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Paper Abstract and Keywords
Presentation 2014-02-21 09:00
A study on applying OFDM/FM scheme to satellite communication systems
Keisuke Fukami, Masato Saito (Univ. of Ryukyu) SAT2013-58
Abstract (in Japanese) (See Japanese page) 
(in English) In satellite communication systems, non-linear amplifiers are used because of their power efficiency. Thus, it is difficult to apply OFDM (Orthogonal Frequency Division Multiplexing) scheme to satellite communication for improving the data rate due to the large PAPR (Peak-to-Average Power Ratio). To solve the problem, we consider OFDM/FM (OFDM over Frequency Modulation) scheme for satellite communication systems.
In this study, we evaluate QM (Quadrature Modulation) method and Hermitian symmetry method to convert complex OFDM signals to real-valued ones to modulate OFDM signals by FM. Besides, we consider clipping and companding to further limit the amplitude of OFDM signals to efficiently utilize the frequency region. We have performed computer simulation of OFDM/FM system to evaluate BER performances of the systems with the signal conversions and the non-linear transforms. According to the simulation results, 10 dB gain can be achieved by Hermitian symmetry method compared to QM method and also by clipping compared to companding, when the number of useful subcarriers is the same. Thus, we can conclude Hermitian symmetry and clipping are suitable for satellite communication systems using OFDM/FM scheme.
Keyword (in Japanese) (See Japanese page) 
(in English) OFDM / FM / Quadrature Modulation / Hermitian symmetry / clipping / companding / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 436, SAT2013-58, pp. 47-52, Feb. 2014.
Paper # SAT2013-58 
Date of Issue 2014-02-13 (SAT) 
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 SAT2013-58

Conference Information
Committee SAT SANE  
Conference Date 2014-02-20 - 2014-02-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Hotel Kamefuku (Yamaguchi) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Satellite application and general 
Paper Information
Registration To SAT 
Conference Code 2014-02-SAT-SANE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A study on applying OFDM/FM scheme to satellite communication systems 
Sub Title (in English)  
Keyword(1) OFDM  
Keyword(2) FM  
Keyword(3) Quadrature Modulation  
Keyword(4) Hermitian symmetry  
Keyword(5) clipping  
Keyword(6) companding  
Keyword(7)  
Keyword(8)  
1st Author's Name Keisuke Fukami  
1st Author's Affiliation University of the Ryukyus (Univ. of Ryukyu)
2nd Author's Name Masato Saito  
2nd Author's Affiliation University of the Ryukyus (Univ. of Ryukyu)
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Speaker Author-1 
Date Time 2014-02-21 09:00:00 
Presentation Time 25 minutes 
Registration for SAT 
Paper # SAT2013-58 
Volume (vol) vol.113 
Number (no) no.436 
Page pp.47-52 
#Pages 6 
Date of Issue 2014-02-13 (SAT) 

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