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Paper Abstract and Keywords
Presentation 2015-02-19 15:30
A study on log-likelihood ratio setting for superposed multicarrier transmission
Yohei Shibata, Tomoaki Ohtsuki (Keio Univ.), Jun Mashino, Takatoshi Sugiyama (NTT)
Abstract (in Japanese) (See Japanese page) 
(in English) Superposed multicarrier transmission scheme is known to improve frequency utilization efficiency where several wireless systems share spectrum. On superposed band, log likelihood ratio (LLR) cannot be set correctly because of interference, which results in BER degradation. To suppress the effect of interference, forward error correction (FEC) metric masking is proposed. In this technique, LLRs that correspond to superposed band is set to zero, because received bits that correspond to superposed band is unreliable. This scheme requires superposed band detection and does not consider channel estimation error.
We proposed an iterative esimation technique for undesired signal power. Although, this scheme does not require superposed detection beforehand, due to the estimation error of undesired signal power, BER degradation is a problem. In this paper, we propose an estimation technique for undesired signal power to calculate LLR correctly. This scheme estimates superposed
band within 1 packet and using the information about superposed band, undesired signal power is estimated using pilot symbols.
Simulation results show that as the number of pilot symbols increases, BER performs better than the scheme with iterative estimation of undesired signal power and gets closer to the BER when the estimation of undesired signal power is perfect.
Keyword (in Japanese) (See Japanese page) 
(in English) Superposed multicarrier transmission / LLR / Interference detection / / / / /  
Reference Info. ITE Tech. Rep., vol. 39, no. 6, BCT2015-29, pp. 17-20, Feb. 2015.
Paper # BCT2015-29 
Date of Issue 2015-02-12 (BCT) 
ISSN Print edition: ISSN 1342-6893    Online edition: ISSN 2424-1970
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Conference Information
Committee BCT IEEE-BT  
Conference Date 2015-02-19 - 2015-02-20 
Place (in Japanese) (See Japanese page) 
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Paper Information
Registration To BCT 
Conference Code 2015-02-BCT-BT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A study on log-likelihood ratio setting for superposed multicarrier transmission 
Sub Title (in English)  
Keyword(1) Superposed multicarrier transmission  
Keyword(2) LLR  
Keyword(3) Interference detection  
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1st Author's Name Yohei Shibata  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Tomoaki Ohtsuki  
2nd Author's Affiliation Keio University (Keio Univ.)
3rd Author's Name Jun Mashino  
3rd Author's Affiliation Nippon Telegragh and Telephone Corporation (NTT)
4th Author's Name Takatoshi Sugiyama  
4th Author's Affiliation Nippon Telegragh and Telephone Corporation (NTT)
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Speaker Author-1 
Date Time 2015-02-19 15:30:00 
Presentation Time 25 minutes 
Registration for BCT 
Paper # BCT2015-29 
Volume (vol) vol.39 
Number (no) no.6 
Page pp.17-20 
#Pages
Date of Issue 2015-02-12 (BCT) 


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