DocumentCode :
1630518
Title :
A simple predistorter in fixed microwave radio system with the transmission power control
Author :
Iwamatsu, Takanori ; Zhou, Jianmin ; Li, Hui ; Shi, Zhan ; Chen, Pei ; Zhao, Bingbing ; Kakinuma, Kazuyoshi
Author_Institution :
Fujitsu Labs. Ltd., Yokohama, Japan
fYear :
2012
Firstpage :
65
Lastpage :
68
Abstract :
This paper presents an orthogonal look up tables (LUTs) based predistorter (PD) whose coefficients are generated adaptively to minimize the out-band distortion power. It has low complexity and high robustness to impairments from the feedback circuit, with the drawback of slow convergence meanwhile. To counteract the performance degradation in the case of fast transmission power control (TPC) due to the slow convergence, a selection mechanism between on-line generated and memorized coefficients is proposed. The orthogonal LUTs based perdistorter and its TPC countermeasure were implemented in a fixed microwave radio system, where 14 dB reduction of adjacent channel leakage ratio (ACLR) was verified relying on experiments. In addition, the performance in the case of 100 dB/s TPC was also confirmed to satisfy the ACLR requirement of -45 dB.
Keywords :
adjacent channel interference; circuit feedback; distortion; microwave links; table lookup; ACLR; TPC countermeasure; adjacent channel leakage ratio; feedback circuit; fixed microwave radio system; memorized coefficient; online generated coefficient; orthogonal LUT based perdistorter; orthogonal look up table; out-band distortion power; performance degradation; selection mechanism; slow convergence; transmission power control; Bit error rate; Convergence; Degradation; Delay; Microwave communication; Table lookup; ACLR; TPC; orthogonal LUTs; predistorter;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Amplifiers for Wireless and Radio Applications (PAWR), 2012 IEEE Topical Conference on
Conference_Location :
Santa Clara, CA
Print_ISBN :
978-1-4577-1119-0
Type :
conf
DOI :
10.1109/PAWR.2012.6174941
Filename :
6174941
Link To Document :
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