Information: Join today and make your research activities more affordable! Technical workshop participation fees and annual registration fees are available at member rates.
Notice: [Important] Announcement of Changes to Registration Fee Payment and Manuscript Upload Procedures for IEICE Technical Meetings
IEICE Technical Committee Submission System
Conference Paper's Information		 Online Proceedings
[Sign in]
Tech. Rep. Archives
 Go Top Page Go Previous   [Japanese] / [English] 

Paper Abstract and Keywords
Presentation 2026-01-27 13:55
Analysis of M-ary Modulated Signal Reception Characteristics in 1-bit ADC Array Antenna under LOS/NLOS Environments Using Mutual Information
Teppei Oyama (Nit, Oita/TUAT), Kenta Umebayashi (TUAT) SR2025-76
Abstract (in Japanese) (See Japanese page) 
(in English) This paper investigates the reception performance of 16QAM signals using an array antenna equipped with 1-bit analog-to-digital converters (ADCs). The evaluation is based on mutual information under line-of-sight (LOS) and non–line-of-sight (NLOS) environments. Unlike previous studies that assumed NLOS environment, this work considers LOS environments and analyzes the impact of signal arrival direction. Results show that, even at high SNR, mutual information does not reach the theoretical maximum of 4 bits for 16QAM, saturating at approximately 3.5 bits. Moreover, in LOS scenarios, performance can degrade to 2 bits for certain arrival directions, revealing a strong direction dependency. Conventional approaches such as threshold adjustment and constellation redesign fail to fully resolve this issue. To overcome this limitation, we propose introducing random phase shifts to each antenna element, which effectively eliminates direction dependency. Furthermore, combining phase randomization with threshold adjustment achieves performance close to the theoretical limit of 4 bits regardless of arrival direction.
Keyword (in Japanese) (See Japanese page) 
(in English) 1-bit ADC / Array antenna / Mutual information / 16QAM / LOS/NLOS / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 336, SR2025-76, pp. 61-66, Jan. 2026.
Paper # SR2025-76 
Date of Issue 2026-01-19 (SR) 
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 SR2025-76

Conference Information
Committee SR  
Conference Date 2026-01-26 - 2026-01-28 
Place (in Japanese) (See Japanese page) 
Place (in English) Yamagata Terrsa 
Topics (in Japanese) (See Japanese page) 
Topics (in English) AI/machine learning, IoT, Distributed networking, general topics 
Paper Information
Registration To SR 
Conference Code 2026-01-SR 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Analysis of M-ary Modulated Signal Reception Characteristics in 1-bit ADC Array Antenna under LOS/NLOS Environments Using Mutual Information 
Sub Title (in English)  
Keyword(1) 1-bit ADC  
Keyword(2) Array antenna  
Keyword(3) Mutual information  
Keyword(4) 16QAM  
Keyword(5) LOS/NLOS  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Teppei Oyama  
1st Author's Affiliation National Institute of Technology, Oita College/Tokyo University of Agriculture and Technology (Nit, Oita/TUAT)
2nd Author's Name Kenta Umebayashi  
2nd Author's Affiliation Tokyo University of Agriculture and Technology (TUAT)
3rd Author's Name  
3rd Author's Affiliation ()
4th Author's Name  
4th Author's Affiliation ()
5th Author's Name  
5th Author's Affiliation ()
6th Author's Name  
6th Author's Affiliation ()
7th Author's Name  
7th Author's Affiliation ()
8th Author's Name  
8th Author's Affiliation ()
9th Author's Name  
9th Author's Affiliation ()
10th Author's Name  
10th Author's Affiliation ()
11th Author's Name  
11th Author's Affiliation ()
12th Author's Name  
12th Author's Affiliation ()
13th Author's Name  
13th Author's Affiliation ()
14th Author's Name  
14th Author's Affiliation ()
15th Author's Name  
15th Author's Affiliation ()
16th Author's Name  
16th Author's Affiliation ()
17th Author's Name  
17th Author's Affiliation ()
18th Author's Name  
18th Author's Affiliation ()
19th Author's Name  
19th Author's Affiliation ()
20th Author's Name  
20th Author's Affiliation ()
21st Author's Name  
21st Author's Affiliation ()
22nd Author's Name  
22nd Author's Affiliation ()
23rd Author's Name  
23rd Author's Affiliation ()
24th Author's Name  
24th Author's Affiliation ()
25th Author's Name  
25th Author's Affiliation ()
26th Author's Name / /
26th Author's Affiliation ()
()
27th Author's Name / /
27th Author's Affiliation ()
()
28th Author's Name / /
28th Author's Affiliation ()
()
29th Author's Name / /
29th Author's Affiliation ()
()
30th Author's Name / /
30th Author's Affiliation ()
()
31st Author's Name / /
31st Author's Affiliation ()
()
32nd Author's Name / /
32nd Author's Affiliation ()
()
33rd Author's Name / /
33rd Author's Affiliation ()
()
34th Author's Name / /
34th Author's Affiliation ()
()
35th Author's Name / /
35th Author's Affiliation ()
()
36th Author's Name / /
36th Author's Affiliation ()
()
Speaker Author-1 
Date Time 2026-01-27 13:55:00 
Presentation Time 25 minutes 
Registration for SR 
Paper # SR2025-76 
Volume (vol) vol.125 
Number (no) no.336 
Page pp.61-66 
#Pages 6 
Date of Issue 2026-01-19 (SR) 

[Return to Top Page]

[Return to IEICE Web Page]
The Institute of Electronics, Information and Communication Engineers (IEICE), Japan