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Paper Abstract and Keywords
Presentation 2009-12-18 15:30
A Study on Quantization Noise Reduction of Delta-Sigma Modulator with Nonuniform Quantization
Mao Hagiwara (Chuo Univ.), Toru Kitayabu, Hiroyasu Ishikawa (KDDI R&D Labs.), Hiroshi Shirai (Chuo Univ.) RCS2009-197
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, a novel delta-sigma modulator which has a non-uniform quantizer is proposed. A delta-sigma modulator is used in a transmitter which has a class-S power amplifier. The proposed delta-sigma modulator reduces the quantization noise which causes spurious emission compared to a delta-sigma modulator which has a uniform quantizer. The output values except the largest one and the threshold values of the non-uniform quantizer are determined using a probability density function of input signal. The largest output value is set to a certain value to make the delta-sigma modulator stable. Simulation results show that the proposed design reduces quantization noise 2.9 dB and 0.5 dB if the input signal is OFDM signal and QPSK signal, respectively compared to a delta-sigma modulator which has uniform quantizer.
Keyword (in Japanese) (See Japanese page) 
(in English) Delta-sigma modulator / Quantization noise / Non-uniform quantizer / Class-S power amplifier / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 341, RCS2009-197, pp. 179-184, Dec. 2009.
Paper # RCS2009-197 
Date of Issue 2009-12-10 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 RCS2009-197

Conference Information
Committee RCS SAT  
Conference Date 2009-12-17 - 2009-12-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Satellite Communications, Broadcasting, Forward Error Correction, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2009-12-RCS-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Quantization Noise Reduction of Delta-Sigma Modulator with Nonuniform Quantization 
Sub Title (in English)  
Keyword(1) Delta-sigma modulator  
Keyword(2) Quantization noise  
Keyword(3) Non-uniform quantizer  
Keyword(4) Class-S power amplifier  
1st Author's Name Mao Hagiwara  
1st Author's Affiliation Chuo University (Chuo Univ.)
2nd Author's Name Toru Kitayabu  
2nd Author's Affiliation KDDI R&D Laboratories Inc. (KDDI R&D Labs.)
3rd Author's Name Hiroyasu Ishikawa  
3rd Author's Affiliation KDDI R&D Laboratories Inc. (KDDI R&D Labs.)
4th Author's Name Hiroshi Shirai  
4th Author's Affiliation Chuo University (Chuo Univ.)
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Date Time 2009-12-18 15:30:00 
Presentation Time 20 
Registration for RCS 
Paper # IEICE-RCS2009-197 
Volume (vol) IEICE-109 
Number (no) no.341 
Page pp.179-184 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2009-12-10 

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