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Paper Abstract and Keywords
Presentation 2020-06-24 15:20
Interleaver-Linked Receiver Beamforming for IDMA-Based Random Access in TDD System
Yotaro Murakami (Tokyo Univ. of Science), Yoshihisa Kishiyama (NTT DOCOMO), Kenichi Higuchi (Tokyo Univ. of Science) RCS2020-28
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a novel interleaver-linked receiver beamforming in time division duplex (TDD)-interleave division multiple access (IDMA)-based random access. When the number of receiver antennas at the base station is large in massive multiple-input multiple-output (MIMO) scenario, the accuracy in channel estimation per receiver antenna at the base station receiver is degraded due to the limited received signal power per antenna from the user terminal. This results in the degradation in receiver beamforming (BF) or antenna diversity combining and user detection. In the proposed method, a unique receiver BF vector applied at the base station is linked to each of the M interleavers prepared by the system. The user terminal selects an appropriate pair of receiver BF vector and interleaver in advance based on the channel estimation result in downlink assuming the channel reciprocity in TDD system. Therefore, the per-receiver antenna channel estimation for receiver BF is not necessary in the proposed method. Based on computer simulations, we show that both proposed methods greatly improve the accuracy of user detection and channel estimation and reduce the error rate compared to the conventional method that performs channel estimation at each antenna in a massive MIMO environment.
Keyword (in Japanese) (See Japanese page) 
(in English) IDMA / random access / mMTC / TDD / Zadoff-Chu sequence / user detection / channel estimation /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 74, RCS2020-28, pp. 31-36, June 2020.
Paper # RCS2020-28 
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 RCS2020-28

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 for IDMA-Based Random Access in TDD System 
Sub Title (in English)  
Keyword(1) IDMA  
Keyword(2) random access  
Keyword(3) mMTC  
Keyword(4) TDD  
Keyword(5) Zadoff-Chu sequence  
Keyword(6) user detection  
Keyword(7) channel estimation  
1st Author's Name Yotaro Murakami  
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 15:20:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2020-28 
Volume (vol) IEICE-120 
Number (no) no.74 
Page pp.31-36 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2020-06-17 

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