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Paper Abstract and Keywords
Presentation 2015-03-04 15:50
Baseband Signal Reproduction Using Real-Zero for Wireless Communications
Kelong Hu, Kazuhiko Fukawa, Hiroshi Suzuki, Yuyuan Chang (Tokyo Tech) RCS2014-332
Abstract (in Japanese) (See Japanese page) 
(in English) The advanced Si-CMOS IC technology can combine baseband digital circuits and RF analog circuits together, and can implement the combined circuits on a single chip. However, the integrated circuits have major problems such as lower voltage of the analog circuits, lower SNR, gain reduction, and non-uniform characteristics of circuit elements. To cope with these problems, this report proposes a new analog-to-digital conversion scheme based on time digital conversion (TDC). The proposed scheme subtracts a cosine wave considered a reference signal from a bandpass signal, and measures timing when the reference signal coincides with the bandpass signal. Such timing is called real zeros or zero cross. Using the real zeros, the proposed scheme estimates sampled baseband signals by a constrained least squares algorithm.
In addition, for reducing the computational complexity to deal with a long bandpass signal sequence, another scheme divides the long bandpass signal sequence into short sequences, and applies the above-mentioned estimation algorithm into such short sequences.
Computer simulations with frequency of the reference signal and time resolution of real zeros being parameters are conducted in order to quantitatively evaluate accuracy of the signal reproduction.
Keyword (in Japanese) (See Japanese page) 
(in English) Wireless communications / real zero / TDC / signal reproduction / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 490, RCS2014-332, pp. 183-188, March 2015.
Paper # RCS2014-332 
Date of Issue 2015-02-25 (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)
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Conference Information
Committee RCS SR SRW  
Conference Date 2015-03-04 - 2015-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2015-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Baseband Signal Reproduction Using Real-Zero for Wireless Communications 
Sub Title (in English)  
Keyword(1) Wireless communications  
Keyword(2) real zero  
Keyword(3) TDC  
Keyword(4) signal reproduction  
1st Author's Name Kelong Hu  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
2nd Author's Name Kazuhiko Fukawa  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
3rd Author's Name Hiroshi Suzuki  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
4th Author's Name Yuyuan Chang  
4th Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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Speaker Author-1 
Date Time 2015-03-04 15:50:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2014-332 
Volume (vol) vol.114 
Number (no) no.490 
Page pp.183-188 
Date of Issue 2015-02-25 (RCS) 

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