Title:
DUAL-STAGE PREDISTORTION-BASED METHOD FOR CORRECTING ULTRA-WIDEBAND COMPLEX FORMAT VECTOR MODULATION ERROR
Document Type and Number:
WIPO Patent Application WO/2018/090417
Kind Code:
A1
Abstract:
A dual-stage predistortion-based method for correcting an ultra-wideband complex format vector modulation error. A loop of the method comprises: a standard signal generating module, a stage I predistortion error compensator, a stage II predistortion compensator, an origin offset compensator, a transmission channel and a vector modulator. The stage I predistortion error compensator, by forming a filter predistortion, performs reverse cancelling with respect to amplitude and phase frequency response fluctuation characteristics of a wideband vector modulation error. The stage II predistortion error compensator corrects a modulation error that has undergone stage I predistortion balancing and that has wideband characteristics, that is, I/Q gain imbalance and a gain imbalance positive angle error in an entire working band. The origin offset compensator corrects a narrowband modulation error, namely, carrier leakage, by means of an analog device. Vector modulation errors having wideband characteristics are corrected by means of digital predistortion, thus effectively correcting a wideband complex format vector modulation error.
Inventors:
TAI XIN (CN)
LIU LIANG (CN)
FAN XIAOTENG (CN)
ZUO YONGFENG (CN)
XUE XIAONAN (CN)
XU MINGZHE (CN)
LI ZENGHONG (CN)
LIU LIANG (CN)
FAN XIAOTENG (CN)
ZUO YONGFENG (CN)
XUE XIAONAN (CN)
XU MINGZHE (CN)
LI ZENGHONG (CN)
Application Number:
PCT/CN2016/109890
Publication Date:
May 24, 2018
Filing Date:
December 14, 2016
Export Citation:
Assignee:
THE 41ST INSTITUTE OF CHINA ELECTRONIC TECH GROUP CORPORATION (CN)
International Classes:
H04L27/36; H03C7/00
Foreign References:
| CN101694986A | 2010-04-14 | |||
| CN103023829A | 2013-04-03 | |||
| CN104935535A | 2015-09-23 |
Other References:
XIAO PENG ET AL.: "Calibration and Compensation of Wideband Digital Vector Modulation Channel", MODERN ELECTRONIC TECHNIQUE, no. 7, 31 July 2009 (2009-07-31)
ZHOU JUNJIE ET AL.: "A vector Modulation Error Compensation method of I/Q Modulator", CHINESE JOURNAL OF SCIENTIFIC INSTRUMENT, vol. 31, no. 8, 31 August 2010 (2010-08-31), pages 299 - 301
ZHOU JUNJIE ET AL.: "A vector Modulation Error Compensation method of I/Q Modulator", CHINESE JOURNAL OF SCIENTIFIC INSTRUMENT, vol. 31, no. 8, 31 August 2010 (2010-08-31), pages 299 - 301
Attorney, Agent or Firm:
BEIJING KEYI INTELLECTUAL PROPERTY FIRM (CN)
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