Concurrent dual-band digital predistortion implemented with reduced look-up-tables

• Published in: Electronics letters Vol. 53; no. 12; pp. 802 - 804
• Main Authors: Zhang, Qian, Chen, Wenhua, Feng, Zhenghe
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 08.06.2017
• Subjects: adjacent channel power ration performance; concurrent dual‐band digital predistortion; concurrent dual‐band power amplifier; dual‐band DPD technique; PA characteristics; power amplifiers; Power electronics, energy conversion and sustainability; reduced look‐up‐table; reduced LUT; reduced sampling rate; shared model coefficient; table lookup; table lookup; reduced LUT; concurrent dual-band digital predistortion; reduced look-up-table; concurrent dual-band power amplifier; PA characteristics; dual-band DPD technique; power amplifiers; reduced sampling rate; shared model coefficient; adjacent channel power ration performance
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2017.0787

A reduced look-up-tables (LUTs) implementation of digital predistortion (DPD) for concurrent dual-band power amplifiers (PAs) is proposed. In the proposed method, the dual-band output is captured jointly with reduced sampling rate, then the PA characteristics of the lower band and the upper band are identified with a group of shared model coefficients, thus DPD can be implemented with shared LUTs for the two bands, which results in reducing the LUTs by 50% comparing with those traditional dual-band DPD techniques implemented with individual LUTs for each band. Experimental results show that the proposed method can achieve better than −48.2 dBc adjacent channel power ration performance with reduced LUTs.