IEICE TRANSACTIONS on Electronics
A New Predistorter Using Low Frequency Intermodulation Signals Injection of a Harmonic Generator
Summary :
In this paper, a predistorter using low frequency intermodulation (IM) signals is proposed. The harmonic generator of the proposed predistorter that consists of a hybrid coupler and four diodes biased separately extracts a second order low frequency IM signal. And with multiplication of second order IM signals, fourth order IM signal is obtained. A vector modulator, modulate fundamental signal with low frequency IM signals, generates predistortion IM signals and controls amplitude/phase of them with modulation factors. As a result, this predistorter is suppressed individual order intermodulation distortion signals of power amplifier effectively. The suggested predistorter has been manufactured to operate in Korea PCS base-station transmitting band (1840-1870 MHz). The test results show that the third order IM is cancelled more than 20 dB and the fifth order IM is cancelled about 10 dB for CW two-tone signals. Also, it's improved the adjacent channel power ratio (ACPR) more than 10 dB for CDMA (IS-95) signals.
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- IEICE TRANSACTIONS on Electronics Vol.E86-C No.8 pp.1709-1714
- Publication Date
- 2003/08/01
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- Online ISSN
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- Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
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Young KIM, Hyung Soon JANG, Sung Uk KIM, Ik Soo CHANG, Yong Chae JEONG, "A New Predistorter Using Low Frequency Intermodulation Signals Injection of a Harmonic Generator" in IEICE TRANSACTIONS on Electronics,
vol. E86-C, no. 8, pp. 1709-1714, August 2003, doi: .
Abstract: In this paper, a predistorter using low frequency intermodulation (IM) signals is proposed. The harmonic generator of the proposed predistorter that consists of a hybrid coupler and four diodes biased separately extracts a second order low frequency IM signal. And with multiplication of second order IM signals, fourth order IM signal is obtained. A vector modulator, modulate fundamental signal with low frequency IM signals, generates predistortion IM signals and controls amplitude/phase of them with modulation factors. As a result, this predistorter is suppressed individual order intermodulation distortion signals of power amplifier effectively. The suggested predistorter has been manufactured to operate in Korea PCS base-station transmitting band (1840-1870 MHz). The test results show that the third order IM is cancelled more than 20 dB and the fifth order IM is cancelled about 10 dB for CW two-tone signals. Also, it's improved the adjacent channel power ratio (ACPR) more than 10 dB for CDMA (IS-95) signals.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e86-c_8_1709/_p
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@ARTICLE{e86-c_8_1709,
author={Young KIM, Hyung Soon JANG, Sung Uk KIM, Ik Soo CHANG, Yong Chae JEONG, },
journal={IEICE TRANSACTIONS on Electronics},
title={A New Predistorter Using Low Frequency Intermodulation Signals Injection of a Harmonic Generator},
year={2003},
volume={E86-C},
number={8},
pages={1709-1714},
abstract={In this paper, a predistorter using low frequency intermodulation (IM) signals is proposed. The harmonic generator of the proposed predistorter that consists of a hybrid coupler and four diodes biased separately extracts a second order low frequency IM signal. And with multiplication of second order IM signals, fourth order IM signal is obtained. A vector modulator, modulate fundamental signal with low frequency IM signals, generates predistortion IM signals and controls amplitude/phase of them with modulation factors. As a result, this predistorter is suppressed individual order intermodulation distortion signals of power amplifier effectively. The suggested predistorter has been manufactured to operate in Korea PCS base-station transmitting band (1840-1870 MHz). The test results show that the third order IM is cancelled more than 20 dB and the fifth order IM is cancelled about 10 dB for CW two-tone signals. Also, it's improved the adjacent channel power ratio (ACPR) more than 10 dB for CDMA (IS-95) signals.},
keywords={},
doi={},
ISSN={},
month={August},}
Copy
TY - JOUR
TI - A New Predistorter Using Low Frequency Intermodulation Signals Injection of a Harmonic Generator
T2 - IEICE TRANSACTIONS on Electronics
SP - 1709
EP - 1714
AU - Young KIM
AU - Hyung Soon JANG
AU - Sung Uk KIM
AU - Ik Soo CHANG
AU - Yong Chae JEONG
PY - 2003
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E86-C
IS - 8
JA - IEICE TRANSACTIONS on Electronics
Y1 - August 2003
AB - In this paper, a predistorter using low frequency intermodulation (IM) signals is proposed. The harmonic generator of the proposed predistorter that consists of a hybrid coupler and four diodes biased separately extracts a second order low frequency IM signal. And with multiplication of second order IM signals, fourth order IM signal is obtained. A vector modulator, modulate fundamental signal with low frequency IM signals, generates predistortion IM signals and controls amplitude/phase of them with modulation factors. As a result, this predistorter is suppressed individual order intermodulation distortion signals of power amplifier effectively. The suggested predistorter has been manufactured to operate in Korea PCS base-station transmitting band (1840-1870 MHz). The test results show that the third order IM is cancelled more than 20 dB and the fifth order IM is cancelled about 10 dB for CW two-tone signals. Also, it's improved the adjacent channel power ratio (ACPR) more than 10 dB for CDMA (IS-95) signals.
ER -
English
