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Paper Abstract and Keywords
Presentation 2023-06-15 15:35
Randomized DFT Spread Spectrally Efficient Frequency Division Multiplexing and Low-Complexity Expectation-Propagation Detection
Kazuki Komatsu (Toyohashi Univ. of Tech.), Shun Kojima (Univ. of Tokyo), Hideyuki Uehara (Toyohashi Univ. of Tech.) RCS2023-59
Abstract (in Japanese) (See Japanese page) 
(in English) Spectrally-efficient frequency division multiplexing (SEFDM) can transmit the same amount of data in a narrower bandwidth than orthogonal frequency division multiplexing (OFDM) by narrowing the frequency spacing of each subcarrier.
In this report, we consider the modulation matrix of the SEFDM from the viewpoint of singular value decomposition and propose a randomized discrete Fourier transform spread SEFDM (RDFT-s-SEFDM).
In the RDFT-s-SEFDM, the orthogonality of each subcarrier is maintained, while the information on the subcarriers is spread non-orthogonally to the compressed band by the randomized DFT matrix.
We also propose a low-complexity demodulation method using the expectation propagation by using the characteristics of the modulation matrix of the RDFT-s-SEFDM.
It is shown that the path diversity effect can be obtained in the frequency selective Rayleigh fading channel, and that the demodulation is sufficiently possible even when the bandwidth is reduced to 62.5%, when QPSK is used for the subcarrier modulation.
Keyword (in Japanese) (See Japanese page) 
(in English) Spectrally Efficient Frequency Division Multiplexing / Interference Cancellation / Expectation Propagation / DFT Spread / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 76, RCS2023-59, pp. 182-187, June 2023.
Paper # RCS2023-59 
Date of Issue 2023-06-07 (RCS) 
ISSN 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 RCS2023-59

Conference Information
Committee RCS  
Conference Date 2023-06-14 - 2023-06-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido University, and online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2023-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Randomized DFT Spread Spectrally Efficient Frequency Division Multiplexing and Low-Complexity Expectation-Propagation Detection 
Sub Title (in English)  
Keyword(1) Spectrally Efficient Frequency Division Multiplexing  
Keyword(2) Interference Cancellation  
Keyword(3) Expectation Propagation  
Keyword(4) DFT Spread  
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1st Author's Name Kazuki Komatsu  
1st Author's Affiliation Toyohashi University of Technology (Toyohashi Univ. of Tech.)
2nd Author's Name Shun Kojima  
2nd Author's Affiliation The University of Tokyo (Univ. of Tokyo)
3rd Author's Name Hideyuki Uehara  
3rd Author's Affiliation Toyohashi University of Technology (Toyohashi Univ. of Tech.)
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Speaker Author-1 
Date Time 2023-06-15 15:35:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2023-59 
Volume (vol) vol.123 
Number (no) no.76 
Page pp.182-187 
#Pages 6 
Date of Issue 2023-06-07 (RCS) 

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