD are -43.2 dBc and -41.9 dBc, respectively, at an average output power of 40 dBm. The experimental result shows that the new DFBPD with memory LUT provides a good linearization performance for the signal with wide bandwidth.
Key words: Digital Predistortion, Memory Effect, Power Amplifier, Wideband Code Division Multiple Access
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