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) |
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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 |
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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 |
4 |
Date of Issue |
2015-02-12 (BCT) |
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