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Paper Abstract and Keywords
Presentation 2020-06-24 15:45
Interleaver-Linked Receiver Beamforming with Transmitter Channel Equalization in TDD-IDMA-Based Random Access
Yuto Muroki (Tokyo Univ. of Science), Yoshihisa KIshiyama (NTT DOCOMO), Kenichi Higuchi (Tokyo Univ. of Science) RCS2020-29
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a transmission/reception protocol that combines our previously reported interleaver-linked receiver beamforming (BF) method with the transmitter channel equalization for time division duplex (TDD)-interleave division multiple access (IDMA)-based random access. While the interleaver-linked receiver BF method makes channel estimation at each receiver antenna unnecessary, if the number of sets of (interleaver, preamble, receiver BF vector), M, is not large enough, the prepared receiver BF vectors will not match the user channel sufficiently and the transmission performance will degrade. A major factor limiting M is the number of orthogonal preambles for channel estimation. When the cyclic-shifted Zadoff-Chu (ZC) sequences are used for generating orthogonal preambles, the cyclic shift width Δ must be larger than the multipath delay spread in order to separately detect the received multipaths from different user in the channel estimation and user detection processes. In the proposed method, by combining the above method with the transmitter channel equalization, the frequency selectivity of the effective channel including the transmitter channel equalization is reduced, in other words, the delay spread of the effective channel is shorteded. This enables to increase M by reducing Δ and improve the accuracy in receiver BF in the interleaver-linked receiver BF method. Based on computer simulations, we compare several transmitter channel equalization schemes in the proposed method and show the performance enhancement by using the proposed method quantitatively.
Keyword (in Japanese) (See Japanese page) 
(in English) IDMA / random access / mMTC / TDD / beamforming / transmitter channel equalization / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 74, RCS2020-29, pp. 37-42, June 2020.
Paper # RCS2020-29 
Date of Issue 2020-06-17 (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 RCS2020-29

Conference Information
Committee RCS  
Conference Date 2020-06-24 - 2020-06-26 
Place (in Japanese) (See Japanese page) 
Place (in English) 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 2020-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Interleaver-Linked Receiver Beamforming with Transmitter Channel Equalization in TDD-IDMA-Based Random Access 
Sub Title (in English)  
Keyword(1) IDMA  
Keyword(2) random access  
Keyword(3) mMTC  
Keyword(4) TDD  
Keyword(5) beamforming  
Keyword(6) transmitter channel equalization  
1st Author's Name Yuto Muroki  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Yoshihisa KIshiyama  
2nd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
3rd Author's Name Kenichi Higuchi  
3rd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
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Date Time 2020-06-24 15:45:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2020-29 
Volume (vol) IEICE-120 
Number (no) no.74 
Page pp.37-42 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2020-06-17 

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