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Paper Abstract and Keywords
Presentation 2017-11-08 10:50
Effects of Channel Covariance Estimation Error on Joint Maximum A Posteriori Estimation of Channel and Interference Power for OFDM Transmission
Masahiro Kudo, Tomoaki Ohtsuki (Keio Univ.) RCS2017-208
Abstract (in Japanese) (See Japanese page) 
(in English) Superposed multicarrier transmission has been proposed as a technique to improve frequency utilization efficiency.
In this scheme, it is possible to narrow the total required bandwidth by sharing a part of the frequency band of each communication signal.
However, since it is affected by interference from the communication signal sharing the same frequency bands, its performance deteriorates.
To reduce the influence of interference, an error correction code is effective, but it is necessary to get information about interference signal (power, position).
We propose the scheme using the joint maximum a posteriori estimation of channel and interference power.
Although the scheme achieves excellent estimation accuracy, channel covariance is necessary for estimation.
Conventionally, we assumed that channel covariance is the known information.
In this paper, we evaluate the influence of the channel covariance estimation error with using the scheme which is the joint maximum a posteriori estimation of channel and interference signal power.
In the estimation of the channel covariance, we derive from using the theoretical formula based on the estimated value of the channel.
When we derive three estimation values (channel, interference signal power, channel covariance), the equation to estimate them is an implicit function.
So we estimate iteratively and improve accuracy.
Through computer simulation, we compare the effect on channel and interference signal power estimation accuracy with known case.
Keyword (in Japanese) (See Japanese page) 
(in English) OFDM / LLR / MAP / channel estimation / covariance / interference signal power estimation / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 284, RCS2017-208, pp. 23-28, Nov. 2017.
Paper # RCS2017-208 
Date of Issue 2017-11-01 (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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF RCS2017-208

Conference Information
Committee AP RCS  
Conference Date 2017-11-08 - 2017-11-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Fukuoka University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Adaptive Antenna, Equalization, Interference Canceler, MIMO, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2017-11-AP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Effects of Channel Covariance Estimation Error on Joint Maximum A Posteriori Estimation of Channel and Interference Power for OFDM Transmission 
Sub Title (in English)  
Keyword(1) OFDM  
Keyword(2) LLR  
Keyword(3) MAP  
Keyword(4) channel estimation  
Keyword(5) covariance  
Keyword(6) interference signal power estimation  
1st Author's Name Masahiro Kudo  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Tomoaki Ohtsuki  
2nd Author's Affiliation Keio University (Keio Univ.)
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Date Time 2017-11-08 10:50:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2017-208 
Volume (vol) IEICE-117 
Number (no) no.284 
Page pp.23-28 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2017-11-01 

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