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Paper Abstract and Keywords
Presentation 2017-07-13 16:00
A Study on MIMO Systems with Antenna Pattern Modulation Technique
Masato Saito (Ryukyu Univ.) WBS2017-17 MICT2017-19
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we propose an antenna pattern modulation (APM) to exploit path diversity in Multiple-Input Multiple-Output (MIMO) receivers without increasing the antenna size.
In APM, antenna patterns are changed or modulated by periodic functions of time.
As periodic functions, we assume the sum of multiple spreading code sequences used in direct-sequence spread spectrum (DS/SS) systems or code division multiple access (CDMA) systems.
By DS/SS modulation of received signals, the signals can be mapped into the code domain of used code sequences.
Each signal component of a code sequence can be extracted from the antenna output by correlating operation.
The component is available to maximize diversity gain by multiplying appropriate weight with the component and combining the weighted signals.
We introduce antenna pattern matrix whose elements are coefficients of code sequences used in APM.
By using the matrix, we can derive the channel capacity of MIMO systems with APM based receiver as the equivalent form of that of the conventional MIMO systems.
Numerical results show that the channel capacity of the proposed MIMO system can be increased by the number of arrival paths.
Therefore, the proposed systems can exploit path diversity.
However, if the variations of antenna pattern coefficients are poor, the capacity can be decreased. Thus, it can be found that the channel capacity can be limited by the distribution of the coefficients.
Keyword (in Japanese) (See Japanese page) 
(in English) Antenna pattern modulation / MIMO / Direct-Sequence Spread Spectrum / Path diversity / Massive MIMO / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 122, WBS2017-17, pp. 51-56, July 2017.
Paper # WBS2017-17 
Date of Issue 2017-07-06 (WBS, MICT) 
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 WBS2017-17 MICT2017-19

Conference Information
Committee WBS MICT  
Conference Date 2017-07-13 - 2017-07-14 
Place (in Japanese) (See Japanese page) 
Place (in English) ACT CITY 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Poster Session, Wideband System, Healthcare and Medical Information Communication Technologies, etc. 
Paper Information
Registration To WBS 
Conference Code 2017-07-WBS-MICT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on MIMO Systems with Antenna Pattern Modulation Technique 
Sub Title (in English)  
Keyword(1) Antenna pattern modulation  
Keyword(2) MIMO  
Keyword(3) Direct-Sequence Spread Spectrum  
Keyword(4) Path diversity  
Keyword(5) Massive MIMO  
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1st Author's Name Masato Saito  
1st Author's Affiliation University of the Ryukyus (Ryukyu Univ.)
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Speaker Author-1 
Date Time 2017-07-13 16:00:00 
Presentation Time 25 minutes 
Registration for WBS 
Paper # WBS2017-17, MICT2017-19 
Volume (vol) vol.117 
Number (no) no.122(WBS), no.123(MICT) 
Page pp.51-56 
#Pages 6 
Date of Issue 2017-07-06 (WBS, MICT) 

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