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http://dx.doi.org/10.5515/KJKIEES.2008.19.12.1339

Harmonic Signal Linearization of Nonlinear Power Amplifier Using Digital Predistortion for Multiband Wireless Transmitter  

Oh, Kyung-Tae (Department of Electronic Engineering, Konkuk University)
Ku, Hyun-Chul (Department of Electronic Engineering, Konkuk University)
Kim, Dong-Su (Korea Electronics Technology Institute)
Hahn, Cheol-Koo (Korea Electronics Technology Institute)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.19, no.12, 2008 , pp. 1339-1349 More about this Journal
Abstract
In this paper, a nonlinear relationship between an input complex envelope and an output complex envelope of m-th harmonic zone is theoretically analyzed, and AM/$AM_m$ and AM/$PM_m$ are defined. A scheme to extract these characteristics from measured in-phase and quadrature-phase data is suggested. The proposed analysis is verified with a fundamental-fundamental and fundamental-third harmonic measurements for a InGaP power amplifier(PA). Based on the harmonic-band nonlinear analysis and extraction scheme, a new technique to send a signal in m-th harmonic band with a harmonic signal Linearization Digital Predistortion(DPD) scheme is presented. A numerical analysis and a Look-Up Table(LUT) based DPD algorithms to linearize output signal on m-th harmonic zone are developed. For a 16- and a 64-QAM input signals, a DPD for third harmonic signal linearization is implemented, and output spectrum and signal constellation are measured. The wholly distorted signals are linearized, and thus the measured Error Vector Magnitudes (EVM) are 6.4 % and 6.5 % respectively. The results show that a proposed scheme linearizes a nonlinearly distorted harmonic band signals. The proposed nonlinear analysis and predistortion scheme can be applied to multiband transmitter in next generation software defined radio(SDR)/cognitive radio(CR) wireless system.
Keywords
Cognitive Radio; Digital Predistortion; Harmonic; Nonlinearity; Power Amplifiers; Software Defined Radio;
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