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Paper Abstract and Keywords
Presentation 2011-12-16 15:30
Suppression of Quantization Noise for EPWM Transmitter with Saturated Power Amplifier
Shinsuke Yokozawa, Yasushi Yamao (Univ. of Electro-Comm.) RCS2011-261
Abstract (in Japanese) (See Japanese page) 
(in English) OFDM is widely used for mobile communications because it has high spectral efficiency and robustness for multipath fading. However, it has high PAPR and weakness for intermodulation distortion. Thus, it is difficult for current power amplifiers to amplify the OFDM signal with high power efficiency and good linearity. To address these issues, envelope pulse-width modulation (EPWM) transmitter has been proposed. It employs $\Delta-\Sigma$ modulator to convert envelope of the high PAPR signal into pulse-width modulation (PWM) waveform. The power efficiency of the power amplifier is improved by operating in saturation mode in the EPWM transmitter. However, quantization noise from $\Delta-\Sigma$ modulator degrades signal quality and causes jamming to adjacent channels. To suppress the quantization noise from EPWM transmitter, amplitude noise compensating (ANC) EPWM transmitter is proposed. In this paper, the performance of the ANC-EPWM transmitter with saturated power amplifier is analyzed and it is shown to reduce a required output backoff by applying the predistortion method.
Keyword (in Japanese) (See Japanese page) 
(in English) Power amplifier / Predistortion / Δ-Σ modulator / Quantization noise / OFDM / EPWM / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 345, RCS2011-261, pp. 171-176, Dec. 2011.
Paper # RCS2011-261 
Date of Issue 2011-12-08 (RCS) 
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 RCS2011-261

Conference Information
Committee NS RCS  
Conference Date 2011-12-15 - 2011-12-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Yamaguchi University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Ad-hoc Network, Ubiquitous Network, Wireless Communication, security, Multi-Access Network 
Paper Information
Registration To RCS 
Conference Code 2011-12-NS-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Suppression of Quantization Noise for EPWM Transmitter with Saturated Power Amplifier 
Sub Title (in English)  
Keyword(1) Power amplifier  
Keyword(2) Predistortion  
Keyword(3) Δ-Σ modulator  
Keyword(4) Quantization noise  
Keyword(5) OFDM  
Keyword(6) EPWM  
Keyword(7)  
Keyword(8)  
1st Author's Name Shinsuke Yokozawa  
1st Author's Affiliation The University of Electro-Communications (Univ. of Electro-Comm.)
2nd Author's Name Yasushi Yamao  
2nd Author's Affiliation The University of Electro-Communications (Univ. of Electro-Comm.)
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Speaker Author-1 
Date Time 2011-12-16 15:30:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2011-261 
Volume (vol) vol.111 
Number (no) no.345 
Page pp.171-176 
#Pages 6 
Date of Issue 2011-12-08 (RCS) 

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