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Paper Abstract and Keywords
Presentation 2014-11-21 11:20
A Polar-modulation EPWM Transmitter with a Class-D Amplifier for OFDM Transmission
Yoshiharu Iikura, Yohtaro Umeda, Yusuke Kozawa (Tokyo Univ. of Sience) MW2014-140
Abstract (in Japanese) (See Japanese page) 
(in English) Power amplifiers for wireless communication systems demand high power efficiency and linearity. Of the available types of high-efficiency switching-mode power amplifiers, envelope pulse-width modulation (EPWM) transmitter is advantageous because of their high power efficiency and linearity. In recent years, EPWM transmitter is studied for applying to orthogonal frequency-division multiplexing (OFDM) widely adopted in wireless communication systems. However, few error vector magnitude (EVM) evaluation with power amplifiers has been reported. This paper shows that the EVM performance of a class-D amplifier is superior to that of a class-E amplifier in a polar-modulation EPWM transmitter for OFDM transmission by computer simulation. In addition, power-added efficiency (PAE) and output power of the two amplifier classes are compared. The calculated EVM is more than 31 dB from 1 to 2.5 GHz with the class-D amplifier. In addition, to evaluate the characteristics of the transmitter and power amplifier when changing the sampling rate of the ΔΣ modulator.
Keyword (in Japanese) (See Japanese page) 
(in English) transmitter / power-ampliffier / OFDM / class-D / envelope pulse-width modulation / EPWM / error vector magnitude / power add efficiency  
Reference Info. IEICE Tech. Rep., vol. 114, no. 318, MW2014-140, pp. 89-94, Nov. 2014.
Paper # MW2014-140 
Date of Issue 2014-11-13 (MW) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF MW2014-140

Conference Information
Committee MW  
Conference Date 2014-11-20 - 2014-11-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagasaki Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave Technologies 
Paper Information
Registration To MW 
Conference Code 2014-11-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Polar-modulation EPWM Transmitter with a Class-D Amplifier for OFDM Transmission 
Sub Title (in English)  
Keyword(1) transmitter  
Keyword(2) power-ampliffier  
Keyword(3) OFDM  
Keyword(4) class-D  
Keyword(5) envelope pulse-width modulation  
Keyword(6) EPWM  
Keyword(7) error vector magnitude  
Keyword(8) power add efficiency  
1st Author's Name Yoshiharu Iikura  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Sience)
2nd Author's Name Yohtaro Umeda  
2nd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Sience)
3rd Author's Name Yusuke Kozawa  
3rd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Sience)
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Speaker Author-1 
Date Time 2014-11-21 11:20:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2014-140 
Volume (vol) vol.114 
Number (no) no.318 
Page pp.89-94 
#Pages 6 
Date of Issue 2014-11-13 (MW) 

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