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Paper Abstract and Keywords
Presentation 2014-10-27 13:25
IQ Imbalance and Carrier Frequency Offset Compensation Schemes using TFI-OFDM
Hikaru Oka, Chang-Jun Ahn, Tatsuya Omori, Ken-ya Hashimoto (Chiba Univ.) SRW2014-29
Abstract (in Japanese) (See Japanese page) 
(in English) A direct-conversion receiver (DCR) can reduce the power consumption and cost. However, a DCR in Orthogonal frequency division multiplexing (OFDM) systems suffer from IQ imbalance and Carrier Frequency Offset (CFO). Until this time, many algorithms are proposed to compensate IQ imbalance and CFO in OFDM. However, it is insufficient for the joint IQ imbalance and CFO estimation. On the other hand, time-frequency interferometry-OFDM (TFI-OFDM) system has been proposed to achieve an accurate channel identification property with small number of pilot symbols. In this paper, we focus on the channel identification property of TFI-OFDM and propose the novel IQ imbalance and CFO estimation schemes. In the proposed system, by using the feature of the TFI pilot symbols, we can identify an IQ imbalance in the presence of CFO, and the influence of the noise power can be mitigated by subcarrier selection. Moreover, by using autocorrelation of the TFI pilot symbols, we can estimate CFO after IQ imbalance estimation. From the simulation results, the proposed scheme can estimate IQ imbalance and CFO and compensate without a significant degradation of the BER performance.
Keyword (in Japanese) (See Japanese page) 
(in English) OFDM / DCR / IQ imbalance / CFO / TFI-OFDM / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 279, SRW2014-29, pp. 25-30, Oct. 2014.
Paper # SRW2014-29 
Date of Issue 2014-10-20 (SRW) 
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)
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Conference Information
Committee SRW  
Conference Date 2014-10-27 - 2014-10-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Chiba University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network,MAC,sensor,etc. 
Paper Information
Registration To SRW 
Conference Code 2014-10-SRW 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) IQ Imbalance and Carrier Frequency Offset Compensation Schemes using TFI-OFDM 
Sub Title (in English)  
Keyword(1) OFDM  
Keyword(2) DCR  
Keyword(3) IQ imbalance  
Keyword(4) CFO  
Keyword(5) TFI-OFDM  
1st Author's Name Hikaru Oka  
1st Author's Affiliation Chiba University (Chiba Univ.)
2nd Author's Name Chang-Jun Ahn  
2nd Author's Affiliation Chiba University (Chiba Univ.)
3rd Author's Name Tatsuya Omori  
3rd Author's Affiliation Chiba University (Chiba Univ.)
4th Author's Name Ken-ya Hashimoto  
4th Author's Affiliation Chiba University (Chiba Univ.)
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Date Time 2014-10-27 13:25:00 
Presentation Time 25 
Registration for SRW 
Paper # IEICE-SRW2014-29 
Volume (vol) IEICE-114 
Number (no) no.279 
Page pp.25-30 
#Pages IEICE-6 
Date of Issue IEICE-SRW-2014-10-20 

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