UM
Joint-digital-predistortion for wireless transmitter’s I/Q imbalance and PA nonlinearities using an asymmetrical complexity-reduced Volterra series model
Yue Li2; Chak-Fong Cheang2; Pui-In Mak2; Rui P. Martins2
2016-04-01
Source PublicationAnalog Integrated Circuits and Signal Processing
ISSN15731979 09251030
Volume87Issue:1Pages:35-47
Abstract

I/Q imbalance and nonlinearities of power amplifier (PA) are the main impairments of wireless transmitters degrading the spectral purity and error vector magnitude (EVM). In order to jointly migrate them, an asymmetrical complexity-reduced Volterra series model is proposed, namely joint-digital predistortion (joint-DPD). Our joint-DPD is inspired by the interaction between such two impairments, providing high degree of dynamic nonlinearities with large memory depths. Also, by understanding the structure of joint-DPD for OFDM signals, lower computational complexity can be achieved by pruning the redundant terms with an asymmetrical structure. The corresponding analysis offers the theoretical basis and its related complexity over different Volterra-series-based joint-DPDs. The performances are evaluated under two scenarios. Especially when a 3.4-dB back-off input power is applied, where severe PA nonlinearities are presented with the I/Q imbalance, the measured (left, right) adjacent channel power ratio is improved from (−19.9, −19.6 dBc) to (−37.3, −37.9 dBc), and the EVM is reduced from 22.1 to 3.4 %. For performance comparison, other Volterra-series-based DPDs such as memory polynomial, dynamic deviation reduction and generalized memory polynomial, are also extended to joint-DPD.

KeywordComputational Complexity Digital Predistortion (Dpd) I/q Imbalance Power Amplifier (Pa) Ofdm Volterra Series
DOI10.1007/s10470-016-0724-2
URLView the original
Indexed BySCI
Language英语
WOS Research AreaComputer Science ; Engineering
WOS SubjectComputer Science, Hardware & Architecture ; Engineering, Electrical & Electronic
WOS IDWOS:000373125100004
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Cited Times [WOS]:4   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.State-Key Laboratory of Analog and Mixed-Signal VLSI and Faculty of Science and Technology - Department of ECE, University of MacauMacao, China
2.Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
Recommended Citation
GB/T 7714
Yue Li,Chak-Fong Cheang,Pui-In Mak,et al. Joint-digital-predistortion for wireless transmitter’s I/Q imbalance and PA nonlinearities using an asymmetrical complexity-reduced Volterra series model[J]. Analog Integrated Circuits and Signal Processing,2016,87(1):35-47.
APA Yue Li,Chak-Fong Cheang,Pui-In Mak,&Rui P. Martins.(2016).Joint-digital-predistortion for wireless transmitter’s I/Q imbalance and PA nonlinearities using an asymmetrical complexity-reduced Volterra series model.Analog Integrated Circuits and Signal Processing,87(1),35-47.
MLA Yue Li,et al."Joint-digital-predistortion for wireless transmitter’s I/Q imbalance and PA nonlinearities using an asymmetrical complexity-reduced Volterra series model".Analog Integrated Circuits and Signal Processing 87.1(2016):35-47.
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